Needle Roller Bearings - Ntn-snr.com

For New Technology Network 

R 

corporation 

Needle Roller Bearings 

&

CONTENTS

Technical Data 

A-001058 

Needle roller and cage assemblies 

B-003020 


for connecting rod bearings 

B-021028 

Drawn cup needle roller bearings 

B-029052 

Machined-ring needle roller bearings 

B-053096 

Machined-ring needle roller bearings, 

separable 

B-097114 

Inner rings 

B-115132 

Clearance-adjustable needle roller bearings 

B-133138 

Complex bearings 

B-139160 

Roller followers 

B-161173 

Cam followers 

B-174204 

Thrust roller bearings 

B-205220 

Components 

Needle rollers / Snap rings / Seals 

B-221234 

Linear bearings 

B-235254 

One-way clutches 

B-255259 

Bottom roller bearings for textile machinery 

Tension pulleys for textile machinery 

B-260266 

Appendixes 

C-001020

Warranty 

NTN warrants, to the original purchaser only, that the delivered product which is the subject of this sale (a) 

will conform to drawings and specifications mutually established in writing as applicable to the contract, and (b) 

be free from defects in material or fabrication. The duration of this warranty is one year from date of delivery. 

If the buyer discovers within this period a failure of the product to conform to drawings or specifications, or a 

defect in material or fabrication, it must promptly notify NTN in writing. In no event shall such notification be 

received by NTN later than 13 months from the date of delivery. Within a reasonable time after such 

notification, NTN will, at its option, (a) correct any failure of the product to conform to drawings, specifications 

or any defect in material or workmanship, with either replacement or repair of the product, or (b) refund, in part 

or in whole, the purchase price. Such replacement and repair, excluding charges for labor, is at NTN's 

expense. All warranty service will be performed at service centers designated by NTN. These remedies are 

the purchaser's exclusive remedies for breach of warranty. 

NTN does not warrant (a) any product, components or parts not manufactured by NTN, (b) defects caused 

by failure to provide a suitable installation environment for the product, (c) damage caused by use of the 

product for purposes other than those for which it was designed, (d) damage caused by disasters such as fire, 

flood, wind, and lightning, (e) damage caused by unauthorized attachments or modification, (f) damage during 

shipment, or (g) any other abuse or misuse by the purchaser. 

THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, 

INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 

FOR A PARTICULAR PURPOSE. 

In no case shall NTN be liable for any special, incidental, or consequential damages based upon breach of 

warranty, breach of contract, negligence, strict tort, or any other legal theory,and in no case shall total liability 

of NTN exceed the purchase price of the part upon which such liability is based. Such damages include, but 

are not limited to, loss of profits, loss of savings or revenue, loss of use of the product or any associated 

equipment, cost of capital, cost of any substitute equipment, facilities or services, downtime, the claims of third 

parties including customers, and injury to property. Some states do not allow limits on warranties, or on 

remedies for breach in certain transactions. In such states, the limits in this paragraph and in paragraph (2) 

shall apply to the extent allowable under case law and statutes in such states. 

Any action for breach of warranty or any other legal theory must be commenced within 15 months following 

delivery of the goods. 

Unless modified in a writing signed by both parties, this agreement is understood to be the complete and 

exclusive agreement between the parties, superceding all prior agreements, oral or written, and all other 

communications between the parties relating to the subject matter of this agreement. No employee of NTN or 

any other party is authorized to make any warranty in addition to those made in this agreement. 

This agreement allocates the risks of product failure between NTN and the purchaser. This allocation is 

recognized by both parties and is reflected in the price of the goods. The purchaser acknowledges that it has 

read this agreement, understands it, and is bound by its terms. 

© NTN Corporation. 2002 

Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does not 

assume any liability to any company or person for errors or omissions.

Needle Roller Bearings

TECHNICAL DATA CONTENTS 

1. Classification and Characteristics 

of Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A- 4 

2. Load Rating and Life ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-14 

2. 1 Bearing life ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-14 

2. 2 Basic rated life and basic dynamic load rating ⋯⋯⋯⋯A-14 

2. 3 Bearing-applied machine and requisite life of bearing ⋯A-14 

2. 4 Bearing life using adjusted life rating factors ⋯⋯⋯⋯⋯A-15 

2.4.1 Reliability adjustment factor1⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-15 

2.4.2 Bearing characteristic adjustment factor2 ⋯⋯⋯⋯⋯⋯A-15 

2.4.3 Operating condition adjustment factor3⋯⋯⋯⋯⋯⋯⋯A-16 

2. 5 Affect on basic dynamic load rating by the hardness of 

raceway ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-16 

2. 6 Life of bearing with oscillating motion ⋯⋯⋯⋯⋯⋯⋯⋯A-16 

2. 7 Life of bearing with linear motion ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-17 

2. 8 Various factors influencing bearing life ⋯⋯⋯⋯⋯⋯⋯A-17 

2. 9 Mounting deviation and crowning ⋯⋯⋯⋯⋯⋯⋯⋯⋯A-18 

2.10 Relation of bearing life to radial internal clearance, 

surface roughness and surface hardness ⋯⋯⋯⋯⋯⋯A-19 

2.11 Basic static load rating ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-19 

2.12 Allowable static bearing load ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-19 

3. Calculation of Bearing Loads⋯⋯⋯⋯⋯⋯⋯⋯⋯A-20 

3.1 Loads acting on shafting ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-20 

3.1.1 Loads acting on gears ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-20 

3.1.2 Loads acting on chain and belt shafts ⋯⋯⋯⋯⋯⋯⋯⋯A-22 

3.1.3 Load factor ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-22 

3.2 Load distribution to bearing⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-23 

3.3 Mean load ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-25 

4. Bearing Accuracy ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-25 

5. Bearing Clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-30 

5.1 Radial clearance in bearing⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-30 

5.2 Running clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-30 

5.2.1 Setting up running clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-30 

5.2.2 Calculation of running clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-30 

5.3 Bearing fit and bearing radial clearance ⋯⋯⋯⋯⋯⋯⋯A-31 

6. Bearing Fits ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-32 

6.1 Clamping allowance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-32 

6.2 Necessity of proper fit ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-32 

6.3 Fit selection ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-32 

6.4 Recommended fits ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-33 

6.5 Calculation of clamping allowance ⋯⋯⋯⋯⋯⋯⋯⋯⋯A-35 

7. Shaft and Housing Design ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-36 

7.1 Design of bearing mount ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-36 

7.2 Bearing fitting dimensions ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-38 

7.3 Shaft and housing accuracy ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-39 

7.4 Raceway surface accuracy ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-39 

7.5 Raceway material and its hardness ⋯⋯⋯⋯⋯⋯⋯⋯⋯A-39 

7.6 Allowable bearing misalignment ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-39 

8. Lubrication ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-40 

8.1 Grease lubrication ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-40 

8.1.1 Types and properties of grease ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-40 

8.1.2 Base oil ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-40 

8.1.3 Thickening agent ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-40 

8.1.4 Additives ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-41 

8.1.5 Consistency⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-41 

8.1.6 Grease mixing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-41 

8.1.7 Grease fill amount ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-41 

8.1.8 Grease replenishing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-42 

8.2 Oil lubrication ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-42 

8.2.1 Lubrication method ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-42 

8.2.2 Lubrication oils⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-43 

8.2.3 Oiling rate ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-44 

8.2.4 Lubrication oil replacement cycle⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-44 

9. Seals ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-45 

9.1 Non-contact seal, contact seal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-45 

9.2 Duplex seal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-47 

9.3 Clearance setting⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-47 

9.4 NTN seals ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-47 

9.5 Seal materials and operating temperature ⋯⋯⋯⋯⋯⋯A-47 

9.6 Seal type and allowable speed ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-47 

9.7 Shaft surface hardness ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-48 

10. Bearing Handling ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-49 

10.1 Bearing storage ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-49 

10.2 Bearing installation ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-49 

10.3 Post-installation running test ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-50 

10.4 Bearing disassembly⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-50 

10.5 Required press-fit and pull-out forces ⋯⋯⋯⋯⋯⋯⋯A-51 

10.6 Washing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-51 

11. Technical Data ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-52 

11.1 HL bearing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-52 

11.1.1 Basic concept of HL bearing ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-52 

11.1.2 HL surface ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-52 

11.1.3 Application examples⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-52 

11.2 Bearings with solid grease ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-53 

11.2.1 Features of bearings with solid grease ⋯⋯⋯⋯⋯⋯⋯A-53 

11.2.2 Precautions in use of bearings with solid grease ⋯⋯⋯A-53 

11.2.3 Application examples of bearings with solid grease ⋯⋯A-53 

11.3 Calculation examples ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-54 

11.3.1 Shrinkage of drawn-cup needle roller bearing and 

post-installation clearance⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-54 

11.3.2 Track load capacity of cam follower/roller follower⋯⋯⋯A-55 

11.3.3 Outer ring strength⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-56 

11.3.4 Stud strength of cam follower ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯A-56 

12. Bearing Type Codes and Auxiliary Codes ⋯A-57 

A-2

DIMENSIONAL DATA CONTENTS 

Needle Roller and Cage Assemblies ⋯⋯⋯⋯⋯⋯B- 3 

K, KT2, KS, KZW, KMJ, KMJS, KJS, KVS ⋯⋯⋯⋯⋯B- 6 

PCJ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-18 

Needle Roller and Cage Assemblies for 

Connecting Rod ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-21 

PK,KBK ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-25 

Drawn Cup Needle Roller Bearings ⋯⋯⋯⋯⋯⋯⋯B-29 

HK, HKZWD, HMK, HMKZWD, BK, BKZWD ⋯⋯⋯⋯B-36 

HKL, HMKL, HKLL, HMKLL, BKL ⋯⋯⋯⋯⋯⋯⋯B-44 

DCL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-48 

HCK ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-52 

Machined-Ring Needle Roller Bearings ⋯⋯⋯⋯⋯B-53 

RNA48, RNA49, RNA59, RNA69, NK ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-58 

NA48, NA49, NA59, NA69, NK+IR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-66 

MR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-80 

MR+MI ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-86 

RNA49L, RNA49LL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-94 

NA49L,NA49LL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-95 

Machine-ring Needle Roller Bearings, 

Separable Type ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-97 

RNAO, RNAOZW ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-100 

NAO, NAOZW ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-108 

Inner ring ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-115 

IR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-117 

MI ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-129 

Clearance-Adjustable Needle Roller Bearings B-133 

RNA49S ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-136 

NA49S ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-137 

Complex Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-139 

NKX, NKXZ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-144 

NKX+IR, NKXZ+IR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-146 

NKXR, NKXRZ ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-148 

NKXR+IR, NKXRZ+IR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-150 

NKIA⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-152 

NKIB⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-154 

AXN ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-156 

ARN ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-158 

Roller Followers ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-161 

NA22LL, RNA22LL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-166 

NATR, NATRLL, NATV, NATVLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯B-168 

NACVX, NACVXLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-170 

NUTR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-172 

NUTW ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-173 

Cam Followers ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-174 

KR, KRLL, KRV, KRVLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-182 

KRT, KRTX, KRTLL, KRTXLL⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-186 

KRVT, KRVTX, KRVTLL, KRVTXLL ⋯⋯⋯⋯⋯⋯⋯B-188 

KRU, KRULL, KRVU, KRVULL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-190 

NUKR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-194 

NUKRT, NUKRTX ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-196 

NUKRU, NUKRUX⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-198 

CR, CRLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-200 

CRVX, CRVXLL⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-202 

Thrust Roller Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-205 

AXK11, AS11, WS811, GS811 ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-210 

811, 812, 893, K811, K812, K893, WS811,WS812, WS893, 

GS811, GS812, GS893 ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-214 

Components / Needle rollers ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-221 

A, F ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-224 

Components / Snap rings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-226 

WR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-227 

BR ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-229 

Components / Seals ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-232 

G, GD ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-233 

Machined-Ring and Drawn-cup Linear Ball 

Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-235 

KLM, KLMLL, KLMS, KLMSLL, KLMP, KLMPLL B-241 

KH, KHLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-243 

Stroking Linear Ball Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯B-244 

KD, KDLL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-246 

Linear Flat Roller Bearings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-248 

FF, FFZW ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-250 

BF, RF ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-251 

Linear Roller Bearings⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-252 

RLM ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-253 

One-way Clutches ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-255 

HF⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-258 

HFL ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-259 

Bottom Roller Bearings for Textile Machinery B-260 

FRIS (Series A) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-261 

FRIS (Series B) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-263 

FR⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-264 

Tension Pulleys for Textile Machinery ⋯⋯⋯⋯⋯B-265 

JPUS, JPUS+JFS ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯B-266 

Appendix⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C- 1 

A-3

Classification and Characteristics of Bearings 

NTN 

1. Classification and Characteristics Bearings 

Needle roller bearings have relatively smaller diameter 

cylindrical rolling elements whose length is much larger 

than their diameter. 

Compared with other types of rolling bearings, needle 

roller bearings have a small cross-sectional height and 

significant load-bearing capacity and rigidity relative to 

their volume. Also, because the inertial force action on 

them is limited, they are ideal choice for oscillating 

motion. Needle roller bearings contribute to compact and 

lightweight machine designs. They serve also as a ready 

replacement for sliding bearings. 

NTN offers the following types of needle roller bearings. 

Needle roller and cage assembly 

This assembly, a major component of a 

needle roller bearing, comprises needle rollers 

and a cage to support the rollers. 

¡Using the shaft and housing as raceway 

surfaces reduces the cross-sectional 

height: it is equal to the diameter of the 

needle roller bearing. 

¡This structure eliminating the outer and 

inner rings allows the bearing to be fitted 

more easily. 

¡The assembly is available in both single-row 

and double-row configurations. 

¡As long as the tolerance limit of the shaft 

and housing is satisfied, the radial internal 

clearance can be made adjustable. 

Needle roller and cage assembly for connecting rods 

This assembly, a major component of a needle roller bearing, comprising needle rollers and a cage to support the 

rollers, is used typically for connecting rods in reciprocating compressors and small- and mid-sized internal combustion 

engines such as those for motorbikes, light cars, outboard motors and versatile engines. This assembly features such a 

cage that is specifically optimized for severe operating conditions involving high impact loads, complicated motions, highspeed 

revolution and/or high operating temperatures. 

Needle roller and cage assembly for large end 

¡This assembly, subjected to a cranking motion with a 

simultaneous action of the rolling elements’ rotation 

and revolution, must be light but have a high rigidity, 

and must have a precise dimension of the outer 

diameter of the cage so that the guiding system can 

keep an appropriate gap. 

¡The cage is made of high-tensile special steel with a 

surface hardening treatment. 

¡The guiding system employed is an outer diameter 

guiding system. 

¡The cage that may be subjected to poor lubrication 

can be protected with a surface treatment using a 

non-ferrous metal. 

¡For applications with a one-piece structure of crank 

shaft, the cage of split type is also available. 

A-4


NTN 

Needle roller and cage assembly for small end 

¡Strong impact load acts on this bearing and it 

oscillates at high speed. Therefore, the cage bore 

surface is finished with high precision so as to secure 

lightweight, high rigidity and proper guide clearance. 

¡The cage is made of high tensile special steel and its 

surface is hardened ideally. 

¡The cage is of bore guide type and the guide surface 

is designed as long as possible to thereby reduce the 

surface pressure. 

¡The roller length is designed to the possible 

maximum value against the connecting width and a 

number of small-size needle rollers are fitted in the 

cage to minimize the contact pressure. 

Drawn-cup needle roller bearing 

This bearing comprises an outer ring and needle 

rollers, which were both drawn from special thin steel 

plate by precision deep drawing, and a cage intended 

to guide precisely the needle rollers. 

¡This bearing is the type of the lowest section height, 

of the rolling bearings with outer ring, best-suited to 

space-saving design. 

¡A hardened and ground shaft or inner ring (IR Series) 

is used as the raceway. 

¡This bearing needs no axial locking due to easy 

installation and press-fit in the housing. 

¡The close end type to close shaft end is available in 

addition to the open end type. 

¡Furthermore, the type with seal fitted in at single side 

or double sides is also available. 

¡The standard type comprises a needle roller and 

cage assembly. In addition to this type, special type 

comprising full complement rollers is available at 

option. 


This bearing type comprises a machined outer ring 

and machined needle rollers, and a cage to guide 

properly the needle rollers. 

In the case of this bearing, the cage or the needle 

rollers are guided by the ribs of the outer ring or the 

face ring. Hence, this bearing is non-separable type. In 

addition, the type with no inner ring is also available for 

enabling a shaft to be used as the raceway surface. (Of 

course, the type with inner ring is available.) 

¡Selectively available for both of the metric system 

and the inch system. 

¡Best-suited to space-saving design due to its low 

section height, then having the large load capacity. 

¡High rigidity and high bearing accuracy due to its 

machined (precut) outer ring 

¡can be used with a housing made of light metal, etc. 

due to its outer ring of high rigidity. 

¡Outer ring with lubrication hole and lubrication groove 

¡Single row and double row types available. 

¡The type with seal fitted in at single side or double 

sides is also available. 

A-5


NTN 

Machined-ring needle roller bearing separable type 


and machined needle rollers, and a cage to guide and 

retain properly the needle rollers. And the needle roller 

and cage assembly is separable from the outer ring. In 

addition to the standard type, the type with no inner ring 

is also available for enabling a shaft to be used as 

direct raceway surface. (Of course, the type with inner 

ring available, too.) 

¡Easy to install, the needle roller and cage 

assembly, the outer ring, and the inner ring can be 

mounted independently from each other. 

¡Any optional radial internal clearance is selectable by 

combining the individual independent components. 

¡Best-suited to space-saving design due to its low 


¡High rigidity and high bearing accuracy due to its 

machined (precut) outer ring. 

¡Can be used with a housing made of light metal, etc. 

due to its outer ring of high rigidity. 

¡Single row and double row types available. And the 

outer ring of the double row bearing is provided with 

lubrication hole and lubrication groove. 

Inner ring 

For the needle roller bearings, usually a shaft is used 

as the raceway surface, but this inner ring is used 

where the shaft surface can not be machined to the 

specific hardness and roughness. This inner ring is 

suited to space-saving design due to its low section 

height. This is made of high carbon chrome bearing 

steel, finished by high precision grinding after heattreated. 

¡Can also be used as a bush. 

¡Selectively available for both of the metric system 

and the inch system. 

¡The type with lubrication hole at the raceway center 

also available. 

Clearance-adjustable needle roller bearing 


and machined needle rollers, and a cage to guide and 

retain properly the needle rollers, but the needle roller 

and cage assembly is non-separable from the outer 

ring. In addition to the standard type, the type with no 

inner ring is also available for enabling a shaft to be 

used as direct raceway surface. (Of course, the type 

with inner ring available, too.) 

¡The raceway diameter of the outer ring is shrunk by 

pressing the outer ring in axial direction, which then 

enables to reduce the roller set bore diameter 

correspondingly. 

¡Radial clearance is finely adjustable by adjusting 

axial pressing load and thereby changing shrinkage 

of the outer ring raceway diameter. 

¡This bearing is applied to the work spindle of a 

machine tool and other similar portions which require 

the high speed rotational accuracy of JIS Grade-4. 

A-6


NTN 

Thrust roller bearing 

This bearing comprises needle rollers or cylindrical 

rollers, a cage to guide and retain properly the rollers, 

and disc-shaped rolling bearing ring. This is a bearing 

capable of supporting one-way axial load. Furthermore, 

this bearing can be used without rolling bearing ring, 

where the heat-treated and ground bearing mount 

surface can be used as the raceway surface. 

¡Best-suited to space-saving design due to its small 


¡Available are AS type rolling bearing ring made of 

thin steel plate with hardened surface and WS type 

and GS type machined rings. 

Complex needle roller bearings Needle roller bearing with thrust bearing 

This complex bearing comprises a radial needle roller 

bearing for supporting radial load and a thrust bearing 

for supporting axial load which are assembled integrally. 

Both thrust ball bearing type and thrust axial roller 

bearing type are available as the bearing intended to 

support axial load. 

¡The thrust bearing with dust-proof cover is also 

available, which has a good effect in preventing 

scattering of oil and grease and invasion of external 

dust, etc. 

Complex needle roller bearings 

Needle roller bearing with angular ball bearing, needle roller bearing with three-point contact ball bearing 

This complex bearing comprises a radial needle roller 

bearing for supporting radial load, a ball bearing for 

supporting comparatively small axial load and a 

machined inner ring which are all assembled integrally. 

Both angular ball bearing and three-point contact ball 

bearing are available as the ball bearing intended to 

support axial load. 

¡The complex needle roller bearings (NKIA 

Series)using an angular ball bearing as the thrust 

bearing can support one-directional angular load. 

¡The complex needle roller bearings (NKIB Series) 

using a three-point contact ball bearing as the thrust 

bearing can support double-directional axial load and 

furthermore its position in axial direction can be fixed, 

too. 

Needle roller bearing with double thrust roller bearing 

This is a complex bearing wherein a thrust needle 

roller bearing or a thrust cylindrical roller bearing 

intended to support axial load is configured at the double 

sides of a radial needle roller bearing for supporting 

radial load. 

¡Can support large axial load acting thereon from the 

double sides. 

¡Used as the bearing (precision bearing) for supporting 

the ball screw of a machine tool. 

A-7


NTN 

The track roller bearing is a needle roller bearing with thick outer ring, which is applied to cam roller, guide roller, 

eccentric roller and rocker arm. 

The track roller bearings are mainly categorized into a yoke type track roller bearing (roller follower) and a stud type 

track roller bearing (cam follower). Various types of the roller follower and the cam follower are available as described 

hereunder. 

Roller follower Without axial guide 

This roller follower is a bearing designed for 

rotation of the outer ring wherein a needle roller and 

cage assembly and a synthetic rubber seal 

reinforced with steel plate are assembled in the thickwalled 

outer ring. 

¡The outer ring, the needle roller and cage 

assembly, and the rubber seal are non-separable 

from each other. 

¡The outer ring is thick-walled type so that it is 

resistible to high load and impact load. 

¡The shaft must be provided with a thrust washer 

and a flange, because of the outer ring with no 

ribs (or face ring) and no axial guide function. 

¡The outer surface is available in both spherical 

(crowning) profile and cylindrical profile. 

¡The bearing with spherical outer ring is effective in 

damping bias load which is caused by deviation in 

installing. 

¡The bearing with cylindrical outer ring is suitable to 

the cases of large load and low-hardness track 

surface,due to its large area of contact with the 

mating track surface. 

Roller follower With axial guide 

This roller follower is a bearing designed for 

rotation of the outer ring wherein a needle roller and 

cage assembly, an inner ring, and a face ring are 

assembled in the thick-walled outer ring. 

This bearing uses needle rollers as its rolling 

element and furthermore classified into bearing with 

cage and full complement roller bearing without 

cage. The outer ring is guided axially by a face ring 

which is press-fitted in the inner ring. 

¡The outer ring is thick-walled type so that it is 

resistible to high load and impact load. 

¡The outer surface is available in both spherical 


¡The bearing with spherical outer ring is effective in 

damping bias load which is caused by deviation in 

installing. 

¡The bearing with cylindrical outer ring is suitable to 

the cases of large load and low-hardness track 

surface,due to its large area of contact with the 

mating track surface. 

¡This bearing is easier to handle because it needs 

no mounting of a guide (thrust washer, etc.) on the 

shaft unlike other types without axial guide 

(RNA22, NA22). 

A-8


NTN 

Cam follower Needle roller type 

This is a bearing designed for rotation of the outer ring in 

which a needle roller and cage assembly and a stud in lieu of 

inner ring are fitted in the thick-walled outer ring. The stud is 

so threaded as to be mounted easily. This cam follower 

(bearing) uses needle rollers as its rolling element and it is 

further classified into one bearing type with cage and another 

full complement roller bearing type without cage. 

¡The bearing type with cage is suitable to comparatively high 

speed running because its rollers are guided by the cage. 

¡The full complement roller type enabling to use more needle 

rollers than the type with cage has large load capacity. 

¡The outer surface is available in both spherical (crowning) 

profile and cylindrical profile. 

¡This cam follower (bearing) is selectively available for both 

of the metric system and the inch system. 

¡Furthermore, the seal built-in type is also available. 

¡The stud is of either recessed head type allowing use of a 

screwdriver or hexagon socket head type so as to be 

mounted and adjusted easily. 

Cam follower Cylindrical roller type 

This is a full complement roller bearing designed for rotation 

of the outer ring in which double-row cylindrical rollers and a 

stud in lieu of inner ring are fitted in the thick-walled outer ring. 

The stud is so threaded as to be mounted easily. 

¡This cam follower (bearing) has the radial /axial load 

capacity larger than the needle roller type. 

¡A steel plate is press-fitted in the outer ring and a labyrinth 

seal is formed between the face ring and the outer ring. 

¡The outer surface is available in both spherical (crowing) 

profile and cylindrical profile. 


screwdriver or of hexagon socket head type so as to be 


Cam follower Eccentric type 

This is a cam follower (bearing) wherein the studs of the 

needle roller type and cylindrical roller type prescribed above 

were made eccentric, which can then be adjusted by making 

eccentric the outer ring relative position against the raceway. 

¡Load distribution is easily adjustable in configuring two or 

more cam followers in linear form. 

¡Preload can be applied by adjustment of load distribution. 

¡Alignment is possible even when the mounting hole is not 

processed in high accuracy. 

¡The outer surface is selectively available in both spherical 



screwdriver or hexagon socket head type so as to be 


A-9


NTN 

The components described hereunder are for needle roller bearing. 

Needle rollers 

The needle rollers with flat end face and round end face 

are standard. These rollers are made of high-carbon 

chrome bearing steel, surface-finished by grinding and 

buffing after heat-treated. The standard accuracy of these 

rollers is "Precision Grade". 

¡A-Inter-diameter tolerance of the needle rollers is 2mm 

maximum. 

¡The roller type with crowned rolling surface is also 

available, which can damp edge load. 

¡These needle rollers are supplied as an individual for 

applications (pin, shaft) other than rolling element. 

Snap rings 

These are special-purposed rings used for axially 

positioning or guiding the inner and outer rings or the 

needle roller and cage assembly in needle roller bearing. 

The ring material is a hard steel wire rod and chemical 

conversion treatment is applied to its surface so as to 

provide high rigidity. 

¡Two types are available for shaft and housing use. 

¡The section height is lowered flexibly according to the 

dimensions of needle roller bearings. In addition, 

manufacture of these rings is available up to the 

possible minimum dimensional range. 

¡For the axial guide it is recommended to provide a 

spacer between the cage and the snap ring. 

Seals 

This is a special-purposed seal which was designed so 

as to match the small section height of needle roller 

bearings. 

¡G-type seal with one lip and GD-type seal with two lips 

are selectively available on application. 

¡These seals comprising steel ring and synthetic rubber 

can be used at the operating temperature ranging from 

-25 to 120˚C, but continuous use thereof is subject to 

100˚C and less. 

¡These seals act to prevent invasion of external foreign 

matter and over-consumption of lubrication grease. 

¡The radial section height of each seal is designed so as 

to match the drawn-cup needle roller bearings. Hence, 

these seals require no additional finishing of the 

housing. This facilitates handling. 

A-10


NTN 

This catalogue describes the following ones of linear motion bearings. 

Linear ball bearing Machined ring type 

This is a high precision bearing which comprises a 

machined outer ring and face ring, steel balls and a 

synthetic resin cage for retaining the balls and rolls 

on a shaft, maintaining the endless linear motion. 

¡Standard type, clearance-adjustable type and 

open type are selectively available on application. 

¡Some bearings of these types are provided with a 

synthetic rubber seal at single side or double 

sides to prevent invasion of foreign matter therein. 

¡The steel balls are guided precisely by the cage so 

that stable linear motion can be achieved with less 

friction resistance. 

¡No rotational motion is available. 

Linear ball bearing Drawn cup type 

This is a high precision bearing which comprises 

an outer ring drawn from thin special steel plate by 

precision deep drawing, steel balls and a synthetic 

resin cage for retaining the balls and rolls on a shaft, 

maintaining the endless linear motion. 

¡The outer ring made of thin steel plate enables to 

make less the section height and to design the 

linear motion system of compact structure. 

¡Easy to install This bearing is press-fitted in the 

housing so that it requires no axial fixing. 

¡No rotational motion available. 

¡Some bearings of this type are provided with a 

synthetic rubber seal at double sides to prevent 

invasion of foreign matter therein. 

Linear ball bearing Stroking type 

This bearing comprises a machined outer ring and 

face ring, steel balls and a cage for retaining the 

balls and reciprocates finitely on a shaft as well as 

rotates on a shaft. The outer ring is provided with a 

snap ring as the cage stopper at its double sides 

and, furthermore, a wavy spring is provided between 

the snap ring and the cage to damp impact acting the 

cage and to thereby prevent wear of the cage. 

¡Some bearings of this stroking type are provided 

with a synthetic rubber seal at its double sides to 

prevent invasion of foreign matter therein. 

¡The outer ring is so grooved that snap ring can be 

fitted and fixed easily. 

A-11


NTN 

Linear flat roller 

This is a flat roller bearing which comprises a flat 

cage and needle rollers and reciprocates on a flat 

raceway in linear direction by motion of its linear 

movable components. 

¡The molded polyamide resin cage and pressformed 

steel plate cage are selectively available 

on application. 

¡FF type molded resin cage Several cages can 

be used with them jointed with each other in 

parallel configuration. 

¡The press-formed steel plate cage Cage to 

cage jointing is unavailable, but it can be supplied 

at any optional length. 

¡In the case of double-row resin cage, it is provided 

with an elastic joint at its center part so it can be 

reformed at any optional angle by dipping it in an 

oil of 70 to 90˚C and can be mounted on a Veegrooved 

surface. 

Linear roller bearing 

This bearing comprising cylindrical rollers capable 

of turning internally around the track frame moves 

endlessly on a flat surface in linear direction. 

¡Low friction factor due to the case assemblies 

preventing neighboring roller from touching. 

¡High load rating due to use of cylindrical rollers. 

A-12


NTN 

This catalogue describes the following products, too. 

One-way clutch 

This one-way clutch comprises an outer ring 

drawn from thin special steel plate by precision deep 

drawing, spring, needle rollers and cage and can 

transmit a torque in only one way. 

¡Less friction torque against over-running, great 

transmission torque for small section height. 

¡Various types are available as follows; one-way 

clutch with bearing built therein to support radial 

load, one-way clutch with outer ring plated for 

improvement of erosion resistance, one-way 

clutch integrated with gear, pulley, etc. 

¡HF type and HFL type can be locked axially by 

being only press-fitted in the housing. 

¡These one-way clutches use the outer ring drawn 

by precision deep drawing, which needs the 

housing with wall thickness of a specified value or 

more. 

¡HF type is subjected to configuration of a radial 

ball bearing at its double ends. (On the other 

hand, HFL type is complete with radial bearings 

built-in at its double sides.) 

Bottom roller bearing For textile machinery 

This is a grease pre-filled needle roller bearing 

intended to support the bottom rollers. The spherical 

outer surface of the outer ring can allow bottom roller 

mounting error to some extent. On the other hand, 

the inner ring is provided with ribs at its double ends. 

A clearance between the outer ring ribs and the inner 

ring ribs is kept less and, in addition, the outer 

surface of each inner ring rib is knurled so as not to 

allow easy invasion of mist, etc. into the bearing. 

Tension Pulley For Textile Machinery 

This pulley is used to guide the tapered portion or 

belt of the spindle drive unit in each of a fine spinning 

machine, a rough spinning machine, a pre-twisting 

machine, etc. as well as to apply tension to them. 

The pulley drawn from steel plate by precision deep 

drawing is press-fitted on the outer ring of shaft 

bearing instead of inner ring. 

A-13

Load Rating and Life 

NTN 

2. Load Rating and Life 

2.1 Bearing life 

Even when bearings are in running under normal 

condition, the raceway surface and the surfaces of the 

rolling elements inevitably subjected to repetitive 

compression stress result in flaking due to fatigue of the 

raceway an element materials and can resist no longer to 

further running even under normal condition. "Bearing life" 

is defined as the total cumulative bearing revolutions until 

flaking occurs thus on the raceway surface or the element 

rolling surfaces. 

Further use of bearings becomes unavailable, caused 

by various defects such as seizure, wear, crack, chipping, 

chattering, rusting, etc. in addition to the flaking 

phenomenon stated above. However, these phenomena 

should be deemed as defects of bearing itself and, 

therefore, be discriminated from bearing life. And the 

defect causes are such as incorrect selection of bearing, 

improper mounting, improper lubrication, imperfect 

sealing, etc. Hence, bearing trouble can be avoided by 

removing the said causes. 

2.2 Basic rated life and basic dynamic load rating 

Even when a group of same bearings have been in 

running under the same condition, considerably great 

variation is found among the individual bearing lives. This 

comes from variation in material fatigue itself. Hence, the 

basic rated life defined below considering statistically this 

variation in material fatigue is applied as the bearing life. 

The basic rated life means the substantial total 

cumulative revolutions of the individual bearings 90% 

(90% reliability) of which can revolve without resulting in 

flaking due to rolling fatigue when a group of same 

bearings have been put individually in continuous running 

under same condition. When bearings have been in 

running in constant revolution, the basic rated life is 

expressed as the total cumulative revolutions of the 

individual bearings. 

On the other hand, the basic dynamic load rating 

represents the load capacity of rolling bearing, then 

meaning a constant load under which the basic rated life 

of 1,000,000 revolutions is achieved. This constant load 

of radial bearing is expressed with net radial load, while 

that of thrust bearing is expressed with net axial load. 

The bearing dimensions table in this catalogue 

describes the respective basic dynamic load ratings of the 

bearings that were manufactured using NTN’s standard 

materials and manufacturing processes in current use. 

For the respective basic rated lives of the bearings 

manufactured using the special materials and special 

manufacturing processes, feel free to contact NTN for 

inquiry. 

The relationship among the basic rated life, the basic 

dynamic load rating and the axial load can be expressed 

in formula (2.1). 

Basic Rated Life specified in ISO 281. 

L 10 C p ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2.1) 

P 

where, 

p= 10/3 For roller bearing 

p= 3. For ball bearings 

L10 : Basic rated life (10 6 revolutions) 

C : Basic dynamic rated load, (N) (kgf) 

(radial bearings: Cr, thrust bearings: Ca) 

P : Bearing load, (N) (kgf) 

(radial bearings: Pr, thrust bearings: Pa) 

Furthermore, the basic rated life cab be determined by 

formula (2.2), where it is expressed in the operating 

hours. 

L10h 500 f h p (2.2) 

C 

f h f n (2.3) 

P 

f n 

where, 

33.3 1p (2.4) 

n 

L10h : Basic rated life, h 

fh : Life factor 

fn : Speed factor 

n : Rotational speed, r/ min 

The formula (2.2) can also expressed as formula (2.5). 

L 10h 106 

C p (2.5) 

60 n P 

Considering the life of either one, of several bearings 

installed in a machine or an equipment, until it breaks 

down due to rolling fatigue as the total bearing life as a 

whole, it can be determined by formula (2.6). 

L 

1 

(2.6) 

1 1 1 1e 

L1 e L2 e Ln e 

where, 

e = 9/8 ⋯⋯⋯For roller bearings 

e = 10/9 ⋯⋯⋯For ball bearings 

L : Total basic rated life of bwaring as a whole, h 

L1 L2 Ln : Individual basic rated life of bearings, 

1, 2,n, h 

2.3 Bearing-applied machines and requisite life 

In selecting a bearing, it is essential to set up the 

requisite life of the bearing under the intended operating 

conditions, but the requisite life is mainly determined by 

the durability period and in-running reliability required for 

a machine to which the bearing is applied. In general, the 

requisite lifetime as a guideline is as shown in Table 2.1. 

The fatigue life of bearing is an important factor to 

decide the bearing size to be applied. In addition to this 

factor, however, the strengths and rigidities of shaft and 

housing must be taken into consideration. 

A-14


NTN 

Table 2.1 Operating conditions and requisite lifetime 

Operating conditions 

Lifetime L10h 

Tools and devices requiring no all-time running 

Ex) Door switcher, etc. 

Machines which are operated for a short time or intermittently and do not cause comparatively great affect on others 

even if they shut down incidentally due to trouble. 

Ex.) Hand tools, heavy material handling hoist in a machining shop, general hand-operated machines, agricultural machines, 

crane in a casting shop, material automatic feeder, home appliances, etc. 

Machines which are not put in continuous running but required to run very precisely 

Ex.) Auxiliary machines in a power station, conveyor in a flow process, elevator, general cargo handling crane, 

machine tool of low frequency in use, etc. 

Machines which are operated for 8 hours per day but not put in all-time continuous running 

Ex.) Power generator in a factory, general geared unit, etc. 

Machines which are operated for 8 hours per day 

Ex.) General machines in a machining shop, crane in all-time operation. 

Machines which are put in 24-hour continuous running 

Ex.) Separator, compressor, pump, main shaft, table roller of rolling mill, conveyor roller, winding engine in a mine, 

driving motor in a factory, etc. 

Machines which are put in 24-hour continuous running and, in addition, are not allowed absolutely trouble shutdown. 

Ex.) Cellulose manufacturing machine, paper making machine, power station, drainage pump in a mine, 

urban city water related equipment, etc. 

500 

4 000 8 000 

8 000 14 000 

14 000 20 000 

20 000 30 000 

50 000 60 000 

100 000 200 000 

2.4 Bearing life using the adjusted life rating factor 

The basic bearing life rating (90% reliability) can be 

calculated using the formulas prescribed in Subsection 

2.2, but on occasion the bearing life of over-90% reliability 

must be determined on application. Also, the bearing life 

can be further extended by using a specially improved 

bearing material and special manufacturing 

process/technique. Furthermore, it was clarified by the 

elastohydrodynamic lubrication theory that the bearing life 

would be influenced by bearing operating conditions 

(lubrication, temperature, speed, etc.) 

The bearing life considering the above factors can be 

determined by formula (2.7) using "Life Adjustment 

Factor" specified in ISO 281. 

where, 

Lna a1a2a3CP p (2.7) 

Lna : Adjusted life rating 10 6 revolutions 

a1 : Reliability adjustment factor 

a2 : Bearing material adjustment factor 

a3 : Operating condition adjustment factor 

2.4.1 Reliability adjustment factor a1 

The values of reliability adjustment factor a1 for 90% 

and higher reliability are as shown in Table 2.2. 

2.4.2 Life adjustment factor for bearing material a2 

Where bearing material used is special type and quality 

and manufactured in the special process, the life-related 

bearing characteristics are inevitably variable depending 

on the specialties of the material. In such a case, the 

bearing life is adjusted using the life adjustment factor for 

bearing material a2. 

The basic dynamic load ratings described in "Bearing 

Dimensions Table" are subject to use of the standard 

Table 2.2 Values of reliability adjustment factor a1 

Reliability % Ln Reliability adjustment factor a1 

90 

95 

96 

97 

98 

99 

L10 

L5 

L4 

L3 

L2 

L1 

1.00 

0.62 

0.53 

0.44 

0.33 

0.21 

materials and manufacturing processes / techniques 

being used in NTN, and usually a2=1 rating is used. 

Furthermore, a2>1 is eventually applied to the bearings 

manufactured using the specially improved material and 

manufacturing process / technique. In such a case, feel 

free to contact NTN for further instruction. 

Where bearings made of high carbon chrome bearing 

steel are used at 120˚C and over throughout a long term, 

the dimension of the normal heat-treated bearing varies 

significantly and, therefore, dimension-stabilizing heattreatment 

(TS treatment) must be done to the bearings 

according to the maximum operating temperature. 

However, this dimension-stabilizing treatment causes the 

bearing hardness to reduce, finally an inverse affect on 

the bearing life. To avoid it, the bearing life is adjusted 

(compensated) by multiplying the life rating by the life 

adjustment factor for bearing material a2 shown in Table 

2.3. 

Table 2.3 Values of life adjustment factor for bearing material a2 for 

dimension-stabilizing heat-treated (TS-treated) bearings 

Code 

TS2- 

TS3- 

TS4- 

Maximum operating 

temperature 

160˚C 

200˚C 

250˚C 

Life adjustment factor 

for bearing material a2 

1.00 

0.73 

0.48 

A-15


NTN 

2.4.3 Life adjustment factor for operating conditions a3 

The life adjustment factor for operating conditions a3 is 

used for adjustment(compensation) of the bearing life, 

where the lubricated bearing condition gets worse and the 

lubricant deteriorates or foreign matter is included in the 

bearing, caused by the rotational speed, temperature rise, 

etc. of the bearing in running. 

Generally the life adjustment factor in the case of good 

lubricated bearing condition is a3=1 and, particularly 

where the lubricated bearing condition is good and other 

factors for the bearing are normal, a3>1 can be applied to 

adjustment of the bearing life. However, a3


NTN 

When the oscillation angle 2 is very small, difficulty in 

forming an oil film on the contact surface of rolling ring to 

rolling element could result in fretting corrosion. 

In the case of inner ring oscillation, the critical 

oscillation angle is expressed in formula (2.9). 

360˚ dp 

Critical oscillation angle ⋯⋯(2.9) 

Z dpDa cos 

Where, 

Z : Number of rolling elements (per row) 

dp : Pitch circle diameter (PCD) of rolling element 

Dp: Rolling element diameter 

e : Contact angle 

(In the case of outer ring oscillation, the right side 

denominator is dp + Da cos .) 

2.7 Life of bearing with linear motion 

In the case of bearings with linear motion such as linear 

ball bearing, linear flat roller bearing, etc., the relationship 

among axial travel distance, bearing load and load rating 

can be expressed in formulas (2.10), (2.11). 

When the rolling elements are balls; 

L 50 Cr 3 

Pr 

⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2.10) 

When the rolling elements are rollers; 

L 100 Cr 10/3 

⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2.11) 

Pr 

where, 

L Load rating km 

CrBasic dynamic load rating N (kgf) 

PrBearing load N (kgf) 

Fig.2.4 shows the relationship of Cr/Pr to L. 

Furthermore, when the travel motion cycle and travel 

distance remain unchanged, the lifetime of bearing can 

be determined by formulas (2.12), (2.13). 

When the rolling elements are balls; 

Lh 50103 Cr 3 (2.12) 

60S Pr 

When the rolling elements are rollers; 

Lh 100103 Cr 10/3 

(2.13) 

60S Pr 

where, 

Lh: Travel life h 

S : Travel distance per minute m/min 

S =2Ln 

L : Stroke length m 

n : Stroke cycle N (kgf) 

2.8 Various factors influencing bearing life 

Bearing life is influenced by not only bearing load and 

rotational speed but also various factors such as 

lubricating condition, internal clearance, surface 

roughness and hardness of raceway, heat-treated 

structure, misalignment, etc. In using bearings, therefore, 

these influence factors must be taken into full 

consideration. Table 2.4 shows the bearing operating 

conditions as a guideline. (For the detail refer to 

Commentary" described in Bearing Dimensions Table 

every each bearing type.) 

Table 2.4 Guideline of the bearing operating conditions 

Allowable rotational speed (r/min) 

Surface roughness of raceway 

Surface hardness of raceway 

Misalignment 

Radial internal clearance 

See Dimensions Table 

within 0.2a 

HRC58 to 64 

Note: Refer to Subsection 7.5 for 

various materials and heat-treated 

hardness thereof. 

1/2000 or less (for radial bearing) 

Ordinary level (C2, C3, C4) 

Cr /Pr 

10 

8 

6 

5 

4 

3 

2 

Ball bearing 

Roller bearing 

0.05 0.1 0.2 0.3 0.4 0.6 0.8 1 2 3 4 6 8 10 20 30 40 60 100 

L10 3 km 

Fig. 2.4 Life of bearing with axial motion 

A-17


NTN 

2.9 Fitting misalignment and crowning 

Generally it is well known that stress concentration at 

edge portion (so called, edge load) arising from fitting 

misalignment would result in rapid reduction of bearing 

lifetime. "Crowning" is adopted as a countermeasure 

against such rapid reduction of bearing lifetime. In that 

case, however, unless it is designed properly this 

crowning would cause the effective contact length of roller 

to reduce, which could then lead to shorter life of bearing. 

It is therefore necessary to calculate a proper crowning 

value though depending on the extent of fitting 

misalignment. 

And load condition. For reference, Figs.2.5 to 2.7 

show the examples of contact surface pressure analysis 

by a computer. 

As seen from Figs.2.5 to 2.7 (Examples of contact 

surface pressure analysis), the rollers with no crowning 

have high edge surface pressure, while the rollers with 

crowning restrain the edge surface pressure lower in the 

range of specific allowable fitting misalignment. Fig.2.8 

shows the relationship of allowable fitting misalignment to 

bearing lifetime. (example of computer analysis) It is 

possible to see from this Figure how the bearing lifetime 

is influenced by fitting misalignment. 

Contact surface pressure 


Effective length of roller 

Rollers with no crowning and 

free from fitting misalignment 


Rollers with crowning and 

fitting misalignment 

Fig. 2.5 

Fig. 2.7 


Life ratioLL10 

1.0 


Rollers with no crowning and 

free from fitting misalignment 

Fig. 2.6 

0 

0 1.0 2.0 

Fitting misalignment10 -3 

Fig. 2.8 Relationship of fitting misalignment to bearing lifetime 

A-18


NTN 

2.10 Radial internal clearance, surface 

roughness and surface hardness, and 

bearing life 

The relationship of radial internal clearance to bearing 

life is as shown in Fig. 2.9 and the relationship of surface 

roughness to bearing life as shown in Fig.2.10. 

It is possible to see from these Figures how the bearing 

life is influenced by each factor. 

1.0 

"Basic static load rating" is defined as such a constant 

static load that results in permanent deformation of the 

said limit value, which is then expressed in net radial load 

for radial bearings and in net axial load for thrust 

bearings. 

Regarding this load value, each table of bearing 

dimensions describes it in the Cor, field for radial bearings 

and in Coa field for thrust bearings respectively. 

When the load defined above acts on a bearing, 

contact stress at the contact center of rolling element to 

raceway, which are subjected to maximum load, reaches 

the following value. 

For roller bearing ⋯⋯⋯4000MPa (408kgf/mm 2 ) 

For ball bearing ⋯⋯⋯4200MPa (428kgf/mm 2 ) 

Fig. 2.9 Relationship of radial internal clearance to bearing life 

L10 life10 4 

Life ratioLL 

3000 

2000 

1000 

0 

0 0 20 40 

(1.0) 

1.0 

0.25 

Radial internal clearance10 -3 

(0.85) 

2.0 

0.5 

(0.37) 

(0.18) 

3.0 

0.75 

4.0 

1.0 

5.0 

1.25 

(0.09) 

6.0 

1.5 

The sum of surface roughnesses of test specimens in relative 

position before testing R max m ( ) showing Ra 

2.12 Allowable static bearing load 

The basic static load rating prescribed in Subsection 

2.11 is generally deemed as an allowable static bearing 

limit load, but in some cases this allowable limit load is 

set up larger than the basic static load rating and in some 

other cases it is set up smaller, according to the 

requirements for revolving smoothness and friction. 

Generally this allowable limit load is decided 

considering the safety factor So in the following formula 

(2.14) and Table 2.5. 

So CoPo(2.14) 

where, 

So : Safety factor 

Co : Basic static rated load, N (kgf) 

(For radial bearings: Cor, 

For thrust bearings: Coa) 

Po max : Maximum static bearing load, N (kgf) 

(For radial bearings: Por max, 

For thrust bearings: Coa max) 

Table 2.5 Lower limit value of safety factor S0 


Requirement for high revolving accuracy 

Roller 

bearings 

3 

Ball 

bearings 

2 

Fig. 2.10 Relationship of surface roughness to bearing life 

Requirement for ordinal revolving 

accuracy (ordinary-purposed) 

1.5 

1 

2.11 Basic static load rating 

Load acting on a bearing, when acted, results in locally 

permanent deformation of the contract surface of rolling 

elements to bearing ring. And this deformation value 

increases inevitably with the increasing load and smooth 

rotation of the bearing is interfered with by the 

deformation when it exceeded a certain limit value. 

It is known experimentally that the total permanent 

deformation value 0.0001 times as large as the rolling 

element diameter at the contact center of rolling elements 

to raceway both of which are subjected to maximum 

stress is an allowable deformation limit which does not 

interfere with smooth rotation of bearing. 

Where minor deterioration of revolving 

accuracy is allowed 

(Ex. Low speed revolution, duty load 

application, etc.) 

Remarks: 1. For the drawn-cup needle roller bearings, 3 shall be adopted 

as So lower limit value. 

2. Where vibration and shock load act on bearing, Po max shall 

be determined considering the shock load factor. 

1 

0.5 

A-19

Calculation of Bearing Loads 

NTN 

3. Calculation of Bearing Loads 

3.1 Load acting on shafts 

The loads acting on the shaft to be supported with the 

bearing must be determined for calculation of bearing 

loads. These loads include the self-weight of rotor assy, 

loads inevitably resulting from a machine in running, 

loads arising from power transmission, etc. These loads 

are mostly difficult to calculate though some of them can 

be calculated numerically and theoretically. 

The following paragraphs describe how to calculate 

the loads acting on a power transmission shaft as one of 

the main bearing applications. 

Ks 

Kt 

3.1.1 Load acting on gears 

The loads acting on gears can be divided into 

tangential load (Kt), radial load (Ks) and axial load (Ka). 

The magnitude and acting direction of each load differ 

depending on the types of gear. This paragraph 

describes how to calculate the loads acting on parallel 

shaft gears and cross shaft gears for general use. 

For calculation of the loads acting on other gears, feel 

free to contact NTN for inquiry. 

(1) Load acting on parallel shaft gear 

Figs. 3.1 to 3.3 illustrate the loads acting on spur gear 

and helical gear which are used with a parallel shaft. The 

magnitude of each load can be determined using the 

formulas (3.1) to (3.4). 

Fig. 3.1 Load acting on spur gear 

Ks Ka 

Kt 

Fig. 3.2 Load acting on helical gear 

19.110 6 HP 1.9510 6 HP 

Kt 

 

(3.1) 

Dpn 

Dpn 

KsKttan(Spur gear) 

(3.2a) 

Kt 

tan 

Kt (for helical gear) (3.2b) 

cos 

Kr 

Ks 

Kr Kt 2 Ks 2 (3.3a) 

KaKttan(for helical gear)(3.4) 

where, 

Kt Tangential load acting on gear 

(Tangential force) N (kgf) 

Ks Radial load acting on gear 

(separating force) N (kgf) 

Kr Load acting perpendicularly on gear shaft 

(composite force of tangential force and 

separating force) N (kgf) 

Ka Parallel load acting on gear shaft N (kgf) 

HPTransmission power kw 

n Rotational speed r/min 

Dp Pitch circle diameter of gear mm 

Gear pressure angle 

Gear helix angle 

Fig. 3.3 Composite radial force acting on gear 

Table 3.1 Gear factor fz 

Types of gear 

Precision ground gears 

(Pitch and profile errors of less than 0.02mm) 

Ordinary machined gears 

(Pitch and profile errors of less than 0.1mm) 

Dp 

fz 

1.051.1 

1.11.3 

Actual gear load is determined by multiplying the 

theoretical load by the gear factor described in Table 3.1, 

because vibration and shock are added to each 

theoretical load determined by the above formulas. 

A-20


NTN 

(2) Loads acting on cross shaft gears 

Figs. 3.4 and 3.5 illustrate the loads acting on straighttoo 

bevel gears and spiral bevel gears which are used 

with cross shafts. 

Table 3.2 shows how to calculate these loads. 

The load acting on straight-tooth bevel gear can be 

determined from Table 3.2, assuming the helix angle as 

=0. 

The symbols and units used in this table are as follows. 

Kt Tangential load acting on gear 

(Tangential force) N (kgf) 

Ks Radial load acting on gear 

(separating force) N (kgf) 

Ka Parallel load acting on gear shaft 

(axial load) N (kgf) 

HP Transmission power kw 

n Rotational speed r/min 

Dpm Mean pitch circle diameter mm 

Gear pressure angle 

Gear helix angle 

Pitch cone angle of gear 

In general, the relationship between the loads acting on 

pinion and pinion gear can be expressed as follows, due 

to the perpendicular intersection of two shafts. 

The separating force (Ks) acting direction and axial load 

(Ka) acting direction illustrated in Fig.3.5 are the positive 

direction respectively. On the other hand, the rotational 

direction and helix angle direction are to be defined 

viewing from the large end side of the gear. Hence, for 

the gear illustrated in Fig. 3.5 these directions are 

clockwise and to right. 

K ag 

K sg 

K tg 

K tp 

K ap 

K sp 

Fig. 3.4 Load acting on bevel gears 

K t 

KspKag (3.5) 

KapKsg (3.6) 

where, 

KspKsg Pinion and pinion gear separating force N (kgf) 

KapKagAxial load acting on pinion and pinion gear N (kgf) 

 

K s 

K a 

D pm 

2 

For spiral bevel gears, the loading direction differs 

depending on the direction of helix angle, rotational 

direction and whether the spiral bevel gear is located at 

the drive side or the driven side. 

Fig.3.5 Bevel gear diagram 

Table 3.2 Loads acting on bevel gears 

Driving gears 

Rotational 

direction 

Helix angle 

Clockwise Counter clockwise Clockwise Counter clockwise 

To right To left To left To right 

Unit N 

Tangential loadKt 

Kt 19.1106 H 

Dpmn 

 

1.9510 6 H 

Dpmn 

Drive side 

KsKt 

tan cos tansin 

cos 

KsKt 

tan cos tansin 

cos 

Separating forceKs 

Driven side 

KsKt 

tan cos tansin KsKt tan cos tansin 

cos 

cos 

Axial load Ka 

Drive side 

KaKt 

tan sin tancos KaKt tan sin tancos 

 

cos 

cos 

Driven side 

KaKt 

tan sin tan 

KaKt tan sin tancos 

cos 

cos 

A-21


NTN 

3.1.2 Loads acting on chain and belt shafts 

In the case of power transmission by a chain and a 

belt, the load acting tangentially on the sprocket or the 

pulley can be determined by formula (3.7). 

19.110 6 HP 1.9510 6 HP 

Kt 

 

(3.7) 

Dpn 

Dpn 

where, 

Kt Tangential load acting on sprocket or pulley N (kgf) 

HPTransmission power kW 

Dp Pitch circle diameter of sprocket or pulley mm 

In the case of belt driving, initial tension is applied to 

the belt so the pulley and the belt are both always 

pressed down with a proper load. 

where 

K Actual load acting on shaft N(kgf) 

Kc Theoretically calculated value N (kgf) 

fw Load factor (Table 3.4) 

Table 3.4 Load factor fw 

Extent of shock 

Nearly no shock 1.01.2 

Light shock 

Heavy shock 

fw 

1.21.5 

1.53.0 

Application 

Electrical machines, machine tools, 

measuring instruments 

Railway vehicles, automobiles, 

rolling mills, metal working machines, 

paper making machines, rubber mixing 

machines, printing machines, aircraft, 

textile machines, electrical units, 

office equipment 

Crushers, agricultural machines, 

construction machines, cranes 

Dp 

F1 

F2 

Slackening side 

Kr 

Tension side 

Fig. 3.6 Loads acting on chain/ belt 

3.2 Load distribution to bearings 

Any loads acting on shafts are distributed to the 

bearings considering static tension to be supported with 

the bearings. 

For example, the loads acting on the bearings in the 

gear shaft illustrated in Fig. 3.7 can be expressed in 

formulas (3.10) and (3.11). 

Considering this initial tension, radial load acting on the 

pulley is expressed in formula (3.8). 

In the case of chain driving, the radial load acting 

thereon can be expressed using the same formula, if 

vibration and shock are taken into consideration. 

Krf bKt (3.8) 

where, 

KrRadial load acting on sprocket or pulley N (kgf) 

f bChain/belt factor (Table 3.3) 

Table 3.3 Chain/belt factor f b 

Type of chain / belt 

Chain (single row type) 

Vee-belt 

Timing belt 

Flat belt (with tension pulley) 

Flat belt 

f b 

1.21.5 

1.52.0 

1.11.3 

2.53.0 

3.04.0 

b c Dp 

FrAKr!Kr@Ka(3.10) 

l l 2l 

a abc Dp 

FrBKr!Kr@Ka 

l l 2l 

(3.11) 

where, 

FrA Radial load acting on bearing-A N (kgf) 

FrB Radial load acting on bearing-B N (kgf) 

Kr1 Radial load acting on gear-! N (kgf) 

Ka Axial load acting on gear-! N (kgf) 

Kr2 Axial load acting on gear-! N (kgf) 

Dp Pitch circle diameter of gear-! mm 

l Bearing to bearing distance mm 

l 

Gear-! 

Gear- ! 

Kr! 

Ka 

Kr@ 

Dp 

3.1.3 Load factor 

In an actual machine, the shaft load is mostly greater 

than the theoretically calculated load due to vibration, 

shock, etc. The load acting on the shafts of a machine 

can be determined by formula (3.9). 

K fWKC 

(3.9) 

FrA 

Bearing-A 

FrB 

Bearing-B 

a 

b 

Fig. 3.7 Gear shaft 

c 

A-22


NTN 

3.3 Mean load 

The loads acting on bearings used in ordinary 

machines fluctuate mostly depending on the 

predetermined operation cycle or work plan. In such a 

case, the mean load Fm converted so the same lifetime is 

assigned to the bearings is used as the bearing load. 

(3) Load fluctuating in nearly linear form 

The mean load Fm can be determined approximately by 

formula (3.14). 

Fmin2Fmax 

Fm 

3 

(3.14) 

(1) Stepped fluctuating load 

Where bearing loads F1 , F2 ....... Fn act on and the 

rotational speed and running time are n1, n2.......nn and 

t1, t2....... tn respectively, the mean load Fm of these 

loads can be expressed in formula (3.12). 

F 

Fmax 

Fm 

Fi p ni ti 1p 

Fm (3.12) 

ni ti 

Fmin 

where: 

p103 

p3 

for roller bearing 

for ball bearing 

Fig. 3.10 Load fluctuating in linear form 

t 

F 

F1 

F2 

Fm 

(4) Sinusoidal fluctuating load 

The mean load Fm, can be determined approximately by 

formulas (3.15), (3.16). 

case of (a) Fm0.75Fmax (3.15) 

case of (b) Fm0.65Fmax (3.16) 

Fn 

n1 t1 

n2t2 

nn tn 

Fig. 3.8 Stepped fluctuating load 

F 

Fmax 

(2) Consecutive series load 

Where load is load cycle "to" and it can be expressed in 

the function F(t) of time t, the mean load can be 

expressed in formula (3.13). 

1 t0 p 

Fm Ftp dt 

(3.13) 

t0 0 

F 

Fm 

a 

t 

Fmax 

F 

Fm 

F(t) 

Fm 

b 

t 

0 to 2to t 

Fig. 3.11 Sinusoidal fluctuating load 

Fig. 3.9 Load fluctuating as a time function 

A-23

A-24

Bearing Accuracy 

NTN 

4. Bearing Accuracy 

The dimensional, profile and running accuracies of 

rolling bearings are specified in ISO Standard as 

applicable and JIS B 1514 (Accuracy of Rolling Bearings). 

"Dimensional accuracy" and "Profile accuracy" are 

the items indispensable in installing the rolling bearings on 

a shaft and in a bearing housing, and allowable bearing 

run-out in running is specified as the running accuracy. 

Dimensional accuracy: 

Dimensional accuracy means the respective allowable 

values for bore diameter, outer diameter, width or height 

(limaited to thrust bearing) and chamfering dimension. 

Profile accuracy: 

This means the allowable value for variation of each of 

bore diameter, mean bore diameter, outer diameter, 

mean outer diameter, and width or thickness of bearing 

ring (limited to thrust bearing). 

Running accuracy: 

This means the respective allowable values for radial 

run-out and axial run-out of both inner ring and outer ring, 

lateral run-out of inner ring, and outer diameter run-out of 

outer ring. 

Regarding the accuracy class of the machined ring 

needle roller bearings, class-0 is equivalent to bearings of 

the normal precision class, and precision becomes 

progressively higher as the class number becomes 

smaller; i.e. Class 6 is less precise than Class 5, which is 

less precise than Class 4, and so on. 

Bearings of Class-0 are mostly used for general 

application, while bearings of Class-5 or Class-4 are 

used, where the required running accuracies and 

revolutions are high or less friction and less fluctuation 

are required for bearings. 

Various bearing types are available for NTN needle 

roller bearings and the representative types and the 

accuracy classes applicable to them are as shown in 

Table 4.1. 

Dimensional item symbols used in the accuracy 

standard are given in Table 4.2, the radial bearing 

accuracy specified every accuracy class given in Table 

4.3, the thrust bearing accuracy specified every accuracy 

class given in Table 4.4, and the allowable values for 

chamfering dimension given in Table 4.5. 

Table 4.2 Dimensional item symbols used in applicable standards 

Classification Symbols 

Dimensional 

accuracy 

Profile 

accuracy 

Running 

accuracy 

dmp 

ds 

Dmp 

Ds 

Bs 

Cs 

Vdp 

Vdmp 

VDp 

VDmp 

VBs 

VCs 

Kia 

Kea 

Sia 

Sea 

Sd 

SD 

Symbol representation 

Dimensional tolerance for in-plane 

mean bore diameter 

Dimensional tolerance for bore diameter 

Dimensional tolerance for in-plane 

mean outer diameter 

Symbols under 

JIS B 0021 (Reference) 

Dimensional tolerance for outer diameter 

Dimensional tolerance for inner ring width 

Dimensional tolerance for outer ring width 

Variation of in-plane bore diameter Roundness 

Variation of in-plane mean bore diameter Cylindricality 

Variation of in-plane outer diameter Roundness 

Variation of in-plane mean outer diameter Cylindricality 

Variation of inner ring width Parallelism 

Variation of outer ring width Parallelism 

Radial run-out of inner ring Run-out 

Radial run-out of outer ring Run-out 

Axial run-out of inner ring 

Axial run-out of outer ring 

Lateral run-out (inner ring) Run-out 

Outer diameter run-out (outer ring) Run-out 

1) The roundness specified in JIS B 0021 is applicable to the tolerance Vdp for 

variation of radial in-plane bore diameter or nearly half of VDp. 

2) The cylindricality specified in JIS B 0021 is applicable to the tolerance Vdmp 

for in-uniformity of radial in-plane mean diameter or nearly half of VDmp. 

1 

2 

1 

2 

Table 4.1 Bearing types and corresponding accuracy classes 

Bearing type Applicable accuracy class Applicable table 

Needle roller bearing, 

Clearance-adjustable needle roller bearing 

JIS Class-0 

 

JIS Class-6 

 

JIS Class-5 

 

JIS class-4 

JIS class-4 

Table 4.3 

Table 4.3 

Complex bearing 

Radial bearing 

Thrust bearing 

JIS Class-0 

NTN Class 0 

JIS Class-6 

NTN Class 6 

JIS Class-5 

NTN Class 5 

 

NTN Class 4 

Table 4.3 

Table 4.4 

Needle roller bearing 

with double-direction 

thrust roller bearing 

Radial bearing 


 

 

 

 

JIS Class-5 

NTN Class 5 

JIS Class-4 

NTN Class 4 

Table 4.3 

Table 4.4 

Thrust roller bearing 

Roller follower/cam follower 

NTN Class 0 

JIS Class-0 

NTN Class 6 

 

NTN Class 5 

 

NTN Class 4 

 

Table 4.4 

Table 4.3 

A-25


NTN 

Table 4.3 Tolerances for radial bearings 

Table 4.3(1) Inner rings 

Nominal bore 

diameter 

d 

mm 

over 

2.5 1 

10 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

incl. 

10 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

500 

Dimensional tolerance for mean bore diameter 

∆dmp 

 

 

Class 0 Class 6 Class 5 Class 4 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

8 

8 

10 

12 

15 

20 

25 

25 

30 

35 

40 

45 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

1 2.5mm is included in this dimensional category. 

2 This table is applied to the ball bearings. 

high low high low high low high low 

7 

7 

8 

10 

12 

15 

18 

18 

22 

25 

30 

35 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

 

5 

5 

6 

8 

9 

10 

13 

13 

15 

18 

23 

 

0 

0 

0 

0 

0 

0 

0 

0 

0 

 

 

 

4 

4 

5 

6 

7 

8 

10 

10 

12 

 

 

 

Class 

0 

10 

10 

13 

15 

19 

25 

31 

31 

38 

44 

50 

56 

Variation of mean 

bore diameter 

9 

9 

10 

13 

15 

19 

23 

23 

28 

31 

38 

44 

Vdp 

Class Class 

6 5 

max 

5 

5 

6 

8 

9 

10 

13 

13 

15 

18 

23 

 

Class 

4 

4 

4 

5 

6 

7 

8 

10 

10 

12 

 

 

 

Allowable variation of 

bore diameter 

Class 

0 

6 

6 

8 

9 

11 

15 

19 

19 

23 

26 

30 

34 

Vdmp 

Class Class 

6 5 

max 

5 

5 

6 

8 

9 

11 

14 

14 

17 

19 

23 

26 

3 

3 

3 

4 

5 

5 

7 

7 

8 

9 

12 

 

Class 

4 

2 

2 

2.5 

3 

3.5 

4 

5 

5 

6 

 

 

 

Table 4.3 (2) Outer rings 

Nominal outer 

diameter 

D 

mm 

over 

incl. 

Dimensional tolerance for mean outer diameter 

∆Dmp 

 

 


high low high low high low high low 


outer diameter 

Class 

0 

VDp 

Class Class 

6 5 

max. 

Class 

4 


mean outer diameter 

Class 

0 

VDmp 

Class Class 

6 5 

max. 

Class 

4 

6 

18 

30 

3 

18 

30 

50 

0 

0 

0 

8 

9 

11 

0 

0 

0 

7 

8 

9 

0 

0 

0 

5 

6 

7 

0 

0 

0 

4 

5 

6 

10 

12 

14 

9 

10 

11 

5 

6 

7 

4 

5 

6 

6 

7 

8 

5 

6 

7 

3 

3 

4 

2 

2.5 

3 

50 

80 

120 

80 

120 

150 

0 

0 

0 

13 

15 

18 

0 

0 

0 

11 

13 

15 

0 

0 

0 

9 

10 

11 

0 

0 

0 

7 

8 

9 

16 

19 

23 

14 

16 

19 

9 

10 

11 

7 

8 

9 

10 

11 

14 

8 

10 

11 

5 

5 

6 

3.5 

4 

5 

150 

180 

250 

180 

250 

315 

0 

0 

0 

25 

30 

35 

0 

0 

0 

18 

20 

25 

0 

0 

0 

13 

15 

18 

0 

0 

0 

10 

11 

13 

31 

38 

44 

23 

25 

31 

13 

15 

18 

10 

11 

13 

19 

23 

26 

14 

15 

19 

7 

8 

9 

5 

6 

7 

315 

400 

500 

400 

500 

630 

0 

0 

0 

40 

45 

50 

0 

0 

0 

28 

33 

38 

0 

0 

0 

20 

23 

28 

0 

 

 

15 

 

 

50 

56 

63 

35 

41 

48 

20 

23 

28 

15 

 

 

30 

34 

38 

21 

25 

29 

10 

12 

14 

8 

 

 

1 6mm is included in this dimensional category. 

2 This table is applied to the ball bearings. 

A-26

A-27 


NTN 

7 

7 

8 

8 

8 

9 

10 

10 

11 

13 

15 

 

3 

3 

4 

4 

5 

5 

6 

6 

7 

 

 

 

m 

Face run-out 

Sd 

 

 

 

Axial run-out 

Sia 

 

 

7 

7 

8 

8 

8 

9 

10 

10 

13 

15 

20 

 

3 

3 

4 

4 

5 

5 

7 

7 

8 

 

 

 

2.5 

2.5 

2.5 

3 

4 

4 

5 

5 

6 

 

 

 

Allowable width deviation 

∆B 

 

 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

120 

120 

120 

120 

150 

200 

250 

250 

300 

350 

400 

450 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

 

40 

80 

120 

120 

150 

200 

250 

250 

300 

350 

400 

 

Allowable width variation 

VB 

 

 

 

15 

20 

20 

20 

25 

25 

30 

30 

30 

35 

40 

50 

15 

20 

20 

20 

25 

25 

30 

30 

30 

35 

40 

45 

5 

5 

5 

5 

6 

7 

8 

8 

10 

13 

15 

 

2 

Class 

5 

Class 

4 

max 

Class 

5 

Class 

4 

max high low high low 

Class 

0,6 

Class 

5,4 

Class 

0 

Class 

6 

Class 

5 

Class 

4 

max 

Nominal bore 

diameter 

d 

mm 

2.5 

10 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

10 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

500 

1 

Class 

0 

Class 

6 

Class 

5 

Class 

4 

10 

10 

13 

15 

20 

25 

30 

30 

40 

50 

60 

65 

6 

7 

8 

10 

10 

13 

18 

18 

20 

25 

30 

35 

4 

4 

4 

5 

5 

6 

8 

8 

10 

13 

15 

 

2.5 

2.5 

3 

4 

4 

5 

6 

6 

8 

 

 

 

Radial run-out 

Kia 

 

 

 

max over incl. 

m 

2.5 

2.5 

2.5 

3 

4 

5 

5 

7 

7 

8 

 

 

Outside surface 

inclination 

SD 

 

 

Class 

0 

Class 

6 

5 

5 

5 

6 

8 

8 

8 

10 

11 

13 

15 

18 

8 

8 

8 

8 

9 

10 

10 

11 

13 

13 

15 

18 

4 

4 

4 

4 

5 

5 

5 

7 

8 

10 

 

 

Axial run-out 

Sea 

 

 

8 

8 

8 

10 

11 

13 

14 

15 

18 

20 

23 

25 

5 

5 

5 

5 

6 

7 

8 

10 

10 

13 

 

 

Allowable width deviation 

∆Cs 

Depending on the tolerance 

of ∆Bs for d of same bearing. 

Depending on 

the applicable 

allowable 

value of VBs 

for d of same 

bearing. 

4 

Class 

5 

Class 

4 

max 

Class 

5 

Class 

4 

Class 0,6,5,4 

max 

Class 

5 

Class 

4 

max 

Allowable width variation 

VCs 

 

Nominal outer 

diameter 

D 

mm 

6 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

500 

18 

30 

50 

80 

120 

150 

180 

250 

315 

400 

500 

630 

3 

Class 

0 

Class 

6 

Class 

5 

Class 

4 

Radial run-out 

Kea 

15 

15 

20 

25 

35 

40 

45 

50 

60 

70 

80 

100 

8 

9 

10 

13 

18 

20 

23 

25 

30 

35 

40 

50 

5 

6 

7 

8 

10 

11 

13 

15 

18 

20 

23 

25 

3 

4 

5 

5 

6 

7 

8 

10 

11 

13 

 

 

max over incl.


NTN 

Table 4.4 Tolerances of thrust roller bearings 

Table 4.4 (1) Inner rings and center rings 

Nominal bore diameter 

d or d2 

over 

 

18 

30 

50 

80 

120 

180 

250 

315 

400 

500 

 

incl. 

18 

30 

50 

80 

120 

180 

250 

315 

400 

500 

630 

Allowable deviation of mean diameter 

 

 

∆dmp or ∆d2mp 

 

 

 

 

Class 0, 6, 5 

 

 

Class 4 

low high low 

high 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

8 

10 

12 

15 

20 

25 

30 

35 

40 

45 

50 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

7 

8 

10 

12 

15 

18 

22 

25 

30 

35 

40 


bore diameter 

 

Vdp or Vd2p 

 

 

Class 0, 6, 5 Class 4 

lo w 

6 

8 

9 

11 

15 

19 

23 

26 

30 

34 

38 

5 

6 

8 

9 

11 

14 

17 

19 

23 

26 

30 

10 

10 

10 

10 

15 

15 

20 

25 

30 

30 

35 

5 

5 

6 

7 

8 

9 

10 

13 

15 

18 

21 

3 

3 

3 

4 

4 

5 

5 

7 

7 

9 

11 

m 

Allowable variation of raceway thickness 

1 

 

 

 

 

Si 

 

 

 

 

 

 

 

 

 

 

 

 


max 

2 

2 

2 

3 

3 

4 

4 

5 

5 

6 

7 

1 The complex bearings are applicable to the category of single plane bearing d which corresponds to the same nominal outer diameter of same diameter 

series, without being applicable to d2 category. 

Table 4.4 (2) Outer rings 

m 

Nominal outer 

diameter 

D 

mm 

over 

incl. 

Allowable deviation of mean outer diameter 

 

 

∆Dmp 

 

 

 

 

 

 

Class 0,6,5 

 

 

 

Class 4 

high low high low 

Allowable variation 

of outer diameter 

 

VDp 

 

 

 

 

 

Class 0,6,5 

 

Class 4 

max 

Allowable variation ofraceway 

thickness 

 

Se 

 

 

 

Class 0,6,5,4 

max 

10 

18 

30 

18 

30 

50 

0 

0 

0 

11 

13 

16 

0 

0 

0 

7 

8 

9 

8 

10 

12 

5 

6 

7 

50 

80 

120 

180 

250 

315 

80 

120 

180 

250 

315 

400 

0 

0 

0 

0 

0 

0 

19 

22 

25 

30 

35 

40 

0 

0 

0 

0 

0 

0 

11 

13 

15 

20 

25 

28 

14 

17 

19 

23 

26 

30 

8 

10 

11 

15 

19 

21 

Depending on the applicable allowable value 

of S1 for d or d2 of same bearing. 

400 

500 

630 

500 

630 

800 

0 

0 

0 

45 

50 

75 

0 

0 

0 

33 

38 

45 

34 

38 

55 

25 

29 

34 

A-28


NTN 

Table 4.5 Allowable critical value for chamfering dimension 

Table 4.5 (1) Radial bearings 

mm 

Nominal bore diameter 

rs min 1 

d 

Radial direction Axial direction 

 

over incl. rs max 

0.15 

0.2 

0.3 

0.6 

1 

1.1 

1.5 

2 

2.1 

2.5 

3 

 

 

 

40 

 

40 

 

50 

 

120 

 

120 

 

80 

220 

 

280 

 

100 

280 

 

280 

 

 

40 

 

40 

 

50 

 

120 

 

120 

 

80 

220 

 

280 

 

100 

280 

 

280 

 

0.3 

0.5 

0.6 

0.8 

1 

1.3 

1.5 

1.9 

2 

2.5 

2.3 

3 

3 

3.5 

3.8 

4 

4.5 

3.8 

4.5 

5 

5 

5.5 

0.6 

0.8 

1 

1 

2 

2 

3 

3 

3.5 

4 

4 

5 

4.5 

5 

6 

6.5 

7 

6 

6 

7 

8 

8 

 

6.5 

9 

1 Allowable minimum values for the chamfering dimension "r" . 

Bearing bore surface 

(or outer surface) 

Table 4.5 (2) Thrust bearings 

rs min 1 

rs min 

rs max 

rs min 

Axial direction 

Inner ring side face 

(or outer ring side face) 

0.3 

0.8 

0.6 

1.5 

1 

2.2 

1.1 

2.7 

1.5 

3.5 

2 

4 

2.1 

4.5 

3 

5.5 

1 Allowable minimum values for the chamfering dimension "r" . 

rsmin 

rsmax 

Radial and axial directions 

rs max 

Radial direction 

mm 

Table 4.6 Basic tolerances 

m 

Basic dimension 

IT basic tolerance classes 

(mm) 

over incl. IT1 IT2 IT3 IT4 IT5 IT6 IT7 IT8 IT9 IT10 

3 

6 

3 

6 

10 

0.8 

1 

1 

1.2 

1.5 

1.5 

2 

2.5 

2.5 

3 

4 

4 

4 

5 

6 

6 

8 

9 

10 

12 

15 

14 

18 

22 

25 

30 

36 

40 

48 

58 

10 

18 

30 

18 

30 

50 

1.2 

1.5 

1.5 

2 

2.5 

2.5 

3 

4 

4 

5 

6 

7 

8 

9 

11 

11 

13 

16 

18 

21 

25 

27 

33 

39 

43 

52 

62 

70 

84 

100 

50 

80 

120 

80 

120 

180 

2 

2.5 

3.5 

3 

4 

5 

5 

6 

8 

8 

10 

12 

13 

15 

18 

19 

22 

25 

30 

35 

40 

46 

54 

63 

74 

87 

100 

120 

140 

160 

180 

250 

315 

250 

315 

400 

4.5 

6 

7 

7 

8 

9 

10 

12 

13 

14 

16 

18 

20 

23 

25 

29 

32 

36 

46 

52 

57 

72 

81 

89 

115 

130 

140 

185 

210 

230 

400 

500 

630 

500 

630 

800 

8 

9 

10 

10 

11 

13 

15 

16 

18 

20 

22 

25 

27 

30 

35 

40 

44 

50 

63 

70 

80 

97 

110 

125 

155 

175 

200 

250 

280 

320 

800 

1 000 

1 250 

1 000 

1 250 

1 600 

11 

13 

15 

15 

18 

21 

21 

24 

29 

29 

34 

40 

40 

46 

54 

56 

66 

78 

90 

105 

125 

140 

165 

195 

230 

260 

310 

360 

420 

500 

1 600 

2 000 

2 500 

2 000 

2 500 

3 150 

18 

22 

26 

25 

30 

36 

35 

41 

50 

48 

57 

69 

65 

77 

93 

92 

110 

135 

150 

175 

210 

230 

280 

330 

370 

440 

540 

600 

700 

860 

A-29

Bearing Internal Clearance 

NTN 

5. Bearing Internal Clearance 

5.1 Radial clearance 

Radial clearance in bearing (initial radial clearance) 

means the displacement value of bearing ring when the 

non-fixed ring was displaced in radial direction with either 

one of the inner ring and outer ring remained fixed, before 

the bearing is installed on a shaft or in a housing. 

Machined ring needle roller bearing (with inner ring) ; 

The initial clearance values for this bearing type are as 

shown in Table 5.1. Table 5.1 (1) shows the 

interchangeable clearances, which are remained 

unchanged even after inner ring or outer ring was 

reassembled in. Table 5.1(2) shows non-interchangeable 

clearances, which do not allow reassembly of inner ring 

or outer ring due to the narrow clearance range. The 

bearing clearances are represented by the symbols of 

C2, ordinary, C3 and C4 in the order from the smallest 

one and the non-interchangeable clearance symbols are 

followed by "NA" for identification. 

For the radial clearance values for bearing types 

other than the machined ring needle roller bearings, 

refer to "Commentary" described in the respective 

Dimensions Table. 

5.2 Running clearance 

5.2.1 Setting up running clearance 

Bearing clearance in running, that is, running clearance 

gets generally smaller than the initial radial clearance, 

depending on the fits and temperature difference 

between the inner ring and the outer ring. This running 

clearance must be set up optimally because setting up it 

improperly would lead to shorter life, overheat and 

vibration or running noise of bearing. 

Theoretically the bearing life comes to the maximum 

when the running clearance of bearing in normal running 

is slightly negative, but it is difficult to always hold this 

optimal condition during actual running. If the negative 

clearance value gets larger due to change of somewhat 

operating condition, it would cause significant reduction 

of bearing lifetime and overheat. To avoid such 

phenomena, generally proper initial radial clearance is 

selected and set up so the running clearance gets slightly 

larger than 0 (zero). 

In the case of usual operating conditions, in other words, 

application of the fits based on ordinary load, usual 

rotational speed and running temperature, etc., an 

optimal running clearance can be got by selecting an 

ordinary clearance. 

Table 5.1 Radial clearance in machined ring needle roller bearings 

Table 5.1 (1) Interchangeable bearings 

Unit m 

Nominal bore 

Radial clearance 

diameter 

d (mm) C2 Normal 1 C3 C4 

over incl. min max min max min max min max 

10 0 30 10 40 25 55 35 65 

10 18 0 30 10 40 25 55 35 65 

18 24 0 30 10 40 25 55 35 65 

24 30 0 30 10 45 30 65 40 70 

30 40 0 35 15 50 35 70 45 80 

40 50 5 40 20 55 40 75 55 90 

50 65 5 45 20 65 45 90 65 105 

65 80 5 55 25 75 55 105 75 125 

80 100 10 60 30 80 65 115 90 140 

100 120 10 65 35 90 80 135 105 160 

120 140 10 75 40 105 90 155 115 180 

140 160 15 80 50 115 100 165 130 195 

160 180 20 85 60 125 110 175 150 215 

180 200 25 95 65 135 125 195 165 235 

200 225 30 105 75 150 140 215 180 255 

225 250 40 115 90 165 155 230 205 280 

250 280 45 125 100 180 175 255 230 310 

280 315 50 135 110 195 195 280 255 340 

315 355 55 145 125 215 215 305 280 370 

355 400 65 160 140 235 245 340 320 415 

400 450 70 190 155 275 270 390 355 465 

1 Supplementary suffix codes of clearance is not added to bearing 

numbers. 

Table 5.1 (2) Non-interchangeable bearings 

Unit m 

Nominal bore 


diameter 

d (mm) C2NA NA 2 C3NA C4NA 


10 10 20 20 30 35 45 45 55 

10 18 10 20 20 30 35 45 45 55 

18 24 10 20 20 30 35 45 45 55 

24 30 10 25 25 35 40 50 50 60 

30 40 12 25 25 40 45 55 55 70 

40 50 15 30 30 45 50 65 65 80 

50 65 15 35 35 50 55 75 75 90 

65 80 20 40 40 60 70 90 90 110 

80 100 25 45 45 70 80 105 105 125 

100 120 25 50 50 80 95 120 120 145 

120 140 30 60 60 90 105 135 135 160 

140 60 35 65 65 100 115 150 150 180 

160 180 35 75 75 110 125 165 165 200 

180 200 40 80 80 120 140 180 180 220 

200 225 45 90 90 135 155 200 200 240 

225 250 50 100 100 150 170 215 215 265 

250 280 55 110 110 165 185 240 240 295 

280 315 60 120 120 180 205 265 265 325 

315 355 65 135 135 200 225 295 295 360 

355 400 75 150 150 225 255 330 330 405 

400 450 85 170 170 255 285 370 370 455 

2 For bearing with normal clearance, only NA is added to bearing numbers. 

EX. NA4920NA 

A-30

Bearing Internal Clearance 

NTN 

5.2.2 Calculation of running clearance 

The running clearance in bearing can be determined from 

initial radial clearance, reduced internal clearance 

incurred by effective interference, and temperature 

difference between inner ring and outer ring, using 

formula (5.1). 

eff o f t (5.1) 

where, 

eff : Running clearance mm 

o : Initial radial clearance mm 

f : Reduced internal clearance incurred by 

effective interference mm 

t : Reduced internal clearance incurred by 

temperature difference between inner ring 

and outer ring mm 

(1) Reduced internal clearance incurred by effective 

interference 

When a bearing is installed on a shaft or in a housing 

with some effective interference, the inner ring expands 

and the outer ring shrinks and, as the result, the radial 

clearance in the bearing reduces correspondingly. 

The expansion or shrinkage of inner ring or outer ring 

is approximately equivalent to 85% of the effective 

interference though depending on bearing type, shaft or 

housing profile, dimension and material. For the detail 

refer to Table 6.4 on page A-35. 

f 0.85∆deff 

(5.2) 

where, 

f : Reduced internal clearance incurred by 

effective interference mm 

∆deff : Effective interference mm 

(2) Reduced internal clearance incurred by 

temperature difference between inner ring and 

outer ring 

When a bearing is in running, the temperature of its 

outer ring is lower by 5 to 10˚C than that of its inner ring 

or rolling elements. Also, temperature difference between 

the inner ring and the outer ring gets larger when heat is 

radiated more from the housing or when the bearing shaft 

is communicated with a heat source and a heated fluid is 

flowing through a hollowed shaft. In such a case, the 

internal clearance reduces corresponding to thermal 

expansion difference between the inner ring and the 

outer ring which is incurred by this temperature 

difference. 

t ∆TDo (5.3) 

where, 

t : Reduced clearance value incurred by 

temperature difference mm 

: Linear expansion coefficient of bearing steel 

12.5 10 -6 /˚C 

∆T : Inner ring – outer ring temperature difference 

Do : Outer ring raceway diameter mm 

d : Bearing bore diameter mm 

D : Bearing outer diameter mm 

When a shaft or a housing is used as a direct raceway, 

temperature difference between the shaft and the 

housing is applied as temperature difference (∆T). 

5.3 Fits and bearing radial clearance 

Where the allowable tolerances for the shaft and the 

housing hole are already decided, the simple nomogram 

as shown in Fig. 5.1 is available as a guideline to 

decision of the initial radial clearance of bearing so as to 

enable to get an optimal clearance after the bearing was 

installed on the shaft/in the housing. The nomogram in 

Fig. 5.1 is used as the guideline as stated above. For the 

detail feel free to contact NTN. 

For example, where the fit condition for needle roller 

bearing with inner ring is already given as J7m6, Fig.5.1 

shows that clearance C3 must be secured to get the 

standard running clearance after installation. 

H6/7 J6 

Ordinary 

Tolerance range class 

for housing hole 

J7 K6 K7 M6 M7 N6 N7 

C3 


C4 


for shaft 

h5/6 j5 j6 k5 k6 m5 m6 n5 n6 

Fig. 5.1 Relationship between bearing fits and radial clearance 

A-31

Bearing Fits 

NTN 

7. Bearing Fits 

6.1 Interference 

For rolling bearings, the inner ring and outer ring are 

fixed on the shaft or in the housing so that relative 

movement does not occur between the fitted surfaces of 

the bearing ring and the shaft or housing in radial, axial 

and rotational directions when a load acts on the bearing. 

Such a relative movement, if occurred, would result in 

wear, fretting corrosion, friction crack, etc. on the fitted 

surfaces, which would then cause damage of the bearing 

and the shaft or the housing. Furthermore, wear powder 

invades into the bearing, then causing imperfect rotation, 

abnormal overheat, vibration, etc. 

The most effective way to fix a bearing is to assign an 

proper interference to the fitted surfaces between the 

bearing ring and the shaft or the housing and to thereby 

apply "tight fit" to the bearing. Furthermore, as its 

advantage this tight fit method supports the thin-walled 

bearing ring with uniform load throughout its entire 

circumference without any loss of load carrying capacity. 

The needle roller bearing is a bearing type enabling to 

separate the inner ring and the outer ring from one 

another and, therefore, it can be installed on a shaft or in 

a housing with an interference applied to both of its inner 

ring and outer ring. In the case of "tight fit", the easiness 

of bearing installation and removal is lost and, therefore, 

the bearing ring subjected to stationary load can be 

"loose-fitted". 

6.2 Necessity of proper fit 

Improper fit could lead to damage and shorter life of 

bearing. Therefore, advance careful analysis is needed 

for selection of proper fit. Representative examples of 

bearing defects caused by improper fit are as described 

below. 

¡Crack and earlier separation of bearing ring, and 

displacement of bearing ring 

¡Wear of bearing ring, shaft and housing caused by 

creep and fretting corrosion 

¡Seizure (sticking) caused by less internal clearance 

¡Insufficient running accuracy and abnormal noise 

caused by deformed raceway surface 

6.3 Fit selection 

Fit selection is generally done in accordance with the 

rule specified hereunder. 

The loads acting on each bearing ring are divided into 

running load, stationary load and directionally unstable 

load according to the direction and characteristic of loads 

acting on the bearing. 

"Tight fit" can be selected for a bearing ring subjected 

to running load and directionally unstable load and 

"stationary fit" or "loose fit" be selected for a bearing ring 

subjected to stationary load. (See Table 6.1) 

Where load of high magnitude or vibration and shock 

loads act on a bearing or a light alloy/plastic housing is 

used, it is necessary to secure a large interference. In 

that case, however, the housing rigidity must be 

considered carefully so as not allow occurrence of 

split damage, etc. 

For an application subjected to high running accuracy, 

bearings of high accuracy must be used with a shaft and 

a housing of higher dimensional accuracy so as not to 

apply a large interference thereto. Applying a large 

interference would cause the shaft or housing profile to 

be transferred to the bearing track, which could then 

interfere with the bearing running accuracy. The said 

bearings of high accuracy are used to prevent such 

possible phenomena. 

Table 6.1 Radial load and bearing fit 

Bearing running conditions 

Sketch 

Load 

characteristic 

Bearing fit 

Inner ring Outer ring 

Inner ring : Rotation 

Outer ring: static 

Load direction: constant 

Inner ring: static 

Outer ring: rotation 

Load direction: rotating 

with outer ring 

Rotating inner 

ring load 

Static outer 

ring load 

Tight fit 

Loose fit 

acceptable, too 

Inner ring: static 

Outer ring: rotation 

Load direction: constant 

Inner ring: rotation 

Outer ring: static 

Load direction : rotating 

with inner ring 

Inner ring: rotation or static 

Outer ring: rotation or static 

Load direction: The direction 

can not be fixed. 

Rotating inner 

ring load 

Static outer 

ring load 

Loose fit 

acceptable, too 

Tight fit 

Load direction is 

non-constant due to 

directional fluctuation, 

unbalanced load, etc. 

Directionally 

unstable load 

Tight fit 

Tight fit 

A-32

Bearing Fits 

NTN 

6.4 Recommended Fits 

The dimensional tolerances for the diameter of a shaft 

and the hole diameter of a bearing housing, on/in which a 

bearing is installed, are standardized under the metric 

system in ISO 286 and JIS B 0401 (Dimensional 

Tolerances and Bearing Fits). Hence, bearing fits is 

determined by selection of the dimensional tolerances for 

shaft diameter and hole diameter as applicable. Fig. 6.1 

shows the relationship between shaft diameter and 

bearing bore diameter and between housing hole 

diameter and bearing outer diameter. 

Table 6.2 shows the recommended fits for the 

machined ring needle roller bearings (with inner ring) that 

are generally selected based on the dimensional and load 

conditions. Table 6.3 shows the numerical fit values. 

For the recommended fits for others than the 

machined ring needle roller bearings, refer to 

"Commentary" described in the respective Dimension 

Tables. 

50m 

0 

50m 

f6 

g5 

g6 

h5 

h6 

js5 

js6 

k5 

n6 p6 

k6 m5 m6 

dmp 

50m 

50m 

0 

F6 F7 G7 

G6 

H6 

Dmp 

H7 

JS6 JS7 

K6 K7 

M6 M7 N6 N7 P6 P7 

R7 

Fig. 6.1 (a) Bearing fits on shaft 

Fig.6.1(b) Bearing fits in housing hole 

Table 6.2 Machined ring needle roller bearing fits 

Table 6.2 (1) Dimensional tolerance for shaft diameter 

Table 6.2 (2) Dimensional tolerances for housing 

Conditions 

Load characteristic Load magnitude Shaft diameter d 

mm 

Light load 

50 

50 

Rotating inner ring Ordinary load 

50150 

load or directionally 

unstable load 

150 

Heavy load and 

150 

shock load 

150 

Inner ring static 

load 

Medium- and low-speed 

rotation, light load 

General application 

When high rotational 

accuracy is required 

All dimensions 

Tolerance 

range class 

j5 

k5 

m5 

m6 

m6 

n6 

g6 

h6 

h5 

Conditions 

Tolerance 

range class 

Outer ring static load 

Ordinary and heavy load 

J7 

Two-split housing, ordinary load H7 

Rotating outer ring load 

Directionally unstable load 

Light load 

Ordinary load 

Heavy load and shock load 

Light load 

Ordinary load 

Heavy load and shock load 

M7 

N7 

P7 

J7 

K7 

M7 

When high rotational accuracy under light load is required K6 

Remarks: Light load, ordinary load and heavy load are classified per the 

following criteria. 

Light load : Pr0.06Cr 

Ordinary load : 0.06Cr< Pr0.12Cr 

Heavy load : Pr>0.12Cr 

A-33

Bearing Fits 

NTN 

Table 6.3 Numerical fit values for radial bearing (JIS Class-0) 

Table 6.3(1) Bearing fits on shaft 

Nominal bore 

diameter 

d 

mm 

Allowable 

deviation of 

mean bore 

diameter 

∆dmp 

g6 

h5 h6 j5 

Bearing Shaft Bearing Shaft Bearing Shaft Bearing Shaft Bearing 

k5 

Shaft Bearing 

m5 

Shaft 

Bearing 

m6 

Shaft 

Unit m 

n6 

Bearing Shaft 

pver incl. high low 

3 

6 

0 

8 

4T12L 

8T 

5L 

8T 

8L 

11T 

2L 

14T1T 

17T 

4T 

20T 

4T 

24T 

8T 

6 

10 

0 

8 

3T14L 

8T 

6L 

8T 

9L 

12T 

2L 

15T1T 

20T 

6T 

23T 

6T 

27T10T 

10 

18 

0 

8 

2T17L 

8T 

8L 

8T11L 

13T 

3L 

17T1T 

23T 

7T 

26T 

7T 

31T12T 

18 

30 

0 10 

3T20L 

10T 

9L 

10T13L 

15T 

4L 

21T2T 

27T 

8T 

31T 

8T 

38T15T 

30 

50 

0 12 

3T25L 

12T 11L 

12T16L 

18T 

5L 

25T2T 

32T 

9T 

37T 

9T 

45T17T 

50 

80 

0 15 

5T29L 

15T 13L 

15T19L 

21T 

7L 

30T2T 

39T11T 

45T11T 

54T20T 

80 

120 

0 20 

8T34L 

20T 15L 

20T22L 

26T 

9L 

38T3T 

48T13T 

55T13T 

65T23T 

120 

140 

160 

140 

160 

180 

0 25 

11T39L 

25T 18L 

25T25L 

32T11L 

46T3T 

58T15T 

65T15T 

77T27T 

180 

200 

225 

200 

225 

250 

0 30 

15T44L 

30T 20L 

30T29L 

37T13L 

54T4T 

67T17T 

76T17T 

90T31T 

250 

280 

280 

315 

0 35 

18T49L 

35T 23L 

35T32L 

42T16L 

62T4T 

78T20T 

87T20T 

101T34T 

315 

355 

355 

400 

0 40 

22T54L 

40T 25L 

40T36L 

47T18L 

69T4T 

86T21T 

97T21T 

113T37T 

400 

450 

450 

500 

0 45 

25T60L 

45T 27L 

45T40L 

52T20L 

77T5T 

95T23T 

108T23T 

125T40T 

Table 6.3 (2) Bearing fits in housing hole 

Nominal outer 

diameter 

D 

mm 

Allowable 

deviation of 

mean outer 

diameter 

∆Dmp 

H7 J7 K6 

Unit m 

K7 M7 N7 P7 

Housing Bearing Housing Bearing Housing Bearing Housing Bearing Housing Bearing Housing Bearing Housing Bearing 

over incl. high low 

6 

10 

0 

8 

0 

23L 

7T16L 

7T10L 

10T13L 

15T 

8L 

19T 

4L 

24T 

1L 

10 

18 

0 

8 

0 

26L 

8T18L 

9T10L 

12T14L 

18T 

8L 

23T 

3L 

29T 

3L 

18 

30 

0 

9 

0 

30L 

9T21L 

11T11L 

15T15L 

21T 

9L 

28T 

2L 

35T 

5L 

30 

50 

0 11 

0 

36L 

11T25L 

13T14L 

18T18L 

25T11L 

33T 

3L 

42T 

6L 

50 

80 

0 13 

0 

43L 

12T31L 

15T17L 

21T22L 

30T13L 

39T 

4L 

52T 

8L 

80 

120 

0 15 

0 

50L 

13T37L 

18T19L 

25T25L 

35T15L 

45T 

5L 

59T 

9L 

120 

150 

0 18 

0 

58L 

14T44L 

21T22L 

28T30L 

40T18L 

52T 

6L 

68T10L 

150 

180 

0 25 

0 

65L 

14T51L 

21T29L 

28T37L 

40T25L 

52T13L 

68T 

3L 

180 

250 

0 30 

0 

76L 

16T60L 

24T35L 

33T43L 

46T30L 

60T16L 

79T 

3L 

250 

315 

0 35 

0 

87L 

16T71L 

27T40L 

36T51L 

52T35L 

66T21L 

88T 

1L 

315 

400 

0 40 

0 

97L 

18T79L 

29T47L 

40T57L 

57T40L 

73T24L 

98T 

1L 

400 500 0 45 0108L 

20T88L 

32T53L 

Remarks: Fit symbols “L” and “T” represent bearing clearance and interference respectively. 

45T63L 

63T45L 

80T28L 

108T 

0 

A-34

Bearing Fits 

NTN 

6.5 Interference Calculation 

(1) Load and required interference 

When radial load acts on a bearing, the interference 

required to prevent a clearance between its inner ring and 

a steel solid shaft can be expressed in formulas (6.1) 

and (6.2). 

For Fr0.3 Cor, 

dFr dFr 

dF0.08 0.25 

 

(6.1) 

B 

B 

For Fr0.3 Cor, 

Fr 

Fr 

dF0.02 

0.2 

(6.2) 

B 

B 

Where, 

dF : Required effective interference mm 


B : Inner ring width mm 

Fr : Radial load N (kgf) 

C0r : Basic static load rating N (kgf) 

(2) Temperature rise and required interference 

When temperature rise of bearing (difference between 

bearing temperature and ambient temperature) is 

inevitable incurred by bearing running, the interference 

required to prevent a clearance between the inner ring 

and a steel shaft can be expressed in formula (6.3). 

dF0.0015dT(6.3) 

Table 6.4 Deformation and stress caused by bearing fit 

Where, 

dT : Required effective interference for temperature 

difference m 

T : Difference between bearing temperature and 

ambient temperature ˚C 


(3) Fitting surface roughness and required 

interference 

The fitting surface is smoothed (surface roughness is 

made less) by bearing fits so that the interference 

reduces correspondingly. The interference reduced value 

differs depending on the fitting surface roughness and 

generally the following reduction values must be 

prospected. 

For ground shafts : 1.0 to 2.5mm 

For lathe-turned shafts : 5.0 to 7.0 mm 

(4) Maximum interference 

Bearing ring fitted, with interference, on a shaft or in a 

housing results in tensile stress or compressive stress. 

Over-interference could cause cracking /splitting of 

bearing and short fatigue life of bearing. Therefore, in 

general the maximum interference is secured at 1/1000 

and less of shaft diameter or otherwise it is secured so 

the circumferential maximum stress generating on the 

fitting surface comes to 130MPa or less. (See Table 6.4) 

(5) Stress and deformation caused by interference 

When bearing ring (solid) is fitted with interference, it 

deforms elastically and this elastic deformation results in 

stress.(See Fig.6.2) The fitting surface pressure of 

bearing ring, circumferential tensile stress (inner ring), 

compressive stress (outer ring) and radial expansion of 

raceway (inner ring), and shrinkage(outer ring) can be 

calculated from Table 6.4. 

Item Inner ring Outer ring 

Surface 

pressure 

E deff 1k 2 2 1k0 

pi 

E Deff 1h 2 2 h0 

pe 

pMPa 2 d 1k 2 2 k0 2 D 1h 2 2 h0 

Circumferential 1k 2 

2 

maximum stress ipi (Tensile stress) 

1k 2 

epe (Compressive stress) 

MPa 

1h 2 

Radial elastic 

1k0 1h0 

deformation of ideffk (Expansion) eDeffh (Shrinkage) 

raceway 

1k 2 2 k0 1h 2 2 h0 

Where, 

d d0 De D 

kk0hh0 

di d D D0 

Remarks (Symbol representation) 

d Inner ring bore diameter (shaft diameter) mm 

d0 Hollowed shaft bore diameter 

(For solid shaft, d00) mm 

di Inner ring raceway diameter mm 

deff Effective interference for inner ring mm 

D Outer ring outer diameter 

(housing hole diameter) mm 

D0 Housing outer diameter 

(For sufficient housing size, D0) mm 

De Outer ring raceway diameter mm 

Deff Effective interference for outer ring mm 

E Modulus of elasticity (Young factor) 

2.0710 6 (21200) 

MPa (kgf/mm 2 ) 

 

p 

Fig.6.2 

 

A-35

Shaft Bearing and Fits Housing Design 

NTN 

7. Shaft and Housing Design 

Even if the bearing to be used is selected correctly, it 

can not fulfill its specific function unless the shaft/housing 

on/in which it is installed is designed correctly. 

Particularly for needle roller bearings the shaft and the 

housing must be designed under special consideration 

because the bearing ring thickness is thinner than that of 

other rolling bearings. 

7.1 Design of bearing installing portions 

Where a needle roller bearing with cage is used as an 

individual and is guided in axial direction directly by shaft 

shoulder (Fig.7.1), the shaft shoulder with which the cage 

side face comes in contact must be finished accurately 

and also is not allowed to have any raiser thereon. For a 

needle roller bearing subjected to high speed running, its 

contact surface is hardened and thereafter fine-finished 

by grinding. 

When a snap ring is used for axial guide of the cage 

(Fig.7.1), a thrust ring is inserted between the cage and 

the snap ring to prevent the cut section of the snap ring 

from contacting directly the cage. NTN shaft snap ring 

WR type specially designed for NTN needle roller 

bearings is available as the snap ring intended for axial 

guide of bearing cage. (Refer to Dimensions Table on 

page B-227.) 

On other hand, radial needle roller bearing can move 

freely in axial direction so that a ball bearing or a thrust 

bearing is used at single side for axial positioning of the 

shaft. Where axial load is less and, in addition, rotational 

speed is not so high(Ex. idle gear in a gear box), a thrust 

ring is fitted on the shaft, as illustrated in Fig. 7.2 and a 

sliding bearing is formed between the thrust ring and the 

outer ring or the housing end face for the purpose of axial 

positioning. In such a design, good care must be 

exercised so the guide surface is fully lubricated. Fig.7.3 

illustrates an example of the above thrust ring with oil 

groove on its guide surface. The boundary between this 

oil groove and the plane area must be chamfered for 

deburring. 

In general, for proper installation of needle roller 

bearing the inner ring and outer ring are both positioned 

in axial direction so that the bearing displaces in axial 

direction while running. 

Fig. 7.1 Bearing fixing by thrust ring 

Fig. 7.2 Bearing fixing in axial direction 

0.61mm 

56mm 

Round a corner 

Fig. 7.3 Design of thrust ring guide surface 

A-36


NTN 

(1) Inner ring 

For fixing inner ring correctly on a shaft, the shaft 

shoulder face is finished at the right angle against the 

shaft axial center and, in addition, the shaft corner is 

rounded smaller than the inner ring chamfer dimension. 

Where the corner roundness ra max must be made 

larger for specific shaft strength (Fig.7.4a) or the shaft 

shoulder is low (Fig. 7.4b), a spacer must be inserted 

between the shaft shoulder and the inner ring to hold a 

full contact surface with the inner ring. Furthermore, for 

facilitating inner ring pull-out work the shaft shoulder is 

provided with a notched groove,as illustrated in Fig. 7.5, 

to accept an inner ring pull-out jig (puller). 

NTN snap ring WR type for shaft use (Refer to 

Dimensions Table on page B-227) can be used for simply 

fixing inner ring in axial direction. (Fig. 7.6) Moreover, 

inner ring can be fixed in axial direction using an end 

plate or a side ring as illustrated in Figs. 7.7 and 7.8. 

Fig. 7.6 Inner ring fixing by snap ring 

ramax 

Fig. 7.7 Inner ring fixing by end plate 

rsmin 

a 

rsmin 

b 

Fig. 7.4 Inner ring fixing by use of spacer 

Fig. 7.5 Inner ring pull-out jig(puller) 

Fig.7.8 Inner ring fixing by side ring 

A-37


NTN 

(2) Outer ring 

Similarly to Para. 7.1(1) "Inner Ring", good care 

exercised of the shoulder profile of bearing housing for 

fixing outer ring in axial direction. 

Figs. 7.9 and 7.10 illustrate the methods of fixing outer 

ring in axial direction. 

NTN housing snap ring BR type (Refer to Dimensions 

Table on page B-229) can be used for fixing outer ring in 

axial direction. NTN BR type snap rings are designed to 

the dimensions adaptable to the needle roller bearings 

with low section height. However, commercially available 

snap rings conforming to JIS standard as applicable can 

also be used for the same bearings with adequately high 

section height. 

7.2 Bearing fitting dimensions 

The respective shoulder heights "h" of shaft and 

housing are designed larger than the maximum chamfer 

dimension rs max for bearing so the bearing end face 

comes in contact with the flat zone. And the corner 

roundness "ras" is designed smaller than the minimum 

chamfer dimension "rs" of bearing so as not to interfere 

with the bearing. Generally the radius of shaft and 

housing corner roundness shown in Table 7.1 is used as 

the shoulder heights of shaft and housing. 

The dimensions of the shafts and housings related to 

bearing installation are as described in the dimensions 

table for each bearing type. The shoulder diameter shown 

in this table means the effective shoulder diameter which 

comes in contact with the side face of bearing excluding 

the chamfered portion of shoulder. 

When the fitting surface of shaft or housing is finished 

by grinding, the shoulder corner must be provided with a 

relief. This relief dimension is as shown in Table 7.2. 

Table 7.1 Radius of shaft /housing corner roundness and 

shoulder height 

Unit mm 

rs min ras max h (min) 

0.15 

0.2 

0.3 

0.15 

0.2 

0.3 

0.6 

0.8 

1 

rs min 

ras max 

rs min 

h 

Fig. 7.9 Outer ring fixing by lid 

0.6 

1 

1.1 

1.5 

2 

2.1 

0.6 

1 

1 

1.5 

2 

2 

2 

2.5 

3.25 

4 

4.5 

5.5 

ras max 

rs min 

rs min 

h 

2.5 

3 

4 

2 

2.5 

3 

6 

6.5 

8 

Table 7.2 Relief grinding dimension for shaft and housing corners 

Unit mm 

rsmin b t rcs 

1 

1.1 

1.5 

2 

2.4 

3.2 

0.2 

0.3 

0.4 

1.3 

1.5 

2 

t 

b 

rs min 

rcs 

2 

2.1 

3 

4 

4 

4 

3.7 

5.9 

0.5 

0.5 

0.5 

0.5 

2.5 

2.5 

3 

4 

t 

rcs 

b 

rs min 

Fig. 7.10 Outer ring fixing by snap ring 

A-38


NTN 

7.3 Shaft and housing accuracy 

Because of its thin wall, the raceway surface accuracy 

of needle roller bearing ring is influenced by the 

respective fitting surface accuracy of a shaft /a housing 

on/in which the needle roller bearing is installed. In the 

case of general operating conditions, the fitting surfaces 

of shaft and housing may be finished by lathe-turning, but 

those must be finished by grinding where the acting load 

is great and, in addition, the requirements for accuracy 

and sound are strict. 

Table 7.3 shows the fitting surface accuracy, profile 

accuracy, surface roughness, and shoulder 

perpendicularity to fitting surface of each of shaft and 

housing under ordinary operating conditions. 

Table 7.3 Shaft and housing accuracy 

Characteristic item Shaft Housing 

Dimensional accuracy 

Roundness 

(max) 

cylindricality 

Shoulder perpendicularity (max) 

IT6IT5 

IT3IT2 

IT5IT4 

IT7IT6 

IT4IT3 

IT5IT4 

Fitting surface roughness 

0.8a 1.6a 

Remarks: The parenthesized values are applied to the bearings of accuracy 

class 5 and higher. 

Where a two-split housing is used, deformation of outer 

ring by housing clamping can be minimized by providing a 

relief on the mating surface at bore side. 

7.4 Raceway surface accuracy 

For needle roller bearings, shaft and housing are used 

as the raceway surface on application. The raceway 

dimensional accuracy, profile accuracy and surface 

roughness of shaft/housing must be equivalent to the 

raceway accuracy of bearing itself. Table 7.4 shows the 

specified surface accuracy and surface roughness of 

shaft/housing raceway. 

Table 7.4 Raceway surface accuracy (recommendation) 

Characteristic item Shaft Housing 

Dimensional accuracy IT5IT4 IT6IT5 

Roundness 

(max) 

cylindricality 

IT3IT2 IT4IT3 

Shoulder perpendicularity 

(max) 

Axial run-out 


(max) 

IT3IT2 

IT5IT4 

IT3IT2 

7.5 Material and hardness of raceway surface 

When the outer surface or bore surface of 

shaft(hollowed) or housing is used as raceway, it must be 

hardened to HRC58 to 64 for getting sufficient load 

capacity. For that, the materials shown in Table 7.5 are 

used after heat-treated properly. 

Table 7.5 Materials used for raceway 

When steel is surface-hardened by carburizing or 

carbonitriding, JIS Standard as applicable defines the 

depth from surface up to HV550 as an effective hardened 

layer. The minimum value of effective hardened layer 

depth is approximately expressed in formula (7.1). 

Eht min0.8Dw0.1+0.002 Dw (7.1) 

Where, 

Kinds of steel 

High carbon chrome bearing steel 

Carbon tool steel 

Nickel chrome molybdenum steel 

Chrome steel 

Chrome molybdenum steel 

Nickel chrome steel 

Representative 

example 

Related standards 

SUJ2 JIS G 4805 

SK3 JIS G 4401 

SNCM420 JIS G 4103 

SCr420 JIS G 4104 

SCM420 JIS G 4105 

SNC420 JIS G 4102 

Eht min : Minimum effective hardened layer depth mm 

Dw : Roller diameter mm 

7.6 Allowable bearing inclination 

The inner ring and outer ring of bearing incline a little 

eventually against one another depending on shaft 

deflection, shaft /housing machining accuracy, fitting 

deviation, etc. Although this allowable inclination differs 

depending on bearing type, bearing load, internal 

clearance, etc., the inclination degree shown in Table 7.6 

must be used as a guideline in the case of general 

applications because even minor inclination of inner ring 

and outer ring could cause reduction of bearing life and 

damage of cage. 

Table 7.6 

Bearing type Allowable inclination 

Radial needle roller bearing 1/2 000 

Thrust bearing 1/10 000 

Surface roughness 

For shaft diameter of 80 and less :0.2a 

For shaft diameter of over 80 to 120 :0.3a 

For shaft diameter of over 120 :0.4a 

Note) The parenthesized values are applied where high rotational accuracy is 

required. 

A-39

Lubrication 

NTN 

8. Lubrication 

The purpose of lubricating bearings is to form a thin oil 

film on the rolling and sliding surfaces and to thereby 

prevent metal to metal direct contact. Furthermore, 

lubricating rolling bearings has the following effects. 

(1) Reduction of friction and wear 

(2) Discharge of friction heat 

(3) Further extension of bearing life 

(4) Rusting prevention 

(5) Prevention of foreign matter invasion 

For achieving these lubrication effects it is necessary to 

select a good quality lubricant, to remove dust from the 

lubricant, and to design a proper seal structure for 

prevention of lubricant leak as well as to adopt the 

lubrication method suitable to the respective actual 

operating conditions. 

Rolling bearings are mostly lubricated with grease or 

oil, but solid lubricants such as molybdenum disulfide, 

graphite, etc. are used for special application. 

Further, the comparative data of grease lubrication and 

oil lubrication given in Table 8.1 can be utilized as the 

selection guide. 

Table 8.1 Characteristic comparison of grease lubrication with 

oil lubrication 

Lubrication method 

Comparative items 

Handling 

Grease 

lubrication 

 

Oil lubrication 

 

Fig. 8.1 An example of bearing unit with grease sector and 

grease valve 

8.1.1 Types and characteristics of grease 

Lubrication oil is composed of a lubrication base oil (ex. 

mineral oil base or a synthetic oil base) held with a 

thickener and various additives added thereto. The 

properties of grease is determined by the kinds and 

combination of base oil, thickener and additives. 

Table 8.2 shows the general types of grease and their 

characteristics. Even the grease of same type is 

significantly different in the performance depending on 

the grease brand selected. In selecting a grease brand, 

therefore, it is necessary to verify the property data 

submitted from the grease manufacturer. 

Reliability 

Cooling effect 

Seal structure 

Power loss 

Environmental pollution 

High speed running of bearing 

Extraordinarily advantageous 

Fairly advantageous 

 

 

 

(Recirculation needed) 

 

 

 

 

 

 

 

 

Advantageous 

Disadvantageous 

8.1.2 Base oil 

Mineral oil or synthetic oils such as diester oil, and 

synthetic oil such as silicone oil, fluorocarbon oil, etc. are 

used as the base oil for grease. 

The lubrication performance of grease is mainly 

determined by the lubrication performance of the base oil. 

In general, a grease composed of low viscosity base oil is 

excellent in low temperature characteristic and high 

speed performance and, on the other hand, a grease 

composed of high viscosity base oil is excellent in high 

load characteristic. 

8.1 Grease lubrication 

Grease lubrication is the simplest lubrication method. 

This method enabling to simplify design of the seal 

structure is broadly used. 

Important points in this lubrication method are to select 

an optimum grease and to fill it securely in a bearing. 

Particularly where the cage is guided by the inner ring or 

outer ring of bearing, good care must be exercised so the 

guide surface is fully greased throughout its entire area. 

Furthermore, for grease replenishment it is desirable to 

provide a grease sector and a grease valve, etc. as a 

grease replenisher. Fig. 8.1 illustrates an example of 

bearing unit with grease sector and grease valve. 

8.1.3 Thickener 

Thickener is blended and diffused in base oil to hold 

grease in semi-solid form. And various thickeners are 

available for use as follows; thickener composed of 

metallic soap such as lithium, sodium or calcium, etc., 

thickener composed of inorganic material such as silica 

gel, bentonite, etc., and non-soap base thickener 

composed of organic material such as polyurea, 

fluorocarbon, etc. 

The grease characteristics such as critical operating 

temperature, mechanical stability, durability, etc. are 

mainly determined by the kind of thickener used. In 

general, the sodium soap base grease is inferior to others 

in water resistance. Non-metallic soap base thickener 

composed of bentone, polyurea, etc. is excellent in high 

temperature characteristic. 

A-40

Lubrication 

NTN 

Table 8.2 Grease varieties and characteristics 

Grease name 

Lithium grease 

Sodium grease 

(Fiber grease) 

Calcium 

compound base 

grease 

Aluminum 

grease 

Non-soap grease 

Thickener 

Ca+Na soap 

Li soap Na soap Al soap 

Ca+Li soap 

Bentone, silica gel, urea, 

carbon black, etc. 

Base oil 

Mineral oil 

Dropping point ˚C 170190 

Operating 

temperature range ˚C 30130 

Mechanical stability Excellent 

Pressure resistance Good 

Water resistance Good 

Broadest 

application. 

Applications 

Grease for 

universal type 

rolling bearings. 

Diester oil 

170190 

50130 

Good 

Good 

Good 

Excellent in low 

temperature 

characteristic and 

anti-friction 

characteristic. 

Silicone oil 

200250 

50160 

Good 

Poor 

Good 

suited to high 

temperature and 

low temperature. 

Low oil film 

strength and 

unsuitable for 

high load 

application. 

Mineral oil 

150180 

20130 

Excellent to good 

Good 

Good to poor 

emulsified by 

inclusion of water 

content. 

Comparatively 

excellent in high 

temperature 


Mineral oil 

150180 

20120 



Good to poor 

Excellent in water 

resistance and 

mechanical 

stability. 

Suitable for 

bearing subjected 

to shock load. 

Mineral oil 

7090 

1080 

Good to poor 

Good 

Good 

Excellent in 

viscosity 


Suitable for 

bearing subjected 

to vibration. 

Mineral oil 

250 or more 

10130 

Good 

Good 

Good 

Synthetic oil 

250 or more 

50200 

Good 

Good 

Good 

Available for use in wide temperature 

range from low to high temperature. 

Some of non-soap base greases are 

excellent in heat resistance, cold 

resistance, chemical resistance, etc. 

subject to proper combination of base 

oil and thickener. 

Grease for universal type rolling 

bearings. 

Remarks: The operating temperature range in this table is the general characteristic value, not the guaranteed value. 

8.1.4 Additives 

Any greases contain various additives to improve the 

performance, for example, containing oxidation inhibitor, 

extreme pressure additives (EP additives), rust inhibitor, 

corrosion inhibitor, etc. 

A grease containing extreme pressure additives is used 

for bearings subjected to high load or shock load. A 

grease containing oxidation stabilizer is used for bearing 

applications wherein the operating temperature is 

comparatively high and no grease is replenished for a 

long time. 

8.1.5 Consistency 

"Consistency" is an index showing the hardness or 

fluidity of grease. The greater numerical value thereof is 

the softer hardness. This consistency is determined by 

the amount of thickener and the viscosity of base oil. 

Usually NLGI consistency codes 1 and 2 or 3 are used for 

lubrication of bearings. 

Table 8.3 shows the general relationship of grease 

consistency to application. 

8.1.6 Grease mixing 

When different greases are mixed together, the 

consistency of the mixed grease varies (generally 

softens) so that the allowable operating temperature gets 

lower. To avoid such characteristic variation of grease, it 

is not allowed to mix different greases, except mixing 

greases of same brand. 

Where mixing of different greases is inevitable, greases 

composed of thickener of same kind and similar base oil must 

be selected. Even when greases of same kind are mixed 

together, thus, the properties of the mixed grease could vary 

depending on difference in additives, etc. It is therefore 

necessary to check the property variation in advance. 

Table 8.3 Grease consistency 

NLGI 

consistency No. 

0 

1 

2 

3 

4 

Soft 

Hard 

JIS (ASTM) 

60-cycle mixed 

grease consistency 

355385 

310340 

265295 

220250 

175205 

Application 

For centralized greasing 

For centralized greasing 

For general application, for tight-sealed bearing 

For general application, for high temperature 

Special application 

8.1.7 Grease fill amount 

Grease fill amount differs depending on housing 

design, spacing volume, rotational speed, kind of grease, 

etc. 

Around 50% to 80% of static spacing volume in bearing 

and housing is deemed as a guideline to the fill amount. 

In the case of high rotational speed, this fill amount must 

be set up a little bit less for controlling temperature rise to 

a low rate. Too much fill amount of grease would 

cause the grease temperature to rise higher, which 

would then lead to reduction of the specific 

lubrication performance due to leak of the softened 

grease or quality change such as oxidation, etc. 

Further, for the machined ring needle roller bearing with 

inner ring the approximate value of spacing volume in the 

bearing can be determined by formula (8.1). 

V35W ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(8.1) 

where, 

V : Internal spacing volume (approximate value) cm 3 

W : Bearing weight kg (See Dimensions Table) 

A-41

Lubrication 

NTN 

8.1.8 Grease replenishment 

Lubrication grease must be replenished at an proper 

interval because its lubrication performance deteriorates 

with elapse of the bearing running time. However, this 

replenishing interval differs depending on bearing type, 

dimension, rotational speed, bearing temperature, kind of 

grease used, etc. 

Fig.8.2 gives the replenishing interval chart as a 

guideline. This chart is subject to use of a grease for 

ordinary rolling bearings under usual operating 

conditions. 

Needless to say, the grease replenishing interval must 

be the shorter as the bearing temperature gets higher. As 

an approximate guideline, when the bearing temperature 

is 80˚C or more, the replenishing interval shall be 

shortened by 1/1.5 whenever the bearing temperature 

rises by 10˚C. 

 

[Ex.] Determine the grease replenishing interval 

in the case when bearing NA4910R is in running 

under the conditions of radial load Pr 5kN510kgf 

and rotational speed n 1 600r/min. 

 

d =50mm 

no =4700 is determined from NA4910R 

Cr =48kN (4900kgf) and allowable rotational speed 

=4,700 r/min in the Dimensions Table. 

Accordingly, 

no 4700 

2.9 

n 1600 

Plot a line horizontally from d =50 point in Fig. 8.2 and 

Shaft diameter d 

mm 

400 

300 

200 

100 

50 

40 

30 

20 

10 

5 

Grease refilling 

deadline 

h 

# 

! 30 000 

20 000 

A 

10 000 

5 000 C 

4 000 

3 000 

2 000 

1 000 

500 

400 

300 

noAllowable rotational speed (See Dimensions Table) 

n Operating rotational speed 

no/n 

@ 

20.0 

Fig.8.2 Chart for determination of grease replenishing interval 

15.0 

10.0 

9.0 

8.0 

7.0 

6.0 

5.0 

4.0 

3.0 

2.0 

1.5 

1.0 

0.9 

0.8 

0.7 

B 

deem the intersection point with the vertical line ! as A. 

Thereafter, connect no /n=3 point B on the vertical line @ 

and said A point together, with a straight line, and 

determine the intersection point C with the vertical line #. 

And the grease replenishing interval of approximately 

4600 hours can be read from the intersection point C. 

8.2 Oil lubrication 

In general, oil lubrication is more suitable for high 

speed running application or high temperature application 

than grease lubrication. Oil lubrication is suitable for the 

case where heat value generating from a bearing or heat 

value being transferred to a bearing must be discharged 

outside the bearing. 

8.2.1 Lubrication method 

(1) Oil bath lubrication 

This oil bath lubrication is the most common of the 

currently available oil lubrication methods, which is 

applied to bearings running at low or medium speed. 

An important point in this method is control of oil level 

in an oil bath. 

For that, when bearings are installed on a horizontal 

shaft, it is common that a point close to the center of 

the rolling element in the lowest position should be 

deemed as the oil level to be secured during 

shutdown. In this case, the housing must be designed 

in such a profile as to minimize variation in oil level 

therein. Furthermore, it is desirable to provide the 

housing with an oil gauge to facilitate level check 

during running as well as shutdown. 

When bearings are installed on a vertical shaft, it is 

okay if 50 to 80% of the rolling elements are dipped in 

an oil bath under low speed running, but in the cases 

of high speed running and bearings used in multiple 

rows it is desirable to adopt the drip lubrication and 

circulating lubrication methods, and others described 

hereunder. 

(2) Spray lubrication 

This method sprays lubrication oil by an impeller of 

simple structure, which is mounted on the shaft, 

without directly dipping a bearing in an oil batch. This 

can be applied to bearings running at considerably 

high speed. 

(3) Drip lubrication 

This lubrication method is used where bearing runs at 

comparatively high speed and medium and less loads 

act on thereon. In this method, oil drips from an oiler 

provided on the top of a bearing unit strikes the rolling 

elements in its housing for atomizing lubrication (Fig. 

8.3) or otherwise 

a small amount of oil passes through the bearing. In 

many cases bearing is lubricated with several drips 

per minute though the number of oil drips per specific 

unit differs depending on bearing type and dimension. 

A-42

Lubrication 

NTN 

(4) Circulating lubrication 

This circulating lubrication method is adopted to cool 

down bearings or to lubricate automatically many 

lubricating portions by a centralized lubrication 

system. In more detail, as the features of this method 

the oil feed line is equipped with a cooler to cool down 

the lubrication oil and, in addition, provided with an oil 

filter to purify the lubrication oil. 

Under this circulating lubrication system, the 

lubrication oil must securely be discharged from each 

bearing after having passed through it. For that, it is 

important to provide an oil inlet and an oil outlet on 

each bearing in opposite position and to make the oil 

discharge port size as large as possible or otherwise 

to discharge the oil compulsorily. (Fig.8.4) 

(5) Others 

Jet lubrication, oil mist lubrication, air-operated oil 

lubrication, etc. are available as other lubrication 

methods. 

8.2.2 Lubrication oil 

Mineral oils such as spindle oil, machine oil, turbine oil, 

etc. are mostly used as the lubrication oil for bearings. 

However, synthetic oils such as diester oil, silicone oil, 

fluorocarbon oil, etc. are used under the operating 

conditions wherein bearings are subjected to running at 

high temperature of 150˚C and over or low temperature of 

-30˚C and less. 

For lubrication oil, its viscosity is one of the important 

characteristics that determine the lubrication 

performance. Too low viscosity of lubrication oil would 

cause imperfect forming of an oil film and finally cause 

damage of bearing surface, while too high viscosity of 

lubrication oil would cause great viscosity resistance, 

which would then lead to temperature rise and increase of 

friction loss. 

Generally lubrication oil of lower viscosity is used for 

the faster rotational speed of bearing, while lubrication oil 

of higher viscosity is used for the heavier bearing load. 

Lubrication of bearings needs the oil viscosity every 

each operating temperature which is specified in Table 

8.4. Fig. 8.5 shows the lubrication oil viscosity - 

temperature characteristic chart, which is referred to in 

selecting a lubrication oil of optimal viscosity under actual 

operating temperature. 

Furthermore, Table 8.5 shows the criterion for selection 

of the lubrication oil viscosity according to the actual 

bearing operating conditions. 

Table 8.4 Oil viscosity required for each bearing type 

Bearing type Required 

viscosity 

mm 2 /s 

Radial needle roller bearing 

Thrust needle roller bearing 

13 

20 

Fig. 8.3 Drip lubrication 

Viscositymm 2 /s 

3,000 

2,000 

1,000 

500 

300 

200 

100 

50 

30 

20 

15 

10 

8 

6 

5 

4 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 

- 30 - 20 - 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 

Temperature ˚C 

Fig. 8.5 Lubrication oil viscosity - temperature characteristic chart 

Fig.8.4 Circulating lubrication 

A-43

Lubrication 

NTN 

Table 8.5 Criteria for selection of lubrication oil (Reference) 

Bearing operating 

ISO viscosity grades for lubrication oil (VG) 

dn 

temperature ˚C 

value 

Ordinary load Heavy load or shock load 

300 

060 

up to allowable rotational speed 

up to 15000 

15 00080 000 

80 000150 000 

22 

46 

32 

22 

32 

68 

46 

32 

46 

100 

68 

32 

60100 

up to 15000 

15 00080 000 

80 000150 000 

150 

100 

68 

220 

150 

100150 

100150 

up to allowable rotational speed 

320 

Remarks: 

1. Subject to oil bath lubrication or circulating 

lubrication. 

2. Apply to NTN for other operating conditions 

other than those specified in this Table. 

8.2.3 Oil quantity 

Under an forced oil lubrication system, heat value 

generating from bearing, etc. is equal to the sum of heat 

value radiated from housing and heat value carried away 

by lubrication oil. 

Where a standard housing is used, the oil lubrication 

quantity as a guideline can be determined by formula 

(8.2). The radiated heat value differs depending on the 

shape /profile of a housing used. It is therefore desirable 

to determine the lubrication quantity best-suited to an 

actual equipment by adjusting it from a value 

approximately 1.5 to 2 times as much as the lubrication 

rate determined by formula (8.2). In addition, Where the 

lubrication quantity is calculated assuming that the 

generated heat value is all carried away by the oil, with no 

heat radiation from the housing, the oil quantity q can be 

determined, assuming that the shaft diameter on 2nd 

vertical line from the right side in (Fig. 8.6) Chart for 

Determination of Oil Quantity q is d=0. 

Q= Kq ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(8.2) 

Where, 

Q: Oil quantity per bearing cm 3 /min 

K: Coefficient being determined by operating 

temperature rise of oil (Table 8.6) 

q : Oil quantity that can be determined from the chart 

cm 3 /min (Fig.8.6) 

8.2.4 Fresh oil refilling interval 

Although it depends on actual operating 

conditions, oil quantity and the kind of lubrication oil 

used, the fresh oil refilling interval as a guideline is 

around one year where bearings are lubricated with 

oil of 50˚C and lower temperature by the oil bath 

method and is at least 3 months where bearings are 

lubricated with oil of 80 to 100˚C. 

For an important equipment it is desirable to 

monitor periodically the lubrication performance, 

cleanliness deterioration, etc. of the lubrication oil in 

use and to specify the fresh oil refilling interval under 

the monitor data. 

Table 8.6 K-value 

Discharged oil temperature - 

lubricating oil temperature ˚C 

10 

15 

20 

25 

Needle roller bearing 

K 

1.5 

1 

0.75 

0.6 

Auxiliary line 

2 

3 

4 

5 

6 

8 

10 

15 

20 

30 

40 

dn10 4 

1 


Load Pr 

N 

300 000 

200 000 

100 000 

70 000 

60 000 

40 000 

30 000 

10 000 

20 000 

15 000 

8 000 

6 000 

4 000 

2 000 


Shaft diameter 

d 

mm 

40 

0 

160 

140 

100 

80 

60 

20 

Lubricating oil 

quantity q 

cm 3 /min 

100 

200 

300 

400 

500 

600 

700 

800 

900 

1,000 

1,100 

1,200 

Fig. 8.6 Chart for determination of lubricating oil quantity 

A-44

Sealing Devices 

NTN 

9. Sealing Devices 

9.1 Non-contact seal and contact seal 

The purpose of using a seal is to prevent a lubricant 

held in a bearing from leaking outside the bearing and to 

prevent powder, water content, etc. from invading into the 

bearing from outside. 

It is very important to design a sealing device with good 

care, under full consideration of the operating conditions, 

lubricating condition, environmental condition, economical 

merit, etc., so that bearing running is not inversely 

affected by the sealing device. 

The bearing seals are mainly classified into non-contact 

seal, contact seal, etc. as shown in Tables 9.1 and 9.2, 

which must then be selected correctly according to each 

application,under full consideration of the characteristics 

of each sealing type. 

Table 9.1 Seals (Non-contact seals) 

Non-contact seals 

Type 

Seal type using a spacing Seal type using a centrifuge Seal type using air pressure 

Seal name 

Oil groove seal 

Labyrinth seal (axial, radial) 

Slinger seal 

Air seal 

Features 

 

This seal is fitted at either one side of a housing or a shaft, or 

fitted at the both sides for sealing action. In this case, this seal 

has also an effect in preventing invasion of foreign matter from 

outside by holding grease in the oil groove. 

< Labyrinth seal > 

This seal having a high sealing effect due to its multi-stage 

labyrinths and long passage is mainly used for grease lubrication. 

Generally it is suited to high speed bearing running, but it has a 

dust-proofing effect even under low speed running if the seal 

grooves are filled up with grease. It is convenient if this seal is 

provided with a grease nipple. 

In oil lubrication, this seal has 

an effect in slinging and returning 

the oil flown out along its sleeve 

by a centrifugal force if its sleeve 

is provided with projections. 

A seal example illustrated in 

Fig. 9.6 prevents invasion of 

foreign matter from outside. 

Fig. 9.1 Oil groove seal 

Fig. 9.4 Slinger with projections 

Application examples 

Fig. 9.2 Axial labyrinth seal 

Fig. 9.5 Slinger intended for back flow of flown-out oil by centrifuge 

Fig. 9.3 Radial labyrinth seal 

Fig. 9.6 Slinger provided at outer side 

A-45


NTN 

Table 9.2 Seals (Contact seals) 

Seal type 

Seal using mainly direct contact 

Contact seals 

Seal using mainly fluid lubrication and boundary lubrication 

Seal name 

Seal ring (felt seal, etc.) 

O-ring, 

piston ring 

Oil seal, 

V-shaped ring seal, 

mechanical seal 

Features 

This seal type seals a fluid perfectly by pressing its elastic body 

onto the sliding surface with a constant contact pressure. 

Generally the contact seals are more excellent in sealing 

performance than the non-contact seals, but the friction torque 

and temperature rise thereof are greater than those of the 

non-contact seals. 

 

This is the simplest of the contact seals, which is mainly used for 

grease lubrication and suited to prevention of fine dust, but oil 

penetration and outflow are occasionally unavoidable to some 

extent. 

< Oil seal > 

This seal type intended to seal lubricant at the sliding portion 

between its lip and a shaft has good sealing effect and is an 

effective seal in the most frequent use. 

The lip must be oriented outward to prevent invasion of water 

content and foreign matter from outside and oriented inward to 

prevent lubricant from leaking out of the housing. Furthermore, 

another seal type with two or more lips is also available for 

preventing lubricant leak and dust-proofing individually. 

Fig. 9. 7 Felt seal 


Fig. 9. 8 Z type grease seal 

Fig. 9.10 Oil seal 

Fig. 9. 9 GS type grease seal 

A-46


NTN 

9.2 Combined seals 

Several seal types are used in combination for a seal 

application under an environment where dust, water 

content, etc. exist so much or for mechanical portions 

which are not allowed to be contaminated by lubricant 

leak. 

Table 9.3 Clearances 

Seal type 

Oil groove seal 

Labyrinth seal 


Radial 

clearance 

50 and less 0.20.4 

Over 50 to 200 0.51.0 

50 and less 0.20.4 

Over 50 to 200 0.51.0 

Axial 

clearance 

1.02.0 

3.05.0 

9.4 NTN seals 

Special-purposed NTN seals are available for the 

needle roller bearings.(Refer to Table 9.4 on page A-48.) 

For the more detailed information refer to "Dimensions 

Table" on page B-233. 

Fig. 9.11 Combined non-contact seal 

Combination of labyrinth seal and oil groove seal 

9.5 Seal materials and corresponding operating 

temperature ranges 

The oil seal lip is ordinarily made of nitril rubber, but 

acrylic rubber, silicone rubber and fluoro-rubber are used 

as the lip material according to atmosphere temperature, 

an objective to be sealed, etc. Table 9.5 shows the 

operating temperature ranges available for the respective 

materials. 

Table 9.5 Seal materials and corresponding operating 

temperature ranges (Reference) 

Seal materials 

Nitril rubber 

Acrylic rubber 

Silicone rubber 

Fluoro-rubber 

Felt 

Operating temperature ranges ˚C 

25100 

15130 

70150 

30180 

40120 

9.6 Seal types and allowable speed 

The allowable speed for the contact seal type depends 

on the surface roughness, accuracy and lubrication 

property of sliding surface, operating temperature, etc. 

Table 9.6 shows the allowable speed every each seal 

type, as a guideline. 

Fig. 9.12 Combined seal 

Combination of contact seal and non-contact seal 

Table 9.6 Seal types and corresponding allowable speed 

(Reference) 

9.3 Clearance setting 

Oil groove seal and labyrinth seal have the better 

sealing effect as the shaft - housing clearance gets the 

smaller, but the actual clearance is generally selected 

from the following clearance values, under consideration 

of machining and assembling conditions, shaft 

deformation, etc. 

Seal types 

Felt seal 

Grease seal 

Oil seal (Nitril rubber) 

Oil seal (Fluoro-rubber) 

V-ring seal 

Allowable peripheral speed m/s 

4 

6 

15 

32 

40 

A-47


NTN 

Table 9.4 Seals (NTN contact seals) 

Seal type 

Features 

Contact seals (G type, GD type) 

Seal using mainly direct contact 

This seal type is a special-purposed seal for needle roller bearings which was designed for smaller section height so as to correspond 

flexibly to the said bearings. 

This is a synthetic rubber contact seal reinforced with steel plate, being then used in the operating temperature range of -25 to +120˚C 

and, under continuous running condition, used at 100˚C and less. For application under special operating conditions of over 120˚C at 

operating temperature, etc., feel free to contact NTN for any inquiry. 


Fig. 9.13 Bearing sealing by NTN seals (Example) 

9.7 Shaft surface roughness 

Sealing performance and seal life depend on the 

surface roughness, accuracy and hardness of shaft 

sliding surface with which the seal lip comes in contact. 

Table 9.7 shows the surface roughness as a guideline. 

For improving better the wear resistance of shaft surface 

it is desirable to secure the shaft surface hardness at 

least at HRC40 and over (at HRC55 and over if possible) 

by heat treatment and hard chrome plating. 

Table 9.7 Shaft surface hardness (Reference) 

Peripheral speed m/s 

over incl. 

5 

5 10 

10 


Ra 

0.8a 

0.4a 

0.2a 

A-48

Bearing Handling 

NTN 

10. Bearing Handling 

A rolling bearing is a precision part. It must be handled 

very carefully to keep its preciseness unchanged. 

Particularly the handling instructions given hereunder 

must be observed in handling. 

[1] Keeping bearing and other related parts clean 

Foreign matters such as mist, dust, etc. would cause 

harmful affect on bearing running and life. To avoid 

such harmful effect, bearing and other parts mounted 

adjacent to the bearing must be kept clean and, in 

addition, handling tools, lubricant, washing oil, work 

environment, etc. must always be maintained in clean 

condition respectively. 

[2] Careful handling 

Any shock to a bearing in handling would result in 

surface flaw and indent of its raceway surface and 

rolling elements and, in the worst case, result in 

cracking and chipping. To avoid such defects and 

trouble, bearings must be handled with good care. 

[3] Use of proper handling tools 

It should be avoided to use another inappropriate tool 

as an alternative of the specific tool in installing and 

removing. 

Specific tools suited to the individual bearing types 

must be used. The special-purposed handling tools 

must be used particularly when installing a drawn cup 

needle roller bearing. 

[4] Protection of bearing from rusting 

A rust preventive oil is coated on all of bearings, as a 

rule. However, direct handling of bearings by the bare 

hands would cause rusting of the bearings from 

adhesion of hand sweat thereto. To protect bearings 

from rusting, a pair of gloves must be put on or 

otherwise mineral oil be coated on the hands in the 

case of direct handling by the bare hands. 

10.1 Bearing storage 

Bearings are all shipped after coated with rust inhibitor 

and packaged. It is desirable to store bearings at room 

temperature and relative humidity of 60% and less. The 

storage period of a grease-filled and sealed bearing is 

limited to the specific lifetime of non-greased bearing. 

10.2 Installation 

Although depending on bearing type and fitting 

conditions, the bearing installing methods described 

hereunder are selectively available as the general 

method. However, refer to Commentary given in the 

Dimensions Table for installation of the drawn cup needle 

roller bearings. 

(1) Preparations prior to installing 

For installation of bearings it is desirable to prepare a 

cleaned and dried work place. 

Contaminant, burr, chips, etc. must be removed 

completely from all the parts related to a shaft and a 

housing before installing. 

Furthermore, the bearing mount must be inspected to 

verify whether its dimensional accuracy, profile 

accuracy and surface roughness are within the 

respective specified tolerance ranges. 

Bearings are all unpacked before installing. In the 

case of using bearings with grease lubrication, 

generally they may be installed as are without 

washing off the rust inhibitor coated thereon. 

Where a bearing is used with oil lubrication or the 

lubricating function of a grease-lubricated bearing is 

impaired by a mixture of grease and rust inhibitor, 

however, the bearing must be installed after complete 

removal of the rust inhibitor by clean washing oil. 

It is not allowed to wash shield type and seal type 

bearings and one-way clutch. 

(2) Press-fit by a press machine 

In general, the press-fit method using a press machine 

is widely used for installation of bearings. In detail, the 

bearing ring (inner ring or outer ring) is press-fitted 

slowly via a backing strip as illustrated in Fig. 10.1. It 

is not allowed to apply the press force to a bearing 

via its rolling elements like a bad example 

illustrated in Fig. 10.2 (page A-50). 

Further, a small size bearing with small interference 

may be installed by hammering the bearing ring with a 

plastic hammer or the like. In that case, however, the 

uniform hammering force must be applied to the 

bearing side face via the backing strip as 

illustrated in Fig. 10.1, because direct hammering 

to the bearing end face or partial hammering by 

use of a punch could impair the specific bearing 

performance. 

Fitting the inner ring on a shaft by hammering the 

outer ring or fitting the inner ring by hammering itself 

would result in surface flaw and indent of the raceway 

surface and the rolling elements. Therefore, doing so 

must be avoided absolutely. 

Also, friction of the fitting surface can be reduced by 

coating high viscosity oil on the surface. 

Stagger to be provided 

between the fitting jig 

and the inner ring. 

Fig. 10.1 Press-fitting of inner ring 

Air vent 

A-49


NTN 

Good example 

Fig.10.2 Press-fit 

Bad example 

(3) Shrinkage fit 

This shrinkage fit method is to fit the inner ring on a 

shaft after dipping it in hot oil for thermal expansion of 

its bore. This method is also widely used for 

installation of bearings. In heating the inner ring, lowcorrosive 

mineral oil or the like is used. In this case, 

the heated inner ring is natural-cooled down after 

shrinkage-fit, but simultaneously it shrinks in axial 

direction, too. Therefore, the inner ring must be 

pressed to the shaft shoulder until adequate cooldown, 

so as not to allow a clearance between the 

inner ring and the shoulder. 

In any case, however, it is not allowed to heat the 

inner ring up to over 120˚C. 

Fig. 10.3 shows the relationship of inner ring bore 

thermal expansion to heating temperature. 

Thermal expansion of inner ring bore m 

Required rising temperature = Heating temperature - room temperature 

280 

260 

240 

220 

200 

180 

160 

140 

120 

100 

80 

60 

40 

20 

Rising temperature 90˚C 

k5 

j5 

80˚C 

70˚C 

50 100 150 200 250 300 350 400 450 500 550 600 

Bearing bore diameter mm 

Fig. 10.3 Rising temperature required for shrinkage fit of inner ring 

60˚C 

r6 

p6 

n6 

m6 

50˚C 

40˚C 

30˚C 

280 

260 

240 

220 

200 

180 

160 

140 

120 

100 

80 

60 

40 

20 

10.3 Post-installation running test 

Bearing running test must be conducted on an installed 

bearing to check whether it was installed correctly. In this 

case, accelerating immediately the running speed up to 

the rated speed must be avoided absolutely. Doing so 

could result in damage of the bearing in the case of 

imperfect installation and seizure of the bearing in the 

case of inadequate lubrication. In testing, therefore, the 

shaft or the housing must first be rotated by hand and 

thereafter the shaft be rotated at low speed under no-load 

condition by the driving power, unless any failure is 

detected upon checking. After that, the running speed 

and load on the bearing must be accelerated and 

increased gradually while checking the running condition. 

Running sound level and tone of a bearing can be 

checked by a sound scope held in contact with the 

bearing housing. The sound is normal if it is a pure sound 

upon checking. In this case, high metallic sound or 

irregular sound from the bearing, if any, reveals 

occurrence of somewhat failure. In such a case, possible 

cause of the failure can be presumed by measuring 

quantitatively vibration amplitude and frequency using a 

vibrometer. 

Generally bearing temperature is presumed from the 

circumferential temperature of a housing. However, it can 

be judged more exactly if possible to measure directly the 

outer ring temperature by utilizing the oil hole thereof, etc. 

Needless to say, bearing temperature rises with elapse 

of the running time and reaches a constant level after a 

certain time. Rapid bearing temperature rise or continued 

temperature rise in excess to the constant level or 

abnormally high bearing temperature would reveals 

occurrence of somewhat failure. In such a case, careful 

check is required. 

Table 10.1 shows the required check items. 

Table 10.1 

Hand 

operation 

Power 

operation 

Variation in torque 

Over-torque 

Chattering 

Abnormal sound 

Abnormal noise 

and vibration 

Abnormal 

temperature 

 

Imperfect installation 

Under-clearance, great seal friction, etc. 

Indent and flaw on raceway surface 

Inclusion of dust and other foreign matter 

Inclusion of dust and other foreign matter, 

indent on raceway surface,over-clearance, 

inadequate lubrication 

Use of improper lubricant, imperfect 

installation, under-clearance 

10.4 Bearing removal (dismounting) 

Some related bearings are removed from each shaft, 

incurred by periodic disassembly or incidental trouble of a 

machine. In this case, these bearings must be handled 

with good care similarly to the case of installation, when 

they are reused or the condition thereof is examined after 

removed (dismounted). Too tight fit of a bearing would 

incur difficulty in dismounting and, therefore, the bearingrelated 

construction must be fully considered in design of 

A-50


NTN 

the bearing fixing method. 

Regarding the dismounting method, generally the press 

method (Fig. 10.4) and the puller method (Fig.10.5) are 

available for dismounting inner ring though depending on 

bearing type and fitting conditions. 

When inner ring is dismounted from a shaft by heating, 

good care must be exercised not to over-heat the inner ring. 

d 

f E B1 2 

F1 

B Inner ring width mm 

d Inner ring bore diameter mm 

F1 Mean outer diameter of inner ring mm 

dFApparent interference m 

Actual press-fit force and pull-out force could eventually 

exceed the respective calculate value due to installing 

error. Hence, it is recommended to design the 

dismounting tools so as to have the strength (rigidity) 

resistible to a load 5 times as much as the calculated 

press-fit force and pull-out force. 

Fig. 10.4 Bearing removal by a press machine 

10.6 Washing 

Rotating a bearing with foreign matter adhered thereto 

could result in damage of the raceway surface, etc. 

Therefore, any dismounted bearing is usually washed by 

light oil or kerosene or the like for complete removal of 

foreign matter. In this case, two washing vessels must be 

used as follows; one for rough washing and another for 

finish washing. Rough washing is done for removal of oil 

and foreign matter from bearing, while finish washing is 

done for fine washing of the roughly-washed bearing. 

Further, any vessels used for washing must be provided 

with a steel net as the middle bottom above the vessel 

bottom, as illustrated in Fig. 10.6, to prevent the bearing 

from coming in direct contact with the vessel bottom. 

Furthermore, rust preventive treatment must be applied 

to the washed bearing immediately after washing, to 

thereby protect it from a risk of corrosion. 

In addition, the legal requirements as applicable 

(environmental preservation, industrial labor safety and 

health, etc.) and the washing specification submitted from 

a detergent manufacturer must be taken in consideration 

in washing. 

Fig. 10.5 Bearing removal by a puller 

10.5 Force required for press-fit and pull-out 

The force required for press-fitting or pulling out inner 

ring on / from a shaft can be determined by formula 

(10.1). 

d 

Kaf K f E d F (10.1) 

d3 

Where, 

Ka Force required for press-fitting or pulling-out N (kgf) 

f K Resistance factor being determined by shaft to 

inner ring friction factor 

For press-fitting 40 (4) 

For pulling-out60 (6) 

Coefficient depending on inner ring dimension 

f E 

Fig. 10.6 Washing tank 

A-51


NTN 

11. Technical Data 

11. 1 HL Bearing 

The form of bearing separation life can be mainly 

classified into the internal origin type and the surface 

origin type. Bearing separation of the surface origin type 

is said to occur in an inadequately lubricated area and it 

is widely recognized that the bearing separation life 

correlates to the oil film parameter that can be determined 

by "Elastic Fluid Lubrication Theory (EHL Theory)". 

This oil film parameter must be increased for controlling 

the surface origin type separation and, for that, the 

bearing manufacturers have made possible effort for 

better improvement of lubricant and for upgrading of the 

bearing rolling raceway surface roughness. 

In recent years it has been proposed by the relative 

field that the capability of forming an oil film on contact 

surfaces could be improved better by changing the form 

and directivity of surface roughness of machined parts. 

On the other hand, NTN developed successfully long 

life HL (High Lubrication) bearings under "Micro EHL 

Theory" as one of the countermeasures against surface 

origin type separation. And these HL bearings have been 

widely used in each field since developed. 

11.1.1 Basic concept of HL bearing 

Fig. 11.1 illustrates the basic concept of the HL 

bearing. 

In this Figure, the hatched area shows a contact 

portion deformed elastically and the dotted line shows the 

lubrication flow, based on "Internal lubrication fluid flow 

model in contact portion" disclosed by H.S. Cheng and 

others. 

Lubricant flow in (B) has a resistance greater than that 

in (A). This means that the quantity of a fluid existing 

internally in the contact portion increases. In other words, 

the thickness of an oil film formed on the rolling contact 

surface increases with increase of the fluid quantity. 

11.1.2 HL surface 

Fig. 11.2 is a magnified photo showing roller surface. In 

this Figure the blackened spots are micro recessed spots 

and, as seen from this Figure, a number of micro oil pots 

of around several tens mm exist at random. The recessed 

spots on this surface can be modified into any optional 

size and the number of spots by changing the machining 

conditions. Fig. 11.3 shows the bus line form of the HL 

surface, from which the depth of the micro recessed spots 

is nearly 1 mm. 

11.1.3 HL bearing application examples 

The HL surface-treated bearings are widely used in 

various fields. For example, they are used for car 

transmission, hydraulic devices, various reduction gears, 

etc. 

As an example of special application, HL surface 

treatment is applied to the special-purposed bearing for 

the rocker arm of car engine. This is highly appreciated 

as an effective seizure preventive measure. 

Fig. 11.2 Magnified photo showing roller surface 

A 

B 

1m 

0.1mm 

Fig. 11.1 Directivity of finished surface and lubrication fluid 

flow model 

Fig. 11.3 Bus line form of HL surface 

A-52


NTN 

11.2 Bearings with Solid Grease 

Bearings with Solid Grease means a bearing in which 

thermal solidification type grease (mainly composed of 

lubrication grease and resin) is filled as a lubricant 

material. 

Once this thermal solidification type grease (referred to 

as Bearings with Solid Grease) was heated and cooled 

down (hereinafter referred to "heat treatment"), the pastelike 

grease hardens as much lubricant held unchanged. 

The Bearings with Solid Grease is solidified after heat 

treatment so that the lubricant does not leak easily even 

in the case wide amplitude vibration and strong centrifuge 

act on the bearing, thus contributing to prevention of 

lubricant leak and longer bearing life. 

The spot pack specification in which Bearings with 

Solid Grease was packed at multiple points on the cage 

and the full pack specification in which Bearings with 

Solid Grease was nearly full-packed in the spacing 

volume of bearing are both available for the Bearings with 

Solid Grease. Further, the needle roller bearings are all 

based on the full pack specification. 

11.2.1 Characteristics of Bearings with Solid Grease 

(1) Less lubricant leak 

Bearings with Solid Grease holds much lubricant 

internally in bearing because it is solidified after heat 

treatment. This lubricant is gradually fed onto the 

rolling surface by heat generating from the bearing 

and centrifuge, whereby lubricant leak is minimized. 

This serves to prevent the peripheral environment 

from being contaminated, comparing with general 

lubrication greases. 

(2) Good lubricating characteristic 

Even when wide amplitude vibration and strong 

centrifuge act on a bearing, lubricant does not leak 

easily and, in addition, Bearings with Solid Grease 

does not emulsify and flow out easily, because of its 

solid type, even in the case of water content inflow to 

bearing. 

Thus, the lubricating characteristic is more excellent 

than general lubrication greases. 

11.2.2 Attentive points in using Bearings with Solid Grease 

(1) The needle roller bearing dimension to accept 

Bearings with Solid Grease differs every each bearing 

type. Feel free to contact NTN for the detail. 

(2) The allowable temperature range is -20˚C to 80˚C, but 

60˚C and less for continuous long term running. Fully 

note the operating temperature. 

(3) Allowable rotational speed Fwn value (Fw = inscribed 

circle diameter [mm]) (n= operating rotational 

speed [r/min]) is differs from that in use of general 

grease and lubrication oil. 

Fully note this matter. 

Use any needle roller bearings on Fwn value = 

30,000 and less. 

(4) For the bearings of the full pack specification, 

minimum load equivalent to at least around 1% of the 

basic dynamic load rating is needed for enabling the 

rolling elements to run without slipping. 

(5) Bearings with Solid Grease acts as a preventive 

barrier against foreign matter invading from outside, 

but does not function perfectly as a seal. Therefore, 

combined use of Bearings with Solid Grease and 

rubber seal is recommended particularly when high 

sealing performance is required. 

11.2.3 Application examples of Bearings with Solid 

Grease bearings 

¡Bearing for the paper feeder of a printing machine 

¡Bearing for the mast roller guide of a forklift 

¡Support bearing for the swing arm of a two-wheeled car 

¡Bearing for a machine tool 

¡Guide bearing for the guide unit of a press machine 

¡Bearing for the link mechanism of an automatic loom 

¡Bearing for the conveyor guide of a food packaging 

machine 

(3) Sealing effect 

Bearings with Solid Grease acts as a preventive 

barrier against foreign matters (water content, dust, 

etc.) invading from outside, but does not function 

perfectly as a seal. Therefore, use of the contact type 

rubber seal (for deep groove ball bearing, bearing 

unit) or another seal (for other bearings) is 

recommended particularly when high sealing 

performance is required. 

A-53


NTN 

11.3 Calculation Examples 

11.3.1 Shrinkage factor and post-installation 

clearance of drawn cup needle roller bearing 

The recommended fit data for the standard bearings is 

as described in Table 1 on page B-33. This paragraph 

describes hereunder the calculation methods to be used 

when the bearing fit conditions are reviewed in detail. 

2) Inscribed circle diameter after complete bearing fit 

in the housing on actual machine 

[1] Inscribed circle diameter in press-fitting of master ring 

T 

1) Calculation of bearing shrinkage factor 

For the drawn cup bearings, the shrinkage factor is 

calculated using the following method. 

H 

Fig. 11.5 

D 

DH 

Housing 

de 

Drawn cup bearing 

1S 2 

2t 

0.7S 2 1.31t 2 0.71.3t 2 1S 2 11.1 

E 2 

 

E 1 E 2 

Where, 

Outer ring shrinkage factor 

DH Housing outer diameter mm 

dnom Nominal diameter of fitting portion mm 

de Rolling surface diameter of outer ring mm 

E Modulus of housing vertical elasticity 

(Young’s modulus) MPa (kgfmm 2 ) 

E Modulus of outer ring vertical elasticity 

(Young’s modulus) 

2.0710 6 MPa (21 200kgfmm 2 ) 

dnom 

S 

DH 

de 

t 

dnom 

Fig. 11.4 

dnom 

H Housing inner diameter mm 

T Roller diameter + plate thickness mm 

D Outer diameter of drawn cup needle roller bearing mm 

Li Post press-fit inscribed circle diameter mm 

When the master ring is press-fitted, the dimension of 

"roller diameter + plate thickness" remains unchanged. 

Hence, the inscribed circle diameter Li is determined by 

the following formula. 

LiD2TDH1D2TH 

(11.2) 

Determine the mean value of "roller diameter + plate 

thickness" (=T) and standard deviation from formula 

(11.2). The mean value of formula (11.2) is determined 

as follows. 

mLi1mDm2TmH 

Standard deviation of formula (11.2) 

(11.3) 

Li212D22T 22H 2 (11.4) 

In the case of master ring, due to H 2=0 the formula 

(11.4) is expressed as follows. 

Li212D22T 2 (11.5) 

The unknown values in formulas (11.3), (11.5) are only 

mT and 2T 2 . Hence, substitute the known numerical 

values for formulas (11.3), (11.5) to determine m2T and 

2T 2 . 

[2] Even when bearing ring is press-fitted in the housing 

on actual machine, consider the inscribed circle 

diameter similarly to the master ring press-fit. 

Herein, the calculation formulas for press-fit in the 

housing on actual machine can be discriminated as 

follows from formula (11.3), (11.4) by adding " " to 

each formula. 

mLi1mDm2TmH (11.6) 

Li212D22T 22H2 (11.7) 

[3] For m2T and 2T 2 in formula (11.6), (11.7), substitute 

the values determined previously for the respective 

formula. 

[4] From the calculations, the inscribed circle diameter in 

press-fitting in the housing on actual machine can be 

A-54


NTN 

expressed in the following formula 

LimLi3Li 

(11.8) 

[5] Radial internal clearance can be determined 

considering the mean value and standard deviation of 

shaft in formulas (11.6), (11.7). 

[6] The aiming radial internal clearance value is generally 

set up so an ordinary clearance can be got. However, 

the recommended clearance values are available 

every the individual portions in the case of bearing 

application to automobile. Feel free to contact NTN for 

the detail. 

11.3.2 Track load capacity of cam follower and roller 

follower 

The reference hardness (reference tensile stress) was 

set up from the relationship between the follower 

hardness and net tensile stress of the material and the 

track load capacity was determined 

from the relationship of the setup reference stress to 

hertz stress. 

How to set up the reference hardness (tensile stress) 

differs a little bit depending on each bearing 

manufacturer. Herein, the relevant Table appended to 

"JIS Handbook for Irons and Steels" was used as the 

hardness - tensile stress relationship. 

(Approximate numerical value under JIS Z8413 

Revised Conversion Table) 

For HRC40, = 1.245MPa (127kgf/mm 2 ) was adopted 

as the reference hardness (tensile stress). 

 

The tensile stress strength of the follower material 

increases with increase of its hardness, and the track 

load capacity of the follower increases incurred by 

increase of the tensile strength strength. In this case, the 

load capacity increase rate can be determined by 

multiplying the track load capacity by applicable track 

load capacity adjustment factor shown in Table 11.1. 

Note) The track load capacity determined herein is based 

on net tensile stress as the reference, not allowable 

hertz stress. Generally stress (specific stress) 

resulting in creep of follower material is greater than 

the tensile stress. Particularly in the case of static 

load, this track load capacity comes to a safety side 

value. 

[Ex.] Determination of load capacity Tc of track with 

certain hardness by use of track load capacity 

adjustment factor. 

Assuming track load capacity described in 

Dimensions Table as Tc and track load capacity 

adjustment factor at applicable hardness as G 

respectively, the track load capacity Tc can be 

determined as follows. 

TcGTc 

For hardness HRC50 at NATR15X, 

Tc11 900N (1 220kgf) G1.987 

Tc1.98711 900N (1 220kgf) 

23 645N (2 424kgf) 

Reference (Track load capacity calculation process) 

 

¡For a cylindrical outer ring 

 

1 Tc 

max 60.9 Beff 

 

¡For spherical R outer 

 

187 

3 

max 

2 Tc 

1 245MPa (127kgfmm 2 ) 

Tc Track load capacity N (kgf) 

Sum of curvature 

BeffEffective contact length mm 

Herein (Outer ring width - chamfer) 

Factor being determined by curvature 

Table 11.1 Track load capacity adjustment factor 

Hardness 

HRC 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

Tensile strength Adjustment factorG 

MPakgfmm 2 for cylindrical outer ring for spherical R outer ring 

755 77 

774 79 

784 80 

804 82 

823 84 

843 86 

862 88 

882 90 

911 93 

931 95 

951 97 

980 100 

1 000 102 

1 029 105 

1 058 108 

1 078 110 

1 117 114 

1 156 118 

1 176 120 

1 215 124 

1 245 127 

1 294 132 

1 333 136 

1 382 141 

1 431 146 

1 480 151 

1 529 156 

1 578 161 

1 637 167 

1 686 172 

1 754 179 

1 823 186 

1 882 192 

1 950 199 

2 009 205 

2 078 212 

0.368 

0.387 

0.397 

0.417 

0.437 

0.459 

0.480 

0.502 

0.536 

0.560 

0.583 

0.620 

0.645 

0.684 

0.723 

0.750 

0.806 

0.863 

0.893 

0.953 

1.0 

1.080 

1.147 

1.233 

1.322 

1.414 

1.509 

1.607 

1.729 

1.834 

1.987 

2.145 

2.286 

2.455 

2.606 

2.787 

0.223 

0.241 

0.250 

0.269 

0.289 

0.311 

0.333 

0.356 

0.393 

0.419 

0.446 

0.488 

0.518 

0.565 

0.615 

0.650 

0.723 

0.802 

0.844 

0.931 

1.0 

1.123 

1.228 

1.369 

1.519 

1.681 

1.853 

2.037 

2.274 

2.484 

2.800 

3.141 

3.455 

3.847 

4.206 

4.652 

A-55


NTN 

11.3.3 Outer ring strength 

Generally any outer ring never breaks down as long as 

the load acting it is a usual operating load. This 

paragraph describes hereunder the strength calculation 

method to be used when the outer ring strength under 

shock load and heavy load is reviewed. 

The outer ring strength can be determined using the 

formula given hereunder, assuming the respective outer 

ring profiles as illustrated in Fig. 11.6. In this case, the 

outer ring rupture strength means the bridged rupture 

strength of roller. 

11.3.4 Stud strength of cam follower 

Fr 

Shaft section view 

R A 

Fig. 11.7 

h2 

h2 

h 

Centroid 

D2h 

D 

h 

KR,KRV,NATR,NATV 

Fig. 11.6 

NUKR,NUTR 

Centroid 

D2h 

D 

When load Fr acts on the center point of outer ring as 

illustrated in Fig.11.7, bending moment FrRgenerates 

and consequently bending stress 1 (deemed as tensile 

stress) acts on the stud surface. In addition to this 

bending stress, tensile stress 2 generates from screw 

tightening because the stud itself is clamped to machine 

body with nuts. The stud strength can be reviewed from 

comparison of the sum (1 + 2) of these two tensile 

stresses with allowable stress for the stud material. 

Regarding how to set up breaking stress, in general 

1760MPa (180kg/mm 2 ) can be set up as the breaking 

stress for bearing steel, but it is desirable to set up the 

breaking strength with safety-side value (1170MPa 

[120kgf/mm 2 ]), where stress concentration is taken into 

account. Generally any outer ring never break down as 

long as the load acting on it is usual operating load, but it 

necessary to check the rupture structure of outer ring, 

where shock load and heavy load act on it. 

4 D2h 

PI 

1f hD2h 2 2 

Where, 

sin1cos 

f 

2cos 

 

rad. 

Z 

P Breaking load (N) 

I Secondary moment of outer ring section (mm 4 ) 

Z Number of rollers 

Breaking stress (MPa) 

Dhh2per Fig. 11.6 (mm) 

12 

FrR 

1 Z 

Fr Maximum radial load 

Z Coefficient of shaft section through Point-A 

298MPa (10kgf/mm 2 ) 

Tensile stress generating from maximum tightening 

torque described in "Dimensions Table" 

Allowable stress for material 

The following values are adopted from the repeated 

bending test result of the stud material. 

Where the stud material is subjected to static 

bending stress; 

1372MPa (140kgf/mm 2 ) 

Where the stud material is subjected to repeated 

bending stress (single direction) 

784MPa (80kgf/mm 2 ) 

Where the stud material is subjected to repeated 

bending stress (double directions) 

392MPa (40kgf/mm 2 ) 

Accordingly, 

Z 

Fr2 

R 

A-56

Bearing Type Symbols and Auxiliary Symbols 

NTN 

12. Bearing Type Symbols and Auxiliary Symbols 

Table 12.1 Bearing Type Symbols 

Type code 

Bearing type 

Type code 

Bearing type 

811 

812 

893 

A 

AS11 

ARN 

AXK11 

AXN 

BF 

BK 

BR 

CRV 

DCL 

F 

FF 

FR 

FRIS 

G 

GD 

GK 

GS811 

GS812 

GS893 

HCK 

HF 

HFL 

HK 

HMK 

IR 

JFS 

JPUS 

K 

K811 

K812 

K893 

KBK 

KD 

KH 

KLM 

KLMS 

KLMP 

KR 

KRU 

KRV 

KRVU 

Single-direction thrust cylindrical roller bearing, dimension series 11 



Needle roller, spherical type 

Steel plate thrust washer, dimension series 11 

Needle roller bearing with double-direction thrust cylindrical roller bearing 

Thrust needle roller bearing, dimension series 11 

Needle roller bearing with double-direction thrust needle roller bearing 

Metallic flat cage for linear flat rollers 

Drawn cup needle roller bearing with close end 

Snap ring for bearing housing 

Full complement roller for cam follower, 

inch series 

Drawn cup needle roller bearing with open end, inch series 

Needle roller, plane type 

Linear flat roller 

Bottom roller, for drawing frame (textile machine) 

Bottom roller 

Synthetic rubber seal, one-lip type 

Synthetic rubber seal, double-lip type 

Needle rollers with split type cage 

Outer ring for thrust bearing, dimension series 11 



Drawn cup needle roller bearing for cross joint 

One-way clutch 

One-way clutch integral with bearing 

Drawn cup needle roller bearing with open end 

Drawn cup needle roller bearing with open end, for heavy load application 

Inner ring 

Arms for tension pulley and jockey pulley 

Tension pulley and jockey pulley 

Needle rollers with cage 

Thrust cylindrical roller, dimension series 11 



Needle roller and cage assembly for small ends 

Linear ball bearing, stroking type 

Linear ball bearing, drawn cup type 

Linear ball bearing, machined ring type 

Linear ball bearing, clearance-adjustable type 

Linear ball bearing, open type 

Cam follower 

Cam follower, shaft eccentric type 

Cam follower, full complement roller type 

Cam follower, full complement roller and shaft eccentric type 

MI 

MR 

NA22 

NA48 

NA49 

NA59 

NA69 

NA49S 

NAO 

NATR 

NATV 

NIP 

NK 

NKIA59 

NKIB59 

NKX 

NKXZ 

NKXR 

NKXRZ 

NUKR 

NUTR2 

NUTR33 

NUTW 

PK 

RF 

RLM 

RNA22 

RNA48 

RNA49 

RNA59 

RNA69 

RNA49S 

RNAB2 

RNAO 

WR 

WS811 

WS812 

WS893 

Inner ring, inch series 

Machined ring needle roller bearing without inner ring, inch series 

Roller follower with inner ring, dimension series 22 

Machined ring needle roller bearing with inner ring, dimension series 48 




Clearance-adjustable needle roller bearing with inner ring 

Machined ring needle roller bearing, separable type, with inner ring 

Roller follower 

Roller follower, full complement roller type 

Grease nipple 

Machined ring needle roller bearing without inner ring 

Complex bearing : Needle roller bearing with angular ball bearing 

dimension series 59 Complex bearing 

Needle roller bearing with three-point contact type ball bearing 

dimension series 59 

Complex bearing : needle roller bearing with thrust ball bearing 

without dust-proof cover 

Complex bearing: Needle roller bearing with thrust ball bearing 

with dust-proof cover 

Complex bearing: Needle roller bearing with thrust cylindrical roller bearing 

without dust-proof cover 

Complex bearing: Needle roller bearing with thrust cylindrical roller bearing 

with dust-proof cover 

Cam follower, full complement roller type 

Roller follower, diameter series 2 

Roller follower, diameter series 3 

Roller follower outer ring, middle rib type 

Needle roller and cage assembly 

Polyamide resin cage for linear flat rollers 

Linear roller bearing 

Roller follower without inner ring, dimension series 22 

Machined ring needle roller bearing without inner ring, dimension series 48 




Clearance-adjustable needle roller bearing, without inner ring 

Open type roller follower without inner ring, diameter series 2 

Machined ring needle roller bearing, separable type, without inner ring 

Snap ring for shaft 

Thrust inner ring, dimension series 11 



A-57

Bearing Type Symbols and Auxiliary Symbols 

NTN 

Table 1.2.2 Auxiliary symbols 

Symbol 

Symbol representation 

Initial symbols 

Material 

heat-treatment 

symbols 

TS- 

M- 

E- 

F- 

H- 

C- 

Bearing for high temperature application which was 

heat-treated for dimensional stabilization 

Plated bearing 

Bearing made of case-hardened steel 

Bearing made of stainless steel 

Bearing made of high speed steel 

Bearing made of carbon steel 

Expansion compensation 

EC- 

Expansion-compensated bearing 

Basic symbols 

Internal construction 

symbols 

ZW 

A,B,C 

Double-row cage 

Internal construction change 

Cage symbols 

J 

F1 

L1 

T2 

L3 

L5 

S 

Steel plate punched cage 

Machined iron cage 

High-strengh yellow copper cage 

Polyamide resin cage 

Aluminum alloy cage 

Sintered alloy cage 

Welded cage 

Seal symbols 

L,LL 

P,PP 

With synthetic rubber seal 

With plastic seal 

Tail codes 

Bearing ring profile 

symbols 

K 

N 

NR 

W 

D 

D1 

H 

Bearing with 1/12 tapered bore 

Grooved snap ring 

With snap ring 

Bearing ring with notched knock hole 

With oil hole 

With oil hole and oil groove 

Cam follower with hexagon hole 

Combination symbols 

D2,Dn 

+ 

-P 

Complex bearing using two or more same bearings 

With spacer 

Without cross roller stud 

Clearance symbols 

C2 

C3 

C4 

NA 

Clearance smaller than ordinary clearance 

Clearance larger than ordinary clearance 

Radial clearance larger than C3 

Non-interchangeable clearance 

Accuracy class 

symbols 

P6 

P5 

P4 

Bearing of JIS Class-6 



Lubrication symbols 

/2A 

/3A 

SHELL ALVANIA Grease 2 

SHELL ALVANIA Grease 3 

Special symbols 

V1Vn 

Special specification, requirements 

A-58


B-003020 


for connecting rod bearings 

B-021028 


B-029052 

Needle Roller Bearings 

BEARING TABLES 


Machined-ring needle roller bearings, 

separable 

B-053096 

B-097114 

Inner rings 

B-115132 


B-133138 


B-139160 

Roller followers 

B-161173 

Cam followers 

B-174204 


B-205220 

Components 

Needle rollers / Snap rings / Seals 

B-221234 

Linear bearings 

B-235254 


B-255259 


Tension pulleys for textile machinery 

B-260266

B-2

Needle Roller and Cage Assemblies


NTN 

Needle Roller and Cage Assemblies 

This needle roller and cage assembly is one of the 

basic components for the needle roller bearing of a 

construction wherein the needle rollers are fitted with a 

cage so as not to separate from each other. The use of 

this roller and cage assembly enables to design a 

compact and lightweight construction by utilizing a shaft 

or a housing as the direct raceway surface, without using 

inner ring and outer ring. 

The needle rollers are guided by the cage more 

precisely than the full complement roller type, hence 

enabling high speed running of bearing. In addition, its 

rigidity and load capacity are high for the specific space. 

Type of 

needle roller and cage assembly 

Cage type 

Applied shaft 

diameter (mm) 

Composition of 

nominal bearing number 

Nominal 

bearing number 

Code items and 

respective dimensions 

K 

KS 

KT2 

Machined ring type 

Polyamide resin type 

Welded type 

3285 

10100 

K 20 24 10 S 

Tail code 

Width 

Roller set outer diameter 

Inscribed circle diameter 

Type code 

K202410S 

Inscribed circle 

diameter : 20 

Roller set outer 

diameter : 24 

Width : 10 

S : Welded type 

KMJ 

KMJS 

PCJ 

Punched type 

Welded type 

15100 

1040 

KMJ 20 26 13 

Width 



Type code 

KMJ202613 


diameter : 20 


diameter : 26 

Width : 13 

KJS 

Welded type 

2040 

KJ 30 35 17 S 

Tail code 

Width 



Type code 

KJ303517S 


diameter : 30 


diameter : 35 

Width : 17 


KVS 

Welded type 

7100 

KV 30 35 17 S 

Tail code 

Width 



Type code 

KV303517S 


diameter : 30 


diameter : 35 

Width : 17 


KZW 


8285 

K 20 24 45 ZW 

Tail code 

Width 



Type code 

K202445ZW 


diameter : 20 


diameter : 24 

Width : 45 

ZW : Double-row type 

GK 


Split type 

8285 

GK 30 35 17 

Width 



Type code 

GK303517 


diameter : 30 


diameter : 35 

Width : 17 

The ones with tail code T2 using polyamide resin cage shall be used at allowable temperature 120˚C and, under continuous running, at 100˚C or less. 

The applied shaft diameter of welded type are described based on size that manufacturers can deal with a manufacturing. Therefore, it has nothing to do with the Demention Table. 

B-4


NTN 

Inter-roller diameter deviation of needle rollers 

Inter-roller diameter deviation of needle rollers which 

are built in one cage is within 2um. The respective 

specified diameter tolerances for built-in needle rollers 

are identified by identification colors on the package label, 

as shown in Table 1. 

The standard identification colors marked on each label 

are red, dark blue, blue, black and white, unless 

otherwise specially indicated. 

Where two or more bearings are used in tandem, those 

of same identification color must be used for equal 

distribution of bearing load. 

Table 1 Color identification of diameter tolerances for needle roller bearings 

Identification color on label Diameter tolerance m Classification 

Shaft and housing specifications 

Where a shaft and a housing are used as the direct 

raceway surface, the raceway surface must meet the 

specifications described in Table 3. 

Table 3 Shaft and housing specifications 

Characteristics 

Roundness (max) 

Cylindricality (max) 

Surface roughness (max) 

Surface hardness 

Depth of hardened layer (min) 

Shaft 

Housing 

IT3 

IT4 

IT3 

IT4 

Refer to Table 7.4 on page A-39. 

HRC5864 

Refer to formula (7.1) on page A-39 

Red 

Dark blue 

Blue 

Black 

White 

Gray 

Green 

Brown 

Yellow 

0 2 

1 3 

2 4 

3 5 

4 6 

5 7 

6 8 

7 9 

810 

Standard 

Semi-standard 

Bearing installation related dimensions 

The tolerances for the nominal dimension "Bc" of cage 

specified in Table 4 are recommended as the guide width 

b of cage. 

Table 4 Guide width tolerances 

Unit : mm 

Tolerances for guide width b 

Classification 

Single row Double row 

Metric system 

Bc 0.2 

0 

Bc 0.3 

0.1 

Radial Clearance 

Inch system 

Bc 0.4 

0.2 

Bc 0.5 

0.3 

When a shaft and a housing are used as the direct 

raceway surface, the radial clearance is determined by 

the shaft diameter and the housing hole dimension. 

Where the diameter tolerances for needle rollers are 

standard (tolerances color-identified in red, dark blue, 

blue, black, white), the shaft diameters and housing hole 

dimensions shown in Table 2 are used. 

b 

Bc 

Table 2 Recommended fits 

Shaft diameter mm 

Smaller than ordinary clearance 

Radial 

Ordinary clearance 

clearance 

Larger than ordinary clearance 

80 

j5/G6 

h5/G6 

g6/G6 

80140 

h5/G6 

g5/G6 

f6/G6 

140 

h5/G6 

f5/H6 

f6/G6 

Shaft guide 

b 

Bc 

 

Housing guide 

Fig. 1 

B-5


NTN 

Type K 

Type KT2 

Type KS 

Type KZW 

Type KMJ 

BC 

BC 

EW 

FW 

EW 

FW 

Type K 

Type KT2 

Type KS 

Type KZW 

FW 

312mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing numbers Mass 

dynamic static dynamic static 

mm N kgf r/min kg 

grease oil 

Fw Ew Bc Cr Cor Cr Cor (approx.) 

3 6 7 0.2 

0.55 1 460 970 149 99 33 000 50 000 K367T2 0.0004 

4 7 

0.2 

7 0.55 1 770 1 270 180 129 30 000 45 000 K477T2 0.0005 

5 

8 8 0.2 2 640 2 190 269 224 27 000 40 000 K588T2 0.0007 

8 

0.55 

10 2 720 2 250 277 230 27 000 40 000 K5810T2 0.0009 

9 8 2 660 2 280 272 233 25 000 37 000 K698T2 0.0009 

6 9 

0.2 

10 0.55 3 400 3 150 345 320 25 000 37 000 K6910T2 0.0011 

10 13 4 400 3 700 450 380 25 000 37 000 K61013T2 0.0019 

7 

8 

9 

10 8 0.2 2 670 2 350 272 239 23 000 34 000 K7108T2 0.0009 

10 

0.55 

10 3 400 3 200 345 330 23 000 34 000 K71010T2 0.0011 

11 8 3 150 3 000 320 305 21 000 32 000 K8118T2 0.0011 

11 10 4 000 4 100 410 420 21 000 32 000 K81110T2 0.0013 

11 13 0.2 4 850 5 200 495 535 21 000 32 000 K81113 0.0026 

12 

0.55 

10 4 650 4 150 475 425 21 000 32 000 K81210T2 0.0020 

12 12 5 600 5 300 570 540 21 000 32 000 K81212 0.0034 

12 13 5 600 5 300 570 540 21 000 32 000 K81213 0.0036 

12 10 0.2 4 550 5 000 465 510 20 000 30 000 K91210T2 0.0015 

12 

0.55 

13 5 500 6 400 560 650 20 000 30 000 K91213T2 0.0021 

10 

13 10 4 550 5 100 460 520 19 000 28 000 K101310T2 0.0016 

13 13 5 450 6 450 555 660 19 000 28 000 K101313 0.0031 

14 8 0.2 4 300 3 950 435 405 19 000 28 000 K10148 0.0027 

14 

0.55 

10 5 500 5 450 560 555 19 000 28 000 K101410 0.0034 

14 13 6 600 6 900 675 705 19 000 28 000 K101413 0.0044 

16 12 7 100 5 950 720 610 19 000 28 000 K101612 0.0066 

0.2 

11 14 10 0.55 5 050 6 000 515 615 18 000 27 000 K111410 0.0028 

15 9 4 450 5 250 455 535 17 000 26 000 K12159 0.0027 

15 10 5 000 6 100 510 620 17 000 26 000 K121510S 0.0033 

12 15 

0.2 

13 0.55 6 000 7 700 615 785 17 000 26 000 K121513 0.0038 

15 20 8 550 12 200 875 1 240 17 000 26 000 K121520ZW 0.0059 

16 8 4 850 4 900 495 500 17 000 26 000 K12168 0.0034 

Remarks: Even when an order is placed with reference to “Nominal bearing number” listed in this table, the ordered bearings are subject to being delivered with 

different cage type. 

B-6


NTN 

BC 

EW 

FW 

Type KMJ 

FW 

1216mm 




grease oil 


16 13 7 500 8 500 765 870 17 000 26 000 K121613 0.0055 

12 17 

0.2 

13 0.55 9 000 9 400 920 960 17 000 26 000 K121713 0.0075 

18 12 8 650 8 000 880 815 17 000 26 000 K121812 0.0084 

14 

17 10 5 400 7 050 550 720 16 000 24 000 K141710 0.0033 

18 10 6 900 8 000 705 815 16 000 24 000 K141810 0.0046 

18 11 7 600 9 050 775 925 16 000 24 000 K141811 0.0053 

18 13 8 300 10 100 845 1 030 16 000 24 000 K141813 0.0063 

18 15 0.2 9 650 12 300 985 1 250 16 000 24 000 K141815S 0.0076 

18 

0.55 

17 10 900 14 400 1 120 1 470 16 000 24 000 K141817 0.0081 

18 39 18 800 28 900 1 910 2 950 16 000 24 000 K141839ZW 0.0180 

19 13 8 950 9 650 915 985 16 000 24 000 K141913 0.0080 

20 12 9 350 9 150 955 930 16 000 24 000 K142012 0.0095 

20 17 13 500 14 600 1 370 1 490 16 000 24 000 K142017 0.0140 

18 14 7 850 11 600 800 1 190 15 000 23 000 K151814 0.0060 

19 10 6 850 8 050 700 820 15 000 23 000 K151910S 0.0051 

19 13 8 250 10 200 840 1 040 15 000 23 000 K151913S 0.0067 

19 17 10 900 14 600 1 110 1 490 15 000 23 000 K151917 0.0090 

15 19 

0.2 

24 0.55 14 100 20 400 1 440 2 080 15 000 23 000 K151924ZW 0.0130 

20 13 10 100 11 500 1 030 1 170 15 000 23 000 K152013 0.0088 

21 15 11 900 12 500 1 210 1 280 15 000 23 000 K152115 0.0130 

21 17 15 100 17 200 1 540 1 750 15 000 23 000 KMJ152117 0.0140 

21 21 16 500 19 100 1 680 1 950 15 000 23 000 K152121 0.0170 

16 

20 10 7 500 9 250 765 945 15 000 23 000 K162010 0.0057 

20 11 8 300 10 500 845 1 070 15 000 23 000 K162011 0.0061 

20 13 9 050 11 800 925 1 200 15 000 23 000 K162013 0.0071 

20 17 

0.2 11 900 16 800 1 220 1 710 15 000 23 000 K162017S 0.0092 

22 12 0.55 

11 700 12 500 1 190 1 280 15 000 23 000 K162212 0.0100 

22 13 12 600 13 900 1 290 1 410 15 000 23 000 KMJ162213 0.0110 

22 16 14 200 16 100 1 450 1 650 15 000 23 000 KMJ162216 0.0140 

22 17 14 400 16 400 1 470 1 670 15 000 23 000 K162217 0.0150 



B-7


NTN 

Type K 

Type KS 

Type KZW 

Type KMJ 

Type KMJS 

BC 

BC 

EW 

FW 

EW 

FW 

Type K 

Type KS 

Type KZW 

FW 

1620mm 




grease oil 


0.2 

16 22 20 0.55 16 000 18 800 1 640 1 920 15 000 23 000 K162220 0.0170 

17 

21 10 7 450 9 300 760 950 15 000 22 000 K172110S 0.0056 

21 13 9 400 12 600 960 1 280 15 000 22 000 K172113S 0.0075 

21 15 0.2 10 400 14 400 1 060 1 460 15 000 22 000 K172115 0.0089 

21 

0.55 

17 11 800 16 900 1 210 1 720 15 000 22 000 K172117 0.0095 

22 20 14 700 19 200 1 500 1 960 15 000 22 000 K172220 0.0150 

23 17 14 400 16 500 1 460 1 690 15 000 22 000 K172317 0.0160 

18 

19 

22 10 7 400 9 400 755 955 14 000 21 000 K182210 0.0061 

22 13 8 900 11 900 910 1 210 14 000 21 000 K182213 0.0077 

22 17 11 700 17 000 1 200 1 730 14 000 21 000 K182217 0.0110 

23 20 14 600 19 300 1 490 1 970 14 000 21 000 K182320S 0.0150 

24 12 0.2 12 300 13 800 1 250 1 410 14 000 21 000 K182412 0.0120 

24 

0.55 

13 11 600 12 800 1 180 1 300 14 000 21 000 K182413 0.0130 

24 17 16 000 19 300 1 630 1 970 14 000 21 000 KMJ182417S 0.0140 

24 20 17 000 20 900 1 730 2 130 14 000 21 000 K182420 0.0190 

25 17 18 000 20 400 1 830 2 080 14 000 21 000 K182517 0.0190 

25 22 22 100 26 600 2 250 2 710 14 000 21 000 K182522 0.0240 

23 13 0.2 9 650 13 500 985 1 370 14 000 21 000 K192313 0.0082 

23 

0.55 

17 12 700 19 200 1 300 1 960 14 000 21 000 K192317 0.0110 

24 10 8 300 11 200 845 1 150 13 000 20 000 K202410S 0.0065 

24 11 9 500 13 400 970 1 370 13 000 20 000 K202411 0.0072 

24 13 10 000 14 300 1 020 1 460 13 000 20 000 K202413S 0.0086 

24 17 13 200 20 400 1 340 2 080 13 000 20 000 K202417S 0.0110 

24 45 16 400 27 100 1 680 2 760 13 000 20 000 K202445ZW 0.0280 

20 25 

0.2 

40 0.55 29 000 48 000 2 950 4 900 13 000 20 000 K202540ZW 0.0330 

26 12 12 900 15 100 1 320 1 540 13 000 20 000 K202612 0.0130 

26 13 14 000 16 700 1 420 1 700 13 000 20 000 KMJ202613 0.0120 

26 17 17 800 22 800 1 810 2 330 13 000 20 000 KMJ202617S 0.0160 

26 20 20 600 27 600 2 100 2 820 13 000 20 000 KMJ202620S 0.0190 

28 25 27 100 32 500 2 760 3 300 13 000 20 000 K202825 0.0370 



B-8


NTN 

BC 

EW 

FW 

Type KMJ 

Type KMJS 

FW 

2125mm 




grease oil 


21 

25 13 

0.2 10 300 15 100 1 050 1 540 13 000 19 000 K212513 0.0090 

25 17 0.55 

13 600 21 500 1 380 2 200 13 000 19 000 K212517 0.0120 

26 10 8 500 11 900 865 1 220 12 000 18 000 K222610S 0.0071 

26 11 10 100 14 900 1 030 1 520 12 000 18 000 K222611S 0.0079 

26 13 10 200 15 200 1 040 1 550 12 000 18 000 K222613 0.0094 

26 17 13 500 21 600 1 370 2 200 12 000 18 000 K222617S 0.0120 

22 27 

0.2 

20 0.55 17 500 25 900 1 780 2 640 12 000 18 000 K222720 0.0200 

27 40 29 900 51 500 3 050 5 250 12 000 18 000 K222740ZW 0.0390 

28 17 17 700 23 300 1 810 2 380 12 000 18 000 K222817 0.0200 

29 16 18 700 22 700 1 910 2 310 12 000 18 000 KMJ222916 0.0220 

30 15 19 300 21 700 1 970 2 210 12 000 18 000 K223015 0.0220 

23 28 

0.2 

24 0.55 19 800 31 000 2 020 3 150 11 000 17 000 K232824 0.0230 

28 10 9 000 13 200 915 1 350 11 000 17 000 K242810S 0.0081 

28 13 10 800 16 800 1 100 1 710 11 000 17 000 K242813 0.0100 

24 

28 17 0.2 14 300 23 900 1 460 2 440 11 000 17 000 K242817 0.0130 

29 

0.55 

13 12 300 16 900 1 250 1 720 11 000 17 000 K242913 0.0120 

30 17 18 400 25 200 1 880 2 570 11 000 17 000 K243017 0.0220 

30 31 27 900 43 000 2 840 4 350 11 000 17 000 K243031ZW 0.0390 

25 

29 10 8 950 13 300 910 1 350 11 000 16 000 K252910 0.0083 

29 13 10 800 16 900 1 100 1 720 11 000 16 000 K252913 0.0100 

29 17 14 200 24 000 1 450 2 450 11 000 16 000 K252917S 0.0140 

30 13 13 200 18 800 1 350 1 920 11 000 16 000 K253013 0.0130 

30 17 17 400 26 800 1 770 2 730 11 000 16 000 K253017S 0.0170 

30 20 0.2 19 400 31 000 1 980 3 150 11 000 16 000 K253020S 0.0210 

30 

0.55 

26 21 800 35 500 2 220 3 650 11 000 16 000 K253026ZW 0.0270 

30 39 29 800 53 500 3 050 5 450 11 000 16 000 K253039ZW 0.0400 

31 13 15 200 19 900 1 550 2 030 11 000 16 000 K253113 0.0160 

31 14 16 500 22 100 1 680 2 250 11 000 16 000 K253114 0.0180 

31 17 18 300 25 300 1 870 2 580 11 000 16 000 K253117 0.0220 

31 21 22 500 33 000 2 290 3 350 11 000 16 000 K253121 0.0260 



B-9


NTN 

Type K 

Type KS 

Type KZW 

Type KMJ 

Type KMJS 

Type KJS 

EW 

BC 

FW 

EW 

BC 

FW 

Type K 

Type KS 

Type KZW 

FW 

2532mm 




grease oil 


25 

32 16 0.2 19 500 24 700 1 990 2 520 11 000 16 000 KMJ253216 0.025 

33 24 0.55 

34 500 47 000 3 500 4 800 11 000 16 000 KMJ253324S 0.040 

30 13 11 800 19 200 1 200 1 960 10 000 15 000 K263013 0.011 

26 30 

0.2 

17 0.55 15 500 27 400 1 580 2 790 10 000 15 000 K263017 0.015 

34 22 24 200 30 000 2 470 3 050 10 000 15 000 K263422 0.041 

28 

29 

32 17 15 300 27 500 1 560 2 810 9 500 14 000 K283217 0.017 

32 21 18 700 35 500 1 910 3 650 9 500 14 000 K283221 0.020 

33 13 13 900 20 900 1 420 2 130 9 500 14 000 K283313 0.015 

33 17 18 300 29 800 1 870 3 050 9 500 14 000 K283317S 0.020 

33 26 0.2 23 900 42 000 2 430 4 250 9 500 14 000 K283326ZW 0.033 

33 

0.55 

27 28 300 52 000 2 890 5 300 9 500 14 000 K283327 0.032 

34 14 17 500 24 800 1 790 2 530 9 500 14 000 K283414 0.020 

34 17 18 100 25 800 1 850 2 630 9 500 14 000 K283417 0.024 

35 16 21 200 28 400 2 160 2 900 9 500 14 000 K283516 0.029 

35 18 21 500 28 900 2 190 2 950 9 500 14 000 K283518 0.031 

34 17 0.2 18 900 31 000 1 920 3 200 9 500 14 000 K293417S 0.022 

34 

0.55 

27 28 100 52 000 2 870 5 300 9 500 14 000 K293427 0.033 

35 11 12 200 18 000 1 240 1 840 8 500 13 000 K303511S 0.014 

35 13 14 700 22 900 1 500 2 340 8 500 13 000 K303513S 0.016 

35 17 19 400 32 500 1 970 3 350 8 500 13 000 KJ303517S 0.021 

35 20 21 600 37 500 2 200 3 850 8 500 13 000 K303520S 0.025 

35 26 25 200 46 000 2 570 4 650 8 500 13 000 K303526ZW 0.032 

30 

35 27 0.2 29 900 57 000 3 050 5 800 8 500 13 000 K303527S 0.033 

36 

0.55 

14 18 600 27 400 1 900 2 790 8 500 13 000 KMJ303614 0.022 

37 16 21 900 30 500 2 230 3 100 8 500 13 000 K303716 0.029 

37 18 23 300 33 000 2 370 3 350 8 500 13 000 K303718 0.034 

37 20 26 200 38 000 2 670 3 850 8 500 13 000 KMJ303720 0.038 

37 48 40 000 65 500 4 050 6 700 8 500 13 000 K303748ZW 0.075 

38 18 25 000 33 000 2 550 3 350 8 500 13 000 K303818 0.036 

32 36 

0.2 

15 0.55 14 300 26 400 1 460 2 700 8 500 13 000 K323615S 0.017 



B-10


NTN 

BC 

BC 

EW 

FW 

EW 

FW 

Type KMJ 

Type KMJS 

Type KJS 

FW 

3238mm 




grease oil 


32 

37 13 14 500 23 000 1 480 2 350 8 500 13 000 K323713 0.018 

37 17 19 200 33 000 1 950 3 350 8 500 13 000 K323717S 0.022 

37 26 24 900 46 000 2 540 4 700 8 500 13 000 K323726ZW 0.034 

37 27 29 600 57 500 3 000 5 850 8 500 13 000 KJ323727S 0.037 

38 14 

0.2 19 800 30 500 2 020 3 100 8 500 13 000 KMJ323814 0.022 

38 20 0.55 

25 100 41 000 2 560 4 150 8 500 13 000 KJ323820S 0.031 

38 26 31 500 54 000 3 200 5 550 8 500 13 000 K323826 0.041 

39 16 22 600 32 000 2 310 3 300 8 500 13 000 K323916 0.034 

39 18 24 000 35 000 2 450 3 550 8 500 13 000 K323918 0.037 

39 20 26 800 40 000 2 740 4 100 8 500 13 000 KJ323920S 0.041 

40 13 15 200 25 100 1 550 2 560 7 500 11 000 K354013 0.019 

40 17 20 000 36 000 2 040 3 650 7 500 11 000 K354017 0.025 

40 26 26 100 50 000 2 660 5 100 7 500 11 000 K354026ZW 0.037 

40 27 32 000 65 000 3 250 6 600 7 500 11 000 KJ354027S 0.039 

40 30 26 100 50 000 2 660 5 100 7 500 11 000 K354030ZW 0.043 

41 14 19 400 30 500 1 980 3 100 7 500 11 000 K354114 0.026 

35 41 

0.2 

15 0.55 20 900 33 500 2 130 3 400 7 500 11 000 K354115 0.027 

41 40 43 000 84 000 4 400 8 550 7 500 11 000 K354140ZW 0.055 

42 16 24 100 36 000 2 450 3 650 7 500 11 000 K354216 0.035 

42 18 24 700 37 000 2 510 3 750 7 500 11 000 K354218 0.039 

42 20 28 500 44 500 2 910 4 550 7 500 11 000 K354220 0.041 

42 30 39 500 68 000 4 050 6 950 7 500 11 000 K354230 0.062 

42 45 42 500 74 000 4 300 7 550 7 500 11 000 K354245ZW 0.106 

36 42 

0.2 

46 0.55 51 000 106 000 5 200 10 800 7 500 11 000 K364246ZW 0.086 

42 13 15 900 27 100 1 620 2 770 7 500 11 000 K374213 0.021 

37 

42 17 0.2 20 400 37 500 2 080 3 800 7 500 11 000 KJ374217S 0.026 

42 

0.55 

27 32 500 67 500 3 300 6 900 7 500 11 000 KJ374227S 0.041 

44 18 26 300 41 000 2 680 4 150 7 500 11 000 K374418 0.042 

38 

43 17 0.2 20 900 38 500 2 130 3 950 7 500 11 000 K384317 0.026 

43 

0.55 

27 32 000 67 500 3 300 6 900 7 500 11 000 K384327 0.043 



B-11


NTN 

Type K 

Type KZW 

Type KMJ 

Type KJS 

BC 

BC 

EW 

FW 

EW 

FW 

Type K 

Type KZW 

FW 

3848mm 




grease oil 


38 

46 20 

0.2 34 000 52 000 3 450 5 350 7 500 11 000 KMJ384620 0.046 

46 32 0.55 

54 000 95 500 5 500 9 700 7 500 11 000 K384632 0.073 

45 13 16 500 29 200 1 680 2 980 6 500 10 000 K404513 0.022 

45 17 21 800 41 500 2 220 4 250 6 500 10 000 K404517 0.027 

45 21 26 700 54 000 2 720 5 500 6 500 10 000 K404521 0.037 

45 27 33 500 72 500 3 400 7 400 6 500 10 000 K404527 0.044 

40 46 

0.2 

17 0.55 24 600 43 000 2 500 4 350 6 500 10 000 K404617 0.030 

47 18 27 700 45 000 2 820 4 550 6 500 10 000 K404718 0.045 

47 20 31 000 51 500 3 150 5 250 6 500 10 000 K404720 0.048 

48 20 33 000 51 000 3 350 5 200 6 500 10 000 K404820 0.052 

48 25 42 500 71 000 4 350 7 250 6 500 10 000 K404825 0.065 

42 

47 17 22 100 43 000 2 250 4 400 6 500 9 500 K424717 0.028 

47 27 0.2 34 000 75 500 3 450 7 700 6 500 9 500 K424727 0.047 

48 

0.55 

17 25 700 46 000 2 630 4 700 6 500 9 500 K424817 0.036 

50 20 34 000 53 500 3 450 5 500 6 500 9 500 K425020 0.054 

48 17 22 000 43 000 2 240 4 400 6 500 9 500 K434817 0.029 

43 48 

0.2 

27 0.55 34 000 75 500 3 450 7 700 6 500 9 500 K434827 0.046 

50 18 29 100 49 000 2 960 5 000 6 500 9 500 K435018 0.049 

45 

49 19 22 100 52 000 2 260 5 300 6 000 9 000 K454919 0.027 

50 17 22 800 46 000 2 330 4 700 6 000 9 000 KJ455017S 0.031 

50 27 34 500 78 000 3 500 7 950 6 000 9 000 K455027 0.050 

52 18 0.2 29 700 51 000 3 000 5 200 6 000 9 000 K455218 0.051 

52 

0.55 

21 32 000 56 500 3 300 5 750 6 000 9 000 K455221 0.061 

53 20 36 000 59 000 3 650 6 000 6 000 9 000 K455320 0.062 

53 25 46 500 82 000 4 700 8 400 6 000 9 000 K455325 0.077 

53 28 49 500 90 000 5 050 9 200 6 000 9 000 KJ455328S 0.078 

52 17 0.2 23 200 47 500 2 360 4 850 5 500 8 500 K475217 0.033 

47 

0.55 

52 27 35 500 83 000 3 650 8 450 5 500 8 500 K475227 0.051 

0.2 

48 53 37.5 0.55 41 500 101 000 4 200 10 300 5 500 8 500 K485337.5ZW 0.072 



B-12


NTN 

BC 

BC 

BC 

EW 

FW 

EW 

FW 

EW 

FW 

Type KMJ Type KJS Type KVS 

FW 

4860mm 




grease oil 


48 54 19 0.2 

31 000 61 000 3 150 6 250 5 500 8 500 K485419 0.044 

0.55 

55 13.5 18 100 35 500 1 850 3 600 5 500 8 000 K505513.5 0.023 

55 20 27 900 62 000 2 850 6 300 5 500 8 000 K505520 0.042 

55 27 37 000 88 500 3 750 9 000 5 500 8 000 K505527 0.053 

50 55 

0.2 

30 0.55 39 500 97 000 4 050 9 900 5 500 8 000 K505530 0.059 

57 18 31 500 57 000 3 200 5 800 5 500 8 000 K505718 0.053 

58 20 38 500 67 500 3 950 6 850 5 500 8 000 K505820 0.065 

58 25 48 500 90 000 4 950 9 150 5 500 8 000 K505825 0.081 

0.2 

52 58 19 0.55 32 000 65 500 3 250 6 650 5 000 7 500 K525819 0.048 

55 

60 17 25 800 58 000 2 630 5 900 5 000 7 500 K556017 0.043 

60 20 28 800 66 500 2 940 6 750 5 000 7 500 K556020 0.045 

60 30 42 000 108 000 4 300 11 000 5 000 7 500 KV556030S 0.069 

61 19 33 000 69 500 3 350 7 100 5 000 7 500 K556119 0.051 

61 20 0.2 33 000 69 500 3 350 7 100 5 000 7 500 K556120 0.054 

61 

0.55 

30 48 000 113 000 4 900 11 500 5 000 7 500 K556130 0.081 

62 18 33 500 63 000 3 400 6 450 5 000 7 500 K556218 0.054 

63 20 39 000 70 000 3 950 7 100 5 000 7 500 K556320 0.073 

63 25 50 500 97 500 5 150 9 950 5 000 7 500 K556325 0.088 

63 32 61 000 125 000 6 200 12 700 5 000 7 500 K556332 0.117 

0.2 

58 64 19 0.55 34 000 73 500 3 450 7 500 4 700 7 000 K586419 0.052 

60 

65 20 29 800 71 500 3 050 7 300 4 300 6 500 K606520 0.051 

65 30 43 500 116 000 4 450 11 800 4 300 6 500 K606530 0.071 

66 19 33 500 73 500 3 450 7 500 4 300 6 500 K606619 0.053 

66 20 33 500 73 500 3 450 7 500 4 300 6 500 K606620 0.056 

66 30 0.2 49 000 119 000 5 000 12 200 4 300 6 500 K606630 0.084 

68 

0.55 

15 27 200 45 500 2 780 4 650 4 300 6 500 K606815 0.058 

68 20 40 000 75 000 4 100 7 650 4 300 6 500 K606820 0.077 

68 23 44 500 85 000 4 500 8 700 4 300 6 500 K606823 0.092 

68 25 52 000 105 000 5 300 10 700 4 300 6 500 K606825 0.097 

68 27 52 000 105 000 5 300 10 700 4 300 6 500 K606827 0.098 



B-13


NTN 

Type K 

Type KZW 

Type KMJ 

BC 

BC 

EW 

FW 

EW 

FW 

Type K 

Type KZW 

FW 

6080mm 




grease oil 


60 68 30 0.2 

46 500 91 000 4 750 9 300 4 300 6 500 K606830ZW 0.119 

0.55 

61 

66 20 0.2 29 700 71 500 3 050 7 300 4 300 6 500 K616620 0.054 

66 

0.55 

30 43 500 116 000 4 400 11 900 4 300 6 500 K616630 0.073 

63 70 

0.2 

21 0.55 44 500 95 500 4 500 9 700 4 300 6 500 K637021 0.075 

64 70 

0.2 

16 0.55 28 400 60 500 2 900 6 150 4 300 6 500 K647016 0.053 

65 

70 20 30 500 75 000 3 100 7 650 4 000 6 000 K657020 0.055 

70 30 0.2 45 000 124 000 4 600 12 700 4 000 6 000 K657030 0.083 

73 

0.55 

23 47 000 94 000 4 800 9 600 4 000 6 000 K657323 0.100 

73 30 61 000 132 000 6 200 13 400 4 000 6 000 K657330 0.126 

68 

74 20 36 000 83 500 3 700 8 550 4 000 6 000 K687420 0.065 

74 30 0.2 51 500 133 000 5 250 13 500 4 000 6 000 K687430 0.097 

74 

0.55 

35 49 500 125 000 5 050 12 800 4 000 6 000 K687435ZW 0.116 

75 21 45 500 101 000 4 600 10 300 4 000 6 000 K687521 0.077 

76 20 36 500 86 000 3 700 8 750 3 700 5 500 K707620 0.070 

76 30 53 000 139 000 5 400 14 200 3 700 5 500 K707630 0.100 

70 77 

0.2 

21 0.55 45 000 101 000 4 600 10 300 3 700 5 500 K707721 0.080 

78 23 49 500 103 000 5 050 10 500 3 700 5 500 K707823 0.107 

78 30 65 500 149 000 6 700 15 200 3 700 5 500 K707830 0.136 

72 79 

0.2 

21 0.55 46 500 106 000 4 750 10 800 3 700 5 500 K727921 0.085 

73 

79 20 0.2 39 500 95 500 4 000 9 750 3 700 5 500 KMJ737920 0.063 

79 

0.55 

30 54 500 146 000 5 550 14 900 3 700 5 500 K737930 0.106 

81 20 40 500 100 000 4 100 10 200 3 700 5 500 KMJ758120 0.064 

81 30 56 000 152 000 5 700 15 500 3 700 5 500 K758130 0.108 

75 82 

0.2 

21 0.55 46 000 106 000 4 700 10 800 3 700 5 500 K758221 0.088 

83 23 50 500 109 000 5 150 11 100 3 700 5 500 K758323 0.113 

83 30 67 500 157 000 6 850 16 100 3 700 5 500 K758330 0.147 

80 

86 20 0.2 39 000 98 000 4 000 10 000 3 300 5 000 K808620 0.077 

86 

0.55 

30 57 000 159 000 5 800 16 200 3 300 5 000 K808630 0.110 



B-14


NTN 

BC 

BC 

EW 

FW 

EW 

FW 

Type KMJ 

Type KVS 

FW 

80120mm 




grease oil 


88 23 53 000 118 000 5 400 12 100 3 300 5 000 K808823 0.125 

80 88 26 0.2 

0.55 61 000 142 000 6 250 14 500 3 300 5 000 K808826 0.131 

88 30 69 000 166 000 7 050 17 000 3 300 5 000 K808830 0.157 

85 

92 20 47 500 115 000 4 850 11 700 3 100 4 700 KMJ859220 0.083 

92 30 0.2 66 000 176 000 6 750 18 000 3 100 4 700 K859230 0.142 

93 

0.55 

27 64 000 153 000 6 500 15 600 3 100 4 700 K859327 0.145 

93 30 71 000 175 000 7 200 17 900 3 100 4 700 K859330 0.160 

97 20 46 000 113 000 4 700 11 500 2 900 4 400 K909720 0.103 

97 30 67 500 184 000 6 850 18 700 2 900 4 400 K909730 0.151 

90 98 

0.2 

26 0.55 64 000 157 000 6 550 16 000 2 900 4 400 K909826 0.148 

98 27 64 000 157 000 6 550 16 000 2 900 4 400 K909827 0.150 

98 30 72 500 184 000 7 400 18 800 2 900 4 400 K909830 0.172 

95 

100 

102 21 48 000 122 000 4 900 12 400 2 800 4 200 K9510221 0.115 

102 31 0.2 70 500 199 000 7 200 20 300 2 800 4 200 K9510231 0.172 

103 

0.55 

27 65 500 165 000 6 700 16 800 2 800 4 200 K9510327 0.159 

103 30 74 000 193 000 7 550 19 600 2 800 4 200 K9510330 0.165 

107 21 49 000 127 000 5 000 12 900 2 700 4 000 KV10010721S 0.120 

107 31 0.3 71 500 207 000 7 300 21 100 2 700 4 000 K10010731 0.173 

108 

0.65 

27 61 000 153 000 6 250 15 600 2 700 4 000 K10010827 0.176 

108 30 76 000 201 000 7 700 20 500 2 700 4 000 K10010830 0.190 

112 21 48 500 127 000 4 950 12 900 2 500 3 800 K10511221 0.130 

105 112 

0.3 

31 0.65 71 000 207 000 7 250 21 100 2 500 3 800 K10511231 0.176 

113 30 77 500 210 000 7 900 21 400 2 500 3 800 K10511330 0.198 

117 24 54 500 149 000 5 550 15 200 2 400 3 600 K11011724 0.145 

110 117 

0.3 

34 0.65 77 500 235 000 7 900 24 000 2 400 3 600 K11011734 0.205 

118 30 79 000 219 000 8 050 22 300 2 400 3 600 K11011830 0.217 

115 

123 27 0.3 64 000 170 000 6 550 17 300 2 300 3 500 K11512327 0.200 

125 

0.65 

34 95 000 241 000 9 700 24 600 2 300 3 500 K11512534 0.330 

120 127 24 0.3 

57 500 165 000 5 850 16 800 2 200 3 300 K12012724 0.160 

0.65 



B-15


NTN 

Type K 

Bc 

EW 

FW 

Type K 

FW 

120265mm 




grease oil 


120 127 34 0.3 

82 000 260 000 8 350 26 600 2 200 3 300 K12012734 0.235 

0.65 

125 

133 35 0.3 87 000 260 000 8 900 26 500 2 100 3 200 K12513335 0.275 

135 

0.65 

34 100 000 265 000 10 200 27 000 2 100 3 200 K12513534 0.350 

130 

135 

137 24 0.3 59 000 175 000 6 000 17 900 2 100 3 100 K13013724 0.170 

137 

0.65 

34 84 500 277 000 8 600 28 300 2 100 3 100 K13013734 0.240 

143 35 0.3 92 500 288 000 9 450 29 400 2 000 3 000 K13514335 0.300 

150 

0.65 

38 145 000 325 000 14 800 33 500 2 000 3 000 K13515038 0.590 

153 26 72 000 214 000 7 350 21 800 1 900 2 800 K14515326 0.250 

145 153 

0.3 

28 0.65 80 500 247 000 8 200 25 200 1 900 2 800 K14515328 0.252 

153 36 100 000 325 000 10 200 33 000 1 900 2 800 K14515336 0.335 

150 160 

0.3 

46 0.65 149 000 470 000 15 200 48 000 1 800 2 700 K15016046 0.550 

155 

163 26 0.3 73 500 224 000 7 500 22 800 1 700 2 600 K15516326 0.270 

163 

0.65 

36 102 000 340 000 10 400 34 500 1 700 2 600 K15516336 0.355 

160 170 

0.3 

46 0.65 155 000 505 000 15 800 51 500 1 700 2 500 K16017046 0.570 

173 26 79 000 251 000 8 050 25 600 1 600 2 400 K16517326 0.290 

165 173 

0.3 

32 0.65 97 000 330 000 9 900 33 500 1 600 2 400 K16517332 0.340 

173 36 109 000 380 000 11 100 39 000 1 600 2 400 K16517336 0.375 

170 180 

0.3 

46 0.65 160 000 540 000 16 400 55 000 1 600 2 400 K17018046 0.620 

175 183 

0.3 

32 0.65 101 000 350 000 10 300 35 500 1 500 2 300 K17518332 0.360 

185 195 

0.3 

37 0.65 131 000 425 000 13 300 43 500 1 500 2 200 K18519537 0.560 

195 205 

0.3 

37 0.65 135 000 450 000 13 800 46 000 1 400 2 100 K19520537 0.620 

210 220 

0.3 

42 0.65 156 000 560 000 15 900 57 000 1 300 1 900 K21022042 0.740 

220 230 

0.3 

42 0.65 161 000 590 000 16 400 60 000 1 200 1 800 K22023042 0.790 

240 250 

0.3 

42 0.65 167 000 635 000 17 000 64 500 1 100 1 700 K24025042 0.850 

265 280 

0.3 

50 0.65 256 000 850 000 26 100 87 000 1 000 1 500 K26528050 1.810 



B-16


NTN 

FW 

285mm 




grease oil 


285 300 50 268 000 930 000 27 300 94 500 950 1 400 K28530050 1.970 

0.3 

0.65 



B-17


NTN 

Inch System 

Type PCJ 

BC 

EW 

FW 

FW 

12.70063.500mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing Mass 

dynamic static dynamic static numbers 


Fw Ew Bc grease oil 

0 

0.35 0.014 

0 

 

Cr Cor Cr Cor (approx.) 

12.700(!/2) 15.875(%/8) 12.70(!/2) 6 650 8 600 680 875 16 000 24 000 PCJ081008 0.003 

19.050(#/4) 25.400(1) 25.40(1) 25 700 35 000 2 620 3 550 13 000 20 000 PCJ121616 0.023 

22.225(&/8) 28.575(1!/8) 25.40(1) 29 600 44 000 3 000 4 450 11 000 17 000 PCJ141816 0.028 

25.400(1) 

28.575(1!/8) 

33.338(1%/16) 19.05(#/4) 29 200 38 500 2 980 3 950 10 000 15 000 PCJ162112 0.032 

33.338(1%/16) 25.40(1) 38 000 54 000 3 850 5 500 10 000 15 000 PCJ162116 0.044 

38.100(1!/2) 25.40(1) 44 000 60 000 4 500 6 100 9 500 14 000 PCJ182416 0.058 

38.100(1!/2) 31.75(1!/4) 53 500 77 000 5 450 7 850 9 500 14 000 PCJ182420 0.073 

41.275(1%/8) 19.05(#/4) 35 000 46 000 3 600 4 700 8 500 13 000 PCJ202612 0.045 

31.750(1!/4) 41.275(1%/8) 25.40(1) 45 500 64 500 4 650 6 600 8 500 13 000 PCJ202616 0.062 

41.275(1%/8) 38.10(1!/2) 65 000 102 000 6 650 10 400 8 500 13 000 PCJ202624 0.096 

34.925(1#/8) 44.450(1#/4) 31.75(1!/4) 60 000 94 500 6 150 9 650 7 500 11 000 PCJ222820 0.090 

47.625(1&/8) 25.40(1) 51 000 78 500 5 200 8 000 6 500 10 000 PCJ243016 0.075 

38.100(1!/2) 47.625(1&/8) 31.75(1!/4) 62 000 101 000 6 300 10 300 6 500 10 000 PCJ243020 0.095 

47.625(1&/8) 38.10(1!/2) 72 500 124 000 7 400 12 600 6 500 10 000 PCJ243024 0.114 

53.975(2!/8) 25.40(1) 56 000 92 500 5 700 9 450 6 000 9 000 PCJ283416 0.086 

44.450(1#/4) 53.975(2!/8) 31.75(1!/4) 68 000 119 000 6 900 12 100 6 000 9 000 PCJ283420 0.110 

53.975(2!/8) 38.10(1!/2) 79 500 145 000 8 100 14 800 6 000 9 000 PCJ283424 0.132 

60.325(2#/8) 25.40(1) 58 500 102 000 5 950 10 400 5 000 7 500 PCJ323816 0.094 

50.800(2) 60.325(2#/8) 31.75(1!/4) 71 000 131 000 7 250 13 400 5 000 7 500 PCJ323820 0.120 

60.325(2#/8) 38.10(1!/2) 83 000 160 000 8 450 16 300 5 000 7 500 PCJ323824 0.144 

52.388(2!/16) 61.913(2&/16) 25.40(1) 55 000 95 500 5 600 9 750 5 000 7 500 PCJ333916 0.087 

53.975(2!/8) 

63.500(2!/2) 25.40(1) 56 500 99 500 5 750 10 200 5 000 7 500 PCJ344016 0.091 

63.500(2!/2) 38.10(1!/2) 82 000 161 000 8 350 16 400 5 000 7 500 PCJ344024 0.144 

57.150(2!/4) 66.675(2%/8) 25.40(1) 57 500 104 000 5 900 10 600 4 300 6 500 PCJ364216 0.094 

60.325(2#/8) 69.850(2#/4) 38.10(1!/2) 87 500 182 000 8 950 18 500 4 300 6 500 PCJ384424 0.161 

63.500(2!/2) 73.025(2&/8) 25.40(1) 61 500 117 000 6 250 11 900 4 000 6 000 PCJ404616 0.105 

B-18

Cage and roller type needle roller bearings 

NTN 

FW 

63.500101.600mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing Mass 



Fw Ew Bc grease oil 

0 

0.35 0.014 

0 

 


63.500(2!/2) 73.025(2&/8) 38.10(1!/2) 89 000 189 000 9 100 19 300 4 000 4 000 PCJ404624 0.167 

69.850(2#/4) 79.375(3!/8) 25.40(1) 65 000 130 000 6 650 13 200 3 700 5 500 PCJ445016 0.116 

76.200(3) 

85.725(3#/8) 25.40(1) 68 500 143 000 7 000 14 600 3 300 5 000 PCJ485416 0.127 

85.725(3#/8) 38.10(1!/2) 99 500 231 000 10 100 23 500 3 300 5 000 PCJ485424 0.201 

98.425(3&/8) 25.40(1) 75 000 169 000 7 650 17 200 2 900 4 400 PCJ566216 0.149 

88.900(3!/2) 101.600(4) 25.40(1) 82 000 154 000 8 350 15 700 2 900 4 400 PCJ566416 0.187 

101.600(4) 38.10(1!/2) 121 000 253 000 12 300 25 800 2 900 4 400 PCJ566424 0.305 

101.600(4) 

114.300(4!/2) 25.40(1) 87 500 176 000 8 950 18 000 2 500 3 800 PCJ647216 0.212 

114.300(4!/2) 38.10(1!/2) 129 000 290 000 13 200 29 500 2 500 3 800 PCJ647224 0.345 

B-19

B-20

Needle Roller and Cage Assemblies 

for connecting rod bearings

Needle roller and cage assemblies for connecting rod bearings 

NTN 

Needle Roller and Cage Assemblies for connecting rod bearings 

These needle roller and cage assemblies are 

specially designed so as to be adaptable to the 

operating environmental conditions for the connecting 

rods of small and medium reciprocal engines and 

compressors. 

The connecting rods are used under a severe 

operating condition wherein acting load magnitude and 

direction fluctuate rapidly as well as under an high 

temperature and strict lubrication environment. 

Therefore, special measures are manly undertaken for 

the cage structure, material and machining method so 

that the needle roller and cage assemblies are 

resistible to the said operating condition and 

environment. 

Type of 

needle roller and cage assembly 

Location 

Cage type 

Applied shaft 

diameter (mm) 

Composition of nominal bearing number 

PK 

PK 202613.8 1 

Tail code 

1038 

Width 



Type code 

GPK 


GPK 20 26 13.8 X 

Large end side 

1038 

Tail code 

Width 



Type code 

KMJS 

KMJ 10 14 8.8 S 

Tail code 

Welded type 

1038 

Width 



Type code 

KBK 

KBK 14 18 17 

KVS 

Small end side 


Welded type 

725 

7100 

KV 8 11 8 S V4 

Width 



Type code 

Tail code 

Tail code 

Width 



Type code 

B-22


NTN 

Nominal 


Code items and 

respective dimensions 

Remarks 

PK202613.81 

Inscribed circle diameter :20 

Roller set outer diamete r:26 

Width : 13.8 

X1 : numbering up 

Cage intended to guide outer ring, 

eventually surface- treated by nonferrous 

plating, etc. 

GPK20 26 13.8X 


Roller set outer diameter :26 

Width :13.8 



plating, etc. 

Can be applied to a crank of integral 

structure. 

KMJ10148.8 



Width :8.8 

S : welded type 



plating, etc. 

KBK141817 

V8118SV4 



Width : 17 



Width : 8 

S : welded type 

V4 : numbering up 

Type KBK is intended to guide inner 

ring, which of the guide surface is 

designed as long as possible to 

thereby reduce the surface pressure. 

In addition, the roller length is so 

designed as to be maximum against 

the width of connecting rod, for high 

load capacity. On the other hand, 

Type VS intended for outer ring 

guide needs a guide along the bore 

surface of connecting rod. 

B-23


NTN 


Table 1 shows the recommended clearance values 

though the radial clearance differs depending on bearing 

clearance, load, revolutions and ambient temperature. 

The proper radial clearance can be got by proper 

selection and combination of roller diameter, connecting 

rod hole diameter and pin diameter. Table 2 shows the 

examples of selection and combination of those. 

Table 1 Recommended clearance values 

Pin diameter 

mm 

Over incl. 

6 

10 

18 

30 

10 

18 

30 

40 


923 

1024 

1024 

1833 

Unit : m 


517 

517 

517 

 

The respective profile accuracy of connecting rod hole, 

crank and piston pin outer surfaces shall be as specified 

in Table 3. 

Furthermore, the parallelism of crank pin and piston pin 

shall be 0.02mm or less against 100mm. (Fig. 1) 

The surface roughness shall be 0.2a for connecting rod 

and 0.1a for pin outer surface as a guideline. 

Table 3 Recommended accuracy of connecting rod and pin 

Unit : m 

Parts 

Connecting 

rod 

Pin 


Pin diameter classification mm 

14 1418 1825 2530 3040 





3 

2 

2 

1 

4 

3 

2 

1 

4 

3 

3 

2 

5 

4 

3 

2 

5 

4 

4 

3 

Table 2 Radial clearance values obtainable by selection and 

combination 

Case of needle roller and cage assembly Type PK for crank pin 

Crank pin hole diameter 22mm H6 (0 to +13m) 

Crank pin diameter 14mm h5 (0 to -8m) 

Pin diameter 

sorting class 

Hole diameter 

sorting class 

Sorting class of 

needle roller used 

03 

36 

68 

04 48 813 

46 24 02 

1017 

1320 

1622 

1017 

1320 

1622 

Unit : m 

1018 

1321 

1623 

100 

0.02 

Connecting rod and pin specifications 

Connecting rod (bore surface), crank pin and piston pin 

(outer surface) can be used as direct raceway surface. 

However, these surfaces must be resistible to great load 

while maintaining high accuracy. For that, connecting 

rods and pins acting as the direct raceway surface must 

comply with the specifications specified hereunder. 

Any connecting rods shall be made of cement steel, 

e.g. chrome molybdenum steel (SCM415, etc.), nickel 

chrome molybdenum steel (SNCM420, etc.) and any 

crank pins and piston pins shall also be made of cement 

steel, e.g. chrome steel (SCr420, etc.), all of which shall 

be surface-hardened by carburizing. 

The surface hardness of each shall range from HRC58 

to 64 and adequate depth of effective carburizinghardened 

layer shall be secured up to Hv550. The depth 

of effective carburizing-hardened layer differs depending 

on actual load and pin diameter. 

Feel free to contact NTN for the more detailed 

information. 

Fig. 1 

B-24


NTN 

Regulation to connecting rod 

Two methods are available as follows to regulate axial 

motion of a connecting rod; one method is to make 

smaller a clearance between the rod and crank web at 

large end side (Method of regulating at large end side) 

and another method is to narrow a clearance between the 

rod and piston boss at the small end side (Method of 

regulating at small end side). 

In general, the method of regulation at large end side is 

mostly adopted to get accurate motion of a connecting 

rod. 

On the other hand, the method of regulation at small 

end side is adopted when regulation at large end side 

disables to secure good lubrication to the bearing and the 

guide surface at large end side due to short connecting 

rod and comparatively high revolutions. 



Fig. 2. Regulation at large end side Fig. 3 Regulation at small end side 

Regulation at large end side 

This method regulates axial motion of a connecting rod 

by forming a sliding surface between the large end of the 

connecting rod and the side face of crank web. For the 

use of this method, however, the connecting rod must be 

provided, on its bore surface, with oil hole, slot and oil 

groove to feed lubrication oil in and onto the bearing and 

guide surface at large end side. 

The crank web end face shall be surface-hardened as 

necessary or otherwise a side washer of copper alloy or 

hardened steel shall be fitted on the guide surface. 

On the other hand, the needle roller and cage 

assembly at small end side shall be guided in axial 

direction by the side face of piston boss. A great play 

shall be secured between the piston boss and the 

connecting rod. 

Regulation at small end side 

This method regulates axial motion at the small end 

face of a connecting rod and the side face of a piston rod. 

Generally a connecting rod is not provided with oil groove 

and slot to lubricate the guide surface at small end side, 

but on occasion it is surface-hardened and uses a side 

washer. 

Usually a connecting rod shall be provided with a 

through-hole (at its small end side) to lubricate the 

bearing unit. 

On the other hand, at the large end side a free 

clearance exists between the connecting rod and the 

crank web and, therefore, generally special measures 

such as oil groove to lubricate, etc. 

may be omitted. 

B-25


NTN 

For crank-pin 

Bc 

Type PK 

EW 

FW 

FW 

1030mm 

Boundary dimensions Basic load ratings Bearing numbers Mass 


mm N kgf kg 

Fw Ew Bc 

0 

0.2 


10 14 9.8 5 050 4 900 515 500 PK1014 9.8X1 0.0037 

12 

16 10 5 450 5 600 555 570 PK121610.2 0.0044 

17 9.8 6 800 6 550 695 670 PK1217 9.8X2 0.0051 

14 19 9.7 7 300 7 400 745 755 PK1419 9.7X1 0.0065 

15 

16 

18 

19 

20 9.8 7 250 7 450 740 760 PK1520 9.8X 0.0067 

21 11.8 10 000 10 200 1 020 1 040 PK152111.8X1 0.0096 

22 11.8 10 000 10 300 1 020 1 050 PK162211.8X2 0.0097 

22 13.2 10 900 11 500 1 110 1 170 PK162213.2X 0.0110 

24 11.8 11 300 12 400 1 150 1 260 PK182411.8X3 0.0110 

24 13.3 13 300 15 300 1 360 1 560 PK182413.3X1 0.0120 

24 13.9 11 900 15 200 1 220 1 550 PK192413.9X 0.0110 

25 15.8 14 300 17 000 1 460 1 730 PK192515.8X1 0.0150 

20 26 13.8 14 000 16 700 1 420 1 700 PK202613.8X6 0.0140 

22 

24 

26 

28 15.8 15 900 20 200 1 620 2 060 PK222815.8X1 0.0170 

29 17.8 18 800 22 800 1 920 2 320 PK222917.8X7 0.0240 

30 14.7 16 900 18 200 1 720 1 860 PK223014.7X2 0.0240 

30 17.8 21 900 25 400 2 230 2 590 PK223017.8X2 0.0270 

31 16.8 20 800 26 600 2 120 2 710 PK243116.8X7 0.0240 

32 19.8 22 900 27 500 2 340 2 810 PK243219.8X6 0.0330 

31 13.8 14 200 20 900 1 450 2 130 PK263113.8X2 0.0150 

34 16.8 21 600 26 100 2 200 2 660 PK263416.8X7 0.0320 

27 36 20.8 30 500 38 500 3 150 3 950 PK273620.8X1 0.0440 

28 

36 15.8 23 700 30 000 2 410 3 050 PK283615.8X6 0.0310 

37 20.8 32 500 41 500 3 300 4 250 PK283720.8X 0.0480 

29 39 21.4 32 500 39 500 3 300 4 000 PK293921.4X2 0.0550 

30 

37 15.9 21 900 30 500 2 230 3 100 PK303715.9X 0.0280 

38 15.8 24 600 32 000 2 510 3 300 PK303815.8X 0.0320 

B-26


NTN 

FW 

3038mm 



mm N kgf kg 

Fw Ew Bc 

0 

0.2 


30 38 17.8 27 700 37 500 2 820 3 800 PK303817.8X1 0.037 

31 41 21.4 34 000 43 000 3 500 4 350 PK314121.4X 0.057 

32 43 22.4 40 000 49 500 4 100 5 050 PK324322.4X 0.069 

34 42 19.8 31 500 45 500 3 200 4 650 PK344219.8X 0.046 

38 47 19.8 35 500 51 000 3 600 5 200 PK384719.8X1 0.056 

B-27


NTN 

For piston-pin 

Type KBK 

Bc 

LW 

EW 

FW 

FW 

722mm 



mm N kgf kg 

Fw Ew Bc Lw 

0 

0.2 


7 10 9.8 6.8 3 050 2 780 310 284 KBK 710 9.8X 0.0022 

8 11 11.8 8.8 4 100 4 200 415 430 KBK 81111.8X1 0.0028 

9 12 11.5 8.8 4 400 4 750 450 485 KBK 91211.7 0.0030 

14 9.8 6.8 4 500 4 200 460 430 KBK1014 9.8X 0.0042 

10 14 12.5 9.8 6 100 6 200 620 635 KBK101412.5X1 0.0053 

14 14.8 9.8 6 100 6 200 620 635 KBK101414.8X 0.0064 

11 14 13.5 10.8 5 850 7 250 595 740 KBK111413.5X1 0.0044 

15 16.4 13.8 7 500 10 200 765 1 040 KBK121516.6 0.0055 

16 14.8 11.8 7 600 8 600 775 875 KBK121614.8X 0.0072 

12 16 15.4 9.8 7 000 7 800 715 795 KBK121615.6 0.0079 

16 15.8 12.8 8 100 9 350 825 955 KBK121616 0.0073 

17 14.8 9.8 8 400 8 550 855 875 KBK121714.8X 0.0094 

18 16.8 13.8 9 750 12 400 995 1 260 KBK141817 0.0089 

14 18 19.8 13.8 9 150 11 300 930 1 160 KBK141820 0.0130 

19 17.1 12.8 11 100 12 700 1 130 1 300 KBK141917.1X 0.0120 

15 19 17.3 13.8 10 900 14 600 1 110 1 490 KBK151917.3X 0.0100 

16 

20 16.8 13.8 10 800 14 700 1 100 1 500 KBK162017 0.0100 

20 19.6 13.8 10 200 13 600 1 040 1 390 KBK162019.8 0.0130 

20 23.8 19.8 13 600 19 700 1 390 2 010 KBK162023.8X 0.0150 

21 19.6 15.8 13 900 17 600 1 420 1 790 KBK162119.6X 0.0160 

21 23 15.8 13 200 19 400 1 340 1 980 KBK172123.2 0.0160 

17 21 25 17.8 13 100 19 200 1 340 1 960 KBK172125X 0.0170 

22 22 18.8 16 900 22 900 1 720 2 340 KBK172222X1 0.0170 

18 

22 21.8 15.8 12 500 18 300 1 270 1 870 KBK182221.8X3 0.0150 

22 23.8 17.8 13 000 19 300 1 330 1 970 KBK182223.8X1 0.0160 

20 25 27.9 21.8 20 800 31 500 2 120 3 200 KBK202527.9X 0.0270 

22 28 29.9 23.8 26 000 38 000 2 650 3 900 KBK222829.9X1 0.0390 

B-28

Drawn Cup Needle Roller Bearings


NTN 

Drawn Cup Needle Roller Bearings 

This bearing type is composed of an outer ring drawn 

from a thin steel plate by precision drawing, needle rollers 

and a cage assembled in the outer ring after the raceway 

surface thereof was hardened. Of the bearings with outer 

ring, this bearing type is a bearing with the smallest 

section height which enables space-saving and costsaving. 

Usually design is so made as to use a shaft as the 

direct raceway surface without using inner ring. The 

outer ring of this bearing type is of such a construction 

that the needle rollers and the cage are not separated 

from one another, so that the bearing is only press-fitted 

in a rigid housing with proper fit torque. Thus, this 

bearing type needs no snap ring, etc. to fix itself in axial 

direction and, in addition, is easy to handle. 

Type of bearing 

Applied shaft 

diameter (mm) 



Nominal 


Code items 

and dimensions 

Remarks 

HK 

HKT2 

Open end 

350 

HK 06 09 T2 

Tail code 

Width 


diameter 

Type code 

[Tail code] 

T2 : Resin cage 

C : Welding cage 

HK0609T2 


diameter :6 

Width : 9 


The bearings with tail 

code T2 using polyamide 

resin cage shall be used 

at allowable temperature 

120˚C and, under 

continuous running, at 


HKL 

HKLL 

Standard series 

Open end 

single side seal 

1250 

HK 20 18 L This seal type (Tail code : 

L or LL) synthetic rubber 


Tail code 

seal built in at its single 

diameter :20 

Width HK2018L 

side or double sides is 

Width : 18 


internally filled with lithium 

diameter 

L : single side seal 

soap base grease. 

Type code 

The operating temperature 

shall range from -25 to 

100˚C maximum to 

prevent deterioration of 

the seal and filled-up 

HK 20 20 LL 

grease. 

Open end 

double-side seal 

1250 

Tail code 

Width 


diameter 

Type code 

HK2020LL 


diameter :20 

Width : 20 

LL: Double-side seal 

The roller length and rated 

load of this bearing type 

are shorter and smaller 

than those of the open 

type of same dimension. 

HKZWD 

Open end 

double-row type 

1530 

HK 20 30 ZW D 

Tail code 

Tail code 

Width 


diameter 

Type code 

HK2030ZWD 


diameter :20 

Width : 30 

ZW : Double-row 

cage 

D : Outer ring with 

oil hole 

This type is provided with 

oil hole on its outer ring. 

B-30


NTN 

HMK 

HMKT2 

Type of bearing 

Open end 

Applied shaft 

diameter (mm) 

850 



HMK 20 15 

Width 


diameter 

Type code 

Nominal 


HMK2015 

Code items 



diameter :20 

Width : 15 

Remarks 








HMKL 

HMKLL 

Heavy load series 

Open end 


850 

HMK 20 18 L 

HMK 20 21 LL 

Tail code 

Width 


diameter 

Type code 

HMK2018L 

This seal type (Tail code : 

L or LL) synthetic rubber 


seal built in at its single 

diameter :20 

side or double sides is 

Width : 18 

internally filled with lithium 


soap base grease. 






grease. 

Open end 

double-side seal 

850 

Tail code 

Width 


diameter 

Type code 

M2021LL 

Inscribed circle The roller length and rated 

diameter :20 load of this bearing type 

Width : 21 are shorter and smaller 

LL: Double-side seal than those of the open 

type of same dimension. 

HMKZWD 

Open end 


3850 

HMK 38 45 ZW D 

Tail code 

Tail code 

Width 


diameter 

Type code 

HK3845ZWD 


diameter :38 

Width : 45 


cage 


oil hole 

This type is provided with 

oil hole on its outer ring. 

B-31


NTN 

BK 

BKT2 

Type of bearing 

Closed end 

Applied shaft 

diameter (mm) 

350 



BK 20 20 C 

Tail code 

Width 


diameter 

Type code 

Nominal 


BK2020C 

Code items 



diameter :20 

Width : 20 

C : Welding cage 

Remarks 








BKL 

Standard series 

Closed end 


1250 

BK 20 18 L 

Tail code 

Width 


diameter 

Type code 

BK2018L 


diameter :20 

Width : 18 


This seal type (Tail code: 

L) is internally filled up 

with lithium soap base 

grease. 






grease. 

BKZWD 

Closed end 


1530 

BK 20 30 ZW D 

Tail code 

Tail code 

Width 


diameter 

Type code 

BK2030ZWD 


diameter :20 

Width : 30 


cage 


oil hole 


diameter 

DCL 

DCL 16 20 

Inch series 

Open end 

6.35 

50.8 

Width code 


diameter code 

Type code 

DCL1620 


diameter :25.4 

Width : 31.75 

HCK 

Bearing series for universal joints 

Closed end 

1020 

HCK 16 22 

Outer diameter 


diameter 

Type code 

HCK1622 


diameter :16 

Width : 22 

Full complement roller 

type with no cage. 

Already filled up with 

specific grease. 

B-32


NTN 

Bearing Fits 

It is common that drawn cup needle bearing is pressfitted 

in a housing by shrinkage fit so post press-fit 

inscribed circle diameter (Fw) comes to ISO Tolerance 

Rang Class F8. The post press-fit inscribed circle 

diameter (Fw) depends on the housing material and 

rigidity. It is therefore desirable to decide the interference 

based on the data measured in pre-testing. 

Where the housing rigidity is adequately high, the post 

press-fit inscribed circle diameter (Fw) is secured in nearly 

F8 range and nearly ordinary radial clearance can be got 

by adopting the data of bearing fit in housing and on shaft 

as shown in Table-1. 

Table 1 Bearing fit in housing and on shaft 

Bearing type 

HK,BK 

HMK,DCL 

HCK 

Housing 

Shaft 

Iron series Light alloy Without inner ring With inner ring 

N6 (N7) 

J6 (J7) 

F7 

R6 (R7) 

M6 (M7) 

–––– 

h5 (h6) 

k6 

k5 (j6) 

–––– 

Bearing installation 

Any drawn cup needle roller bearings must be pressfitted 

in the housing in specific position by holding a 

specific jig in perfect contact with the mark-stamped side 

face of the bearing, without fail. 

Further, hammering directly the bearing ring in 

installing (press-fitting) is not allowed absolutely. In 

installing, it is recommended to use a mandrel with O-ring 

as illustrated in Fig.1 as a press-fitting jig. The use of this 

mandrel would enable to insert easily any drawn cup 

needle bearing in a housing without risk of twisting and 

fall-down. 

Drawn cup needle roller bearing needs no a snap ring 

and a shoulder for positioning itself in a housing, but the 

bearing must be press-fitted so carefully as not to 

allow its side face to strike the shoulder for 

preventing it from deforming, where press-fitted in a 

housing with shoulder. 

15˚ 

Accuracy of housing bore 

Because of its thin-walled outer ring, the performance 

of drawn cup needle roller bearing is greatly affected by 

the dimensional accuracy, profile accuracy and bore 

surface roughness of a housing in which the bearing is 

press-fitted. To avoid such an inverse affect, the housing 

bore(hole) must have the accuracy as specified in Table 

2. For the shaft accuracy refer to Subsection 7.3 

"Accuracy of Shaft and Housing" (on page A-39). 

Table 2 Accuracy of housing bore 

Marking side 

O-ring 

A 

B 

A 

Fig. 1 

AD(0.20.3) mm 

B=Fw(00.025) mm 

Property 

Roundness (Max) 

Cylindricality (Max) 

Surface roughness (Max) 

Tolerance 

IT4 or less 

IT4 or less 

1.6a 

The Type HCK for application to universal joints is fixed 

to the joint yoke by caulking, using a special-purposed 

assembler. Feel free to contact NTN for any inquiry about 

the special-purposed assembler (IPH Machine). 

Oil hole dimension in outer ring 

The outer rings of double-row (Tail code : ZW) needle 

roller and cage assembly Type HK and Type BK are 

provided with an oil hole to facilitate oil lubrication to the 

bearing. Table 3 shows the nominal oil hole diameter. 

Caulking 

Type HCK 

Seal 

Cross joint 

Table 3 Diameter of oil hole in outer ring (Metric system) 

Outer ring diameter 

Over 

incl. 

Nominal oil hole diameter 

5 

10 

1.5 

10 

20 

2.0 

20 

40 

2.5 

Yoke 

40 

80 

3.0 

80 

200 

3.5 

Fig. 2 

B-33


NTN 

Bearing Tolerances and Measuring Methods 

The outer ring of drawn cup needle roller bearing is so 

thin-walled that deformation thereof to a certain extent is 

unavoidable in the manufacturing processes, particularly 

in the heat-treating process. However, the outer ring is so 

designed that it is reformed normally from such 

deformation when being press-fitted in a housing with 

specific dimensional accuracy and, as a result, it can 

have the accuracy required to fulfill its specific function. 

Hence, it is meaningless to measure the 

dimensional accuracy of bearing itself before being 

press-fitted. So, the following measuring method is 

used; a bearing to be measured is press-fitted in a 

linkage of specific dimension (20mm or more in wall 

thickness) and thereafter the inscribed circle 

diameter (Fw) is measured using a plug gauge or a 

taper gauge to evaluate the bearing accuracy. 

Tables 4 to 7 show the dimensional tolerances for the 

bore diameter of each ring gauge and the inscribed circle 

diameter (Fw) each of standard metric series drawn cup 

needle roller bearings Type HK and BK, heavy load 

series Type HMK (metric series), inch series Type DCL, 

and inch series HCK for application to universal joints. 

When measuring the inscribed circle diameter of roller, 

the low tolerance for the inscribed circle diameter shall be 

applied to the dimension at "GO" side and the value of 

the high tolerance for the inscribed circle diameter plus 

(+) 2m shall be applied to the dimension at "NOT GO" 

side in compliance with the relevant ISO standard. 

Table 4 Dimensional tolerance for inscribed circle diameter (Type HK and BK) 

Unit : mm 

Nominal inscribed 

circle dia. 

Fw 

3 

4 

5 

6 

7 

8 

9 

10 

12 

12 

13 

14 

15 

16 

17 

18 

20 

22 

25 

28 

30 

35 

40 

45 

50 

55 

60 

Nominal outer 

ring outer dia. 

D 

6.5 

8 

9 

10 

11 

12 

13 

14 

16 

18 

19 

20 

21 

22 

23 

24 

26 

28 

32 

35 

37 

42 

47 

52 

58 

63 

68 

Ring gauge 

bore dia. 

6.484 

7.984 

8.984 

9.984 

10.980 

11.980 

12.980 

13.980 

15.980 

17.980 

18.976 

19.976 

20.976 

21.976 

22.976 

23.976 

25.976 

27.976 

31.972 

34.972 

36.972 

41.972 

46.972 

51.967 

57.967 

62.967 

67.967 

Tolerance for 

inscribed circle diameter 

High 

3.016 

4.022 

5.022 

6.022 

7.028 

8.028 

9.028 

10.028 

12.034 

12.034 

13.034 

14.034 

15.034 

16.034 

17.034 

18.034 

20.041 

22.041 

25.041 

28.041 

30.041 

35.050 

40.050 

45.050 

50.050 

55.060 

60.060 

Low 

3.006 

4.010 

5.010 

6.010 

7.013 

8.013 

9.013 

10.013 

12.016 

12.016 

13.016 

14.016 

15.016 

16.016 

17.016 

18.016 

20.020 

22.020 

25.020 

28.020 

30.020 

35.025 

40.025 

45.025 

50.025 

55.030 

60.030 

Table 5 Dimensional tolerance for inscribed circle diameter (Type HMK) 


circle dia. 

Fw 

8 

9 

10 

12 

14 

15 

16 

17 

18 

19 

20 

21 

22 

24 

25 

26 

28 

29 

30 

32 

35 

37 

38 

40 

45 

50 

Nominal outer 


D 

15 

16 

17 

19 

22 

22 

24 

24 

25 

27 

27 

29 

29 

31 

33 

34 

37 

38 

40 

42 

45 

47 

48 

50 

55 

62 

Ring gauge 

bore dia. 

14.995 

15.995 

16.995 

18.995 

21.995 

21.995 

23.995 

23.995 

24.995 

26.995 

26.995 

28.995 

28.995 

30.994 

32.994 

33.994 

36.994 

37.994 

39.994 

41.994 

44.994 

46.994 

47.994 

49.994 

54.994 

61.994 

Unit : mm 

Tolerance for 


High Low 

8.028 

9.028 

10.028 

12.034 

14.034 

15.034 

16.034 

17.034 

18.034 

19.041 

20.041 

21.041 

22.041 

24.041 

25.041 

26.041 

28.041 

29.041 

30.041 

32.050 

35.050 

37.050 

38.050 

40.050 

45.050 

50.050 

8.013 

9.013 

10.013 

12.016 

14.016 

15.016 

16.016 

17.016 

18.016 

19.020 

20.020 

21.020 

22.020 

24.020 

25.020 

26.020 

28.020 

29.020 

30.020 

32.025 

35.025 

37.025 

38.025 

40.025 

45.025 

50.025 

B-34


NTN 

Table 6 Dimensional tolerance for inscribed circle diameter (Type DCL) 


circle dia. 

Fw 

6.350 

7.938 

9.525 

11.112 

12.700 

14.288 

15.875 

17.462 

19.050 

20.638 

22.225 

23.812 

25.400 

26.988 

28.575 

30.162 

31.750 

34.925 

38.100 

41.275 

44.450 

47.625 

50.800 

Nominal outer 


D 

11.112 

12.700 

14.288 

15.875 

17.462 

19.050 

20.638 

22.225 

25.400 

26.988 

28.575 

30.162 

31.750 

33.338 

34.925 

38.100 

38.100 

41.275 

47.625 

50.800 

53.975 

57.150 

60.325 

Ring gauge 

bore dia. 

11.125 

12.713 

14.300 

15.888 

17.475 

19.063 

20.650 

22.238 

25.387 

26.975 

28.562 

30.150 

31.737 

33.325 

34.912 

38.087 

38.087 

41.262 

47.612 

50.787 

53.962 

57.137 

60.312 

Unit : mm 

Tolerance for 


High Low 

6.411 

7.998 

9.586 

11.173 

12.761 

14.348 

15.936 

17.523 

19.086 

20.673 

22.261 

23.848 

25.436 

27.023 

28.611 

30.198 

31.786 

34.963 

38.141 

41.316 

44.493 

47.668 

50.846 

6.388 

7.976 

9.563 

11.151 

12.738 

14.326 

15.913 

17.501 

19.063 

20.650 

22.238 

23.825 

25.413 

27.000 

28.588 

30.175 

31.763 

34.938 

38.113 

41.288 

44.463 

47.638 

50.815 

Table 7 Dimensional tolerance for inscribed circle diameter (Type HCK) 


circle dia. 

Fw 

10 

11.656 

13 

14 

16 

18 

18 

20 

Nominal outer 


D 

15 

17.1 

19 

20 

22 

24 

24.6 

27.9 

Ring gauge 

bore dia. 

15.016 

17.116 

19.020 

20.020 

22.020 

24.020 

24.620 

27.920 

Unit : mm 

Tolerance for 


High Low 

10.026 

11.687 

13.031 

14.031 

16.031 

18.031 

18.031 

20.038 

10.011 

11.669 

13.013 

14.013 

16.013 

18.013 

18.013 

20.017 

B-35


NTN 

Type HK, Type HKZWD 

Type HMK 

Type BKType BKZWD 

C 

C 

D 

FW 

D 

FW 

Type HK, Type HMK 

Opened End Type 

Type HKZWD 

FW 

310mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing numbers Mass Appropriate 1) 

dynamic static dynamic static inner ring 

mm 

N kgf r/min kg 

Fw D C C1 

grease oil open end closed end 

0 max 

-0.2 Cr Cor Cr Cor design design (approx.) (as a reference) 

6.5 6 925 565 94 58 33 000 50 000 HK0306T2 0.0006 

3 

6.5 6 0.8 925 565 94 58 33 000 50 000 BK0306T2 0.0007 

4 

5 

6 

7 

8 8 1 770 1 270 180 129 30 000 45 000 HK0408T2 0.0016 

8 8 1.6 1 770 1 270 180 129 30 000 45 000 BK0408T2 0.0018 

9 9 2 640 2 190 269 224 27 000 40 000 HK0509T2 0.0019 

9 9 1.6 2 640 2 190 269 224 27 000 40 000 BK0509T2 0.0021 

10 9 2 660 2 280 272 233 25 000 37 000 HK0609T2 0.0022 

10 9 1.6 2 660 2 280 272 233 25 000 37 000 BK0609T2 0.0024 

11 9 3 400 3 250 345 330 23 000 34 000 HK0709 0.0025 

11 9 1.6 3 400 3 250 345 330 23 000 34 000 BK0709 0.0027 

12 10 3 850 3 950 395 400 20 000 30 000 HK0810C 0.0032 IR 5 812 

12 10 1.6 3 850 3 950 395 400 20 000 30 000 BK0810C 0.0034 IR 5 812 

8 15 10 3 800 2 870 390 293 20 000 30 000 HMK0810 0.0067 IR 5 812 

15 15 6 600 5 800 675 590 20 000 30 000 HMK0815 0.0100 IR 5 816 

15 20 9 050 8 750 925 890 20 000 30 000 HMK0820T2 0.0130 

9 

10 

13 10 4 750 5 300 485 540 18 000 27 000 HK0910 0.0035 IR 6 912 

13 10 1.6 4 750 5 300 485 540 18 000 27 000 BK0910 0.0039 IR 6 912 

13 12 5 650 6 650 575 680 18 000 27 000 HK0912 0.0042 IR 6 912 

13 12 1.6 5 650 6 650 575 680 18 000 27 000 BK0912 0.0045 IR 6 912 

16 12 5 300 4 450 540 455 18 000 27 000 HMK0912 0.0087 IR 6 916 

16 16 7 400 6 850 755 700 18 000 27 000 HMK0916 0.0120 

14 10 4 500 5 100 460 520 16 000 24 000 HK1010 0.0038 IR 71010.5 

14 10 1.6 4 500 5 100 460 520 16 000 24 000 BK1010 0.0042 IR 71010.5 

14 12 5 900 7 250 605 735 16 000 24 000 HK1012 0.0045 IR 71016 

14 12 1.6 5 900 7 250 605 735 16 000 24 000 BK1012 0.0050 IR 71016 

14 15 7 100 9 150 725 935 16 000 24 000 HK1015 0.0056 IR 71016 

14 15 1.6 7 100 9 150 725 935 16 000 24 000 BK1015 0.0062 IR 71016 

17 10 4 250 3 450 435 350 16 000 24 000 HMK1010 0.0079 IR 71010.5 

17 12 5 600 4 850 570 495 16 000 24 000 HMK1012 0.0094 IR 71016 

Note 1) Bearing with inner ring is represented by HK+IR. (Refer to "Inner Ring Dimensions Table" on page B-117.) 

EX. HK1012 + IR71016.5 

B-36


NTN 

C 

C 

 

C1 

C1 

D 

FW 

D 

FW 

Type BK 

Closed End Type 

Type BKZWD 

FW 

1016mm 



mm 


Fw D C C1 


0 max 


17 15 7 400 6 950 755 710 16 000 24 000 HMK1015 0.0120 IR 71016 

10 

17 20 10 200 10 500 1 040 1 070 16 000 24 000 HMK1020 0.0160 

12 

13 

14 

16 10 5 050 6 250 515 635 13 000 20 000 HK1210 0.0046 IR 81210.5 

16 10 1.6 5 050 6 250 515 635 13 000 20 000 BK1210 0.0052 IR 81210.5 

18 12 6 600 7 300 675 745 13 000 20 000 HK1212 0.0091 IR 81212.5 

18 12 2.7 6 600 7 300 675 745 13 000 20 000 BK1212 0.0100 IR 81212.5 

19 12 7 100 6 900 725 705 13 000 20 000 HMK1212 0.0110 IR 81212.5 

19 15 9 400 9 900 955 1 010 13 000 20 000 HMK1215 0.0140 IR 91216 

19 20 12 300 14 000 1 260 1 430 13 000 20 000 HMK1220 0.0180 

19 25 15 300 18 600 1 560 1 890 13 000 20 000 HMK1225 0.0230 

19 12 6 950 7 900 705 805 12 000 18 000 HK1312 0.0100 IR101312.5 

19 12 2.7 6 950 7 900 705 805 12 000 18 000 BK1312 0.0110 IR101312.5 

20 12 7 200 8 500 735 865 11 000 17 000 HK1412 0.0110 IR101413 

20 12 2.7 7 200 8 500 735 865 11 000 17 000 BK1412 0.0120 IR101413 

20 16 10 700 14 000 1 090 1 430 11 000 17 000 HK1416 0.0150 

20 16 2.7 10 700 14 000 1 090 1 430 11 000 17 000 BK1416 0.0160 

22 16 11 500 12 000 1 180 1 220 11 000 17 000 HMK1416 0.0190 IR101420 

22 20 14 600 16 200 1 490 1 650 11 000 17 000 HMK1420 0.0240 

21 12 7 500 9 100 765 930 11 000 16 000 HK1512 0.0110 IR121512.5 

21 12 2.7 7 500 9 100 765 930 11 000 16 000 BK1512 0.0130 IR121512.5 

21 16 10 700 14 400 1 090 1 470 11 000 16 000 HK1516 0.0150 IR121516.5 

21 16 2.7 10 700 14 400 1 090 1 470 11 000 16 000 BK1516 0.0170 IR121516.5 

21 22 12 900 18 200 1 310 1 860 11 000 16 000 HK1522ZWD 0.0200 IR121522.5 

15 21 22 2.7 12 900 18 200 1 310 1 860 11 000 16 000 BK1522ZWD 0.0220 IR121522.5 

22 10 6 100 6 000 620 610 11 000 16 000 HMK1510 0.0110 IR101512.5 

22 12 7 950 8 450 810 860 11 000 16 000 HMK1512 0.0130 IR121512.5 

22 15 10 900 12 700 1 120 1 300 11 000 16 000 HMK1515 0.0160 IR121516 

22 20 14 900 18 900 1 510 1 920 11 000 16 000 HMK1520 0.0220 IR121522.5 

22 25 18 500 25 000 1 880 2 550 11 000 16 000 HMK1525 0.0270 

16 22 12 7 750 9 700 795 990 10 000 15 000 HK1612 0.0120 IR121613 

Note 1) Bearing with inner ring is represented by HK+IR. (Refer to "Inner Ring Dimensions Table" on page B-117, B118.) 

EX. HK1312 + IR101312.5 

B-37


NTN 


Type HMK 

Type BK, Type BKZWD 

C 

C 

D 

FW 

D 

FW 



Type HKZWD 

FW 

1620mm 



mm 


Fw D C C1 


0 max 


22 12 2.7 7 750 9 700 795 990 10 000 15 000 BK1612 0.014 IR121613 

22 16 11 100 15 300 1 130 1 560 10 000 15 000 HK1616 0.016 IR121620 

22 16 2.7 11 100 15 300 1 130 1 560 10 000 15 000 BK1616 0.018 IR121620 

16 22 22 13 300 19 400 1 360 1 980 10 000 15 000 HK1622ZWD 0.022 

22 22 2.7 13 300 19 400 1 360 1 980 10 000 15 000 BK1622ZWD 0.023 

24 16 12 400 13 500 1 260 1 370 10 000 15 000 HMK1616 0.021 IR121620 

24 20 15 600 18 200 1 590 1 860 10 000 15 000 HMK1620 0.027 IR121622 

23 12 8 500 11 100 865 1 130 9 500 14 000 HK1712 0.012 

23 12 2.7 8 500 11 100 865 1 130 9 500 14 000 BK1712 0.015 

17 24 15 12 100 15 000 1 230 1 530 9 500 14 000 HMK1715 0.018 IR141717 

24 20 15 200 20 000 1 540 2 040 9 500 14 000 HMK1720C 0.024 IR121720.5 

24 25 19 300 27 400 1 970 2 790 9 500 14 000 HMK1725B 0.030 IR121725.5 

18 

19 

20 

24 12 8 300 10 900 845 1 110 8 500 13 000 HK1812 0.013 IR151812.5 

24 12 2.7 8 300 10 900 845 1 110 8 500 13 000 BK1812 0.015 IR151812.5 

24 16 11 800 17 300 1 210 1 760 8 500 13 000 HK1816 0.018 IR151816.5 

24 16 2.7 11 800 17 300 1 210 1 760 8 500 13 000 BK1816 0.020 IR151816.5 

25 13 10 200 12 200 1 040 1 240 8 500 13 000 HMK1813 0.016 IR151816 

25 15 12 000 15 100 1 220 1 540 8 500 13 000 HMK1815 0.019 IR151816 

25 17 13 800 18 000 1 400 1 830 8 500 13 000 HMK1817 0.021 IR151817.5 

25 19 15 500 20 900 1 580 2 130 8 500 13 000 HMK1819 0.024 IR151820.5 

25 20 16 300 22 300 1 660 2 280 8 500 13 000 HMK1820 0.025 IR151820.5 

25 25 20 300 29 600 2 070 3 000 8 500 13 000 HMK1825 0.031 IR151825.5 

27 16 13 900 16 300 1 410 1 660 8 500 13 000 HMK1916 0.025 IR151920 

27 20 17 500 22 100 1 790 2 250 8 500 13 000 HMK1920 0.031 

26 12 9 250 13 000 945 1330 8 000 12 000 HK2012C 0.014 IR152013 

26 12 2.7 9 250 13 000 945 1330 8 000 12 000 BK2012 0.017 IR152013 

26 16 13 000 20 100 1 320 2 050 8 000 12 000 HK2016 0.019 IR172016.5 

26 16 2.7 13 000 20 100 1 320 2 050 8 000 12 000 BK2016 0.022 IR172016.5 

26 20 16 400 27 100 1 670 2 760 8 000 12 000 HK2020C 0.024 IR172020.5 

26 20 2.7 16 400 27 100 1 670 2 760 8 000 12 000 BK2020C 0.027 IR172020.5 


EX. HK1812 + IR151812.5 

B-38


NTN 

C 

C 

 

C1 

C1 

D 

FW 

D 

FW 

Type BK 


Type BKZWD 

FW 

2025mm 



mm 


Fw D C C1 


0 max 


26 30 22 200 40 000 2 270 4 100 8 000 12 000 HK2030ZWD 0.035 IR172030.5 

26 30 2.7 22 200 40 000 2 270 4 100 8 000 12 000 BK2030ZWD 0.037 IR172030.5 

20 

27 15 13 000 17 300 1 330 1 760 8 000 12 000 HMK2015 0.021 IR172016.5 

27 20 17 700 25 600 1 800 2 610 8 000 12 000 HMK2020 0.027 IR172020.5 

27 25 22 000 34 000 2 240 3 450 8 000 12 000 HMK2025 0.034 IR152026 

27 30 26 100 42 000 2 660 4 300 8 000 12 000 HMK2030 0.041 IR172030.5 

21 

29 16 15 300 19 100 1 560 1 940 7 500 11 000 HMK2116 0.027 IR172120 

29 20 19 400 25 800 1 970 2 630 7 500 11 000 HMK2120 0.033 

28 12 9 750 14 300 995 1 460 7 500 11 000 HK2212 0.013 IR172213 

28 12 2.7 9 750 14 300 995 1 460 7 500 11 000 BK2212 0.015 IR172213 

28 16 13 600 22 100 1 390 2 250 7 500 11 000 HK2216C 0.021 IR172218 

28 16 2.7 13 600 22 100 1 390 2 250 7 500 11 000 BK2216 0.024 IR172218 

28 20 17 200 29 800 1 760 3 050 7 500 11 000 HK2220C 0.026 IR172220.5 

22 28 20 2.7 17 200 29 800 1 760 3 050 7 500 11 000 BK2220 0.030 IR172220.5 

29 10 8 400 10 100 855 1 030 7 500 11 000 HMK2210 0.015 IR172213 

29 15 13 400 18 500 1 370 1 890 7 500 11 000 HMK2215 0.022 IR172216D 

29 20 18 200 27 400 1 860 2 790 7 500 11 000 HMK2220 0.030 IR172220.5 

29 25 23 600 38 500 2 410 3 900 7 500 11 000 HMK2225 0.037 IR172226 

29 30 26 900 45 000 2 740 4 600 7 500 11 000 HMK2230 0.045 IR172232 

24 

31 20 18 800 29 100 1 910 2 970 6 500 10 000 HMK2420 0.032 

31 28 26 000 44 500 2 650 4 500 6 500 10 000 HMK2428 0.045 IR202428.5 

32 12 11 800 16 300 1 200 1 660 6 500 9 500 HK2512 0.021 IR202512.5 

32 12 2.7 11 800 16 300 1 200 1 660 6 500 9 500 BK2512 0.023 IR202512.5 

32 16 15 900 24 000 1 620 2 450 6 500 9 500 HK2516 0.027 IR202517 

32 16 2.7 15 900 24 000 1 620 2 450 6 500 9 500 BK2516 0.031 IR202517 

25 32 20 20 300 33 000 2 070 3 350 6 500 9 500 HK2520 0.034 IR202520.5 

32 20 2.7 20 300 33 000 2 070 3 350 6 500 9 500 BK2520 0.039 IR202520.5 

32 26 26 400 46 000 2 690 4 700 6 500 9 500 HK2526 0.045 IR202526.5 

32 26 2.7 26 400 46 000 2 690 4 700 6 500 9 500 BK2526 0.049 IR202526.5 

32 38 35 000 65 500 3 550 6 700 6 500 9 500 HK2538ZWD 0.065 IR202538.5 


EX. HK2512 + IR202512.5 

B-39


NTN 


Type HMK, Type HMKZWD 

Type BK, Type BKZWD 

C 

C 

D 

FW 

D 

FW 



Type HKZWD 

Type HMKZWD 

FW 

2530mm 



mm 


Fw D C C1 


0 max 


32 38 2.7 35 000 65 500 3 550 6 700 6 500 9 500 BK2538ZWD 0.069 IR202538.5 

33 10 9 150 10 400 935 1 060 6 500 9 500 HMK2510 0.019 IR202512.5 

25 

33 15 15 200 19 900 1 550 2 030 6 500 9 500 HMK2515C 0.029 IR202516 

33 20 21 800 31 500 2 220 3 200 6 500 9 500 HMK2520 0.039 IR202520.5 

33 25 26 700 41 000 2 720 4 200 6 500 9 500 HMK2525 0.048 IR202526.5 

33 30 32 500 53 000 3 300 5 400 6 500 9 500 HMK2530 0.058 IR202532 

26 

28 

29 

30 

34 16 17 200 23 300 1 750 2 380 6 000 9 000 HMK2616 0.032 IR222620 

34 20 21 800 31 500 2 220 3 200 6 000 9 000 HMK2620 0.040 

35 16 17 300 27 600 1 760 2 820 5 500 8 500 HK2816 0.030 IR222817 

35 16 2.7 17 300 27 600 1 760 2 820 5 500 8 500 BK2816 0.034 IR222817 

35 20 21 300 36 000 2 170 3 700 5 500 8 500 HK2820 0.038 IR222820.5 

35 20 2.7 21 300 36 000 2 170 3 700 5 500 8 500 BK2820 0.043 IR222820.5 

37 20 23 600 32 500 2 410 3 350 5 500 8 500 HMK2820 0.049 IR222820.5 

37 30 35 000 54 500 3 600 5 550 5 500 8 500 HMK2830 0.073 

38 20 24 600 35 000 2 510 3 550 5 500 8 500 HMK2920 0.050 

38 30 34 500 54 000 3 550 5 550 5 500 8 500 HMK2930 0.075 

37 12 13 000 19 500 1 320 1 990 5 500 8 000 HK3012 0.024 IR253012.5 

37 12 2.7 13 000 19 500 1 320 1 990 5 500 8 000 BK3012 0.028 IR253012.5 

37 16 18 100 30 000 1 850 3 050 5 500 8 000 HK3016 0.032 IR253017 

37 16 2.7 18 100 30 000 1 850 3 050 5 500 8 000 BK3016C 0.037 IR253017 

37 20 22 300 39 500 2 280 4 000 5 500 8 000 HK3020 0.040 IR253020.5 

37 20 2.7 22 300 39 500 2 280 4 000 5 500 8 000 BK3020 0.047 IR253020.5 

37 26 28 500 54 000 2 910 5 500 5 500 8 000 HK3026 0.053 IR253026.5 

37 26 2.7 29 100 55 000 2 960 5 650 5 500 8 000 BK3026 0.059 IR253026.5 

37 38 38 500 78 500 3 900 8 000 5 500 8 000 HK3038ZWD 0.076 IR253038.5 

37 38 2.7 38 500 78 500 3 900 8 000 5 500 8 000 BK3038ZWD 0.083 IR253038.5 

40 13 14 100 17 100 1 430 1 750 5 500 8 000 HMK3013 0.040 IR253016 

40 15 17 100 22 100 1 750 2 250 5 500 8 000 HMK3015 0.044 IR253016 

40 20 24 200 34 500 2 470 3 500 5 500 8 000 HMK3020 0.058 IR253020.5 

40 25 31 000 47 000 3 150 4 800 5 500 8 000 HMK3025 0.073 IR253026.5 

Note 1) Bearing with inner ring is represented by HK+IR. (Refer to "Inner Ring Dimensions Table" on page B-120.) 

EX. HK2820 + IR222820.5 

B-40


NTN 

C 

C 

 

C1 

C1 

D 

FW 

D 

FW 

Type BK 


Type BKZWD 

FW 

 



mm 


Fw D C C1 


0 max 


30 40 30 36 000 57 500 3 700 5 850 5 500 8 000 HMK3030 0.087 IR253032 

32 

42 20 27 500 38 000 2 800 3 850 5 000 7 500 HMK3220 0.062 

42 30 41 500 64 500 4 250 6 550 5 000 7 500 HMK3230 0.092 

42 12 14 000 22 800 1 430 2 320 4 700 7 000 HK3512 0.028 

42 12 2.7 14 000 22 800 1 430 2 320 4 700 7 000 BK3512 0.033 

42 16 19 700 35 000 2 000 3 600 4 700 7 000 HK3516 0.037 

42 16 2.7 19 700 35 000 2 000 3 600 4 700 7 000 BK3516 0.044 

42 20 24 800 47 500 2 530 4 850 4 700 7 000 HK3520 0.046 

35 42 20 2.7 24 800 47 500 2 530 4 850 4 700 7 000 BK3520 0.055 

45 12 14 900 17 600 1 520 1 800 4 700 7 000 HMK3512 0.040 

45 15 20 200 26 200 2 060 2 670 4 700 7 000 HMK3515 0.050 

45 20 28 400 40 500 2 890 4 100 4 700 7 000 HMK3520 0.067 

45 25 36 000 54 500 3 650 5 550 4 700 7 000 HMK3525 0.083 

45 30 43 000 69 000 4 400 7 000 4 700 7 000 HMK3530 0.100 

37 

47 20 29 300 43 000 2 990 4 350 4 300 6 500 HMK3720 0.070 

47 30 44 500 73 000 4 550 7 450 4 300 6 500 HMK3730 0.105 

48 15 21 700 29 300 2 210 2 990 4 300 6 500 HMK3815 0.054 

48 20 30 500 45 000 3 100 4 600 4 300 6 500 HMK3820 0.072 

38 48 25 38 500 61 000 3 900 6 250 4 300 6 500 HMK3825 0.090 

48 30 46 000 77 000 4 700 7 850 4 300 6 500 HMK3830 0.107 IR323832 

48 45 62 000 113 000 6 300 11 500 4 300 6 500 HMK3845ZWD 0.161 

47 12 15 100 26 000 1 540 2 660 4 000 6 000 HK4012 0.031 IR354012.5 

47 12 2.7 15 100 26 000 1 540 2 660 4 000 6 000 BK4012 0.038 IR354012.5 

47 16 21 100 40 000 2 150 4 100 4 000 6 000 HK4016 0.041 IR354017 

47 16 2.7 21 100 40 000 2 150 4 100 4 000 6 000 BK4016 0.051 IR354017 

40 47 20 25 900 52 500 2 650 5 350 4 000 6 000 HK4020 0.052 IR354020.5 

47 20 2.7 25 900 52 500 2 650 5 350 4 000 6 000 BK4020 0.064 IR354020.5 

50 15 23 100 32 500 2 350 3 300 4 000 6 000 HMK4015 0.056 IR354017 

50 20 32 500 50 000 3 300 5 100 4 000 6 000 HMK4020 0.075 IR354020.5 

50 25 41 000 67 500 4 150 6 900 4 000 6 000 HMK4025 0.094 


EX. HK4012 + IR354012.5 

B-41


NTN 

Type HK 

Type HMK, Type HMKZWD 

Type BK 

C 

C 

D 

FW 

D 

FW 


Type HMKZWD 


FW 

4050mm 



mm 


Fw D C C1 


0 max 


50 30 49 000 85 000 5 000 8 700 4 000 6 000 HMK4030 0.112 IR354034 

40 

50 40 58 500 107 000 5 950 10 900 4 000 6 000 HMK4040ZWD 0.150 

45 

52 16 21 600 43 000 2 210 4 400 3 700 5 500 HK4516 0.046 IR404517 

52 16 2.7 21 600 43 000 2 210 4 400 3 700 5 500 BK4516 0.058 IR404517 

52 20 27 600 59 000 2 810 6 000 3 700 5 500 HK4520 0.058 IR404520.5 

52 20 2.7 27 600 59 000 2 810 6 000 3 700 5 500 BK4520 0.072 IR404520.5 

55 20 33 000 53 000 3 350 5 400 3 700 5 500 HMK4520 0.083 IR404520.5 

55 25 41 500 71 500 4 250 7 300 3 700 5 500 HMK4525 0.104 IR404526.5 

55 30 49 500 90 000 5 050 9 150 3 700 5 500 HMK4530 0.125 IR404534 

55 40 59 500 113 000 6 050 11 500 3 700 5 500 HMK4540ZWD 0.167 

58 20 31 500 63 000 3 200 6 450 3 200 4 800 HK5020 0.072 IR405022 

58 20 2.7 31 500 63 000 3 200 6 450 3 200 4 800 BK5020 0.087 IR405022 

58 25 38 500 82 000 3 900 8 400 3 200 4 800 HK5025 0.090 IR455025.5 

58 25 2.7 38 500 82 000 3 900 8 400 3 200 4 800 BK5025 0.109 IR455025.5 

62 12 18 200 23 600 1 860 2 410 3 200 4 800 HMK5012 0.067 

50 62 15 25 900 37 000 2 650 3 800 3 200 4 800 HMK5015 0.084 

62 20 37 500 60 000 3 850 6 100 3 200 4 800 HMK5020 0.112 IR405022 

62 25 48 000 82 500 4 900 8 450 3 200 4 800 HMK5025 0.140 IR455025.5 

62 30 58 500 105 000 5 950 10 700 3 200 4 800 HMK5030B 0.168 IR455032 

62 40 70 000 134 000 7 150 13 600 3 200 4 800 HMK5040ZWD 0.224 

62 45 79 000 156 000 8 050 15 900 3 200 4 800 HMK5045ZWBD 0.252 


EX. HK4516 + IR404517 

B-42


NTN 

C 

C1 

D 

FW 

Type BK 


B-43

Drawn cup needle roller bearings sealed type 

NTN 

Type HKL 

Type HMKL 

Type HKLL 

Type HMKLL 

Type BKL 

Type HKL, Type HMKL 

(Opened end and single-side seal type) 

Type HKLL, Type HMKLL 

(Opened end and double-side seal type) 

FW 

825mm 

Boundary dimensions Basic load ratings Limiting Bearing numbers 

dynamic static dynamic static speeds 

mm N kgf r/min 

Fw D C1 C2 C3 grease open end open end closed end 

0 

0.2 

0 

0.2 

max 

Cr Cor Cr Cor single seal double seal single seal 

8 15 12 14 3 800 2 870 390 293 10 000 HMK0812L HMK0814LL 

10 17 12 14 4 250 3 450 435 350 10 000 HMK1012L HMK1014LL 

12 

14 

18 14 16 2.7 6 600 7 300 675 745 10 000 HK 1214L HK 1216LL BK1214L 

19 14 16 7 100 6 900 725 705 10 000 HMK1214L HMK1216LL 

20 14 16 2.7 7 200 8 500 735 865 10 000 HK 1414L HK 1416LL BK1414L 

22 19 22 11 500 12 000 1 180 1 220 10 000 HMK1419L HMK1422LL 

21 14 16 2.7 7 500 9 100 765 930 10 000 HK 1514L HK 1516LL BK1514L 

15 22 13 16 6 100 6 000 620 610 10 000 HMK1513L HMK1516LL 

22 18 21 10 900 12 700 1 120 1 300 10 000 HMK1518L HMK1521LL 

16 

22 14 16 2.7 7 750 9 700 795 990 10 000 HK 1614L HK 1616LL BK1614L 

24 23 26 15 600 18 200 1 590 1 860 10 000 HMK1623L HMK1626LL 

17 24 18 21 12 100 15 000 1 230 1 530 9 500 HMK1718L HMK1721LL 

24 14 16 2.7 8 300 10 900 845 1 110 9 000 HK 1814L HK 1816LL BK1814L 

18 25 18 21 12 000 15 100 1 220 1 540 9 000 HMK1818L HMK1821LL 

25 20 23 13 800 18 000 1 400 1 830 9 000 HMK1820L HMK1823LL 

19 27 19 22 13 900 16 300 1 410 1 660 8 500 HMK1919L HMK1922LL 

20 

22 

26 16 9 250 13 000 945 1 330 8 000 HK 2016LL 

26 18 20 2.7 13 000 20 100 1 320 2 050 8 000 HK 2018L HK 2020LL BK2018L 

27 18 21 13 000 17 300 1 330 1 760 8 000 HMK2018L HMK2021LL 

27 23 26 17 700 25 600 1 800 2 610 8 000 HMK2023L HMK2026LL 

28 16 9 750 14 300 995 1 460 7 500 HK 2216LL 

28 18 20 2.7 13 600 22 100 1 390 2 250 7 500 HK 2218L HK 2220LL BK2218L 

29 18 21 13 400 18 500 1 370 1 890 7 500 HMK2218L HMK2221LL 

29 23 26 18 200 27 400 1 860 2 790 7 500 HMK2223L HMK2226LL 

24 31 23 26 18 800 29 100 1 910 2 970 6 500 HMK2423L HMK2426LL 

25 

32 16 11 800 16 300 1 200 1 660 6 500 HK 2516LL 

32 18 20 2.7 15 900 24 000 1 620 2 450 6 500 HK 2518L HK 2520LL BK2518L 

Note 1) Bearing with inner ring is represented by HK+IR. (Refer to "Inner Ring Dimensions Table" on page B-117 to B119.) 

EX. HK1416LL + IR101420 

B-44


NTN 

Type BKL 

(Closed end and single-side seal type) 

Mass Appropriate 1) 

kg 

inner ring 

(approx.) 

(as a reference) 

open end open end closed end single seal double seal 

single seal double seal single seal 

0.0071 0.0075 IR 5816 IR 5 816 

0.0084 0.0089 IR 71016 IR 71016 

0.011 0.0120 0.012 IR 91216 

0.011 0.0120 IR 91216 

0.012 0.0140 0.014 IR101416 IR101420 

0.020 0.0210 IR101420 

0.013 0.0140 0.014 IR121516.5 IR121516.5 

0.014 0.0150 IR121516 IR121516.5 

0.017 0.0180 IR121522.5 IR121522.5 

0.013 0.0150 0.015 IR121616 IR121620 

0.028 0.0290 

0.019 0.0200 IR121720.5 IR121725.5 

0.015 0.0170 0.017 IR151816 IR151817.5 

0.020 0.0210 IR151820.5 IR151825.5 

0.023 0.0240 IR151820.5 IR151825.5 

0.027 0.0290 IR151920 

0.0190 IR152018 

0.021 0.0240 0.024 IR172020 IR172020.5 

0.022 0.0240 IR172020 IR152023 

0.029 0.0310 IR152026 IR172030.5 

0.0200 IR172218 

0.024 0.0260 0.027 IR172220.5 IR172223 

0.024 0.0260 IR172220.5 IR172223 

0.032 0.0330 IR172226 

0.035 0.0370 IR202428.5 

0.0270 IR202518D 

0.031 0.0330 0.035 IR202520 IR202523 

B-45


NTN 

Type HKL 

Type HMKL 

Type HKLL 

Type HMKLL 

Type BKL 

Type HKL, Type HMKL 

(Opened end and single-side seal type) 

Type HKLL, Type HMKLL 

(Opened end and double-side seal type) 

FW 

2550mm 

Boundary dimensions Basic load ratings Limiting Bearing numbers 

dynamic static dynamic static speeds 


Fw D C1 C2 C3 grease open end open end closed end 

25 

0 

0.2 

0 

0.2 

max 

Cr Cor Cr Cor single seal double seal single seal 

33 18 21 15 800 21 000 1 610 2 140 6 500 HMK2518L HMK2521LL 

33 23 26 21 800 31 500 2 220 3 200 6 500 HMK2523L HMK2526LL 

28 

30 

35 20 17 300 27 600 1 760 2 820 5 500 HK 2820LL 

37 23 26 23 600 32 500 2 410 3 350 5 500 HMK2823L HMK2826LL 

37 16 13 000 19 500 1 320 1 990 5 500 HK 3016LL 

37 18 20 2.7 18 100 30 000 1 850 3 050 5 500 HK 3018L HK 3020LL BK3018L 

40 23 26 24 200 34 500 2 470 3 500 5 500 HMK3023L HMK3026LL 

40 28 31 31 000 47 000 3 150 4 800 5 500 HMK3028L HMK3031LL 

32 42 23 26 27 500 38 000 2 800 3 850 5 000 HMK3223L HMK3226LL 

35 

42 16 14 000 22 800 1 430 2 320 4 600 HK 3516LL 

42 18 20 2.7 19 700 35 000 2 000 3 600 4 600 HK 3518L HK 3520LL BK3518L 

45 18 21 20 200 26 200 2 060 2 670 4 600 HMK3518L HMK3521LL 

45 28 31 36 000 54 500 3 650 5 550 4 600 HMK3528L HMK3531LL 

38 48 28 31 38 500 61 000 3 900 6 250 4 200 HMK3828L HMK3831LL 

40 

45 

50 

47 16 15 100 26 000 1 540 2 660 4 000 HK 4016LL 

47 18 20 2.7 21 100 40 000 2 150 4 100 4 000 HK 4018L HK 4020LL BK4018L 

50 18 21 23 100 32 500 2 350 3 300 4 000 HMK4018L HMK4021LL 

50 28 31 41 000 67 500 4 150 6 900 4 000 HMK4028L HMK4031LL 

52 18 20 2.7 21 600 43 000 2 210 4 400 3 600 HK 4518L HK 4520LL BK4518L 

55 23 26 33 000 53 000 3 350 5 400 3 600 HMK4523L HMK4526LL 

58 22 24 2.7 31 500 63 000 3 200 6 450 3 200 HK 5022L HK 5024LL BK5022L 

62 28 31 48 000 82 500 4 900 8 450 3 200 HMK5028L HMK5031LL 

Note 1) Bearing with inner ring is represented by HK+IR. (Refer to "Inner Ring Dimensions Table" on page B-119 to B123.) 

EX. HK5022L + IR455025 

B-46


NTN 

Type BKL 

(Closed end and single-side seal type) 

Mass Appropriate 1) 

kg 

inner ring 

(approx.) 

(as a reference) 

open end open end closed end single seal double seal 

single seal double seal single seal 

0.031 0.034 IR202520 IR202523 

0.041 0.043 IR202526.5 IR202526.5 

0.037 IR222823 

0.051 0.054 IR222830 

0.027 IR253018D 

0.037 0.039 0.045 IR253020 IR253023 

0.061 0.064 IR253026 IR253026.5 

0.076 0.078 IR253030 IR253032 

0.065 0.069 IR283230 

0.036 

0.037 0.040 0.047 

0.053 0.056 

0.086 0.089 

0.094 0.098 IR323832 IR323832 

0.041 IR354017 

0.047 0.050 0.062 IR354020 

0.060 0.063 IR354020 

0.097 0.100 IR354030 IR324036 

0.054 0.057 0.072 IR404520 

0.087 0.091 IR404526.5 IR404526.5 

0.086 0.089 0.104 IR455025 IR455025.5 

0.144 0.149 IR455032 IR455032 

B-47


NTN 

Inch series 

Type DCL 

FW 

6.35015.875mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing Mass Appropriate 1) 

dynamic static dynamic static numbers inner ring 

mm (!/25.4mm) 


Fw D C grease oil 

0 

0.2 

Cr Cor Cr Cor (approx.) (as a reference) 

11.112(&/16) 6.350(!/4) 1 580 1 110 161 113 25 000 38 000 DCL 44T2 0.0022 

6.350(!/4) 11.112(&/16) 7.938(%/16) 2 160 1 670 221 170 25 000 38 000 DCL 45T2 0.0033 

11.112(&/16) 11.112(&/16) 3 550 3 150 360 320 25 000 38 000 DCL 47T2 0.0038 

7.938(%/16) 

9.525(#/8) 

12.700(!/2) 7.938(%/16) 2 940 2 610 300 266 20 000 30 000 DCL 55 0.0032 

12.700(!/2) 9.525(#/8) 3 900 3 750 400 385 20 000 30 000 DCL 56 0.0039 

12.700(!/2) 11.112(&/16) 4 800 4 950 490 505 20 000 30 000 DCL 57 0.0048 

12.700(!/2) 14.288((/16) 6 500 7 250 665 740 20 000 30 000 DCL 59 0.0058 

14.288((/16) 7.938(%/16) 3 100 2 910 315 297 17 000 25 000 DCL 65 0.0037 

14.288((/16) 9.525(#/8) 4 100 4 200 420 430 17 000 25 000 DCL 66 0.0045 

14.288((/16) 12.700(!/2) 5 900 6 650 600 675 17 000 25 000 DCL 68 0.0065 

14.288((/16) 15.875(%/8) 7 500 9 050 765 925 17 000 25 000 DCL 610 0.0075 

11.112(&/16) 15.875(%/8) 12.700(!/2) 6 450 7 800 660 795 15 000 22 000 DCL 78 0.0068 

12.700(!/2) 

14.288((/16) 

17.462(!!/16) 7.938(%/16) 3 550 3 700 360 380 13 000 19 000 DCL 85 0.0047 

17.462(!!/16) 9.525(#/8) 4 700 5 350 480 550 13 000 19 000 DCL 86 0.0057 

17.462(!!/16) 11.112(&/16) 5 800 7 050 590 715 13 000 19 000 DCL 87 0.0066 

17.462(!!/16) 12.700(!/2) 6 700 8 500 685 865 13 000 19 000 DCL 88 0.0080 

17.462(!!/16) 15.875(%/8) 8 550 11 600 870 1 180 13 000 19 000 DCL 810 0.0095 

17.462(!!/16) 19.050(#/4) 10 400 14 900 1 060 1 520 13 000 19 000 DCL 812 0.0120 

19.050(#/4) 7.938(%/16) 3 800 4 250 390 430 11 000 17 000 DCL 95 0.0052 

19.050(#/4) 9.525(#/8) 5 050 6 150 515 625 11 000 17 000 DCL 96 0.0063 MI-060908 

19.050(#/4) 11.112(&/16) 6 250 8 000 635 815 11 000 17 000 DCL 97 0.0073 MI-060908 

19.050(#/4) 12.700(!/2) 7 200 9 650 735 985 11 000 17 000 DCL 98 0.0086 MI-060908 

19.050(#/4) 15.875(%/8) 9 200 13 200 935 1 350 11 000 17 000 DCL 910 0.0110 

19.050(#/4) 19.050(#/4) 11 200 17 000 1 140 1 730 11 000 17 000 DCL 912 0.0130 

20.638(!#/16) 7.938(%/16) 4 050 4 750 415 485 10 000 15 000 DCL 105 0.0075 

20.638(!#/16) 11.112(&/16) 6 650 9 000 680 915 10 000 15 000 DCL 107 0.0080 

15.875(%/8) 20.638(!#/16) 12.700(!/2) 7 700 10 800 785 1 110 10 000 15 000 DCL 108 0.0091 

20.638(!#/16) 15.875(%/8) 9 800 14 800 1 000 1 510 10 000 15 000 DCL1010 0.0130 MI061012 

20.638(!#/16) 19.050(#/4) 11 900 19 000 1 220 1 940 10 000 15 000 DCL1012 0.0140 MI-061012 

Note 1) Bearing with inner ring is represented by DCL-MI. (Refer to Inner Ring Dimension Table on page B-129.) 

EX. DCL96 + MI-060908 

Remarks: Manufacture of the closed end type bearings under this Table is also available. 

B-48


NTN 

FW 

15.87525.400mm 



mm (!/25.4mm) 



0 

0.2 


15.875(%/8) 20.638(!#/16) 22.225(&/8) 14 100 23 500 1 430 2 400 10 000 15 000 DCL1014 0.0160 MI-061016 

17.462(!!/16) 

19.050(#/4) 

22.225(&/8) 9.525(#/8) 5 700 7 650 585 780 9 500 14 000 DCL 116 0.0075 

22.225(&/8) 12.700(!/2) 8 150 12 000 830 1 230 9 500 14 000 DCL 118 0.0110 

22.225(&/8) 15.875(%/8) 10 400 16 400 1 060 1 680 9 500 14 000 DCL1110 0.0130 

22.225(&/8) 19.050(#/4) 12 600 21 100 1 290 2 150 9 500 14 000 DCL1112 0.0160 

25.400(1) 9.525(#/8) 6 450 6 950 660 705 8 500 13 000 DCL 126 0.0110 

25.400(1) 12.700(!/2) 9 800 11 900 1 000 1 210 8 500 13 000 DCL 128 0.0140 MI-081210 

25.400(1) 15.875(%/8) 12 900 16 800 1 310 1 720 8 500 13 000 DCL1210 0.0170 MI-081210 

25.400(1) 19.050(#/4) 15 900 22 100 1 620 2 250 8 500 13 000 DCL1212 0.0210 MI-081212 

25.400(1) 22.225(&/8) 19 000 27 700 1 930 2 830 8 500 13 000 DCL1214 0.0260 MI-081216 

25.400(1) 25.400(1) 21 700 33 000 2 210 3 350 8 500 13 000 DCL1216 0.0300 MI-081216 

26.988(1 !/16) 9.525(#/8) 6 950 7 800 710 795 8 000 12 000 DCL 136 0.0120 

26.988(1 !/16) 12.700(!/2) 10 600 13 400 1 080 1 370 8 000 12 000 DCL 138 0.0160 

26.988(1 !/16) 15.875(%/8) 13 900 19 000 1 410 1 930 8 000 12 000 DCL1310 0.0200 

20.638(!#/16) 26.988(1 !/16) 19.050(#/4) 17 100 24 900 1 750 2 540 8 000 12 000 DCL1312 0.0230 

26.988(1 !/16) 22.225(&/8) 20 400 31 500 2 080 3 200 8 000 12 000 DCL1314 0.0280 

26.988(1 !/16) 25.400(1) 23 400 37 000 2 380 3 800 8 000 12 000 DCL1316 0.0320 

26.988(1 !/16) 31.750(1 !/4) 29 000 49 000 2 960 5 000 8 000 12 000 DCL1320 0.0400 

28.575(1 !/8) 9.525(#/8) 7 150 8 300 730 845 7 500 11 000 DCL 146 0.0130 MI-101406 

28.575(1 !/8) 12.700(!/2) 10 900 14 200 1 110 1 450 7 500 11 000 DCL 148 0.0170 MI-101408 

22.225(&/8) 28.575(1 !/8) 19.050(#/4) 17 600 26 400 1 800 2 700 7 500 11 000 DCL1412 0.0250 MI-101412 

28.575(1 !/8) 22.225(&/8) 21 000 33 000 2 140 3 400 7 500 11 000 DCL1414 0.0340 MI-101416 

28.575(1 !/8) 25.400(1) 24 100 39 500 2 450 4 000 7 500 11 000 DCL1416 0.0340 MI-101416 

23.812(!%/16) 

25.400(1) 

30.162(1 #/16) 15.875(%/8) 14 600 21 300 1 490 2 170 6 500 10 000 DCL1510 0.0230 

30.162(1 #/16) 25.400(1) 24 700 41 500 2 520 4 250 6 500 10 000 DCL1516 0.0360 

31.750(1 !/4) 9.525(#/8) 7 550 9 250 770 940 6 500 9 500 DCL 166 0.0140 

31.750(1 !/4) 12.700(!/2) 11 500 15 800 1 170 1 610 6 500 9 500 DCL 168 0.0190 

31.750(1 !/4) 19.050(#/4) 18 600 29 500 1 890 3 000 6 500 9 500 DCL1612 0.0310 MI-121612 

31.750(1 !/4) 22.225(&/8) 22 100 37 000 2 260 3 750 6 500 9 500 DCL1614 0.0340 MI-121616 


EX. DCL128 + MI-081210 


B-49


NTN 

Inch series 

Type DCL 

FW 

25.40041.275mm 



mm (!/25.4mm) 



0 

0.2 


25.400(1) 

31.750(1 !/4) 25.400(1) 25 400 44 000 2 590 4 500 6 500 9 500 DCL1616 0.038 MI-121616 

31.750(1 !/4) 31.750(1 !/4) 31 500 58 000 3 200 5 900 6 500 9 500 DCL1620 0.048 

26.988(1 !/16) 33.338(1 %/16) 15.875(%/8) 15 900 24 600 1 620 2 510 6 000 9 000 DCL1710 0.025 

34.925(1 #/8) 9.525(#/8) 8 150 10 600 830 1 080 5 500 8 500 DCL 186 0.016 MI-141808 

34.925(1 #/8) 12.700(!/2) 12 400 18 200 1 260 1 850 5 500 8 500 DCL 188 0.021 MI-141808 

28.575(1 !/8) 34.925(1 #/8) 19.050(#/4) 20 100 34 000 2 050 3 450 5 500 8 500 DCL1812 0.032 MI-141812 

34.925(1 #/8) 25.400(1) 27 400 50 500 2 790 5 150 5 500 8 500 DCL1816 0.043 MI-141816 

34.925(1 #/8) 31.750(1 !/4) 34 000 66 500 3 450 6 800 5 500 8 500 DCL1820 0.053 MI-141820 

30.162(1 #/16) 38.100(1 !/2) 25.400(1) 33 000 54 000 3 350 5 500 5 500 8 000 DCL1916 0.057 

38.100(1 !/2) 12.700(!/2) 12 500 19 000 1 280 1 940 5 000 7 500 DCL 208 0.023 

38.100(1 !/2) 15.875(%/8) 16 400 27 000 1 670 2 750 5 000 7 500 DCL2010 0.029 

31.750(1 !/4) 38.100(1 !/2) 19.050(#/4) 20 300 35 500 2 070 3 600 5 000 7 500 DCL2012 0.036 

38.100(1 !/2) 25.400(1) 27 700 53 000 2 830 5 400 5 000 7 500 DCL2016 0.047 

38.100(1 !/2) 31.750(1 !/4) 34 500 70 000 3 500 7 100 5 000 7 500 DCL2020 0.058 

34.925(1 #/8) 

38.100(1 !/2) 

41.275(1 %/8) 

41.275(1 %/8) 12.700(!/2) 13 400 21 400 1 360 2 180 4 700 7 000 DCL 228 0.027 

41.275(1 %/8) 19.050(#/4) 21 700 40 000 2 210 4 050 4 700 7 000 DCL2212 0.038 

41.275(1 %/8) 25.400(1) 29 600 59 500 3 000 6 050 4 700 7 000 DCL2216 0.051 

41.275(1 %/8) 31.750(1 !/4) 36 500 78 500 3 750 8 000 4 700 7 000 DCL2220 0.064 

47.625(1 &/8) 12.700(!/2) 17 100 22 800 1 750 2 320 4 300 6 500 DCL 248 0.043 

47.625(1 &/8) 15.875(%/8) 21 000 29 700 2 150 3 050 4 300 6 500 DCL2410 0.054 

47.625(1 &/8) 19.050(#/4) 26 600 40 000 2 710 4 100 4 300 6 500 DCL2412 0.065 

47.625(1 &/8) 22.225(&/8) 32 000 50 500 3 250 5 150 4 300 6 500 DCL2414 0.076 MI-202416 

47.625(1 &/8) 25.400(1) 36 500 60 500 3 750 6 200 4 300 6 500 DCL2416 0.087 MI-202416 

47.625(1 &/8) 31.750(1 !/4) 46 500 82 000 4 750 8 350 4 300 6 500 DCL2420 0.107 MI-202420 

50.800(2) 12.700(!/2) 18 000 24 900 1 840 2 540 4 000 6 000 DCL 268 0.046 MI-222610 

50.800(2) 15.875(%/8) 22 100 32 500 2 260 3 300 4 000 6 000 DCL2610 0.058 MI-222610 

50.800(2) 25.400(1) 38 500 66 500 3 950 6 800 4 000 6 000 DCL2616 0.106 

50.800(2) 31.750(1 !/4) 49 000 90 000 5 000 9 150 4 000 6 000 DCL2620 0.116 MI-212620 


EX. DCL2414 + MI-202416 


B-50


NTN 

FW 

44.45050.800mm 



mm (!/25.4mm) 



0 

0.2 


53.975(2 !/8) 19.050(#/4) 29 200 47 500 2 980 4 850 3 700 5 500 DCL2812 0.074 MI-242812 

44.450(1 #/4) 53.975(2 !/8) 25.400(1) 40 500 72 000 4 100 7 350 3 700 5 500 DCL2816 0.099 MI-242816 

53.975(2 !/8) 38.100(1 !/2) 62 000 126 000 6 350 12 800 3 700 5 500 DCL2824 0.149 

57.150(2 !/4) 12.700(!/2) 19 700 29 200 2 000 2 980 3 300 5 000 DCL 308 0.053 

47.625(1 &/8) 57.150(2 !/4) 15.875(%/8) 24 200 38 000 2 460 3 900 3 300 5 000 DCL3010 0.066 

57.150(2 !/4) 25.400(1) 42 000 78 000 4 300 7 950 3 300 5 000 DCL3016 0.106 

50.800(2) 

60.325(2 #/8) 12.700(!/2) 20 400 31 500 2 080 3 200 3 100 4 700 DCL 328 0.056 

60.325(2 #/8) 25.400(1) 44 000 83 500 4 450 8 550 3 100 4 700 DCL3216 0.112 

60.325(2 #/8) 31.750(1 !/4) 55 500 113 000 5 650 11 500 3 100 4 700 DCL3220 0.140 

60.325(2 #/8) 38.100(1 !/2) 67 500 146 000 6 850 14 800 3 100 4 700 DCL3224 0.168 


EX. DCL2816 + MI-242816 


B-51

Drawn cup needle roller bearings for universal joint 

NTN 

Type HCK 

Standard type 

Waffle type 

FW 

1020mm 



mm N kgf kg 

standard type waffle type 

Fw D C b C1 Cr Cor Cr Cor (approx.) 

10 15 9.35 7.6 1.75 6 200 9 250 635 940 HCK1015 0.007 

11.656 17.1 11.85 9.6 2.25 8 850 13 800 905 1 400 HCK1217 0.011 

13 19 11.85 9.6 2.25 10 000 15 000 1 020 1 530 HCK1319 0.013 

14 20 11.85 9.6 2.25 10 500 16 600 1 070 1 690 HCK1420 0.014 

16 22 12.85 10.6 2.25 12 200 20 700 1 240 2 110 HCK1622 0.017 

18 24 13.85 11.6 2.25 13 900 25 300 1 420 2 580 HCK1824 0.021 

18 24.6 13.85 11.6 2.25 13 900 25 300 1 420 2 580 HCK1825 0.025 

20 27.9 15.82 13.1 2.72 17 800 31 000 1 810 3 150 HCK2028 0.037 

B-52

Machined Ring Needle Roller Bearings

Machined ring needle roller bearings 

NTN 

Machined Ring Needle Roller Bearings 

The machined ring of this bearing type contains needle 

rollers and a cage. And the outer ring and the needle 

rollers are inseparable from each other by means of 

double-side ribs on the outer ring or side plates. 

Because of its machined (solid) outer ring enabling to 

make it more rigid and to thereby upgrade the bearing 

accuracy, this bearing type is suitable for an application 

requiring high speed, high load and high running 

accuracy. These machined ring needle roller bearings are 

available in two types -- one without inner ring and 

another with inner ring -- considering the case of using a 

shaft as the direct raceway surface without using inner 

ring. 

Bearing type 

Applied shaft 

diameter (mm) 



Remarks 

Type RNA49 

712 

Type NA49 

RNA 49 5 T2 

Tail code 

Bore dia. No. 

Dimension series 

Type code 

Bearing with tail code T2 uses a polyamide 

resin cage and, therefore, it shall be used 

at allowable temperature 120˚C and, under 

continuous running, at 100˚C and less. 

The dimension series is in compliance 

with JIS B 1512 or ISO 15. 

59 

[Tail code] 

T2: Resin cage 

Type RNA49R 

14490 

With seal 

1458 

RNA 49 02 R 

Tail code 

Bore dia. No. 


Bearing with seal type (Tail code: L or LL) 

- synthetic rubber seal built in at single side 

or double sides is internally filled up with 

ithium soap base grease. 

Type NA49R 

10440 

With seal 

1050 

Type code 

[Tail code] 

R: Rib type 

L: Single-side seal type 

LL: Double-side seal type 

The sealed bearing type shall be used 

within the temperature range of -25 to 

100˚C to prevent deterioration of the seal 

and filled-up grease. 

The dimension series is in compliance with 

JIS B 15 or ISO 15. 

B-54


NTN 

Bearing type 

Applied shaft 

diameter (mm) 



Remarks 

Type RNA59 

RNA 59 02 

20160 

Type No. 


Type code 

Type NA59 

NA 59 22 

15140 

Type No. 


Type code 

Type RNA69R 

The dimension series is in compliance with 

JIS B 1512 or ISO 15. 

1635 

RNA 69 01 R 

40110 

Built-in cage 


Tail code 

Type No. 


Type code 

Type NA49R 

1230 

NA 69 22 

3295 

Built-in cage 


Type No. 


Type code 

B-55


NTN 

Bearing type 

Applied shaft 

diameter (mm) 



Remarks 

Type NK 

NK 7 10 T2 

512 

Tail code 

Width 


diameter 

Type code 

Type NK+IR 

NK2416R IR 20 24 16 

Type code 

Bore diameter 

59 


Width 

Type NKR 

Type MR 

(Inch series) 

NK 

14165 

[Tail code] 

R: Rib type 


MR 10 18 12 

Bearing with tail code T2 uses a 

polyamide resin cage and, 

therefore, it shall be used at 

allowable temperature 120˚C and, 

under continuous running, at 


Width code 

Outer diameter code 

MR 

15.875 

234.95 

Inscribed circle dia. code 

Type code 

NKType R+IR 

Type MR+MI 

(Inch series) 

NKRIR 

10150 

MR101812 MI 06 10 12 

Type code 


dia. code 


Width code 

Bearing Tolerances 

The dimensional accuracy, profile accuracy and 

running accuracy of machined ring needle roller bearings 

are specified in JIS B 1514 (Accuracy of Rolling 

Bearings). (Refer to Section 4 "Bearing Tolerances", 

Table 4.3 on page A-26.) Although the accuracy of NTN 

standard bearings conforms to JIS Class-0, NTN can also 

supply bearings conforming to JIS Class-6, -5 and -4. 

Feel free to contact NTN for the further detail of these 

bearings. 

The dimensional tolerances for the roller inscribed 

circle diameters (Fw) of bearing type NK, RNA and MR 

conform to ISO Tolerance Range Class-F6. Refer to this 

ISO Tolerance Class 

in selecting shaft diameter and radial clearance. 

Radial clearance and bearing fits 

NTN machined ring needle roller bearings (with inner 

ring) are all manufactured within the radial clearance 

range specified in Table 5.1 of Subsection 5.1 "Radial 

Clearance in Bearings" (page A-30). Because of the 

narrow non-interchangeable clearance range, the 

bearings shipped after adjusted to a specific noninterchangeable 

clearance must be installed with the 

clearance remained unchanged. 

The respective dimensional tolerances for shaft and 

housing bore sizes on/in which bearing with inner ring is 

press-fitted are per Table 6,3 of 6.4 "Recommended 

Bearing Fits" (page A-34) which specifies them 

according to load characteristic, load magnitude, and 

shaft and housing bore sizes.The profile accuracy and 

B-56


NTN 

surface roughness of shaft and housing to be applied are 

as specified in Table 7.3 of 7.3 "Shaft and Housing 

Accuracy" (page A-39). 

A shaft is used as the direct raceway surface for a 

bearing without inner ring and, in this case, the shaft 

diameter (raceway diameter) tolerance is per Table 1 

specifying the tolerances according to each running 

clearance. And K7 tolerance generally in broad use is 

applied as the dimensional tolerance for the housing 

bore. Feel free to contact NTN for application of housing 

bore tolerance other than K7. 

For the profile accuracy, surface roughness and 

hardness of a shaft acting as the raceway surface, refer 

to Table 7.4 of 7.4 "Raceway Surface Accuracy"(page 

A-39). 

Table 1 Shaft diameter (raceway diameter) tolerance 

Mounting relations 

In the case of raceway with an oil hole, the bearing 

must be installed so the oil hole locates within the nonload 

area. In addition, any bearing with inner ring must be 

used within the allowable stroking value (s) (with the 

rollers retained within the effective contact length range of 

inner ring). 

For the allowable stroking value (s), refer to Fig. 1 and 

applicable "Dimensions Table". 

The inner ring and outer ring of machined ring needle 

roller bearing must be positioned in axial direction by 

shoulder or snap ring in this case. For the shoulder 

dimension and corner roundness (ra) of the shaft and the 

housing are as specified in applicable "Dimensions 

Table". 

Roller inscribed circle dia. 

Fw 

mm 

Over incl. 

80 

160 

180 

200 

250 

315 

80 

160 

180 

200 

250 

315 

400 

Smaller than 

ordinary 

clearance 

k5 

k5 

k5 

j5 

j5 

h5 

g5 

Tolerance range class for shaft 

Ordinary class 

h5 

g5 

g5 

g5 

f6 

f6 

f6 

Larger than 

ordinary 

clearance 

f6 

f6 

e6 

e6 

e6 

e6 

d6 

s 

Dimension of oil hole in outer ring 

The outer ring is provided with an oil hole and an oil 

groove to facilitate oil lubrication to bearing. (but 

excluding Type NK with roller inscribed circle diameter 

(Fw) of 12mm and less.) 

Table 2 shows the oil hole dimension every outer ring 

diameter. 

Fig. 1 

Table 2 Oil hole dimension 

Outer ring outer diameter 

Over incl. 

 

20 

40 

80 

200 

350 

20 

40 

80 

200 

350 

 

Oil hole dia. (mm) 

2.0 

2.5 

3.0 

3.5 

4.0 

5.0 

Number of 

oil hole 

1 

1 

1 

1 

1 

1 

B-57


NTN 

Without Inner Ring 

C 

C 

C 

Type RNA49 

Type RNA59 

Type RNA69 

Type NK 

D 

r 

FW 

D 

r 

FW 

D 

r 

FW 

Type NK 

FW12mm 

 

Type RNA49FW12mm 

 

Type RNA49RFW14mm 

Type RNA59 

Type RNA69R 

Type NKRFW14mm 

 

FW 

516mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing Abutment Mass 

dimensions 


mm N kgf r/min mm kg 

grease oil Da ras 

Fw D C rs min 1) Cr Cor Cr Cor max max (approx.) 

+0.018 

5 +0.010 

+0.018 

6 +0.010 

10 10 0.15 2 640 2 190 269 224 27 000 40 000 NK5/10T2 6.5 0.15 0.0031 

10 12 0.15 2 720 2 250 277 230 27 000 40 000 NK5/12T2 6.5 0.15 0.0037 

12 10 0.15 2 660 2 280 272 233 25 000 37 000 NK6/10T2 7.5 0.15 0.0047 

12 12 0.15 3 400 3 150 345 320 25 000 37 000 NK6/12T2 7.5 0.15 0.0057 

13 10 0.15 2 670 2 350 272 239 23 000 34 000 RNA495T2 8.5 0.15 0.0055 

+0.022 

7 +0.013 14 

14 

10 

12 

0.3 

0.3 

2 670 

3 400 

2 350 

3 200 

272 

345 

239 

330 

23 000 

23 000 

34 000 

34 000 

NK7/10T2 

NK7/12T2 

8.5 

8.5 

0.3 

0.3 

0.0069 

0.0082 

15 10 0.15 3 150 3 000 320 305 21 000 32 000 RNA496 9.5 0.15 0.0073 

+0.022 

8 +0.013 15 

15 

12 

16 

0.3 

0.3 

4 000 

4 850 

4 100 

5 200 

410 

495 

420 

535 

21 000 

21 000 

32 000 

32 000 

NK8/12T2 

NK8/16T2 

9.5 

9.5 

0.3 

0.3 

0.0087 

0.0120 

16 12 0.3 4 550 5 000 465 510 20 000 30 000 NK9/12T2 10.5 0.3 0.0100 

+0.022 

9 +0.013 16 

17 

16 

10 

0.3 

0.15 

5 500 

3 600 

6 400 

3 650 

560 

365 

650 

375 

20 000 

20 000 

30 000 

30 000 

NK9/16T2 

RNA497 

10.5 

10.5 

0.3 

0.15 

0.0130 

0.0095 

17 12 0.3 4 550 5 100 460 520 19 000 28 000 NK10/12T2 11.5 0.3 0.0100 

+0.022 

10 +0.013 17 

19 

16 

11 

0.3 

0.15 

5 450 

4 300 

6 450 

3 950 

555 

435 

660 

405 

19 000 

19 000 

28 000 

28 000 

NK10/16 

RNA498 

11.5 

12 

0.3 

0.15 

0.0130 

0.0130 

19 12 0.3 5 000 6 100 510 620 17 000 26 000 NK12/12 13.5 0.3 0.0130 

+0.027 

12 +0.016 19 

20 

16 

11 

0.3 

0.3 

6 000 

4 850 

7 700 

4 900 

615 

495 

785 

500 

17 000 

17 000 

26 000 

26 000 

NK12/16 

RNA499 

13.5 

14 

0.3 

0.3 

0.0160 

0.0130 

22 13 0.3 8 600 9 200 875 935 16 000 24 000 RNA4900R 20 0.3 0.0170 

+0.027 

14 +0.016 22 16 0.3 10 300 11 500 1 050 1 170 16 000 24 000 NK14/16R 20 0.3 0.0210 

22 20 0.3 13 000 15 600 1 330 1 590 16 000 24 000 NK14/20R 20 0.3 0.0260 

+0.027 

15 +0.016 

+0.027 

16 +0.016 

23 16 0.3 10 900 12 700 1 110 1 290 15 000 23 000 NK15/16R 21 0.3 0.0220 

23 20 0.3 13 800 17 200 1 410 1 750 15 000 23 000 NK15/20R 21 0.3 0.0270 

24 13 0.3 9 550 10 900 975 1 110 15 000 23 000 RNA4901R 22 0.3 0.0170 

24 16 0.3 12 200 14 900 1 240 1 520 15 000 23 000 NK16/16R 22 0.3 0.0220 

24 20 0.3 14 600 18 800 1 490 1 920 15 000 23 000 NK16/20R 22 0.3 0.0280 

24 22 0.3 15 400 20 000 1 570 2 040 15 000 23 000 RNA6901R 22 0.3 0.0310 

Note 1) Allowable minimum chamfer dimension r. 

B-58


NTN 

ra 

ra 

Da 

Da 

FW 

1728mm 


dimensions 





+0.027 

17 +0.016 

+0.027 

18 +0.016 

+0.033 

19 +0.020 

25 16 0.3 12 100 15 000 1 240 1 530 15 000 22 000 NK17/16R 23 0.3 0.024 

25 20 0.3 15 400 20 400 1 570 2 080 15 000 22 000 NK17/20R 23 0.3 0.030 

26 16 0.3 12 700 16 200 1 300 1 650 14 000 21 000 NK18/16R 24 0.3 0.025 

26 20 0.3 16 100 22 000 1 640 2 250 14 000 21 000 NK18/20R 24 0.3 0.031 

27 16 0.3 13 300 17 400 1 350 1 780 14 000 21 000 NK19/16R 25 0.3 0.026 

27 20 0.3 16 000 22 200 1 630 2 260 14 000 21 000 NK19/20R 25 0.3 0.032 

28 13 0.3 10 300 12 800 1 050 1 310 13 000 20 000 RNA4902R 26 0.3 0.022 

28 16 0.3 13 200 17 500 1 340 1 790 13 000 20 000 NK20/16R 26 0.3 0.027 

+0.033 

20 +0.020 28 18 0.3 14 100 19 100 1 440 1 950 13 000 20 000 RNA5902 26 0.3 0.033 

28 20 0.3 16 700 23 800 1 700 2 420 13 000 20 000 NK20/20R 26 0.3 0.034 

28 23 0.3 17 600 25 300 1 790 2 580 13 000 20 000 RNA6902R 26 0.3 0.040 

+0.033 

21 +0.020 

29 16 0.3 13 700 18 700 1 400 1 910 13 000 19 000 NK21/16R 27 0.3 0.028 

29 20 0.3 18 300 27 100 1 860 2 760 13 000 19 000 NK21/20R 27 0.3 0.035 

30 16 0.3 14 200 19 900 1 450 2 030 12 000 18 000 NK22/16R 28 0.3 0.034 

30 20 0.3 18 000 27 000 1 840 2 760 12 000 18 000 NK22/20R 28 0.3 0.037 

+0.033 

22 +0.020 30 13 0.3 11 200 14 600 1 140 1 490 12 000 18 000 RNA4903R 28 0.3 0.022 

30 18 0.3 15 200 21 700 1 550 2 210 12 000 18 000 RNA5903 28 0.3 0.035 

30 23 0.3 18 200 27 200 1 850 2 770 12 000 18 000 RNA6903R 28 0.3 0.042 

+0.033 

24 +0.020 

32 16 0.3 15 200 22 300 1 550 2 280 11 000 170 00 NK24/16R 30 0.3 0.032 

32 20 0.3 18 600 28 800 1 890 2 930 11 000 17 000 NK24/20R 30 0.3 0.040 

33 16 0.3 15 100 22 400 1 540 2 280 11 000 16 000 NK25/16R 31 0.3 0.033 

33 20 0.3 19 200 30 500 1 960 3 100 11 000 16 000 NK25/20R 31 0.3 0.042 

+0.033 

25 +0.020 37 17 0.3 21 300 25 500 2 170 2 600 11 000 16 000 RNA4904R 35 0.3 0.052 

37 23 0.3 28 400 37 000 2 900 3 750 11 000 16 000 RNA5904 35 0.3 0.084 

37 30 0.3 36 500 50 500 3 700 5 150 11 000 16 000 RNA6904R 35 0.3 0.100 

+0.033 

26 +0.020 

34 16 0.3 15 600 23 600 1 590 2 410 10 000 15 000 NK26/16R 32 0.3 0.034 

34 20 0.3 19 100 30 500 1 940 3 100 10 000 15 000 NK26/20R 32 0.3 0.042 

+0.033 37 20 0.3 22 300 34 000 2 280 3 450 9 500 14 000 NK28/20R 35 0.3 0.052 

28 +0.020 

37 30 0.3 26 700 48 000 2 720 4 900 9 500 14 000 NK28/30R 35 0.3 0.082 


B-59


NTN 


Type RNA49 

Type RNA59 

Type RNA69 

Type NK 

D 

C 

r 

FW 

D 

C 

r 

FW 

Type RNA49R 

Type RNA69Type RFW40mm 

Type RNA59 

Type RNA69RFW35mm 

Type NKR 

FW 

2840mm 


dimensions 





39 17 0.3 23 200 29 300 2 360 2 990 9 500 14 000 RNA49/22R 37 0.3 0.050 

+0.033 

28 +0.020 39 23 0.3 26 400 37 500 2 690 3 850 9 500 14 000 RNA59/22 37 0.3 0.092 

39 30 0.3 40 000 58 500 4 050 6 000 9 500 14 000 RNA69/22R 37 0.3 0.100 

+0.033 

29 +0.020 

38 20 0.3 22 200 34 000 2 270 3 450 9 500 14 000 NK29/20R 36 0.3 0.054 

38 30 0.3 27 500 50 500 2 810 5 150 9 500 14 000 NK29/30R 36 0.3 0.084 

40 20 0.3 22 100 34 000 2 260 3 500 8 500 13 000 NK30/20R 38 0.3 0.065 

40 30 0.3 33 000 57 000 3 350 5 800 8 500 13 000 NK30/30R 38 0.3 0.098 

+0.033 

30 +0.020 42 17 0.3 24 000 31 500 2 450 3 200 8 500 13 000 RNA4905R 40 0.3 0.061 

42 23 0.3 30 500 43 000 3 150 4 350 8 500 13 000 RNA5905 40 0.3 0.101 

42 30 0.3 41 500 63 000 4 200 6 400 8 500 13 000 RNA6905R 40 0.3 0.112 

42 20 0.3 23 500 37 500 2 400 3 850 8 500 13 000 NK32/20R 40 0.3 0.068 

42 30 0.3 34 000 60 500 3 450 6 150 8 500 13 000 NK32/30R 40 0.3 0.102 

+0.041 

32 +0.025 45 17 0.3 24 800 33 500 2 530 3 400 8 500 13 000 RNA49/28R 43 0.3 0.073 

45 23 0.3 32 000 45 500 3 250 4 650 8 500 13 000 RNA59/28 43 0.3 0.108 

45 30 0.3 43 000 67 000 4 350 6 850 8 500 13 000 RNA69/28R 43 0.3 0.135 

45 20 0.3 24 800 41 500 2 520 4 250 7 500 11 000 NK35/20R 43 0.3 0.074 

45 30 0.3 36 000 66 500 3 650 6 800 7 500 11 000 NK35/30R 43 0.3 0.112 

+0.041 

35 +0.025 47 17 0.3 25 500 35 500 2 600 3 600 7 500 11 000 RNA4906R 45 0.3 0.069 

47 23 0.3 32 500 48 500 3 350 4 950 7 500 11 000 RNA5906 45 0.3 0.108 

47 30 0.3 42 500 67 500 4 300 6 900 7 500 11 000 RNA6906R 45 0.3 0.126 

+0.041 

37 +0.025 

+0.041 

38 +0.025 

47 20 0.3 25 300 43 500 2 580 4 400 7 500 11 000 NK37/20R 45 0.3 0.077 

47 30 0.3 36 500 69 500 3 750 7 100 7 500 11 000 NK37/30R 45 0.3 0.107 

48 20 0.3 25 900 45 000 2 640 4 600 7 500 11 000 NK38/20R 46 0.3 0.079 

48 30 0.3 37 500 73 000 3 850 7 400 7 500 11 000 NK38/30R 46 0.3 0.107 

50 20 0.3 26 400 47 000 2 700 4 800 6 500 10 000 NK40/20R 48 0.3 0.083 

50 30 0.3 38 500 76 000 3 900 7 750 6 500 10 000 NK40/30R 48 0.3 0.125 

+0.041 

40 +0.025 52 20 0.6 31 500 47 500 3 200 4 850 6 500 10 000 RNA49/32R 48 0.6 0.089 

52 27 0.6 38 000 61 000 3 850 6 250 6 500 10 000 RNA59/32 48 0.6 0.149 

52 36 0.6 47 500 82 000 4 850 8 350 6 500 10 000 RNA69/32R 48 0.6 0.162 


B-60


NTN 

ra 

ra 

Da 

Da 

FW 

4263mm 


dimensions 





52 20 0.3 26 900 49 000 2 750 5 000 6 500 9 500 NK42/20R 50 0.3 0.086 

52 30 0.3 39 000 79 000 4 000 8 050 6 500 9 500 NK42/30R 50 0.3 0.130 

+0.041 

42 +0.025 55 20 0.6 32 000 50 000 3 300 5 100 6 500 9 500 RNA4907R 51 0.6 0.107 

55 27 0.6 39 000 64 500 3 950 6 550 6 500 9 500 RNA5907 51 0.6 0.176 

55 36 0.6 49 000 86 500 5 000 8 800 6 500 9 500 RNA6907R 51 0.6 0.193 

+0.041 

43 +0.025 

+0.041 

45 +0.025 

+0.041 

47 +0.025 

53 20 0.3 27 500 51 000 2 810 5 200 6 500 9 500 NK43/20R 51 0.3 0.086 

53 30 0.3 40 000 82 000 4 100 8 400 6 500 9 500 NK43/30R 51 0.3 0.133 

55 20 0.3 28 000 52 500 2 860 5 400 6 000 9 000 NK45/20R 53 0.3 0.092 

55 30 0.3 41 000 85 500 4 150 8 700 6 000 9 000 NK45/30R 53 0.3 0.139 

57 20 0.3 28 800 55 500 2 940 5 650 5 500 8 500 NK47/20R 55 0.3 0.095 

57 30 0.3 42 500 91 500 4 350 9 350 5 500 8 500 NK47/30R 55 0.3 0.142 

62 22 0.6 43 500 66 500 4 450 6 800 5 500 8 500 RNA4908R 58 0.6 0.140 

+0.041 

48 +0.025 62 30 0.6 53 000 92 500 5 450 9 450 5 500 8 500 RNA5908 58 0.6 0.225 

62 40 0.6 67 000 116 000 6 850 11 800 5 500 8 500 RNA6908R 58 0.6 0.256 

+0.041 

50 +0.025 

62 25 0.6 38 500 74 500 3 950 7 550 5 500 8 000 NK50/25R 58 0.6 0.158 

62 35 0.6 51 000 106 000 5 200 10 800 5 500 8 000 NK50/35R 58 0.6 0.221 

68 22 0.6 46 000 73 000 4 700 7 450 5 000 7 500 RNA4909R 64 0.6 0.182 

+0.049 

52 +0.030 68 30 0.6 56 000 101 000 5 700 10 300 5 000 7 500 RNA5909 64 0.6 0.232 

68 40 0.6 70 500 127 000 7 200 13 000 5 000 7 500 RNA6909R 64 0.6 0.273 

+0.049 

55 +0.030 

68 25 0.6 41 000 82 000 4 150 8 400 5 000 7 500 NK55/25R 64 0.6 0.193 

68 35 0.6 54 000 118 000 5 500 12 000 5 000 7 500 NK55/35R 64 0.6 0.267 

72 22 0.6 48 000 80 000 4 900 8 150 4 700 7 000 RNA4910R 68 0.6 0.163 

+0.049 

58 +0.030 72 30 0.6 58 000 110 000 5 950 11 200 4 700 7 000 RNA5910 68 0.6 0.289 

72 40 0.6 74 000 139 000 7 500 14 200 4 700 7 000 RNA6910R 68 0.6 0.320 

+0.049 

60 +0.030 

+0.049 

63 +0.030 

72 25 0.6 41 000 85 000 4 200 8 700 4 300 6 500 NK60/25R 68 0.6 0.185 

72 35 0.6 57 000 130 000 5 800 13 200 4 300 6 500 NK60/35R 68 0.6 0.258 

80 25 1 58 500 99 500 6 000 10 100 4 300 6 500 RNA4911R 75 1 0.255 

80 34 1 76 500 140 000 7 800 14 300 4 300 6 500 RNA5911 75 1 0.367 


B-61


NTN 


Type RNA49 

Type RNA59 

Type RNA69 

Type NK 

D 

C 

r 

FW 

D 

C 

r 

FW 

Type RNA48 

Type RNA49RType RNA49 

RNA59 type 

Type NKRType NK 

Type RNA69R 

FW 

6385mm 


dimensions 





+0.049 

63 +0.030 80 45 1 94 000 183 000 9 600 18 600 4 300 6 500 RNA6911R 75 1 0.470 

+0.049 

65 +0.030 

78 25 0.6 45 000 98 000 4 550 10 000 4 000 6 000 NK65/25R 74 0.6 0.221 

78 35 0.6 60 000 142 000 6 100 14 400 4 000 6 000 NK65/35R 74 0.6 0.310 

82 25 1 44 500 89 000 4 500 9 050 4 000 6 000 NK68/25R 77 0.6 0.241 

82 35 0.6 63 000 139 000 6 400 14 200 4 000 6 000 NK68/35R 78 0.6 0.338 

+0.049 

68 +0.030 85 25 1 61 500 108 000 6 250 11 000 4 000 6 000 RNA4912R 80 1 0.275 

85 34 1 80 500 153 000 8 200 15 600 4 000 6 000 RNA5912 80 1 0.408 

85 45 1 95 500 191 000 9 750 19 400 4 000 6 000 RNA6912R 80 1 0.488 

+0.049 

70 +0.030 

85 25 0.6 45 000 91 500 4 600 9 350 3 700 5 500 NK70/25R 81 0.6 0.275 

85 35 0.6 64 000 144 000 6 550 14 700 3 700 5 500 NK70/35R 81 0.6 0.386 

90 25 1 62 500 112 000 6 350 11 400 3 700 5 500 RNA4913R 85 1 0.312 

+0.049 

72 +0.030 90 34 1 84 000 165 000 8 600 16 800 3 700 5 500 RNA5913 85 1 0.462 

90 45 1 97 000 198 000 9 900 20 200 3 700 5 500 RNA6913R 85 1 0.520 

+0.049 

73 +0.030 

+0.049 

75 +0.030 

90 25 0.6 54 000 100 000 5 500 10 200 3 700 5 500 NK73/25R 86 0.6 0.302 

90 35 0.6 76 500 156 000 7 800 16 000 3 700 5 500 NK73/35R 86 0.6 0.428 

92 25 0.6 55 000 104 000 5 600 10 600 3 700 5 500 NK75/25R 88 0.6 0.315 

92 35 0.6 78 000 162 000 7 950 16 500 3 700 5 500 NK75/35R 88 0.6 0.492 

95 25 1 57 000 119 000 5 800 12 200 3 300 5 000 NK80/25R 90 1 0.301 

95 35 1 79 500 184 000 8 150 18 700 3 300 5 000 NK80/35R 90 1 0.425 

+0.049 

80 +0.030 100 30 1 85 500 156 000 8 750 15 900 3 300 5 000 RNA4914R 95 1 0.460 

100 40 1 103 000 187 000 10 500 19 100 3 300 5 000 RNA5914 95 1 0.706 

100 54 1 130 000 267 000 13 300 27 200 3 300 5 000 RNA6914R 95 1 0.857 

105 25 1 70 500 123 000 7 200 12 600 3 100 4 700 NK85/25R 100 1 0.404 

105 30 1 87 000 162 000 8 900 16 500 3 100 4 700 RNA4915R 100 1 0.489 

+0.058 

85 +0.036 105 35 1 100 000 193 000 10 200 19 700 3 100 4 700 NK85/35R 100 1 0.517 

105 40 1 109 000 205 000 11 100 20 900 3 100 4 700 RNA5915 100 1 0.745 

105 54 1 132 000 277 000 13 500 28 300 3 100 4 700 RNA6915R 100 1 0.935 


B-62


NTN 

ra 

ra 

Da 

Da 

FW 

90130mm 


and fillet 

dynamic static dynamic static numbers dimensions 



Fw D Be rs min 1 Cr Cor Cr Cor max max (approx.) 

110 25 1 71 500 128 000 7 300 13 100 2 900 4 400 NK90/25R 105 1 0.426 

110 30 1 90 500 174 000 9 250 17 700 2 900 4 400 RNA4916R 105 1 0.516 

+0.058 

90 +0.036 110 35 1 104 000 208 000 10 600 21 200 2 900 4 400 NK90/35R 105 1 0.604 

110 40 1 115 000 223 000 11 700 22 700 2 900 4 400 RNA5916 105 1 0.787 

110 54 1 137 000 298 000 14 000 30 500 2 900 4 400 RNA6916R 105 1 0.987 

+0.058 115 26 1 74 500 137 000 7 600 14 000 2 800 4 200 NK95/26R 110 1 0.364 

95 +0.036 

115 36 1 108 000 223 000 11 100 22 700 2 800 4 200 NK95/36R 110 1 0.652 

120 26 1 73 500 137 000 7 500 14 000 2 700 4 000 NK100/26R 115 1 0.487 

120 35 1.1 112 000 237 000 11 500 24 200 2 700 4 000 RNA4917R 113.5 1 0.657 

+0.058 

100 +0.036 120 36 1 107 000 223 000 11 000 22 800 2 700 4 000 NK100/36R 115 1 0.679 

120 46 1.1 137 000 290 000 14 000 29 600 2 700 4 000 RNA5917 113.5 1 1.00 

120 63 1.1 169 000 400 000 17 300 41 000 2 700 4 000 RNA6917R 113.5 1 1.20 

125 26 1 76 500 147 000 7 800 14 900 2 500 3 800 NK105/26R 120 1 0.506 

125 35 1.1 116 000 252 000 11 900 25 700 2 500 3 800 RNA4918R 118.5 1 0.697 

+0.058 

105 +0.036 125 36 1 111 000 238 000 11 400 24 300 2 500 3 800 NK105/36R 120 1 0.713 

125 46 1.1 143 000 310 000 14 600 32 000 2 500 3 800 RNA5918 118.5 1 1.04 

125 63 1.1 175 000 425 000 17 900 43 500 2 500 3 800 RNA6918R 118.5 1 1.33 

130 30 1.1 97 500 204 000 9 950 20 800 2 400 3 600 NK110/30R 123.5 1 0.612 

130 35 1.1 118 000 260 000 12 000 26 500 2 400 3 600 RNA4919R 123.5 1 0.719 

+0.058 

110 +0.036 130 40 1.1 129 000 292 000 13 100 29 700 2 400 3 600 NK110/40R 123.5 1 0.830 

130 46 1.1 149 000 335 000 15 200 34 000 2 400 3 600 RNA5919 123.5 1 1.13 

130 63 1.1 177 000 440 000 18 100 45 000 2 400 3 600 RNA6919R 123.5 1 1.46 

+0.058 140 40 1.1 127 000 260 000 12 900 26 500 2 300 3 500 RNA4920 133.5 1 1.15 

115 +0.036 

140 54 1.1 182 000 395 000 18 600 40 500 2 300 3 500 RNA5920 133.5 1 1.76 

+0.058 140 30 1 93 500 210 000 9 550 21 400 2 200 3 300 RNA4822 135 1 0.670 

120 +0.036 

140 40 1.1 113 000 268 000 11 500 27 300 2 200 3 300 NK120/40 133.5 1 0.910 

+0.068 150 40 1.1 131 000 279 000 13 300 28 400 2 100 3 200 RNA4922 143.5 1 1.24 

125 +0.043 

150 54 1.1 193 000 440 000 19 700 45 000 2 100 3 200 RNA5922 143.5 1 1.89 

+0.068 

130 +0.043 150 30 1 99 500 233 000 10 100 23 800 2 100 3 100 RNA4824 145 1 0.730 


B-63


NTN 


Type RNA48 

Type RNA49 

Type RNA59 

Type NK 

D 

C 

r 

FW 

FW 

130220mm 


dimensions 





+0.068 

130 +0.043 150 40 1.1 116 000 283 000 11 800 28 800 2 100 3 100 NK130/40 143.5 1 0.98 

+0.068 165 45 1.1 180 000 380 000 18 300 38 500 2 000 3 000 RNA4924 158.5 1 1.86 

135 +0.043 

165 60 1.1 245 000 525 000 25 000 53 500 2 000 3 000 RNA5924 158.5 1 2.67 

165 35 1.1 118 000 305 000 12 100 31 000 1 900 2 800 RNA4826 158.5 1 0.95 

+0.068 

145 +0.043 170 32 1.5 111 000 238 000 11 300 24 300 1 900 2 800 NK145/32 162.5 1.5 1.12 

170 42 1.5 153 000 360 000 15 600 36 500 1 900 2 800 NK145/42 162.5 1.5 1.49 

+0.068 180 50 1.5 202 000 455 000 20 600 46 500 1 800 2 700 RNA4926 172 1.5 2.21 

150 +0.043 

180 67 1.5 294 000 685 000 30 000 70 000 1 800 2 700 RNA5926 172 1.5 3.21 

175 35 1.1 121 000 315 000 12 300 32 500 1 700 2 600 RNA4828 168.5 1 1.02 

+0.068 

155 +0.043 180 32 1.5 114 000 252 000 11 600 25 700 1 700 2 600 NK155/32 172 1.5 1.20 

180 42 1.5 156 000 380 000 16 000 38 500 1 700 2 600 NK155/42 172 1.5 1.59 

+0.068 190 50 1.5 209 000 485 000 21 300 49 500 1 700 2 500 RNA4928 182 1.5 2.35 

160 +0.043 

190 67 1.5 310 000 755 000 31 500 77 000 1 700 2 500 RNA5928 182 1.5 3.48 

190 32 1.5 117 000 265 000 11 900 27 000 1 600 2 400 NK165/32 182 1.5 1.42 

+0.068 

165 +0.043 190 40 1.1 152 000 390 000 15 500 40 000 1 600 2 400 RNA4830 183.5 1 1.60 

190 42 1.5 160 000 400 000 16 300 40 500 1 600 2 400 NK165/42 182 1.5 1.66 

+0.068 

170 +0.043 210 60 2 261 000 610 000 26 600 62 500 1 600 2 400 RNA4930 201 2 2.98 

+0.068 

175 +0.043 200 40 1.1 160 000 425 000 16 300 43 500 1 500 2 300 RNA4832 193.5 1 1.70 

+0.068 

180 +0.043 220 60 2 270 000 650 000 27 600 66 500 1 500 2 200 RNA4932 211 2 3.10 

+0.079 

185 +0.050 215 45 1.1 185 000 495 000 18 800 50 500 1 500 2 200 RNA4834 208.5 1 2.54 

+0.079 

190 +0.050 230 60 2 279 000 690 000 28 500 70 500 1 400 2 100 RNA4934 221 2 3.22 

+0.079 

195 +0.050 225 45 1.1 195 000 540 000 19 800 55 000 1 400 2 100 RNA4836 218.5 1 2.68 

+0.079 

205 +0.050 250 69 2 375 000 890 000 38 500 90 500 1 300 2 000 RNA4936 241 2 4.48 

+0.079 

210 +0.050 240 50 1.5 227 000 680 000 23 200 69 000 1 300 1 900 RNA4838 232 1.5 3.21 

+0.079 

215 +0.050 260 69 2 390 000 945 000 40 000 96 500 1 300 1 900 RNA4938 251 2 4.53 

+0.079 

220 +0.050 250 50 1.5 231 000 705 000 23 600 71 500 1 200 1 800 RNA4840 242 1.5 3.35 


B-64


NTN 

ra 

Da 

FW 

225490mm 


and fillet 




Fw D Be rs min 1 Cr Cor Cr Cor max max (approx.) 

+0.079 225 +0.050 280 80 2.1 505 000 1 180 000 51 500 120 000 1 200 1 800 RNA4940 269 2 7.20 

+0.079 

240 +0.050 270 50 1.5 242 000 770 000 24 700 78 500 1 100 1 700 RNA4844 262 1.5 3.62 

+0.079 

245 +0.050 300 80 2.1 525 000 1 270 000 53 500 129 000 1 100 1 600 RNA4944 289 2 7.81 

+0.088 300 60 2 360 000 1 080 000 37 000 110 000 1 000 1 500 RNA4848 291 2 5.40 

265 +0.056 

320 80 2.1 540 000 1 350 000 55 000 138 000 1 000 1 500 RNA4948 309 2 8.40 

+0.088 

285 +0.056 320 60 2 375 000 1 160 000 38 000 119 000 950 1 400 RNA4852 311 2 5.80 

+0.088 

290 +0.056 360 100 2.1 805 000 1 900 000 82 000 193 000 950 1 400 RNA4952 349 2 15.90 

+0.088 

305 +0.056 350 69 2 455 000 1 300 000 46 500 133 000 850 1 300 RNA4856 341 2 9.30 

+0.088 

310 +0.056 380 100 2.1 835 000 2 030 000 85 000 207 000 850 1 300 RNA4956 369 2 16.70 

+0.098 

330 +0.062 380 80 2.1 625 000 1 770 000 64 000 180 000 800 1 200 RNA4860 369 2 12.70 

+0.098 

340 +0.062 420 118 3 1 080 000 2 640 000 110 000 269 000 800 1 200 RNA4960 407 2.5 24.00 

+0.098 

350 +0.062 400 80 2.1 640 000 1 850 000 65 500 189 000 750 1 100 RNA4864 389 2 13.40 

+0.098 

360 +0.062 440 118 3 1 120 000 2 820 000 114 000 288 000 750 1 100 RNA4964 427 2.5 25.20 

+0.098 

370 +0.062 420 80 2.1 655 000 1 940 000 66 500 197 000 750 1 100 RNA4868 409 2 14.00 

+0.098 

380 +0.062 460 118 3 1 160 000 3 000 000 118 000 305 000 750 1 100 RNA4968 447 2.5 26.50 

+0.098 

390 +0.062 440 80 2.1 665 000 2 020 000 68 000 206 000 650 1 000 RNA4872 429 2 14.80 

+0.108 

400 +0.068 480 118 3 1 200 000 3 200 000 122 000 325 000 650 1 000 RNA4972 467 2.5 28.20 

+0.108 

415 +0.068 480 100 2.1 1 000 000 2 840 000 102 000 289 000 650 950 RNA4876 469 2 26.00 

+0.108 

430 +0.068 520 140 4 1 400 000 3 750 000 143 000 385 000 650 950 RNA4976 504 3 38.60 

+0.108 

450 +0.068 540 140 4 1 450 000 4 000 000 148 000 410 000 600 900 RNA4980 524 3 40.10 

+0.108 

470 +0.068 560 140 4 1 500 000 4 250 000 153 000 430 000 550 850 RNA4984 544 3 51.60 

+0.108 

490 +0.068 600 160 4 1 750 000 4 600 000 179 000 470 000 550 800 RNA4988 584 3 66.90 


B-65


NTN 

With inner ring 

Type NA49 

Type NA59 

Type NA69 

Type NKIR 

D 

r 

C 

r 

d F 

D 

r 

C 

r 

d F 

D 

r 

C 

r 

d F 

Type NA49d9mm Type NKIRd9mm Type NA49Rd10mm 

Type NA59 

Type NA69R 

Type NKIRd10mm 

d 

517mm 

Boundary dimensions Basic load ratings Limiting speeds Bearing numbers 



grease oil 

d D C rs min 1) F s 2) Cr Cor Cr Cor 

13 10 0.15 7 2 670 2 350 272 239 23 000 34 000 NA495T2 

5 15 12 0.3 8 1.5 4 000 4 100 410 420 21 000 32 000 NK8/12T2IR5812 

15 16 0.3 8 2 4 850 5 200 495 535 21 000 32 000 NK8/16T2IR5816 

15 10 0.15 8 3 150 3 000 320 305 21 000 32 000 NA496 

6 16 12 0.3 9 1.5 4 550 5 000 465 510 20 000 30 000 NK9/12T2IR6912 

16 16 0.3 9 2 5 500 6 400 560 650 20 000 30 000 NK9/16T2IR6916 

17 10 0.15 9 3 600 3 650 365 375 20 000 30 000 NA497 

7 17 12 0.3 10 1.5 4 550 5 100 460 520 19 000 28 000 NK10/12T2IR71012 

17 16 0.3 10 2 5 450 6 450 555 660 19 000 28 000 NK10/16IR71016 

8 19 11 0.15 10 4 300 3 950 435 405 19 000 28 000 NA498 

19 12 0.3 12 1.5 5 000 6 100 510 620 17 000 26 000 NK12/12IR91212 

9 19 16 0.3 12 2 6 000 7 700 615 785 17 000 26 000 NK12/16IR91216 

20 11 0.3 12 4 850 4 900 495 500 17 000 26 000 NA499 

22 13 0.3 14 0.5 8 600 9 200 875 935 16 000 24 000 NA4900R 

10 22 16 0.3 14 0.5 10 300 11 500 1 050 1 170 16 000 24 000 NK14/16RIR101416 

22 20 0.3 14 0.5 13 000 15 600 1 330 1 590 16 000 24 000 NK14/20RIR101420 

12 

24 13 0.3 16 0.5 9 550 10 900 975 1 110 15 000 23 000 NA4901R 

24 16 0.3 16 0.5 12 200 14 900 1 240 1 520 15 000 23 000 NK16/16RIR121616 

24 20 0.3 16 0.5 14 600 18 800 1 490 1 920 15 000 23 000 NK16/20RIR121620 

24 22 0.3 16 1 15 400 20 000 1 570 2 040 15 000 23 000 NA6901R 

27 16 0.3 19 0.5 13 300 17 400 1 350 1 780 14 000 21 000 NK19/16RIR151916 

27 20 0.3 19 0.5 16 000 22 200 1 630 2 260 14 000 21 000 NK19/20RIR151920 

15 28 13 0.3 20 0.5 10 300 12 800 1 050 1 310 13 000 20 000 NA4902R 

28 18 0.3 20 0.5 14 100 19 100 1 440 1 950 13 000 20 000 NA5902 

28 23 0.3 20 1 17 600 25 300 1 790 2 580 13 000 20 000 NA6902R 

17 

29 16 0.3 21 0.5 13 700 18 700 1 400 1 910 13 000 19 000 NK21/16RIR172116 

29 20 0.3 21 0.5 18 300 27 100 1 860 2 760 13 000 19 000 NK21/20RIR172120 

30 13 0.3 22 0.5 11 200 14 600 1 140 1 490 12 000 18 000 NA4903R 

30 18 0.3 22 0.5 15 200 21 700 1 550 2 210 12 000 18 000 NA5903 

Note 1) Allowable minimum chamfer dimension r . 2) Allowable axial stroking value of inner ring against outer ring. 

Remarks: Nominal code number of inner ring (IR) comprises the codes of IR bore diameterouter diameterwidth. 

B-66


NTN 

ra 

ra 

s 

ra 

ra 

Da 

da 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 

min max max (approx.) 

6.2 8.5 0.15 0.007 

7 9.5 0.3 0.012 

7 9.5 0.3 0.016 

8 9.5 0.15 0.009 

8 10.5 0.3 0.013 

8 10.5 0.3 0.017 

9 10.5 0.15 0.010 

9 11.5 0.3 0.014 

9 11.5 0.3 0.018 

10 12 0.15 0.016 

11 13.5 0.3 0.018 

11 13.5 0.3 0.022 

11 14 0.3 0.017 

12 20 0.3 0.024 

12 20 0.3 0.030 

12 20 0.3 0.038 

14 22 0.3 0.026 

14 22 0.3 0.033 

14 22 0.3 0.042 

14 22 0.3 0.046 

17 25 0.3 0.039 

17 25 0.3 0.045 

17 26 0.3 0.036 

17 26 0.3 0.052 

17 26 0.3 0.064 

19 27 0.3 0.042 

19 27 0.3 0.053 

19 28 0.3 0.037 

19 28 0.3 0.056 

B-67


NTN 


Type NA49 

Type NA59 

Type NA69 

Type NKIR 

D 

r 

C 

r 

dF 

s 

Type NA49R 

Type NA59 

Type NA69R d30mm 

Type NKIR 

d 

1732mm 




grease oil 


17 30 23 0.3 22 1 18 200 27 200 1 850 2 770 12 000 18 000 NA6903R 

32 16 0.3 24 0.5 15 200 22 300 1 550 2 280 11 000 17 000 NK24/16RIR202416 

32 20 0.3 24 0.5 18 600 28 800 1 890 2 930 11 000 17 000 NK24/20RIR202420 

20 37 17 0.3 25 0.8 21 300 25 500 2 170 2 600 11 000 16 000 NA4904R 

37 23 0.3 25 0.8 28 400 37 000 2 900 3 750 11 000 16 000 NA5904 

37 30 0.3 25 1 36 500 50 500 3 700 5 150 11 000 16 000 NA6904R 

34 16 0.3 26 0.5 15 600 23 600 1 590 2 410 10 000 15 000 NK26/16RIR222616 

34 20 0.3 26 0.5 19 100 30 500 1 940 3 100 10 000 15 000 NK26/20RIR222620 

22 39 17 0.3 28 0.8 23 200 29 300 2 360 2 990 9 500 14 000 NA49/22R 

39 23 0.3 28 0.8 26 400 37 500 2 690 3 850 9 500 14 000 NA59/22 

39 30 0.3 28 0.5 40 000 58 500 4 050 6 000 9 500 14 000 NA69/22R 

38 20 0.3 29 1 22 200 34 000 2 270 3 450 9 500 14 000 NK29/20RIR252920 

38 30 0.3 29 1.5 27 500 50 500 2 810 5 150 9 500 14 000 NK29/30RIR252930 

25 42 17 0.3 30 0.8 24 000 31 500 2 450 3 200 8 500 13 000 NA4905R 

42 23 0.3 30 0.8 30 500 43 000 3 150 4 350 8 500 13 000 NA5905 

42 30 0.3 30 1 41 500 63 000 4 200 6 400 8 500 13 000 NA6905R 

42 20 0.3 32 1 23 500 37 500 2 400 3 850 8 500 13 000 NK32/20RIR283220 

42 30 0.3 32 1.5 34 000 60 500 3 450 6 150 8 500 13 000 NK32/30RIR283230 

28 45 17 0.3 32 0.8 24 800 33 500 2 530 3 400 8 500 13 000 NA49/28R 

45 23 0.3 32 0.8 32 000 45 500 3 250 4 650 8 500 13 000 NA59/28 

45 30 0.3 32 1 43 000 67 000 4 350 6 850 8 500 13 000 NA69/28R 

45 20 0.3 35 0.5 24 800 41 500 2 520 4 250 7 500 11 000 NK35/20RIR303520 

45 30 0.3 35 1 36 000 66 500 3 650 6 800 7 500 11 000 NK35/30RIR303530 

30 47 17 0.3 35 0.8 25 500 35 500 2 600 3 600 7 500 11 000 NA4906R 

47 23 0.3 35 0.8 32 500 48 500 3 350 4 950 7 500 11 000 NA5906 

47 30 0.3 35 1 42 500 67 500 4 300 6 900 7 500 11 000 NA6906R 

47 20 0.3 37 0.5 25 300 43 500 2 580 4 400 7 500 11 000 NK37/20RIR323720 

32 47 30 0.3 37 1 36 500 69 500 3 750 7 100 7 500 11 000 NK37/30RIR323730 

52 20 0.6 40 0.8 31 500 47 500 3 200 4 850 6 500 10 000 NA49/32R 



B-68


NTN 

ra 

ra 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


19 28 0.3 0.069 

22 30 0.3 0.049 

22 30 0.3 0.061 

22 35 0.3 0.074 

22 35 0.3 0.115 

22 35 0.3 0.141 

24 32 0.3 0.046 

24 32 0.3 0.064 

24 37 0.3 0.080 

24 37 0.3 0.134 

24 37 0.3 0.154 

27 36 0.3 0.079 

27 36 0.3 0.123 

27 40 0.3 0.088 

27 40 0.3 0.139 

27 40 0.3 0.162 

30 40 0.3 0.096 

30 40 0.3 0.146 

30 43 0.3 0.098 

30 43 0.3 0.142 

30 43 0.3 0.179 

32 43 0.3 0.112 

32 43 0.3 0.171 

32 45 0.3 0.101 

32 45 0.3 0.152 

32 45 0.3 0.185 

34 45 0.3 0.117 

34 45 0.3 0.170 

36 48 0.6 0.157 

B-69


NTN 


Type NA49 

Type NA59 

Type NA69 

Type NKIR 

D 

r 

C 

r 

d F 

D 

r 

C 

r 

d F 

Type NA49R 

Type NA59 

Type NKRIR 

Type NA69R 

d 

3255mm 




grease oil 


32 

52 27 0.6 40 0.8 38 000 61 000 3 850 6 250 6 500 10 000 NA59/32 

52 36 0.6 40 0.5 47 500 82 000 4 850 4 350 6 500 10 000 NA69/32R 

50 20 0.3 40 0.5 26 400 47 000 2 700 4 800 6 500 10 000 NK40/20RIR354020 

50 30 0.3 40 1 38 500 76 000 3 900 7 750 6 500 10 000 NK40/30RIR354030 

35 55 20 0.6 42 0.8 32 000 50 000 3 300 5 100 6 500 9 500 NA4907R 

55 27 0.6 42 0.8 39 000 64 500 3 950 6 550 6 500 9 500 NA5907 

55 36 0.6 42 0.5 49 000 86 500 5 000 8 800 6 500 9 500 NA6907R 

38 

53 20 0.3 43 0.5 27 500 51 000 2 810 5 200 6 500 9 500 NK43/20RIR384320 

53 30 0.3 43 1 40 000 82 000 4 100 8 400 6 500 9 500 NK43/30RIR384330 

55 20 0.3 45 0.5 28 000 52 500 2 860 5 400 6 000 9 000 NK45/20RIR404520 

55 30 0.3 45 1 41 000 85 500 4 150 8 700 6 000 9 000 NK45/30RIR404530 

40 62 22 0.6 48 1 43 500 66 500 4 450 6 800 5 500 8 500 NA4908R 

62 30 0.6 48 1 53 000 92 500 5 450 9 450 5 500 8 500 NA5908 

62 40 0.6 48 0.5 67 000 116 000 6 850 11 800 5 500 8 500 NA6908R 

42 

57 20 0.3 47 0.5 28 800 55 500 2 940 5 650 5 500 8 500 NK47/20RIR424720 

57 30 0.3 47 1 42 500 91 500 4 350 9 350 5 500 8 500 NK47/30RIR424730 

62 25 0.6 50 1.5 38 500 74 500 3 950 7 550 5 500 8 000 NK50/25RIR455025 

62 35 0.6 50 2 51 000 106 000 5 200 10 800 5 500 8 000 NK50/35RIR455035 

45 68 22 0.6 52 1 46 000 73 000 4 700 7 450 5 000 7 500 NA4909R 

68 30 0.6 52 1 56 000 101 000 5 700 10 300 5 000 7 500 NA5909 

68 40 0.6 52 0.5 70 500 127 000 7 200 13 000 5 000 7 500 NA6909R 

68 25 0.6 55 1.5 41 000 82 000 4 150 8 400 5 000 7 500 NK55/25RIR505525 

68 35 0.6 55 2 54 000 118 000 5 500 12 000 5 000 7 500 NK55/35RIR505535 

50 72 22 0.6 58 1 48 000 80 000 4 900 8 150 4 700 7 000 NA4910R 

72 30 0.6 58 1 58 000 110 000 5 950 11 200 4 700 7 000 NA5910 

72 40 0.6 58 0.5 74 000 139 000 7 500 14 200 4 700 7 000 NA6910R 

72 25 0.6 60 1.5 41 000 85 000 4 200 8 700 4 300 6 500 NK60/25RIR556025 

55 72 35 0.6 60 2 57 000 130 000 5 800 13 200 4 300 6 500 NK60/35RIR556035 

80 25 1 63 1.5 58 500 99 500 6 000 10 100 4 300 6 500 NA4911R 



B-70


NTN 

ra 

ra 

s 

ra 

ra 

Da 

da 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


36 48 0.6 0.241 

36 48 0.6 0.286 

37 48 0.3 0.130 

37 48 0.3 0.193 

39 51 0.6 0.171 

39 51 0.6 0.256 

39 51 0.6 0.310 

40 51 0.3 0.134 

40 51 0.3 0.207 

42 53 0.3 0.143 

42 53 0.3 0.216 

44 58 0.6 0.232 

44 58 0.6 0.348 

44 58 0.6 0.426 

44 55 0.3 0.148 

44 55 0.3 0.222 

48 58 0.6 0.229 

48 58 0.6 0.322 

49 64 0.6 0.270 

49 64 0.6 0.396 

49 64 0.6 0.437 

53 64 0.6 0.271 

53 64 0.6 0.379 

54 68 0.6 0.276 

54 68 0.6 0.498 

54 68 0.6 0.529 

58 68 0.6 0.271 

58 68 0.6 0.379 

60 75 1 0.396 

B-71


NTN 


Type NA49 

Type NA59 

Type NA69 

Type NKIR 

D 

r 

C 

r 

d F 

D 

r 

C 

r 

d F 

Type NA49R 

Type NA59 

Type NKRIR 

Type NA69R 

d 

5585mm 




grease oil 


55 

80 34 1 63 1.5 76 500 140 000 7 800 14 300 4 300 6 500 NA5911 

80 45 1 63 1.5 94 000 183 000 9 600 18 600 4 300 6 500 NA6911R 

82 25 1 68 1 44 500 89 000 4 500 9 050 4 000 6 000 NK68/25RIR606825 

82 35 0.6 68 1 63 000 139 000 6 400 14 200 4 000 6 000 NK68/35RIR606835 

60 85 25 1 68 1.5 61 500 108 000 6 250 11 000 4 000 6 000 NA4912R 

85 34 1 68 1.5 80 500 153 000 8 200 15 600 4 000 6 000 NA5912 

85 45 1 68 1.5 95 500 191 000 9 750 19 400 4 000 6 000 NA6912R 

90 25 0.6 73 1 54 000 100 000 5 500 10 200 3 700 5 500 NK73/25RIR657325 

90 25 1 72 1.5 62 500 112 000 6 350 11 400 3 700 5 500 NA4913R 

65 90 34 1 72 1.5 84 000 165 000 8 600 16 800 3 700 5 500 NA5913 

90 35 0.6 73 1 76 500 156 000 7 800 16 000 3 700 5 500 NK73/35RIR657335 

90 45 1 72 1.5 97 000 198 000 9 900 20 200 3 700 5 500 NA6913R 

95 25 1 80 0.8 57 000 119 000 5 800 12 200 3 300 5 000 NK80/25RIR708025 

95 35 1 80 0.8 79 500 184 000 8 150 18 700 3 300 5 000 NK80/35RIR708035 

70 100 30 1 80 1.5 85 500 156 000 8 750 15 900 3 300 5 000 NA4914R 

100 40 1 80 1.5 103 000 187 000 10 500 19 100 3 300 5 000 NA5914 

100 54 1 80 1 130 000 267 000 13 300 27 200 3 300 5 000 NA6914R 

105 25 1 85 1 70 500 123 000 7 200 12 600 3 100 4 700 NK85/25RIR758525 

105 30 1 85 1.5 87 000 162 000 8 900 16 500 3 100 4 700 NA4915R 

75 105 35 1 85 1 100 000 193 000 10 200 19 700 3 100 4 700 NK85/35RIR758535 

105 40 1 85 1.5 109 000 205 000 11 100 20 900 3 100 4 700 NA5915 

105 54 1 85 1 132 000 277 000 13 500 28 300 3 100 4 700 NA6915R 

110 25 1 90 1 71 500 128 000 7 300 13 100 2 900 4 400 NK90/25RIR809025 

110 30 1 90 1.5 90 500 174 000 9 250 17 700 2 900 4 400 NA4916R 

80 110 35 1 90 1 104 000 208 000 10 600 21 200 2 900 4 400 NK90/35RIR809035 

110 40 1 90 1.5 115 000 223 000 11 700 22 700 2 900 4 400 NA5916 

110 54 1 90 1.5 137 000 298 000 14 000 30 500 2 900 4 400 NA6916R 

85 

115 26 1 95 1.5 74 500 137 000 7 600 14 000 2 800 4 200 NK95/26RIR859526 

115 36 1 95 1.5 108 000 223 000 11 100 22 700 2 800 4 200 NK95/36RIR859536 



B-72


NTN 

ra 

ra 

s 

ra 

ra 

Da 

da 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


60 75 1 0.559 

60 75 1 0.726 

65 77 0.6 0.393 

64 78 0.6 0.551 

65 80 1 0.427 

65 80 1 0.614 

65 80 1 0.758 

69 86 0.6 0.466 

70 85 1 0.454 

70 85 1 0.655 

69 86 0.6 0.660 

70 85 1 0.779 

75 90 1 0.525 

75 90 1 0.738 

75 95 1 0.727 

75 95 1 1.06 

75 95 1 1.34 

80 100 1 0.642 

80 100 1 0.776 

80 100 1 0.853 

80 100 1 1.13 

80 100 1 1.45 

85 105 1 0.680 

85 105 1 0.820 

85 105 1 0.959 

85 105 1 1.15 

85 105 1 1.53 

90 110 1 0.644 

90 110 1 1.05 

B-73


NTN 


Type NA48 

Type NA49 

Type NA59 

Type NKIR 

D 

r 

C 

r 

d F 

D 

r 

C 

r 

d F 

Type NA49RType NA49 

Type NA59 

Type NKRIRType NKIR 

Type NA69R 

d 

85130mm 




grease oil 


120 35 1.1 100 1 112 000 237 000 11 500 24 200 2 700 4 000 NA4917R 

85 120 46 1.1 100 1.5 137 000 290 000 14 000 29 600 2 700 4 000 NA5917 

120 63 1.1 100 1 169 000 400 000 17 300 41 000 2 700 4 000 NA6917R 

120 26 1 100 1.5 73 500 137 000 7 500 14 000 2 700 4 000 NK100/26RIR9010026 

120 36 1 100 1.5 107 000 223 000 11 000 22 800 2 700 4 000 NK100/36RIR9010036 

90 125 35 1.1 105 1 116 000 252 000 11 900 25 700 2 500 3 800 NA4918R 

125 46 1.1 105 1 143 000 310 000 14 600 32 000 2 500 3 800 NA5918 

125 63 1.1 105 1 175 000 425 000 17 900 43 500 2 500 3 800 NA6918R 

125 26 1 105 1.5 76 500 147 000 7 800 14 900 2 500 3 800 NK105/26RIR9510526 

125 36 1 105 1.5 111 000 238 000 11 400 24 300 2 500 3 800 NK105/36RIR9510536 

95 130 35 1.1 110 1 118 000 260 000 12 000 26 500 2 400 3 600 NA4919R 

130 46 1.1 110 1 149 000 335 000 15 200 34 000 2 400 3 600 NA5919 

130 63 1.1 110 1 177 000 440 000 18 100 45 000 2 400 3 600 NA6919R 

100 

130 30 1.1 110 1.5 97 500 204 000 9 950 20 800 2 400 3 600 NK110/30RIR10011030 

130 40 1.1 110 2 129 000 292 000 13 100 29 700 2 400 3 600 NK110/40RIR10011040 

140 40 1.1 115 2 127 000 260 000 12 900 26 500 2 300 3 500 NA4920 

140 54 1.1 115 2 182 000 395 000 18 600 40 500 2 300 3 500 NA5920 

110 

120 

130 

140 30 1 120 0.8 93 500 210 000 9 550 21 400 2 200 3 300 NA4822 

140 40 1.1 120 113 000 268 000 11 500 27 300 2 200 3 300 NK120/40IR11012040 

150 40 1.1 125 2 131 000 279 000 13 300 28 400 2 100 3 200 NA4922 

150 54 1.1 125 2 193 000 440 000 19 700 45 000 2 100 3 200 NA5922 

150 30 1 130 0.8 99 500 233 000 10 100 23 800 2 100 3 100 NA4824 

150 40 1.1 130 116 000 283 000 11 800 28 800 2 100 3 100 NK130/40IR12013040 

165 45 1.1 135 2 180 000 380 000 18 300 38 500 2 000 3 000 NA4924 

165 60 1.1 135 2 245 000 525 000 25 000 53 500 2 000 3 000 NA5924 

165 35 1.1 145 1 118 000 305 000 12 100 31 000 1 900 2 800 NA4826 

170 32 1.5 145 111 000 238 000 11 300 24 300 1 900 2 800 NK145/32IR13014532 

170 42 1.5 145 153 000 360 000 15 600 36 500 1 900 2 800 NK145/42IR13014542 

180 50 1.5 150 1.5 202 000 455 000 20 600 46 500 1 800 2 700 NA4926 



B-74


NTN 

ra 

ra 

s 

ra 

ra 

Da 

da 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


91.5 113.5 1 1.24 

91.5 113.5 1 1.76 

91.5 113.5 1 2.25 

95 115 1 0.781 

95 115 1 1.09 

96.5 118.5 1 1.31 

96.5 118.5 1 1.84 

96.5 118.5 1 2.44 

100 120 1 0.819 

100 120 1 1.15 

101.5 123.5 1 1.36 

101.5 123.5 1 1.98 

101.5 123.5 1 2.63 

106.5 123.5 1 0.990 

106.5 123.5 1 1.34 

106.5 133.5 1 1.93 

106.5 133.5 1 2.85 

115 135 1 1.11 

116.5 133.5 1 1.49 

116.5 143.5 1 2.08 

116.5 143.5 1 2.98 

125 145 1 1.17 

126.5 143.5 1 1.57 

126.5 158.5 1 2.84 

126.5 158.5 1 3.92 

136.5 158.5 1 1.60 

138 162.5 1.5 1.90 

138 162.5 1.5 2.54 

138 172 1.5 3.90 

B-75


NTN 


Type NA48 

Type NA49 

Type NA59 

Type NKIR 

r 

C 

r 

s 

D 

dF 

d 

130280mm 




grease oil 


130 180 67 1.5 150 1.5 294 000 685 000 30 000 70 000 1 800 2 700 NA5926 

175 35 1.1 155 1 121 000 315 000 12 300 32 500 1 700 2 600 NA4828 

180 32 1.5 155 114 000 252 000 11 600 25 700 1 700 2 600 NK155/32IR14015532 

140 180 42 1.5 155 156 000 380 000 16 000 38 500 1 700 2 600 NK155/42IR14015542 

190 50 1.5 160 1.5 209 000 485 000 21 300 49 500 1 700 2 500 NA4928 

190 67 1.5 160 1.5 310 000 755 000 31 500 77 000 1 700 2 500 NA5928 

150 

190 32 1.5 165 117 000 265 000 11 900 27 000 1 600 2 400 NK165/32IR15016532 

190 40 1.1 165 1.5 152 000 390 000 15 500 40 000 1 600 2 400 NA4830 

190 42 1.5 165 160 000 400 000 16 300 40 500 1 600 2 400 NK165/42IR15016542 

210 60 2 170 1.5 261 000 610 000 26 600 62 500 1 600 2 400 NA4930 

160 

170 

180 

190 

200 

220 

240 

260 

280 

200 40 1.1 175 1.5 160 000 425 000 16 300 43 500 1 500 2 300 NA4832 

220 60 2 180 1.5 270 000 650 000 27 600 66 500 1 500 2 200 NA4932 

215 45 1.1 185 1.5 185 000 495 000 18 800 50 500 1 500 2 200 NA4834 

230 60 2 190 1.5 279 000 690 000 28 500 70 500 1 400 2 100 NA4934 

225 45 1.1 195 1.5 195 000 540 000 19 800 55 000 1 400 2 100 NA4836 

250 69 2 205 1.5 375 000 890 000 38 500 90 500 1 300 2 000 NA4936 

240 50 1.5 210 1.5 227 000 680 000 23 200 69 000 1 300 1 900 NA4838 

260 69 2 215 1.5 390 000 945 000 40 000 96 500 1 300 1 900 NA4938 

250 50 1.5 220 1.5 231 000 705 000 23 600 71 500 1 200 1 800 NA4840 

280 80 2.1 225 1.5 505 000 1 180 000 51 500 120 000 1 200 1 800 NA4940 

270 50 1.5 240 1.5 244 000 780 000 24 900 79 500 1 100 1 700 NA4844 

300 80 2.1 245 1.5 525 000 1 270 000 53 500 129 000 1 100 1 600 NA4944 

300 60 2 265 2 360 000 1 080 000 37 000 110 000 1 000 1 500 NA4848 

320 80 2.1 265 2 540 000 1 350 000 55 000 138 000 1 000 1 500 NA4948 

320 60 2 285 2 375 000 1 160 000 38 000 119 000 950 1 400 NA4852 

360 100 2.1 290 2 805 000 1 900 000 82 000 193 000 950 1 400 NA4952 

350 69 2 305 2.5 455 000 1 300 000 46 500 133 000 850 1 300 NA4856 

380 100 2.1 310 2.5 835 000 2 030 000 85 000 207 000 850 1 300 NA4956 



B-76


NTN 

ra 

ra 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


138 172 1.5 5.60 

146.5 168.5 1 1.82 

148 172 1.5 2.04 

148 172 1.5 2.69 

148 182 1.5 4.05 

148 182 1.5 6.18 

158 182 1.5 2.32 

156.5 183.5 1 2.72 

158 182 1.5 2.84 

159 201 2 5.33 

166.5 193.5 1 2.90 

169 211 2 5.60 

176.5 208.5 1 3.99 

179 221 2 5.87 

186.5 218.5 1 4.19 

189 241 2 8.58 

198 232 1.5 5.62 

199 251 2 8.68 

208 242 1.5 5.84 

211 269 2 12.2 

228 262 1.5 6.37 

231 289 2 13.5 

249 291 2 10.0 

251 309 2 14.7 

269 311 2 10.8 

271 349 2 25.9 

289 341 2 15.5 

291 369 2 27.5 

B-77


NTN 


Type NA48 

Type NA49 

r 

C 

r 

s 

D 

dF 

d 

300440mm 




grease oil 

d D C rs min 1 F s 2 Cr Cor Cr Cor 

300 

320 

340 

360 

380 

380 80 2.1 330 2 625 000 1 770 000 64 000 180 000 800 1 200 NA4860 

420 118 3 340 2 1 080 000 2 640 000 110 000 269 000 800 1 200 NA4960 

400 80 2.1 350 2 640 000 1 850 000 65 500 189 000 750 1 100 NA4864 

440 118 3 360 2 1 120 000 2 820 000 114 000 288 000 750 1 100 NA4964 

420 80 2.1 370 2 655 000 1 940 000 66 500 197 000 750 1 100 NA4868 

460 118 3 380 2 1 160 000 3 000 000 118 000 305 000 750 1 100 NA4968 

440 80 2.1 390 2 665 000 2 020 000 68 000 206 000 650 1 000 NA4872 

480 118 3 400 2 1 200 000 3 200 000 122 000 325 000 650 1 000 NA4972 

480 100 2.1 415 2 1 000 000 2 840 000 102 000 289 000 650 950 NA4876 

520 140 4 430 2 1 400 000 3 750 000 143 000 385 000 650 950 NA4976 

400 540 140 4 450 2.5 1 450 000 4 000 000 148 000 410 000 600 900 NA4980 

420 560 140 4 470 2.5 1 500 000 4 250 000 153 000 430 000 550 850 NA4984 

440 600 160 4 490 2.5 1 750 000 4 600 000 179 000 470 000 550 800 NA4988 

Note 1) Allowable minimum chamfer dimension r . 

2) Allowable axial stroking value of inner ring against outer ring. 

B-78


NTN 

ra 

ra 

Da 

da 

Abutment Mass 

dimensions 

mm 

kg 

da Da ras 


311 369 2 22.0 

313 407 2.5 42.5 

331 389 2 23.2 

333 427 2.5 45.2 

351 409 2 24.1 

353 447 2.5 47.3 

371 429 2 25.7 

373 467 2.5 49.0 

391 469 2 44.5 

396 504 3 73.6 

416 524 3 76.6 

436 544 3 89.8 

456 584 3 123 

B-79


NTN 

Inch series 

Without inner ring 

Type MR 

FW 

15.87563.500mm 

Boundary dimensions Basic load ratings Limiting speeds 


mm (!/25.4mm) N kgf r/min 

grease oil 

Fw D C rs min 1) Cr Cor Cr Cor (approx.) 

15.875(%/8) 

19.050(#/4) 

22.225(&/8) 

25.400(1) 

28.575(1 !/8) 

31.750(1 !/4) 

34.925(1 #/8) 

38.100(1 !/2) 

41.275(1 %/8) 

+0.027 

+0.016 

+0.033 

+0.020 

+0.033 

+0.020 

+0.033 

+0.020 

+0.033 

+0.020 

+0.041 

+0.025 

+0.041 

+0.025 

+0.041 

+0.025 

+0.041 

+0.025 

28.575(1 !/8) 19.05(#/4) 0.6 16 700 16 700 1 700 1 700 17 000 25 000 

28.575(1 !/8) 25.40(1) 0.6 21 500 23 000 2 190 2 350 17 000 25 000 

31.750(1 !/4) 19.05(#/4) 1 19 500 21 100 1 980 2 150 14 000 21 000 

31.750(1 !/4) 25.40(1) 1 25 000 29 100 2 550 2 970 14 000 21 000 

34.925(1 #/8) 19.05(#/4) 1 21 900 25 600 2 240 2 610 12 000 18 000 

34.925(1 #/8) 25.40(1) 1 28 200 35 500 2 870 3 600 12 000 18 000 

38.100(1 !/2) 19.05(#/4) 1 23 000 28 100 2 340 2 870 11 000 16 000 

38.100(1 !/2) 25.40(1) 1 29 500 38 500 3 000 3 950 11 000 16 000 

41.275(1 %/8) 25.40(1) 1 32 500 45 000 3 300 4 600 9 500 14 000 

41.275(1 %/8) 31.75(1 !/4) 1 40 500 60 000 4 100 6 100 9 500 14 000 

44.450(1 #/4) 25.40(1) 1 35 000 51 000 3 550 5 200 8 500 13 000 

44.450(1 #/4) 31.75(1 !/4) 1 43 500 68 000 4 450 6 950 8 500 13 000 

47.625(1 &/8) 25.40(1) 1 37 000 57 500 3 800 5 850 7 500 11 000 

47.625(1 &/8) 31.75(1 !/4) 1 46 500 76 500 4 750 7 800 7 500 11 000 

52.388(2 !/16) 25.40(1) 1.5 41 000 61 000 4 150 6 250 7 500 11 000 

52.388(2 !/16) 31.75(1 !/4) 1.5 51 000 81 500 5 200 8 300 7 500 11 000 

55.562(2 #/16) 25.40(1) 1.5 43 500 68 000 4 450 6 950 6 500 9 500 

55.562(2 #/16) 31.75(1 !/4) 1.5 54 500 90 500 5 550 9 250 6 500 9 500 

44.450(1 #/4) 

58.738(2 %/16) 25.40(1) 1.5 44 500 72 000 4 550 7 350 6 000 9 000 

58.738(2 %/16) 31.75(1 !/4) 1.5 55 500 95 500 5 700 9 750 6 000 9 000 

+0.041 

47.625(1 &/8) +0.025 61.912(2 &/16) 31.75(1 !/4) 1.5 59 000 105 000 6 000 10 700 5 500 8 500 

50.800(2) 

57.150(2 !/4) 

+0.041 

+0.025 

+0.049 

+0.030 

+0.049 

+0.030 

65.088(2 (/16) 25.40(1) 1.5 49 500 86 000 5 050 8 800 5 500 8 000 

65.088(2 (/16) 31.75(1 !/4) 1.5 62 000 114 000 6 300 11 700 5 500 8 000 

76.200(3) 38.10(1 !/2) 1.5 83 500 142 000 8 500 14 500 4 700 7 000 

76.200(3) 44.45(1 #/4) 1.5 97 000 173 000 9 850 17 600 4 700 7 000 

+0.049 

63.500(2 !/2) +0.030 82.550(3 !/4) 38.10(1 !/2) 2 88 000 158 000 8 950 16 100 4 300 6 500 


B-80


NTN 

Bearing Abutment Mass 

numbers dimensions 

mm 

kg 

Da 

ras 

max max (approx.) 

MR101812 24.5 0.6 0.050 

MR101816 24.5 0.6 0.068 

MR122012 26.5 1 0.055 

MR122016 26.5 1 0.073 

MR142212 30 1 0.059 

MR142216 30 1 0.082 

MR162412 33 1 0.068 

MR162416 33 1 0.091 

MR182616 36.5 1 0.100 

MR182620 36.5 1 0.127 

MR202816 39.5 1 0.109 

MR202820 39.5 1 0.136 

MR223016 42.5 1 0.118 

MR223020 42.5 1 0.150 

MR243316 46 1.5 0.143 

MR243320 46 1.5 0.180 

MR263516 49 1.5 0.153 

MR263520 49 1.5 0.191 

MR283716 52 1.5 0.163 

MR283720 52 1.5 0.204 

MR303920 55.5 1.5 0.216 

MR324116 58.5 1.5 0.183 

MR324120 58.5 1.5 0.227 

MR364824 69.5 1.5 0.422 

MR364828 69.5 1.5 0.493 

MR405224 74.5 2 0.472 

B-81


NTN 

Inch series 


Type MR 

FW 

63.500184.150mm 




grease oil 


+0.049 

63.500(2 !/2) 

+0.030 82.550(3 !/4) 44.45(1 #/4) 2 102 000 191 000 10 400 19 500 4 300 6 500 

88.900(3 !/2) 25.40(1) 2 66 000 112 000 6 700 11 400 3 700 5 500 

69.850(2 #/4) 

+0.049 

+0.030 88.900(3 !/2) 38.10(1 !/2) 2 92 000 173 000 9 400 17 600 3 700 5 500 

88.900(3 !/2) 44.45(1 #/4) 2 107 000 209 000 10 900 21 300 3 700 5 500 

76.200(3) 

+0.049 

+0.030 

95.250(3 #/4) 38.10(1 !/2) 2 96 000 188 000 9 800 19 100 3 300 5 000 

95.250(3 #/4) 44.45(1 #/4) 2 112 000 227 000 11 400 23 200 3 300 5 000 

82.550(3 !/4) 

+0.058 

+0.036 

107.950(4 !/4) 44.45(1 #/4) 2 134 000 240 000 13 600 24 500 3 300 5 000 

107.950(4 !/4) 50.80(2) 2 146 000 268 000 14 900 27 400 3 300 5 000 

88.900(3 !/2) 

114.300(4 !/2) 44.45(1 #/4) 2 141 000 264 000 14 400 26 900 3 000 4 500 

114.300(4 !/2) 50.80(2) 2 154 000 295 000 15 700 30 000 3 000 4 500 

95.250(3 #/4) 

+0.058 

+0.036 120.650(4 #/4) 50.80(2) 2.5 162 000 320 000 16 500 32 500 2 800 4 200 

101.600(4) 

+0.058 

+0.036 127.000(5) 50.80(2) 2.5 169 000 345 000 17 200 35 500 2 600 3 900 

107.950(4 !/4) 

+0.058 

+0.036 133.350(5 !/4) 50.80(2) 2.5 172 000 360 000 17 500 37 000 2 500 3 700 

114.300(4 !/2) 

152.400(6) 57.15(2 !/4) 2.5 238 000 435 000 24 300 44 500 2 300 3 500 

152.400(6) 63.50(2 !/2) 2.5 260 000 485 000 26 500 49 500 2 300 3 500 

165.100(6 !/2) 50.80(2) 2.5 227 000 425 000 23 200 43 000 2 100 3 100 

127.000(5) 

+0.068 

+0.043 165.100(6 !/2) 57.15(2 !/4) 2.5 250 000 480 000 25 500 49 000 2 100 3 100 

165.100(6 !/2) 63.50(2 !/2) 2.5 273 000 535 000 27 800 54 500 2 100 3 100 

139.700(5 !/2) 

177.800(7) 63.50(2 !/2) 2.5 285 000 585 000 29 100 59 500 1 900 2 900 

177.800(7) 76.20(3) 2.5 345 000 740 000 35 000 75 500 1 900 2 900 

+0.068 

146.050(5 #/4) +0.043 184.150(7 !/4) 76.20(3) 3 360 000 775 000 36 500 79 000 1 800 2 700 

152.400(6) 

165.100(6 !/2) 

+0.058 

+0.036 

+0.058 

+0.036 

+0.068 

+0.043 

+0.068 

+0.043 

+0.068 

+0.043 

190.500(7 !/2) 63.50(2 !/2) 3 310 000 630 000 31 500 64 000 1 700 2 600 

190.500(7 !/2) 76.20(3) 3 375 000 800 000 38 000 81 500 1 700 2 600 

203.200(8) 63.50(2 !/2) 3 325 000 680 000 33 000 69 500 1 600 2 400 

203.200(8) 76.20(3) 3 390 000 870 000 39 500 88 500 1 600 2 400 

+0.079 

184.150(7 !/4) +0.050 231.775(9 !/8) 76.20(3) 3 435 000 915 000 44 500 93 000 1 500 2 200 


B-82


NTN 



mm 

kg 

Da 

ras 


MR405228 74.5 2 0.533 

MR445616 81 2 0.343 

MR445624 81 2 0.504 

MR445628 81 2 0.580 

MR486024 87 2 0.558 

MR486028 87 2 0.651 

MR526828 100 2 1.02 

MR526832 100 2 1.17 

MR567228 106.5 2 1.08 

MR567232 106.5 2 1.27 

MR607632 111.5 2.5 1.28 

MR648032 118 2.5 1.29 

MR688432 124.5 2.5 1.36 

MR729636 143.5 2.5 2.62 

MR729640 143.5 2.5 2.91 

MR8010432 156 2.5 2.53 

MR8010436 156 2.5 2.87 

MR8010440 156 2.5 3.19 

MR8811240 169 2.5 3.46 

MR8811248 169 2.5 4.16 

MR9211648 172 3 4.30 

MR9612040 177.5 3 3.74 

MR9612048 177.5 3 4.49 

MR10412840 190 3 4.02 

MR10412848 190 3 4.82 

MR11614648 219 3 7.36 

B-83


NTN 

Inch series 


Type MR 

FW 

196.850234.950mm 




grease oil 


196.850(7 #/4) 

+0.079 

+0.050 244.475(9 %/8) 76.20(3) 3 455 000 990 000 46 500 101 000 1 300 2 000 

209.550(8 !/4) 

+0.079 

+0.050 257.175(10 !/8) 76.20(3) 3 475 000 1 060 000 48 500 109 000 1 300 1 900 

222.250(8 #/4) 

+0.079 

+0.050 269.875(10 %/8) 76.20(3) 4 495 000 1 140 000 50 500 116 000 1 200 1 800 

234.950(9 !/4) 

+0.079 

+0.050 282.575(11 !/8) 76.20(3) 4 510 000 1 210 000 52 000 124 000 1 100 1 700 


B-84


NTN 



mm 

kg 

Da 

ras 


MR12415448 231.5 3 7.80 

MR13216248 244 3 8.36 

MR14017048 254 4 8.81 

MR14817848 266.5 4 9.27 

B-85


NTN 

Inch series 


Type MRMI 

d 

9.52534.925mm 

Boundary dimensions 

Basic load ratings 


mm (!/25.4mm) N kgf 

d D B C rs min 1) F s 2) Cr Cor Cr Cor 

9.525(#/8) 

12.700(!/2) 

15.875(%/8) 

28.575(1 !/8) 19.30 19.05(#/4) 0.6 15.875 2 16 700 16 700 1 700 1 700 

28.575(1 !/8) 25.65 25.40(1) 0.6 15.875 3 21 500 23 000 2 190 2 350 

31.750(1 !/4) 19.30 19.05(#/4) 1 19.050 4 19 500 21 100 1 980 2 150 

31.750(1 !/4) 25.65 25.40(1) 1 19.050 2 25 000 29 100 2 550 2 970 

34.925(1 #/8) 19.30 19.05(#/4) 1 22.225 1 21 900 25 600 2 240 2 610 

34.925(1 #/8) 25.65 25.40(1) 1 22.225 2 28 200 35 500 2 870 3 600 

17.462(!!/16) 34.925(1 #/8) 19.30 19.05(#/4) 1 22.225 1.5 21 900 25 600 2 240 2 610 

19.050(#/4) 

38.100(1 !/2) 19.30 19.05(#/4) 1 25.400 1 23 000 28 100 2 340 2 870 

38.100(1 !/2) 25.65 25.40(1) 1 25.400 1.5 29 500 38 500 3 000 3 950 

20.638(!#/16) 38.100(1 !/2) 25.65 25.40(1) 1 25.400 2 29 500 38 500 3 000 3 950 

22.225(&/8) 

23.812(!%/16) 

25.400(1) 

28.575(1 !/8) 

41.275(1 %/8) 25.65 25.40(1) 1 28.575 1.5 32 500 45 000 3 300 4 600 

41.275(1 %/8) 32.00 31.75(1 !/4) 1 28.575 2 40 500 60 000 4 100 6 100 

41.275(1 %/8) 25.65 25.40(1) 1 28.575 2 32 500 45 000 3 300 4 600 

41.275(1 %/8) 32.00 31.75(1 !/4) 1 28.575 2 40 500 60 000 4 100 6 100 

44.450(1 #/4) 25.65 25.40(1) 1 31.750 1.5 35 000 51 000 3 550 5 200 

44.450(1 #/4) 32.00 31.75(1 !/4) 1 31.750 2 43 500 68 000 4 450 6 950 

47.625(1 &/8) 25.65 25.40(1) 1 34.925 3 37 000 57 500 3 800 5 850 

47.625(1 &/8) 32.00 31.75(1 !/4) 1 34.925 2 46 500 76 500 4 750 7 800 

30.162(1 #/16) 52.388(2 !/16) 32.00 31.75(1 !/4) 1 38.100 2 51 000 81 500 5 200 8 300 

31.750(1 !/4) 

33.338(1 %/16) 

52.388(2 !/16) 25.65 25.40(1) 1.5 38.100 0.5 41 000 61 000 4 150 6 250 

52.388(2 !/16) 32.00 31.75(1 !/4) 1.5 38.100 1 51 000 81 500 5 200 8 300 

55.562(2 #/16) 25.65 25.40(1) 1.5 41.275 0.5 43 500 68 000 4 450 6 950 

55.562(2 #/16) 32.00 31.75(1 !/4) 1.5 41.275 1 54 500 90 500 5 550 9 250 

55.562(2 #/16) 32.00 31.75(1 !/4) 1.5 41.275 0.5 54 500 90 500 5 550 9 250 

34.925(1 #/8) 58.738(2 %/16) 25.65 25.40(1) 1.5 44.450 0.5 44 500 72 000 4 550 7 350 

58.738(2 %/16) 32.00 31.75(1 !/4) 1.5 44.450 1 55 500 95 500 5 700 9 750 



B-86


NTN 

Limiting speeds Bearing numbers Abutment dimensions Mass 

r/min mm kg 

grease oil da Da ras 


17 000 25 000 MR101812MI-061012 13.5 24.5 0.6 0.069 

17 000 25 000 MR101816MI-061016 13.5 24.5 0.6 0.093 

14 000 21 000 MR122012MI-081212 17.5 26.5 1 0.079 

14 000 21 000 MR122016MI-081216 17.5 26.5 1 0.105 

12 000 18 000 MR142212MI-101412 21 30 1 0.086 

12 000 18 000 MR142216MI-101416 21 30 1 0.118 

12 000 18 000 MR142212MI-111412 21 30 1 0.079 

11 000 16 000 MR162412MI-121612 24 33 1 0.102 

11 000 16 000 MR162416MI-121616 24 33 1 0.136 

11 000 16 000 MR162416MI-131616 24 33 1 0.125 

9 500 14 000 MR182616MI-141816 27 36.5 1 0.152 

9 500 14 000 MR182620MI-141820 27 36.5 1 0.193 

9 500 14 000 MR182616MI-151816 27 36.5 1 0.139 

9 500 14 000 MR182620MI-151820 27 36.5 1 0.176 

8 500 13 000 MR202816MI-162016 30.5 39.5 1 0.161 

8 500 13 000 MR202820MI-162020 30.5 39.5 1 0.201 

7 500 11 000 MR223016MI-182216 33.5 42.5 1 0.181 

7 500 11 000 MR223020MI-182220 33.5 42.5 1 0.229 

7 500 11 000 MR243320MI-192420 35 46 1.5 0.286 

7 500 11 000 MR243316MI-202416 37 46 1.5 0.230 

7 500 11 000 MR243320MI-202420 37 46 1.5 0.285 

6 500 9 500 MR263516MI-212616 40 49 1.5 0.257 

6 500 9 500 MR263520MI-212620 40 49 1.5 0.325 

6 500 9 500 MR263520MI-222620 40 49 1.5 0.286 

6 000 9 000 MR283716MI-222816 41.5 52 1.5 0.294 

6 000 9 000 MR283720MI-222820 41.5 52 1.5 0.364 

B-87


NTN 

Inch series 


Type MRMI 

d 

 






36.512(1 &/16) 

58.738(2 %/16) 25.65 25.40(1) 1.5 44.450 0.5 44 500 72 000 4 550 7 350 

58.738(2 %/16) 32.00 31.75(1 !/4) 1.5 44.450 0.5 55 500 95 500 5 700 9 750 

58.738(2 %/16) 25.65 25.40(1) 1.5 44.450 0.5 44 500 72 000 4 550 7 350 

38.100(1 !/2) 58.738(2 %/16) 32.00 31.75(1 !/4) 1.5 44.450 0.5 55 500 95 500 5 700 9 750 

65.088(2 (/16) 32.00 31.75(1 !/4) 1.5 50.800 0.5 62 000 114 000 6 300 11 700 

39.688(1 (/16) 

41.275(1 %/8) 

42.682(1 !!/16) 

44.450(1 #/4) 

49.212(1 !%/16) 

50.800(2) 

61.912(2 &/16) 32.00 31.75(1 !/4) 1.5 47.625 1 59 000 105 000 6 000 10 700 

65.088(2 (/16) 32.00 31.75(1 !/4) 1.5 50.800 0.5 62 000 114 000 6 300 11 700 

65.088(2 (/16) 25.65 25.40(1) 1.5 50.800 0.5 49 500 86 000 5 050 8 800 

65.088(2 (/16) 32.00 31.75(1 !/4) 1.5 50.800 1 62 000 114 000 6 300 11 700 

65.088(2 (/16) 25.65 25.40(1) 1.5 50.800 0.5 49 500 86 000 5 050 8 800 

65.088(2 (/16) 32.00 31.75(1 !/4) 1.5 50.800 0.5 62 000 114 000 6 300 11 700 

76.200(3) 38.35 38.10(1 !/2) 1.5 57.150 3.5 83 500 142 000 8 500 14 500 

76.200(3) 44.70 44.45(1 #/4) 1.5 57.150 3.5 97 000 173 000 9 850 17 600 

82.550(3 !/4) 38.35 38.10(1 !/2) 2 63.500 1.5 88 000 158 000 8 950 16 100 

82.550(3 !/4) 44.70 44.45(1 #/4) 2 63.500 2 102 000 191 000 10 400 19 500 

82.550(3 !/4) 38.35 25.40(1) 2 63.500 2.5 88 000 158 000 8 950 16 100 

82.550(3 !/4) 44.70 44.45(1 #/4) 2 63.500 3 102 000 191 000 10 400 19 500 

55.562(2 #/16) 88.900(3 !/2) 44.70 44.45(1 #/4) 2 69.850 1.5 107 000 209 000 10 900 21 300 

88.900(3 !/2) 25.65 25.40(1) 2 69.850 0.5 66 000 112 000 6 700 11 400 

57.150(2 !/4) 88.900(3 !/2) 38.35 38.10(1 !/2) 2 69.850 2.5 92 000 173 000 9 400 17 600 

88.900(3 !/2) 44.70 44.45(1 #/4) 2 69.850 3 107 000 209 000 10 900 21 300 

60.325(2 #/8) 95.250(3 #/4) 44.70 44.45(1 #/4) 2 76.200 1.5 112 000 227 000 11 400 23 200 

63.500(!/2) 

66.675(2 %/8) 

95.250(3 #/4) 38.35 38.10(1 !/2) 2 76.200 2.5 96 000 188 000 9 800 19 100 

95.250(3 #/4) 44.70 44.45(1 #/4) 2 76.200 3 112 000 227 000 11 400 23 200 

107.950(4 !/4) 44.70 44.45(1 #/4) 2 82.550 3 134 000 240 000 13 600 24 500 

107.950(4 !/4) 51.05 50.80(2) 2 82.550 5.5 146 000 268 000 14 900 27 400 



B-88


NTN 


r/min mm kg 



6 000 9 000 MR283716MI-232816 43 52 1.5 0.264 

6 000 9 000 MR283720MI-232820 43 52 1.5 0.330 

6 000 9 000 MR283716MI-242816 43 52 1.5 0.246 

6 000 9 000 MR283720MI-242820 43 52 1.5 0.307 

5 500 8 000 MR324120MI-243220 44.5 58.5 1.5 0.448 

5 500 8 500 MR303920MI-253020 46.5 55.5 1.5 0.368 

5 500 8 000 MR324120MI-253220 46 58.5 1.5 0.424 

5 500 8 000 MR324116MI-263216 48 58.5 1.5 0.317 

5 500 8 000 MR324120MI-263220 48 58.5 1.5 0.402 

5 500 8 000 MR324116MI-273216 49.5 58.5 1.5 0.300 

5 500 8 000 MR324120MI-273220 49.5 58.5 1.5 0.373 

4 700 7 000 MR364824MI-283624 51 69.5 1.5 0.732 

4 700 7 000 MR364828MI-283628 51 69.5 1.5 0.853 

4 300 6 500 MR405224MI-314024 56 74.5 2 0.848 

4 300 6 500 MR405228MI-314028 56 74.5 2 0.975 

4 300 6 500 MR405224MI-324024 59 74.5 2 0.812 

4 300 6 500 MR405228MI-324028 59 74.5 2 0.923 

3 700 5 500 MR445628MI-354428 63.5 81 2 1.07 

3 700 5 500 MR445616MI-364416 65 81 2 0.594 

3 700 5 500 MR445624MI-364424 65 81 2 0.884 

3 700 5 500 MR445628MI-364428 65 81 2 1.02 

3 300 5 000 MR486028MI-384828 68 87 2 1.25 

3 300 5 000 MR486024MI-404824 71.5 87 2 0.978 

3 300 5 000 MR486028MI-404828 71.5 87 2 1.14 

3 300 5 000 MR526828MI-425228 74.5 100 2 1.67 

3 300 5 000 MR526832MI-425232 74.5 100 2 1.92 

B-89


NTN 

Inch series 


Type MRMI 

d 

69.850127.000mm 






69.850(2 #/4) 

107.950(4 !/4) 44.70 44.45(1 #/4) 2 82.550 1.5 134 000 240 000 13 600 24 500 

107.950(4 !/4) 51.05 50.80(2) 2 82.550 3 146 000 268 000 14 900 27 400 

74.612(2 !%/16) 114.300(4 !/2) 51.05 50.80(2) 2 88.900 3 154 000 295 000 15 700 30 000 

76.200(3) 

114.300(4 !/2) 44.70 44.45(1 #/4) 2 88.900 3 141 000 264 000 14 400 26 900 

114.300(4 !/2) 51.05 50.80(2) 2 88.900 5.5 154 000 295 000 15 700 30 000 

79.375(3 !/8) 120.650(4 #/4) 51.05 50.80(2) 2.5 95.250 5.5 162 000 320 000 16 500 32 500 

82.550(3 !/4) 

120.650(4 #/4) 51.05 50.80(2) 2.5 95.250 2.5 162 000 320 000 16 500 32 500 

127.000(5) 51.05 50.80(2) 2.5 101.600 2.5 169 000 345 000 17 200 35 500 

85.725(3 #/8) 127.000(5) 51.05 50.80(2) 2.5 101.600 4.5 169 000 345 000 17 200 35 500 

88.900(3 !/2) 

127.000(5) 51.05 50.80(2) 2.5 101.600 2.5 169 000 345 000 17 200 35 500 

133.350(5 !/4) 51.05 50.80(2) 2.5 107.950 2.5 172 000 360 000 17 500 37 000 

92.075(3 %/8) 133.350(5 !/4) 51.05 50.80(2) 2.5 107.950 4.5 172 000 360 000 17 500 37 000 

133.350(5 !/4) 51.05 50.80(2) 2.5 107.950 2.5 172 000 360 000 17 500 37 000 

95.250(3 #/4) 152.400(6) 57.40 57.15(2 !/4) 2.5 114.300 3 238 000 435 000 24 300 44 500 

152.400(6) 63.88 63.50(2 !/2) 2.5 114.300 4 260 000 485 000 26 500 49 500 

98.425(3 &/8) 

152.400(6) 57.40 57.15(2 !/4) 2.5 114.300 5.5 238 000 435 000 24 300 44 500 

152.400(6) 63.88 63.50(2 !/2) 2.5 114.300 7 260 000 485 000 26 500 49 500 

165.100(6 !/2) 51.05 50.80(2) 2.5 127.000 2.5 227 000 425 000 23 200 43 000 

101.600(4) 165.100(6 !/2) 57.40 57.15(2 !/4) 2.5 127.000 5.5 250 000 480 000 25 500 49 000 

165.100(6 !/2) 63.88 57.15(2 !/4) 2.5 127.000 7 273 000 535 000 27 800 54 500 

107.950(4 !/4) 165.100(6 !/2) 57.40 57.15(2 !/4) 2.5 127.000 3 250 000 480 000 25 500 49 000 

114.300(4 !/2) 

177.800(7) 63.88 63.50(2 !/2) 2.5 139.700 5.5 285 000 585 000 29 100 59 500 

177.800(7) 76.58 76.20(3) 2.5 139.700 7 345 000 740 000 35 000 75 500 

120.650(4 #/4) 184.150(7 !/4) 82.55 76.20(3) 3 146.050 3 360 000 775 000 36 500 79 000 

127.000(5) 

190.500(7 !/2) 63.88 63.50(2 !/2) 3 152.400 7 310 000 630 000 31 500 64 000 

190.500(7 !/2) 76.58 76.20(3) 3 152.400 5.5 375 000 800 000 38 000 81 500 



B-90


NTN 


r/min mm kg 



3 300 5 000 MR526828 MI-445228 78 100 2 1.55 

3 300 5 000 MR526832 MI-445232 78 100 2 1.77 

3 000 4 500 MR567232 MI-475632 83 106.5 2 2.00 

3 000 4 500 MR567228 MI-485628 84 106.5 2 1.65 

3 000 4 500 MR567232 MI-485632 84 106.5 2 1.92 

2 800 4 200 MR607632 MI-506032 88.5 111.5 2.5 2.15 

2 800 4 200 MR607632 MI-526032 91.5 111.5 2.5 1.99 

2 600 3 900 MR648032 MI-526432 91.5 118 2.5 2.39 

2 600 3 900 MR648032 MI-546432 94.5 118 2.5 2.22 

2 600 3 900 MR648032 MI-566432 98 118 2.5 2.05 

2 500 3 700 MR688432 MI-566832 98 124.5 2.5 2.53 

2 500 3 700 MR688432 MI-586832 101 124.5 2.5 2.36 

2 500 3 700 MR688432 MI-606832 104.5 124.5 2.5 2.17 

2 300 3 500 MR729636 MI-607236 104.5 143.5 2.5 4.02 

2 300 3 500 MR729640 MI-607240 104.5 143.5 2.5 4.47 

2 300 3 500 MR729636 MI-627236 107.5 143.5 2.5 3.77 

2 300 3 500 MR729640 MI-627240 107.5 143.5 2.5 4.19 

2 100 3 100 MR8010432MI-648032 110.5 156 2.5 3.60 

2 100 3 100 MR8010436MI-648036 110.5 156 2.5 4.92 

2 100 3 100 MR8010440MI-648040 110.5 156 2.5 5.47 

2 100 3 100 MR8010436MI-688036 117 156 2.5 4.44 

1 900 2 900 MR8811240MI-728840 123.5 169 2.5 6.04 

1 900 2 900 MR8811248MI-728848 123.5 169 2.5 7.26 

1 800 2 700 MR9211648MI-769248 132 172 3 7.48 

1 700 2 600 MR9612040MI-809640 140 177.5 3 6.54 

1 700 2 600 MR9612048MI-809648 140 177.5 3 7.84 

B-91


NTN 

Inch series 


Type MRMI 

d 

139.700203.200mm 






139.700(5 !/2) 

203.200( 8) 63.88 63.50(2 !/2) 3 165.100 6 325 000 680 000 33 000 69 500 

203.200( 8) 76.58 76.20(3) 3 165.100 5.5 390 000 870 000 39 500 88 500 

152.400(6) 231.775( 9 !/8) 76.58 76.20(3) 3 184.150 8.5 435 000 915 000 44 500 93 000 

165.100(6 !/2) 244.475( 9 %/8) 76.58 76.20(3) 3 196.850 8.5 455 000 990 000 46 500 101 000 

177.800(7) 257.175(10 !/8) 76.58 76.20(3) 3 209.550 8.5 475 000 1 060 000 48 500 109 000 

190.500(7 !/2) 269.875(10 %/8) 76.58 76.20(3) 4 222.250 7 495 000 1 140 000 50 500 116 000 

203.200(8) 282.575(11 !/8) 76.58 76.20(3) 4 234.950 7 510 000 1 210 000 52 000 124 000 



B-92


NTN 


r/min mm kg 



1 600 2 400 MR10412840MI-8810440 152.5 190 3 6.86 

1 600 2 400 MR10412848MI-8810448 152.5 190 3 8.22 

1 500 2 200 MR11614648MI-9611648 165.5 219 3 12.2 

1 300 2 000 MR12415448MI-10412448 178 231.5 3 13.1 

1 300 1 900 MR13216248MI-11213248 191 244 3 14.0 

1 200 1 800 MR14017048MI-12014048 206.5 254 4 15.0 

1 100 1 700 MR14817848MI-12814848 219 266.5 4 15.8 

B-93

Machined-ring needle roller bearings sealed type 

NTN 


Type RNA49L 

Type RNA49LL 

Type RNA49L 

(With single seal) 

Type RNA49LL 

(With double seal) 

FW 

1458mm 

Boundary dimensions Basic load ratings Limiting Bearing numbers Abutment Mass 

dynamic static dynamic static speeds dimensions 


grease Type Type Da Db ras 

Fw D C rs min 1) Cr Cor Cr Cor RNA49L RNA49LL max max max (approx.) 

+0.027 

14 +0.016 22 13 0.3 7 200 8 500 735 865 10 000 RNA4900L RNA4900LL 16 20 0.3 0.016 

+0.027 

16 +0.016 24 13 0.3 7 750 9 700 795 990 10 000 RNA4901L RNA4901LL 18 22 0.3 0.018 

+0.033 

20 +0.020 28 13 0.3 8 300 11 200 845 1 150 10 000 RNA4902L RNA4902LL 22 26 0.3 0.022 

+0.033 

22 +0.020 30 13 0.3 8 500 11 900 865 1 220 9 000 RNA4903L RNA4903LL 24 28 0.3 0.022 

+0.033 

25 +0.020 37 17 0.3 15 200 19 900 1 550 2 030 8 000 RNA4904L RNA4904LL 28 35 0.3 0.055 

+0.033 

30 +0.020 42 17 0.3 16 000 22 600 1 640 2 300 6 500 RNA4905L RNA4905LL 33 40 0.3 0.063 

+0.041 

35 +0.025 47 17 0.3 18 000 27 400 1 830 2 800 5 500 RNA4906L RNA4906LL 38 45 0.3 0.072 

+0.041 

42 +0.025 55 20 0.6 22 700 39 500 2 320 4 000 4 800 RNA4907L RNA4907LL 45 51 0.6 0.113 

+0.041 

48 +0.025 62 22 0.6 27 800 53 500 2 830 5 450 4 200 RNA4908L RNA4908LL 51 58 0.6 0.154 

+0.049 

52 +0.030 68 22 0.6 28 600 57 000 2 920 5 800 3 800 RNA4909L RNA4909LL 55 64 0.6 0.157 

+0.049 

58 +0.030 72 22 0.6 30 500 64 000 3 100 6 500 3 400 RNA4910L RNA4910LL 61 68 0.6 0.160 


B-94

Machined-ring needle roller bearings sealed type 

NTN 


Type NA49L 

Type NA49LL 

Type NA49L 

(With single seal) 

Type NA49LL 

(With double seal) 

d 

1050mm 

Boundary dimensions Basic load ratings Limiting Bearing numbers Abutment Mass 

dynamic static dynamic static speeds dimensions 


grease Type Type da Da Db ras 

d D B C rs min 1) F Cr Cor Cr Cor NA49L RNA49LL min max max max (approx.) 

10 22 14 13 0.3 14 7 200 8 500 735 865 10 000 NA4900L NA4900LL 12 16 20 0.3 0.025 

12 24 14 13 0.3 16 7 750 9 700 795 990 10 000 NA4901L NA4901LL 14 18 22 0.3 0.028 

15 28 14 13 0.3 20 8 300 11 200 845 1 150 10 000 NA4902L NA4902LL 17 22 26 0.3 0.036 

17 30 14 13 0.3 22 8 500 11 900 865 1 220 9 000 NA4903L NA4903LL 19 24 28 0.3 0.039 

20 37 18 17 0.3 25 15 200 19 900 1 550 2 030 8 000 NA4904L NA4904LL 22 28 35 0.3 0.080 

25 42 18 17 0.3 30 16 000 22 600 1 640 2 300 6 500 NA4905L NA4905LL 27 33 40 0.3 0.093 

30 47 18 17 0.3 35 18 000 27 400 1 830 2 800 5 500 NA4906L NA4906LL 32 38 45 0.3 0.107 

35 55 21 20 0.6 42 22 700 39 500 2 320 4 000 4 800 NA4907L NA4907LL 39 45 51 0.6 0.175 

40 62 23 22 0.6 48 27 800 53 500 2 830 5 450 4 200 NA4908L NA4908LL 44 51 58 0.6 0.252 

45 68 23 22 0.6 52 28 600 57 000 2 920 5 800 3 800 NA4909L NA4909LL 49 55 64 0.6 0.290 

50 72 23 22 0.6 58 30 500 64 000 3 100 6 500 3 400 NA4910L NA4910LL 54 61 68 0.6 0.295 


B-95

B-96

Machined Ring Needle Roller Bearings, 

Separable Type

Machined ring needle roller bearings, separable Type 

NTN 

Machined Ring Needle Roller Bearings, Separable Type 

The machined ring of this bearing type has no rib or 

side plate and, hence, the outer ring and the needle roller 

and cage assembly are separable from each other. 

The outer ring can’t regulate axial displacement of the 

needle roller and cage assembly and, therefore, the 

bearing construction must be so designed that the needle 

roller and cage assembly can be guided by a shaft or a 

housing. Furthermore, the outer ring, the needle roller 

and cage assembly separable from one another, and the 

inner ring can be press-fitted individually in a shaft or a 

housing. This could facilitate the bearing mounting work. 

This bearing type is suitable for an application requiring 

high running accuracy because the resultant radial 

clearance can be retained in a narrow range by selection 

and combination of appropriate inner ring, outer ring and 

needle roller and cage assembly. 

Bearing type 

Applied shaft 

diameter (mm) 



Remarks 

Type RNAO 

5100 

RNAO101710 T2 

Type RNAOZW 

Tail code 

Width 


Bore diameter 

Type code 

Type NAO 

 

880 

890 

[Tail code] 


ZW: Double-row type 

NAO101710 ZW 

Bearing with tail code T2 uses a 

polyamide resin cage and, 

therefore, it shall be used at 

allowable temperature 120˚C and, 

under continuous running, at 


For an application requiring high 

running accuracy, manufacture of 

the bearings conforming to JIS 

Class-6, -5 and -4 is also available 

on special request. 

Type NAOZW 

Tail code 

Width 


Bore diameter 

Type code 

1070 

[Tail code] 



B-98


NTN 

Accuracy of bearing 

The dimensional accuracy, profile accuracy and 

running accuracy of machined ring needle roller bearing, 

separate type (with inner ring) are specified in JIS B 1514 

(Accuracy of Rolling Bearings). (Refer to Table 4.3 of 

Section 4. "Bearing Tolerances" on page A-26.) 

Although the accuracy of NTN standard bearings 

conforms to JIS Class-0, NTN can also supply bearings 

conforming to JIS Class-6, -5 and -4. Feel free to contact 

NTN for the further detail of these bearings. 

The dimensional tolerances for the roller inscribed 

circle diameters (Fw) of the bearing type without inner ring 

conform to ISO Tolerance Range Class-F6. The outer 

ring and the needle roller and cage assembly are 

supplied in set and, therefore, the bearing must be 

installed with the combination of these two in set 

remained unchanged. 

Particularly when high bearing accuracy is required, a 

bearing with grinding allowance for its inner ring raceway 

surface can be supplied upon request from a client. In 

that case, however, the client is requested to finish the 

inner ring to the intended dimension after having installed 

on a shaft. 


Table 5.1 of Subsection 5.1 "Radial Clearance in 

Bearings" (page A-30) shows the radial clearance of 

bearings with inner ring. Because of the narrow noninterchangeable 

clearance range, the bearings shipped 

after adjusted to a specific non-interchangeable clearance 

must be installed with the clearance remained 

unchanged. 

The respective fitting tolerances for shaft and housing 

bore on/in which bearing with inner ring is press-fitted are 

per Table 6.3 of 6.4 "Recommended Bearing Fits" 

(page A-34) which specifies them according to load 

characteristic, load magnitude, and shaft and housing 

bore sizes. 

The profile accuracy and surface roughness of shaft 

and housing to be applied are as specified in Table 7.3 of 

7.3 "Shaft and Housing Accuracy" (page A-39). 

A shaft is used as the direct raceway surface for a 

bearing without inner ring and, in this case, the shaft 

diameter (raceway diameter) tolerance is per Table 1 

specifying the tolerances according to each running 

clearance. And K7 tolerance generally in broad use is 

applied as the dimensional tolerance for the housing 

bore. Feel free to contact NTN for application of housing 

bore tolerance other than K7. 

For the profile accuracy, surface roughness and 

hardness of a shaft acting as the raceway surface, refer 

to Table 7.4 of 7.4 "Raceway Surface Accuracy" (page 

A-39). 

Dimension of oil hole in outer ring 

The outer ring of bearing Type ZW is provided with an 

oil hole and an oil groove to facilitate oil lubrication to 

bearing. 

Table 1 shows the oil hole dimension every outer ring 

diameter. 

Table 1 Oil hole dimension 

Outer ring outer diameter 

over incl. 

 

20 

40 

80 

20 

40 

80 

200 

Oil hole dia. 

(mm) 

2.0 

2.5 

3.0 

3.5 

Number of 

oil hole 

Mounting relations 

The inner ring and outer ring of any machined ring 

needle roller bearing, separable type must both be 

positioned in axial direction by shoulder or a snap ring. 

For the shoulder dimension and corner roundness (ra) 

of the shaft and the housing are as specified in applicable 

"Dimensions Table". The cage must be guided by the 

shaft or the side face of the housing shoulder, but the 

guide surface must be finished by, at least, grinding for 

deburring. 

1 

1 

1 

1 

B-99


NTN 


Type RNAO 

Type RNAOZW 

Type RNAO 

Type RNAOZW 

FW 

520mm 




grease oil 

Fw D C rs min 1) E Cr Cor Cr Cor 

5 +0.018 

+0.010 10 8 0.15 8 2 640 2 190 269 224 27 000 40 000 RNAO- 5108T2 

6 

+0.018 

+0.010 13 8 0.3 9 2 660 2 280 272 233 25 000 37 000 RNAO- 6138T2 

7 

+0.022 

+0.013 14 8 0.3 10 2 670 2 350 272 239 23 000 34 000 RNAO- 7148T2 

8 

+0.022 

+0.013 

15 10 0.3 11 4 000 4 100 410 420 21 000 32 000 RNAO- 81510T2 

16 20 0.3 12 7 950 8 350 810 850 21 000 32 000 RNAO- 81620ZWT2 

10 

12 

+0.022 

+0.013 

+0.027 

+0.016 

17 10 0.3 13 4 550 5 100 460 520 19 000 28 000 RNAO-101710T2 

20 12 0.3 16 7 100 5 950 720 610 19 000 28 000 RNAO-102012 

19 13.5 0.3 15 6 000 7 700 615 785 17 000 26 000 RNAO-121913.5 

22 12 0.3 18 8 650 8 000 880 815 17 000 26 000 RNAO-122212 

22 13 0.3 18 8 300 10 100 845 1 030 16 000 24 000 RNAO-142213 

14 

+0.027 

+0.016 22 20 0.3 18 11 800 16 000 1 210 1 630 16 000 24 000 RNAO-142220ZW 

26 12 0.3 20 9 350 9 150 955 930 16 000 24 000 RNAO-142612 

15 

+0.027 

+0.016 

23 13 0.3 19 8 250 10 200 840 1 040 15 000 23 000 RNAO-152313 

23 20 0.3 19 11 700 16 100 1 200 1 640 15 000 23 000 RNAO-152320ZW 

24 13 0.3 20 9 050 11 800 925 1 200 15 000 23 000 RNAO-162413 

16 

+0.027 

+0.016 24 20 0.3 20 12 900 18 500 1 310 1 890 15 000 23 000 RNAO-162420ZW 

28 12 0.3 22 11 700 12 500 1 190 1 280 15 000 23 000 RNAO-162812 

25 13 0.3 21 9 400 12 600 960 1 280 15 000 22 000 RNAO-172513 

17 

+0.027 

+0.016 25 20 0.3 21 12 800 18 600 1 300 1 900 15 000 22 000 RNAO-172520ZW 

25 26 0.3 21 16 100 25 200 1 640 2 570 15 000 22 000 RNAO-172526ZW 

18 

+0.027 

+0.016 

26 13 0.3 22 8 900 11 900 910 1 210 14 000 21 000 RNAO-182613 

26 20 0.3 22 12 700 18 800 1 290 1 910 14 000 21 000 RNAO-182620ZW 

30 12 0.3 24 12 300 13 800 1 250 1 410 14 000 21 000 RNAO-183012 

30 24 0.3 24 21 100 27 700 2 150 2 820 14 000 21 000 RNAO-183024ZW 

28 13 0.3 24 10 000 14 300 1 020 1 460 13 000 20 000 RNAO-202813 

20 +0.033 

+0.020 

28 26 0.3 24 17 100 28 600 1 750 2 910 13 000 20 000 RNAO-202826ZW 

32 12 0.3 26 12 900 15 100 1 320 1 540 13 000 20 000 RNAO-203212 


B-100


NTN 

Abutment 

dimensions 

mm 

Mass 

kg 

db Da Db ras 


7.7 8.8 5.3 0.15 0.003 

8.7 11 6.3 0.3 0.006 

9.7 12 7.3 0.3 0.006 

10.7 13 8.3 0.3 0.008 

11.7 14 8.3 0.3 0.017 

12.7 15 10.3 0.3 0.010 

15.7 18 10.3 0.3 0.018 

14.7 17 12.3 0.3 0.015 

17.6 20 12.3 0.3 0.019 

17.6 20 14.4 0.3 0.018 

17.6 20 14.4 0.3 0.027 

19.6 24 14.4 0.3 0.029 

18.6 21 15.4 0.3 0.020 

18.6 21 15.4 0.3 0.031 

19.6 22 16.4 0.3 0.021 

19.6 22 16.4 0.3 0.032 

21.6 26 16.4 0.3 0.032 

20.6 23 17.4 0.3 0.022 

20.6 23 17.4 0.3 0.034 

20.6 23 17.4 0.3 0.044 

21.6 24 18.4 0.3 0.022 

21.6 24 18.4 0.3 0.033 

23.6 28 18.4 0.3 0.035 

23.6 28 18.4 0.3 0.069 

23.6 26 20.4 0.3 0.025 

23.6 26 20.4 0.3 0.050 

25.6 30 20.4 0.3 0.038 

B-101


NTN 


Type RNAO 

Type RNAOZW 

Type RNAO 

Type RNAOZW 

FW 

2040mm 




grease oil 


20 +0.033 32 24 0.3 26 22 100 30 000 2 260 3 100 13 000 20 000 RNAO-203224ZW 

+0.020 

22 

25 

30 13 0.3 26 10 200 15 200 1 040 1 550 12 000 18 000 RNAO-223013 

30 26 0.3 26 17 500 30 500 1 790 3 100 12 000 18 000 RNAO-223026ZW 

35 16 0.3 29 18 700 22 700 1 910 2 310 12 000 18 000 RNAO-223516 

35 32 0.3 29 32 000 45 500 3 300 4 650 12 000 18 000 RNAO-223532ZW 

35 17 0.3 29 14 200 24 000 1 450 2 450 11 000 16 000 RNAO-253517 

35 26 0.3 29 18 400 33 500 1 880 3 450 11 000 16 000 RNAO-253526ZW 

37 16 0.3 32 19 500 24 700 1 990 2 520 11 000 16 000 RNAO-253716 

37 32 0.3 32 33 500 49 500 3 400 5 050 11 000 16 000 RNAO-253732ZW 

+0.033 

26 +0.020 39 13 0.3 30 11 800 19 200 1 200 1 960 10 000 15 000 RNAO-263913 

28 

30 

40 16 0.3 35 21 200 28 400 2 160 2 900 9 500 14 000 RNAO-284016 

40 32 0.3 35 36 500 57 000 3 700 5 800 9 500 14 000 RNAO-284032ZW 

40 17 0.3 35 19 400 32 500 1 970 3 350 9 000 13 000 RNAO-304017 

40 26 0.3 35 25 200 46 000 2 570 4 650 9 000 13 000 RNAO-304026ZW 

42 16 0.3 37 21 900 30 500 2 230 3 100 9 000 13 000 RNAO-304216 

42 32 0.3 37 37 500 60 500 3 850 6 200 9 000 13 000 RNAO-304232ZW 

+0.041 

32 +0.025 42 13 0.3 37 14 500 23 000 1 480 2 350 8 500 13 000 RNAO-324213 

35 

+0.033 

+0.020 

+0.033 

+0.020 

+0.033 

+0.020 

+0.033 

+0.020 

+0.041 

+0.025 

45 13 0.3 40 15 200 25 100 1 550 2 560 7 500 11 000 RNAO-354513 

45 17 0.3 40 20 000 36 000 2 040 3 650 7 500 11 000 RNAO-354517 

45 26 0.3 40 26 100 50 000 2 660 5 100 7 500 11 000 RNAO-354526ZW 

47 16 0.3 42 24 100 36 000 2 450 3 650 7 500 11 000 RNAO-354716 

47 18 0.3 42 24 700 37 000 2 510 3 750 7 500 11 000 RNAO-354718 

47 32 0.3 42 41 500 71 500 4 200 7 300 7 500 11 000 RNAO-354732ZW 

37 

+0.041 

+0.025 

47 13 0.3 42 15 900 27 100 1 620 2 770 7 000 11 000 RNAO-374713 

52 18 0.3 44 26 300 41 000 2 680 4 150 7 000 11 000 RNAO-375218 

50 17 0.3 45 21 800 41 500 2 220 4 250 6 500 10 000 RNAO-405017 

40 

+0.041 

+0.025 50 34 0.3 45 37 500 83 000 3 800 8 500 6 500 10 000 RNAO-405034ZW 

55 20 0.3 47 31 000 51 500 3 150 5 250 6 500 10 000 RNAO-405520 


B-102


NTN 

Abutment 

dimensions 

mm 

Mass 

kg 

db Da Db ras 


25.6 30 20.4 0.3 0.080 

25.6 28 22.4 0.3 0.027 

25.6 28 22.4 0.3 0.054 

28.4 33 22.4 0.3 0.059 

28.4 33 22.4 0.3 0.118 

28.4 33 25.6 0.3 0.053 

28.4 33 25.6 0.3 0.076 

31.4 35 25.6 0.3 0.060 

31.4 35 25.6 0.3 0.119 

29.4 37 26.6 0.3 0.060 

34.4 38 28.6 0.3 0.061 

34.4 38 28.6 0.3 0.122 

34.4 38 30.6 0.3 0.060 

34.4 38 30.6 0.3 0.094 

36.4 40 30.6 0.3 0.069 

36.4 40 30.6 0.3 0.137 

36.4 40 32.6 0.3 0.049 

39.4 43 35.6 0.3 0.053 

39.4 43 35.6 0.3 0.069 

39.4 43 35.6 0.3 0.091 

41.4 45 35.6 0.3 0.078 

41.4 45 35.6 0.3 0.089 

41.4 45 35.6 0.3 0.156 

41.4 45 37.6 0.3 0.056 

43.4 50 37.6 0.3 0.125 

44.4 48 40.6 0.3 0.074 

44.4 48 40.6 0.3 0.152 

46.2 53 40.6 0.3 0.145 

B-103


NTN 


Type RNAO 

Type RNAOZW 

Type RNAO 

Type RNAOZW 

FW 

4085mm 




grease oil 


40 +0.041 55 40 0.3 48 56 500 102 000 5 750 10 400 6 500 10 000 RNAO-40 5540ZW 

+0.025 

45 

+0.041 

+0.025 

55 17 0.3 50 22 300 44 500 2 280 4 550 6 000 9 000 RNAO-45 5517 

55 34 0.3 50 38 500 89 500 3 900 9 100 6 000 9 000 RNAO-45 5534ZW 

62 20 0.3 53 36 000 59 000 3 650 6 000 6 000 9 000 RNAO-45 6220 

62 40 0.3 53 61 500 118 000 6 250 12 000 6 000 9 000 RNAO-45 6240ZW 

50 

+0.041 

+0.025 

62 20 0.3 55 27 900 62 000 2 850 6 300 5 500 8 000 RNAO-50 6220 

62 40 0.3 55 48 000 124 000 4 900 12 600 5 500 8 000 RNAO-50 6240ZW 

65 20 0.3 58 38 500 67 500 3 950 6 850 5 500 8 000 RNAO-50 6520 

65 40 0.6 58 66 500 135 000 6 750 13 700 5 500 8 000 RNAO-50 6540ZW 

68 20 0.6 60 28 800 66 500 2 940 6 750 4 800 7 500 RNAO-55 6820 

68 25 0.6 63 50 500 97 500 5 150 9 950 4 800 7 500 RNAO-55 6825 

55 

+0.049 

+0.030 68 40 0.6 60 49 500 133 000 5 050 13 500 4 800 7 500 RNAO-55 6840ZW 

72 20 0.6 63 39 000 70 000 3 950 7 100 4 800 7 500 RNAO-55 7220 

72 40 0.6 63 66 500 140 000 6 800 14 200 4 800 7 500 RNAO-55 7240ZW 

75 46 1 68 76 000 170 000 7 750 17 400 4 400 6 500 RNAO-60 7546ZW 

60 

+0.049 

+0.030 78 20 1 68 40 000 75 000 4 100 7 650 4 400 6 500 RNAO-60 7820 

78 40 1 68 69 000 150 000 7 050 15 300 4 400 6 500 RNAO-60 7840ZW 

65 

70 

75 

+0.049 

+0.030 

+0.049 

+0.030 

+0.049 

+0.030 

85 30 1 73 61 000 132 000 6 200 13 400 4 100 6 000 RNAO-65 8530 

85 60 1 73 104 000 263 000 10 600 26 800 4 100 6 000 RNAO-65 8560ZW 

90 30 1 78 65 500 149 000 6 700 15 200 3 800 5 500 RNAO-70 9030 

90 60 1 78 112 000 297 000 11 500 30 500 3 800 5 500 RNAO-70 9060ZW 

95 30 1 83 67 500 157 000 6 850 16 100 3 600 5 500 RNAO-75 9530 

95 60 1 83 115 000 315 000 11 800 32 000 3 600 5 500 RNAO-75 9560ZW 

80 

+0.049 

+0.030 

95 30 1 86 57 000 159 000 5 800 16 200 3 300 5 000 RNAO-80 9530 

95 56 1 88 105 000 284 000 10 700 29 000 3 300 5 000 RNAO-80 9556ZW 

100 30 1 88 69 000 166 000 7 050 17 000 3 300 5 000 RNAO-8010030 

100 60 1 88 119 000 335 000 12 100 34 000 3 300 5 000 RNAO-8010060ZW 

+0.058 

85 +0.036 105 25 1 93 61 500 146 000 6 250 14 900 3 100 4 700 RNAO-8510525 


B-104


NTN 

Abutment 

dimensions 

mm 

Mass 

kg 

db Da Db ras 


47.2 53 40.6 0.3 0.275 

49.2 53 45.6 0.3 0.083 

49.2 53 45.6 0.3 0.165 

52.2 60 45.6 0.3 0.175 

52.2 60 45.6 0.3 0.377 

54.2 60 50.6 0.3 0.140 

54.2 60 50.6 0.3 0.295 

57.2 63 50.6 0.3 0.168 

57.2 61 50.6 0.6 0.355 

59.4 64 55.8 0.6 0.166 

62.4 64 55.8 0.6 0.200 

59.4 64 55.8 0.6 0.310 

62.4 68 55.8 0.6 0.216 

62.4 68 55.8 0.6 0.425 

67.2 70 60.8 1 0.461 

67.2 73 60.8 1 0.255 

67.2 73 60.8 1 0.500 

72.2 80 66 1 0.464 

72.2 80 66 1 0.951 

77.2 85 71 1 0.499 

77.2 85 71 1 1.00 

82.2 90 76 1 0.520 

82.2 90 76 1 1.04 

85.2 90 81 1 0.405 

87.2 90 81 1 0.755 

87.2 95 81 1 0.580 

87.2 95 81 1 1.10 

92.2 100 86 1 0.459 

B-105


NTN 


Type RNAO 

Type RNAO 

FW 

85100mm 




grease oil 


85 +0.058 105 30 1 93 71 000 175 000 7 200 17 900 3 100 4 700 RNAO- 8510530 

+0.036 

90 

+0.058 

+0.036 

105 26 1 98 64 000 157 000 6 550 16 000 3 000 4 400 RNAO- 9010526 

110 30 1 98 72 500 184 000 7 400 18 800 3 000 4 400 RNAO- 9011030 

95 

+0.058 

+0.036 115 30 1 103 74 000 193 000 7 550 19 600 2 800 4 200 RNAO- 9511530 

100 

+0.058 

+0.035 120 30 1 108 76 000 201 000 7 700 20 500 2 700 4 000 RNAO-10012030 


B-106


NTN 

Abutment 

dimensions 

mm 

Mass 

kg 

db Da Db ras 


92.2 100 86 1 0.585 

97.2 100 91 1 0.373 

97.2 105 91 1 0.610 

102.2 110 96 1 0.640 

107.2 115 101 1 0.694 

B-107


NTN 


Type NAO 

Type NAOZW 

Type NAO 

Type NAOZW 

d 

630mm 




grease oil 

d D C rs min 1) F E Cr Cor Cr Cor 

6 17 10 0.3 10 13 4 550 5 100 460 520 19 000 28 000 NAO- 61710T2 

7 20 12 0.3 10 16 7 100 5 950 720 610 19 000 28 000 NAO- 72012 

9 22 12 0.3 12 18 8 650 8 000 880 815 17 000 26 000 NAO- 92212 

22 13 0.3 14 18 8 300 10 100 845 1 030 16 000 24 000 NAO-102213 

10 22 20 0.3 14 18 11 800 16 000 1 210 1 630 16 000 24 000 NAO-102220ZW 

26 12 0.3 14 20 9 350 9 150 955 930 16 000 24 000 NAO-102612 

24 13 0.3 16 20 9 050 11 800 925 1 200 15 000 23 000 NAO-122413 

12 24 20 0.3 16 20 12 900 18 500 1 310 1 890 15 000 23 000 NAO-122420ZW 

28 12 0.3 16 22 11 700 12 500 1 190 1 280 15 000 23 000 NAO-122812 

28 13 0.3 20 24 10 000 14 300 1 020 1 460 13 000 20 000 NAO-152813 

15 28 26 0.3 20 24 17 100 28 600 1 750 2 910 13 000 20 000 NAO-152826ZW 

32 12 0.3 20 26 12 900 15 100 1 320 1 540 13 000 20 000 NAO-153212 

17 

20 

25 

30 13 0.3 22 26 10 200 15 200 1 040 1 550 12 000 18 000 NAO-173013 

30 26 0.3 22 26 17 500 30 500 1 790 3 100 12 000 18 000 NAO-173026ZW 

35 16 0.3 22 29 18 700 22 700 1 910 2 310 12 000 18 000 NAO-173516 

35 32 0.3 22 29 32 000 45 500 3 300 4 650 12 000 18 000 NAO-173532ZW 

35 17 0.3 25 29 14 200 24 000 1 450 2 450 11 000 16 000 NAO-203517 

35 26 0.3 25 29 18 400 33 500 1 880 3 450 11 000 16 000 NAO-203526ZW 

37 16 0.3 25 32 19 500 24 700 1 990 2 520 11 000 16 000 NAO-203716 

37 32 0.3 25 32 33 500 49 500 3 400 5 050 11 000 16 000 NAO-203732ZW 

40 17 0.3 30 35 19 400 32 500 1 970 3 350 9 000 13 000 NAO-254017 

40 26 0.3 30 35 25 200 46 000 2 570 4 650 9 000 13 000 NAO-254026ZW 

42 16 0.3 30 37 21 900 30 500 2 230 3 100 9 000 13 000 NAO-254216 

42 32 0.3 30 37 37 500 60 500 3 850 6 200 9 000 13 000 NAO-254232ZW 

29 42 13 0.3 32 37 14 500 23 000 1 480 2 350 8 500 13 000 NAO-294213 

45 13 0.3 35 40 15 200 25 100 1 550 2 560 7 500 11 000 NAO-304513 

30 45 17 0.3 35 40 20 000 36 000 2 040 3 650 7 500 11 000 NAO-304517 

45 26 0.3 35 40 26 100 50 000 2 660 5 100 7 500 11 000 NAO-304526ZW 


B-108


NTN 

Abutment 

dimensions 

mm 

Mass 

da db Da Db ras 


8 12.7 15 10.3 0.3 0.014 

9 15.7 18 10.3 0.3 0.022 

11 17.6 20 12.3 0.3 0.024 

12 17.6 20 14.4 0.3 0.026 

12 17.6 20 14.4 0.3 0.039 

12 19.6 24 14.4 0.3 0.036 

14 19.6 22 16.4 0.3 0.030 

14 19.6 22 16.4 0.3 0.044 

14 21.6 26 16.4 0.3 0.040 

17 23.6 26 20.4 0.3 0.029 

17 23.6 26 20.4 0.3 0.075 

17 25.6 30 20.4 0.3 0.050 

19 25.6 28 22.4 0.3 0.042 

19 25.6 28 22.4 0.3 0.081 

19 28.4 33 22.4 0.3 0.078 

19 28.4 33 22.4 0.3 0.148 

22 28.4 33 25.6 0.3 0.076 

22 28.4 33 25.6 0.3 0.112 

22 31.4 35 25.6 0.3 0.082 

22 31.4 35 25.6 0.3 0.155 

27 34.4 38 30.6 0.3 0.088 

27 34.4 38 30.6 0.3 0.130 

27 36.4 40 30.6 0.3 0.086 

27 36.4 40 30.6 0.3 0.190 

31 36.4 40 32.6 0.3 0.062 

32 39.4 43 35.6 0.3 0.077 

32 39.4 43 35.6 0.3 0.102 

32 39.4 43 35.6 0.3 0.157 

kg 

B-109


NTN 


Type NAO 

Type NAOZW 

Type NAO 

Type NAOZW 

d 

3065mm 




grease oil 


30 

47 16 0.3 35 42 24 100 36 000 2 450 3 650 7 500 11 000 NAO-304716 

47 18 0.3 35 42 24 700 37 000 2 510 3 750 7 500 11 000 NAO-304718 

47 32 0.3 35 42 41 500 71 500 4 200 3 700 7 500 11 000 NAO-304732ZW 

52 18 0.3 37 44 26 300 41 000 2 680 4 150 7 000 11 000 NAO-305218 

33 47 13 0.3 37 42 15 900 27 100 1 620 2 770 7 000 11 000 NAO-334713 

35 

50 17 0.3 40 45 21 800 41 500 2 220 4 250 6 500 10 000 NAO-355017 

50 34 0.3 40 45 37 500 83 000 3 800 8 500 6 500 10 000 NAO-355034ZW 

55 20 0.3 40 47 31 000 51 500 3 150 5 250 6 500 10 000 NAO-355520 

55 40 0.3 40 48 56 500 102 000 5 750 10 400 6 500 10 000 NAO-355540ZW 

55 17 0.3 45 50 22 300 44 500 2 280 4 550 6 000 9 000 NAO-405517 

55 34 0.3 45 50 38 500 89 500 3 900 9 100 6 000 9 000 NAO-405534ZW 

40 62 20 0.3 45 53 36 000 59 000 3 650 6 000 6 000 9 000 NAO-406220 

62 40 0.3 45 53 61 500 118 000 6 250 12 000 6 000 9 000 NAO-406240ZW 

65 20 0.3 50 58 38 500 67 500 3 950 6 850 5 500 8 000 NAO-406520 

45 

50 

55 

60 

65 

62 20 0.3 50 55 27 900 62 000 2 850 6 300 5 500 8 000 NAO-456220 

62 40 0.3 50 55 48 000 124 000 4 900 12 600 5 500 8 000 NAO-456240ZW 

72 20 0.6 55 63 39 000 70 000 3 950 7 100 4 800 7 500 NAO-457220 

72 40 0.6 55 63 66 500 140 000 6 800 14 200 4 800 7 500 NAO-457240ZW 

68 20 0.6 55 60 28 800 66 500 2 940 6 750 4 800 7 500 NAO-506820 

68 40 0.6 55 60 49 500 133 000 5 050 13 500 4 800 7 500 NAO-506840ZW 

78 20 1 60 68 40 000 75 000 4 100 7 650 4 400 6 500 NAO-507820 

78 40 1 60 68 69 000 150 000 7 050 15 300 4 400 6 500 NAO-507840ZW 

85 30 1 65 73 61 000 132 000 6 200 13 400 4 100 6 000 NAO-558530 

85 60 1 65 73 104 000 263 000 10 600 26 800 4 100 6 000 NAO-558560ZW 

90 30 1 70 78 65 500 149 000 6 700 15 200 3 800 5 500 NAO-609030 

90 60 1 70 78 112 000 297 000 11 500 30 500 3 800 5 500 NAO-609060ZW 

95 30 1 75 83 67 500 157 000 6 850 16 100 3 600 5 500 NAO-659530 

95 60 1 75 83 115 000 315 000 11 800 32 000 3 600 5 500 NAO-659560ZW 


B-110


NTN 

Abutment 

dimensions 

mm 

Mass 



32 41.4 45 35.6 0.3 0.109 

32 41.4 45 35.6 0.3 0.119 

32 41.4 45 35.6 0.3 0.205 

32 43.4 50 37.6 0.3 0.177 

35 41.4 45 37.6 0.3 0.085 

37 44.4 48 40.6 0.3 0.113 

37 44.4 48 40.6 0.3 0.225 

37 46.2 53 40.6 0.3 0.190 

37 47.2 53 40.6 0.3 0.360 

42 49.2 53 45.6 0.3 0.127 

42 49.2 53 45.6 0.3 0.250 

42 52.2 60 45.6 0.3 0.230 

42 52.2 60 45.6 0.3 0.385 

42 57.2 63 50.6 0.3 0.279 

47 54.2 60 50.6 0.3 0.192 

47 54.2 60 50.6 0.3 0.385 

49 62.4 68 55.8 0.6 0.335 

49 62.4 68 55.8 0.6 0.660 

54 59.4 64 55.8 0.6 0.230 

54 59.4 64 55.8 0.6 0.440 

55 67.2 73 60.8 1 0.410 

55 67.2 73 60.8 1 0.755 

60 72.2 80 66 1 0.680 

60 72.2 80 66 1 1.35 

65 77.2 85 71 1 0.720 

65 77.2 85 71 1 1.45 

70 82.2 90 76 1 0.770 

70 82.2 90 76 1 1.54 

kg 

B-111


NTN 


Type NAO 

Type NAOZW 

Type NAO 

Type NAOZW 

d 

7090mm 




grease oil 


70 

75 

95 30 1 80 86 57 000 159 000 5 800 16 200 3 300 5 000 NAO-70 9530 

95 56 1 80 88 105 000 284 000 10 700 29 000 3 300 5 000 NAO-70 9556ZW 

100 30 1 80 88 69 000 166 000 7 050 17 000 3 300 5 000 NAO-7010030 

100 60 1 80 88 119 000 335 000 12 100 34 000 3 300 5 000 NAO-7010060ZW 

105 25 1 85 93 61 500 146 000 6 250 14 900 3 100 4 700 NAO-7510525 

105 30 1 85 93 71 000 175 000 7 200 17 900 3 100 4 700 NAO-7510530 

80 110 30 1 90 98 72 500 184 000 7 400 18 800 3 000 4 400 NAO-8011030 

85 115 30 1 95 103 74 000 193 000 7 550 19 600 2 800 4 200 NAO-8511530 

90 120 30 1 100 108 76 000 201 000 7 700 20 500 2 700 4 000 NAO-9012030 


B-112


NTN 

Abutment 

dimensions 

mm 

Mass 



75 85.2 90 81 1 0.675 

75 87.2 90 81 1 1.26 

75 87.2 95 81 1 0.850 

75 87.2 95 81 1 1.70 

80 92.2 100 86 1 0.700 

80 92.2 100 86 1 0.880 

85 97.2 105 91 1 0.920 

90 102.2 110 96 1 0.960 

95 107.2 115 101 1 1.04 

kg 

B-113

B-114

Inner Rings

Inner Rings 

NTN 

Inner Rings 

Inner Rings 

Many of the needle roller bearings use a shaft as the 

direct raceway surface without using inner ring. However, 

it is recommended to use any of the inner rings described 

hereunder, together with needle roller bearing, where 

applicable shaft can not be surface-hardened and 

surface-finished by grinding. Any inner rings are made of 

high carbon chrome bearing steel and finished by 

grinding after heat-treated. 

It is desirable to use an inner ring of wide width, where 

the axial displacement of a shaft is great and also a seal 

is used at the outer side of bearing. 

Types and Designs 

NTN inner rings are available in both of IR type with 

boundary dimensions of metric system and MI type with 

boundary dimensions of inch system. The both ends of 

inner ring raceway are chamfered in taper form to 

facilitate fitting of the inner ring. On the other hand, any 

inner rings with an asterisk -mark are fine-chamfered 

so as to allow greater axial displacement. In addition to 

these inner rings, manufacture of special inner ring type 

(with tail code: D) with oil hole on its center is also 

available. 

Particularly where high running accuracy is required, on 

occasion the raceway surface of inner ring is finished by 

grinding after fitted on a shaft. In such a case, an inner 

ring with grinding allowance for its raceway can be 

supplied. Feel free to contact NTN for the detail of such 

an inner ring. 

Dimensional accuracy for inner ring 

The dimensional accuracy (bore diameter "d", width "B" 

and chamfer dimension "rs min"), profile accuracy and 

running accuracy of the inner rings are as shown in 

Tables 4.3 and 4.5 of Section 4 "Bearing accuracy" 

(page A-26). And the standard accuracy class of these 

items conforms to JIS Class-0, but other inner rings 

conforming to JIS Class-5 and -4 are also offerable on 

request. 

For the dimensional tolerance for raceway diameter (F) 

shown in applicable Dimension Table, the inner ring is 

finished so the radial clearance comes to ordinary 

clearance (refer to Table 5.1 of 5.2 "Running clearance" 

(page A-30) when it is combined with needle rollers. 

Feel free to contact NTN for use of an inner ring 

subjected to radial clearance other than ordinary 

clearance. 

Composition of nominal number 

Nominal number comprises type code (IR or MI), 

dimension code [bore dia. (d)raceway dia. (F)width 

(B)] and tail code. 

The dimension of inch series MI type is expressed at 

the unit of 1/16 inch. 

IR 202518 D 

Tail code 

Dimension code 

Fig. 1 

Type code 

B-116

Inner rings 

NTN 

Type IR 

d 

510mm 

Boundary dimensions Bearing numbers Abutment Mass 

dimensions 

mm mm kg 

d F 1) B rs min 2) t min max (approx.) 

7 10 0.15 1 IR 5 710 6.2 0.15 0.0014 

5 8 0 

0.006 12 0.3 1 IR 5 812 7 0.3 0.0028 

8 16 0.3 IR 5 816 7 0.3 0.0038 

da 

ras 

6 

8 10 0.15 1 IR 6 810 7.2 0.15 0.0017 

9 12 0.3 1 IR 6 912 8 0.3 0.0032 

9 0 16 0.3 1 IR 6 916 8 0.3 0.0043 

10 

0.006 

10 0.3 1 IR 61010 8 0.3 0.0037 

10 12 0.3 IR 61012D 8 0.3 0.0046 

10 13 0.3 1 IR 61013 8 0.3 0.0050 

9 10 0.15 1 IR 7 910 8.2 0.15 0.0019 

10 

0 

10.5 0.3 1 IR 71010.5 9 0.3 0.0031 

7 10 0.006 12 0.3 1 IR 71012 9 0.3 0.0036 

10 16 0.3 1 IR 71016 9 0.3 0.0049 

12 

0 

0.008 16 0.3 1 IR 71216 9 0.3 0.0093 

10 

0 

0.006 11 0.15 1 IR 81011 9.2 0.15 0.0024 

12 10 0.3 1 IR 81210 10 0.3 0.0048 

8 

12 10.5 0.3 1 IR 81210.5 10 0.3 0.0050 

12 0 

0.008 

12 0.3 IR 81212D 10 0.3 0.0057 

12 12.5 0.3 1 IR 81212.5 10 0.3 0.0059 

14 16 0.3 1 IR 81416 10 0.3 0.013 

9 

12 11 0.3 1 IR 91211 11 0.3 0.0041 

12 0 12 0.3 1 IR 91212 11 0.3 0.0045 

12 

0.008 

16 0.3 1 IR 91216 11 0.3 0.0061 

15 16 0.3 1 IR 91516 11 0.3 0.014 

10 

13 12.5 0.3 1 IR101312.5 12 0.3 0.0052 

14 12 0.3 1 IR101412 12 0.3 0.0073 

14 0 13 0.3 1 IR101413 12 0.3 0.0074 

14 

0.008 

14 0.3 IR101414D 12 0.3 0.0080 

14 16 0.3 IR101416 12 0.3 0.0092 

14 20 0.3 1 IR101420 12 0.3 0.012 

Note 1) Dimensional tolerance to secure ordinary clearance when any of these inner rings is combined with needle roller bearing with no inner ring. 

2) Allowable minimum chamfer dimension r . 

Remarks: 1. Nominal number plus code "D" represents inner ring with oil hole. 

2. Nominal number plus -mark represents inner ring with fine-chamfered outer surface. 

B-117

Inner rings 

NTN 

Type IR 

d 

1015mm 


dimensions 

mm mm kg 


15 15.5 0.3 1 IR101515.5 12 0.3 0.012 

10 15 

0 

0.008 20.5 0.3 1 IR101520.5 12 0.3 0.015 

16 16 0.3 1 IR101616 12 0.3 0.015 

12 

15 12 0.3 1 IR121512 14 0.3 0.0058 

15 12.5 0.3 1 IR121512.5 14 0.3 0.0061 

15 16 0.3 1 IR121516 14 0.3 0.0078 

15 16.5 0.3 IR121516.5 14 0.3 0.0080 

15 22.5 0.3 IR121522.5 14 0.3 0.011 

16 12 0.3 1.5 IR121612 14 0.3 0.0079 

16 0 13 0.3 1.5 IR121613 14 0.3 0.0087 

16 0.008 

14 0.3 IR121614D 14 0.3 0.0095 

16 16 0.3 1.5 IR121616 14 0.3 0.011 

16 20 0.3 1.5 IR121620 14 0.3 0.014 

16 22 0.3 1.5 IR121622 14 0.3 0.015 

17 20.5 0.3 1.5 IR121720.5 14 0.3 0.019 

17 25.5 0.3 1.5 IR121725.5 14 0.3 0.024 

18 16 0.3 1.5 IR121816 14 0.3 0.018 

0 

14 17 0.008 17 0.3 1.5 IR141717 16 0.3 0.0095 

18 12.5 0.3 1.5 IR151812.5 17 0.3 0.0072 

18 16 0.3 1.5 IR151816 17 0.3 0.0093 

18 0 16.5 0.3 1.5 IR151816.5 17 0.3 0.0096 

18 0.008 

17.5 0.3 1.5 IR151817.5 17 0.3 0.010 

18 20.5 0.3 1.5 IR151820.5 17 0.3 0.012 

18 25.5 0.3 1.5 IR151825.5 17 0.3 0.015 

15 19 16 0.3 1.5 IR151916 17 0.3 0.013 

19 20 0.3 1.5 IR151920 17 0.3 0.016 

20 12 0.3 1.5 IR152012 17 0.3 0.012 

20 

0 

0.009 13 0.3 1.5 IR152013 17 0.3 0.014 

20 14 0.3 IR152014D 17 0.3 0.015 

20 18 0.3 1.5 IR152018 17 0.3 0.019 

20 20.5 0.3 1.5 IR152020.5 17 0.3 0.021 





B-118 

da 

ras

Inner rings 

NTN 

d 

1520mm 


dimensions 

mm mm kg 


da 

ras 

15 

17 

20 23 0.3 IR152023 17 0.3 0.024 

20 0 26 0.3 1.5 IR152026 17 0.3 0.027 

20 0.009 30.5 0.3 1.5 IR152030.5 17 0.3 0.032 

22 20 0.6 1.5 IR152220 19 0.6 0.032 

20 16 0.3 1.5 IR172016 19 0.3 0.011 

20 16.5 0.3 1.5 IR172016.5 19 0.3 0.011 

20 20 0.3 1.5 IR172020 19 0.3 0.014 

20 20.5 0.3 IR172020.5 19 0.3 0.014 

20 30.5 0.3 IR172030.5 19 0.3 0.021 

21 16 0.3 1.5 IR172116 19 0.3 0.014 

21 20 0.3 IR172120 19 0.3 0.018 

22 0 13 0.3 1.5 IR172213 19 0.3 0.015 

22 

0.009 

14 0.3 IR172214D 19 0.3 0.016 

22 16 0.3 IR172216 19 0.3 0.019 

22 18 0.3 1.5 IR172218 19 0.3 0.021 

22 20.5 0.3 1.5 IR172220.5 19 0.3 0.024 

22 23 0.3 IR172223 19 0.3 0.027 

22 26 0.3 1.5 IR172226 19 0.3 0.030 

22 32 0.3 1.5 IR172232 19 0.3 0.036 

24 20 0.6 1.5 IR172420 21 0.6 0.034 

24 16 0.3 1.8 IR202416 22 0.3 0.017 

24 20 0.3 IR202420 22 0.3 0.021 

24 28.5 0.3 IR202428.5 22 0.3 0.030 

25 12.5 0.3 1.8 IR202512.5 22 0.3 0.016 

25 16 0.3 IR202516 22 0.3 0.021 

20 25 

0 

0.009 16.5 0.3 1.8 IR202516.5 22 0.3 0.022 

25 17 0.3 1.8 IR202517 22 0.3 0.022 

25 18 0.3 IR202518D 22 0.3 0.024 

25 20 0.3 IR202520 22 0.3 0.027 

25 20.5 0.3 1.8 IR202520.5 22 0.3 0.028 

25 23 0.3 1.8 IR202523 22 0.3 0.031 





B-119

Inner rings 

NTN 

Type IR 

d 

2028mm 


dimensions 

mm mm kg 


da 

ras 

20 

25 26 0.3 1.8 IR202526 22 0.3 0.034 

25 26.5 0.3 IR202526.5 22 0.3 0.036 

25 0 30 0.3 1.8 IR202530 22 0.3 0.041 

25 0.009 

32 0.3 1.8 IR202532 22 0.3 0.041 

25 38.5 0.3 IR202538.5 22 0.3 0.053 

28 20 0.6 1.8 IR202820 24 0.6 0.045 

26 16 0.3 1.8 IR222616 24 0.3 0.017 

26 20 0.3 IR222620 24 0.3 0.022 

28 17 0.3 1.8 IR222817 24 0.3 0.030 

22 28 

0 

0.009 20 0.3 1.8 IR222820 24 0.3 0.035 

28 20.5 0.3 1.8 IR222820.5 24 0.3 0.036 

28 23 0.3 1.8 IR222823 24 0.3 0.042 

28 30 0.3 IR222830 24 0.3 0.054 

29 20 0.3 IR252920 27 0.3 0.026 

29 30 0.3 1.8 IR252930 27 0.3 0.039 

30 12.5 0.3 1.8 IR253012.5 27 0.3 0.020 

30 16 0.3 1 IR253016 27 0.3 0.024 

30 16.5 0.3 1.8 IR253016.5 27 0.3 0.026 

30 17 0.3 1.8 IR253017 27 0.3 0.027 

30 18 0.3 IR253018 27 0.3 0.030 

30 

0 

0.009 20 0.3 1.8 IR253020 27 0.3 0.033 

25 30 20.5 0.3 1.8 IR253020.5 27 0.3 0.034 

30 23 0.3 1.8 IR253023 27 0.3 0.038 

30 26 0.3 1.8 IR253026 27 0.3 0.041 

30 26.5 0.3 IR253026.5 27 0.3 0.043 

30 30 0.3 1.8 IR253030 27 0.3 0.050 

30 32 0.3 1 IR253032 27 0.3 0.054 

30 38.5 0.3 IR253038.5 27 0.3 0.064 

32 0.008 22 0.6 1.8 IR253222 29 0.6 0.052 

32 

0.002 

30.5 0.6 1.8 IR253230.5 29 0.6 0.072 

28 32 

0.008 

0.002 17 0.3 1.8 IR283217 30 0.3 0.025 



Remarks: 1. Nominal number plus -mark represents inner ring with fine-chamfered outer surface. 

B-120

Inner rings 

NTN 

d 

2835mm 


dimensions 

mm mm kg 


32 20 0.3 1.8 IR283220 30 0.3 0.028 

28 32 0.008 

0.002 23 0.3 1.8 IR283223 30 0.3 0.034 

32 30 0.3 IR283230 30 0.3 0.044 

0.008 

29 32 0.002 13 0.3 1.8 IR293213 31 0.3 0.015 

35 12.5 0.3 1.8 IR303512.5 32 0.3 0.024 

35 13 0.3 1.3 IR303513 32 0.3 0.025 

35 16 0.3 IR303516 32 0.3 0.031 

35 16.5 0.3 1.8 IR303516.5 32 0.3 0.032 

35 17 0.3 1.8 IR303517 32 0.3 0.032 

35 18 0.3 IR303518D 32 0.3 0.035 

35 20 0.3 IR303520 32 0.3 0.038 

30 35 

0.008 

0.002 20.5 0.3 1.8 IR303520.5 32 0.3 0.039 

35 23 0.3 1.8 IR303523 32 0.3 0.044 

35 26 0.3 1.8 IR303526 32 0.3 0.050 

35 30 0.3 IR303530 32 0.3 0.059 

35 32 0.3 1.8 IR303532 32 0.3 0.063 

37 18 0.3 1.8 IR303718 32 0.3 0.050 

37 22 0.6 1.8 IR303722 34 0.6 0.061 

38 20 0.6 IR303820 34 0.6 0.065 

32 

37 20 0.3 2 IR323720 34 0.3 0.040 

37 30 0.3 IR323730 34 0.3 0.063 

38 0 32 0.3 2 IR323832 34 0.3 0.082 

40 

0.011 

20 0.6 2 IR324020 36 0.6 0.068 

40 27 0.6 2 IR324027 36 0.6 0.092 

40 36 0.6 2 IR324036 36 0.6 0.124 

0 

33 37 0.011 13 0.3 2 IR333713 35 0.3 0.022 

35 

40 12.5 0.3 2 IR354012.5 37 0.3 0.027 

40 0 16.5 0.3 2 IR354016.5 37 0.3 0.037 

40 

0.011 

17 0.3 2 IR354017 37 0.3 0.038 

40 20 0.3 2 IR354020 37 0.3 0.044 

da 

ras 





B-121

Inner rings 

NTN 

Type IR 

d 

3545mm 


dimensions 

mm mm kg 


da 

ras 

35 

38 

40 

42 

45 

40 20.5 0.3 2 IR354020.5 37 0.3 0.046 

40 30 0.3 IR354030 37 0.3 0.068 

40 34 0.3 1.8 IR354034 37 0.3 0.079 

40 40 0.3 2 IR354040 37 0.3 0.091 

42 0 20 0.6 1.8 IR354220 39 0.6 0.064 

42 

0.011 

21 0.6 IR354221 39 0.6 0.068 

42 23 0.6 IR354223D 39 0.6 0.074 

42 27 0.6 2 IR354227 39 0.6 0.080 

42 36 0.6 2 IR354236 39 0.6 0.117 

43 22 0.6 2 IR354322 39 0.6 0.081 

43 0 20 0.3 1.8 IR384320 40 0.3 0.048 

43 

0.011 

30 0.3 IR384330 40 0.3 0.074 

45 16.5 0.3 2 IR404516.5 42 0.3 0.042 

45 17 0.3 2 IR404517 42 0.3 0.043 

45 20 0.3 2 IR404520 42 0.3 0.051 

45 20.5 0.3 2 IR404520.5 42 0.3 0.053 

45 26.5 0.3 IR404526.5 42 0.3 0.068 

45 30 0.3 2 IR404530 42 0.3 0.077 

45 0 34 0.3 2 IR404534 42 0.3 0.088 

45 

0.011 

40 0.3 2 IR404540 42 0.3 0.106 

48 22 0.6 2 IR404822 44 0.6 0.092 

48 23 0.6 IR404823 44 0.6 0.097 

48 30 0.6 2 IR404830 44 0.6 0.123 

48 40 0.6 2 IR404840 44 0.6 0.170 

50 20 0.3 0.8 IR405020 44 0.3 0.106 

50 22 1 2 IR405022 45 1 0.118 

47 0 20 0.3 2 IR424720 44 0.3 0.053 

47 

0.011 

30 0.3 2 IR424730 44 0.3 0.080 

50 0 20 0.3 2 IR455020 47 0.3 0.057 

50 

0.011 

25 0.6 2 IR455025 49 0.6 0.071 





B-122

Inner rings 

NTN 

d 

4555mm 


dimensions 

mm mm kg 


50 25.5 0.3 IR455025.5 47 0.3 0.074 

50 0 32 0.6 IR455032 49 0.6 0.092 

50 

0.011 

35 0.6 2 IR455035 49 0.6 0.101 

50 40 0.3 1.5 IR455040 47 0.3 0.115 

52 22 0.6 2 IR455222 49 0.6 0.088 

45 52 23 0.6 IR455223D 49 0.6 0.093 

52 30 0.6 2 IR455230 49 0.6 0.123 

52 

0.008 

0.004 40 0.6 2 IR455240 49 0.6 0.164 

55 20 0.6 2 IR455520 49 0.6 0.116 

55 22 1 2 IR455522 50 1 0.130 

55 40 0.6 2 IR455540 49 0.6 0.173 

da 

ras 

50 

55 

55 20 0.6 2 IR505520 54 0.6 0.063 

55 25 0.6 2 IR505525 54 0.6 0.078 

55 35 0.6 2 IR505535 54 0.6 0.112 

55 40 0.6 2 IR505540 54 0.6 0.128 

58 22 0.6 2 IR505822 54 0.6 0.113 

58 0.008 23 0.6 IR505823D 54 0.6 0.119 

58 

0.004 

30 0.6 2 IR505830 54 0.6 0.159 

58 40 0.6 2 IR505840 54 0.6 0.209 

60 20 1 2 IR506020 55 1 0.129 

60 25 1 2 IR506025 55 1 0.163 

60 28 1.1 2 IR506028 56.5 1 0.183 

60 40 1 2 IR506040 55 1 0.262 

60 25 0.6 2.2 IR556025 59 0.6 0.086 

60 35 0.6 2 IR556035 59 0.6 0.121 

63 25 1 2 IR556325 60 1 0.141 

63 0 34 1 2.2 IR556334 60 1 0.192 

63 

0.013 

45 1 2.2 IR556345 60 1 0.256 

65 28 1.1 2.2 IR556528 61.5 1 0.206 

65 30 1 2.2 IR556530 60 1 0.220 

65 60 1 1.5 IR556560 60 1 0.440 





B-123

Inner rings 

NTN 

Type IR 

d 

6075mm 


dimensions 

mm mm kg 


da 

ras 

60 

65 

70 

75 

68 25 1 2.2 IR606825 65 1 0.152 

68 34 1 2.2 IR606834 65 1 0.206 

68 35 0.6 2.2 IR606835 64 0.6 0.213 

68 0 45 1 2.2 IR606845 65 1 0.270 

0.013 

70 25 1 2.2 IR607025 65 1 0.195 

70 28 1.1 2.2 IR607028 66.5 1 0.216 

70 30 1 2.2 IR607030 65 1 0.232 

70 60 1 2.2 IR607060 65 1 0.463 

72 25 1 2.2 IR657225 70 1 0.142 

72 34 1 2.2 IR657234 70 1 0.193 

72 45 1 2.2 IR657245 70 1 0.259 

73 0 25 0.6 2.2 IR657325 69 0.6 0.164 

73 

0.013 

35 0.6 2.2 IR657335 69 0.6 0.232 

75 28 1.1 2.2 IR657528 71.5 1 0.240 

75 30 1 2.2 IR657530 70 1 0.256 

75 60 1 2.2 IR657560 70 1 0.513 

80 25 1 2.2 IR708025 75 1 0.224 

80 28 1.1 2.2 IR708028 76.5 1 0.250 

80 30 1 2.2 IR708030 75 1 0.267 

80 0 35 1 2.2 IR708035 75 1 0.313 

80 

0.013 

40 1 2.2 IR708040 75 1 0.358 

80 54 1 2.2 IR708054 75 1 0.483 

80 56 1 2.2 IR708056 75 1 0.502 

80 60 1 2.2 IR708060 75 1 0.540 

85 25 1 2.2 IR758525 80 1 0.238 

85 30 1 2.2 IR758530 80 1 0.287 

85 0 35 1 2.2 IR758535 80 1 0.336 

85 

0.015 

40 1 2.2 IR758540 80 1 0.385 

85 54 1 2.2 IR758554 80 1 0.515 

90 32 1.1 2.2 IR759032 81.5 1 0.480 



B-124

Inner rings 

NTN 

d 

80100mm 


dimensions 

mm mm kg 


da 

ras 

80 

90 25 1 2.2 IR 80 9025 85 1 0.254 

90 30 1 2.2 IR 80 9030 85 1 0.304 

90 0 35 1 2.2 IR 80 9035 85 1 0.355 

90 

0.015 

40 1 2.2 IR 80 9040 85 1 0.408 

90 54 1 2.2 IR 80 9054 85 1 0.543 

95 32 1.1 2.2 IR 80 9532 86.5 1 0.510 

95 26 1 2.5 IR 85 9526 90 1 0.280 

95 30 1 2.5 IR 85 9530 90 1 0.323 

95 36 1 2.5 IR 85 9536 90 1 0.398 

85 100 

0 

0.015 32 1.1 2.5 IR 8510032 91.5 1 0.530 

100 35 1.1 2.5 IR 8510035 91.5 1 0.580 

100 46 1.1 2.5 IR 8510046 91.5 1 0.760 

100 63 1.1 2.5 IR 8510063 91.5 1 1.05 

100 26 1 2.5 IR 9010026 95 1 0.294 

100 30 1 2.5 IR 9010030 95 1 0.340 

100 36 1 2.5 IR 9010036 95 1 0.406 

90 105 

0 

0.015 32 1.1 2.5 IR 9010532 96.5 1 0.560 

105 35 1.1 2.5 IR 9010535 96.5 1 0.610 

105 46 1.1 2.5 IR 9010546 96.5 1 0.800 

105 63 1.1 2.5 IR 9010563 96.5 1 1.11 

95 

100 

105 26 1 2.5 IR 9510526 100 1 0.313 

105 36 1 2.5 IR 9510536 100 1 0.430 

110 0 32 1.1 2.5 IR 9511032 101.5 1 0.590 

110 

0.015 

35 1.1 2.5 IR 9511035 101.5 1 0.640 

110 46 1.1 2.5 IR 9511046 101.5 1 0.850 

110 63 1.1 2.5 IR 9511063 101.5 1 1.17 

110 30 1.1 2.5 IR10011030 106.5 1 0.375 

110 0 40 1.1 2.5 IR10011040 106.5 1 0.505 

115 0.015 

32 1.1 2.5 IR10011532 106.5 1 0.620 

115 40 1.1 2.5 IR10011540 106.5 1 0.775 



B-125

Inner rings 

NTN 

Type IR 

d 

100160mm 


dimensions 

mm mm kg 


0 

100 115 54 1.1 2.5 IR10011554 106.5 1 1.09 

0.015 

110 

120 0 30 1 2.5 IR11012030 115 1 0.440 

120 

0.015 

40 1.1 2.5 IR11012040 116.5 1 0.580 

125 0 40 1.1 2.5 IR11012540 116.5 1 0.840 

125 

0.018 

54 1.1 2.5 IR11012554 116.5 1 1.16 

130 30 1 2.2 IR12013030 125 1 0.440 

130 40 1.1 2.5 IR12013040 126.5 1 0.590 

120 135 

0 

0.018 40 2 2.5 IR12013540 129 2 0.870 

135 45 1.1 2.5 IR12013545 126.5 1 0.980 

135 60 1.1 2.5 IR12013560 126.5 1 1.25 

da 

ras 

130 

140 

145 32 1.5 3 IR13014532 138 1.5 0.780 

145 35 1.1 3 IR13014535 136.5 1 0.855 

145 0 42 1.5 3 IR13014542 138 1.5 1.05 

150 

0.018 

50 1.5 3 IR13015050 138 1.5 1.69 

150 52 2 3 IR13015052 139 2 1.75 

150 67 1.5 3 IR13015067 138 1.5 2.25 

155 32 1.5 3 IR14015532 148 1.5 0.840 

155 35 1.1 3 IR14015535 146.5 1 0.917 

155 0 42 1.5 3 IR14015542 148 1.5 1.10 

160 

0.018 

50 1.5 3 IR14016050 148 1.5 1.70 

160 52 2 3 IR14016052 149 2 1.78 

160 67 1.5 3 IR14016067 148 1.5 2.30 

165 32 1.5 3 IR15016532 158 1.5 0.900 

165 40 1.1 3 IR15016540 156.5 1 1.12 

150 165 

0.017 

0.035 42 1.5 3 IR15016542 158 1.5 1.18 

170 52 2 3 IR15017052 159 2 2.00 

170 60 2 3 IR15017060 159 2 2.35 

160 

175 0.017 40 1.1 3 IR16017540 166.5 1 1.20 

180 

0.035 

60 2 3 IR16018060 169 2 2.50 



B-126

Inner rings 

NTN 

d 

170380mm 


dimensions 

mm mm kg 


da 

ras 

170 

180 

190 

200 

220 

240 

260 

280 

300 

320 

340 

360 

380 

185 45 1.1 3 IR170185 45 176.5 1 1.45 

0.013 

190 0.043 

60 2 3 IR170190 60 179 2 2.65 

195 45 1.1 3 IR180195 45 186.5 1 1.51 

0.013 

205 0.043 

69 2 3 IR180205 69 189 2 4.10 

210 0.020 50 1.5 3.5 IR190210 50 198 1.5 2.41 

0.050 

215 69 2 3.5 IR190215 69 199 2 4.10 

220 0.020 50 1.5 3.5 IR200220 50 208 1.5 2.49 

0.050 

225 80 2.1 3.5 IR200225 80 211 2 5.10 

240 0.033 50 1.5 3.5 IR220240 50 228 1.5 2.75 

0.063 

245 80 2.1 3.5 IR220245 80 231 2 5.70 

265 0.037 60 2 3.5 IR240265 60 249 2 4.60 

0.069 

265 80 2.1 3.5 IR240265 80 251 2 6.30 

285 0.064 60 2 4 IR260285 60 269 2 4.98 

0.092 

290 100 2.1 4 IR260290100 271 2 10.0 

305 0.064 69 2 4 IR280305 69 289 2 6.20 

0.092 

310 100 2.1 4 IR280310100 291 2 10.8 

330 0.062 80 2.1 4 IR300330 80 311 2 9.30 

0.098 

340 118 3 4 IR300340118 313 2.5 18.5 

350 0.062 80 2.1 5 IR320350 80 331 2 9.80 

0.098 

360 118 3 5 IR320360118 333 2.5 20.0 

370 0.062 80 2.1 5 IR340370 80 351 2 10.1 

0.098 

380 118 3 5 IR340380118 353 2.5 22.0 

390 0.090 80 2.1 5 IR360390 80 371 2 10.9 

0.126 

400 118 3 5 IR360400118 373 2.5 22.0 

415 0.080 100 2.1 5 IR380415100 391 2 18.5 

0.120 

430 140 4 5 IR380430140 396 3 35.0 



B-127

Inner rings 

NTN 

Type IR 

d 

400440mm 


dimensions 

mm mm kg 


400 450 0.080 

0.120 140 4 5 IR400450140 416 3 36.5 

420 470 

0.105 

0.145 140 4 5 IR420470140 436 3 38.2 

440 490 

0.105 

0.145 160 4 5 IR440490160 456 3 46.5 

da 

ras 



B-128

Inner rings 

NTN 

Inch series 

Type MI 

d 

z9.52534.925mm 


dimensions 

mm (!/25.4mm) mm kg 


14.288((/16) 12.95 0.6 MI-060908 13.5 0.6 0.013 

9.525(#/8) 15.875(%/8) 

0 

0.008 19.30 0.6 1 MI-061012 13.5 0.6 0.019 

15.875(%/8) 25.65 0.6 1 MI-061016 13.5 0.6 0.025 

19.050(#/4) 16.13 1 MI-081210 17.5 1 0.020 

12.700(!/2) 19.050(#/4) 

0 

0.009 19.30 1 MI-081212 17.5 1 0.024 

19.050(#/4) 25.65 1 MI-081216 17.5 1 0.032 

da 

ras 

15.875(%/8) 

19.050(#/4) 

22.225(&/8) 

22.225(&/8) 9.78 1 MI-101406 21 1 0.014 

22.225(&/8) 0 12.95 1 MI-101408 21 1 0.018 

22.225(&/8) 0.009 19.30 1 MI-101412 21 1 0.027 

22.225(&/8) 25.65 1 MI-101416 21 1 0.036 

25.400(1) 0 19.30 1 MI-121612 24 1 0.034 

25.400(1) 

0.009 

25.65 1 MI-121616 24 1 0.045 

28.575(1 !/8) 12.95 1 MI-141808 27 1 0.027 

28.575(1 !/8) 

0 

19.30 1 MI-141812 27 1 0.040 

28.575(1 !/8) 

0.009 25.65 1 MI-141816 27 1 0.052 

28.575(1 !/8) 32.00 1 MI-141820 27 1 0.066 

31.750(1 !/4) 19.30 1 MI-162012 30.5 1 0.039 

25.400(1) 

0.008 

31.750(1 !/4) 0.002 25.65 1 MI-162016 30.5 1 0.052 

31.750(1 !/4) 32.00 1 MI-162020 30.5 1 0.065 

34.925(1 #/8) 12.95 1 MI-182208 33.5 1 0.032 

28.575(1 !/8) 

0.008 

34.925(1 #/8) 

0.002 25.65 1 MI-182216 33.5 1 0.063 

34.925(1 #/8) 32.00 1 MI-182220 33.5 1 0.079 

31.750(1 !/4) 

33.338(1 %/16) 

34.925(1 #/8) 

38.100(1 !/2) 

0 25.65 1.5 MI-202416 37 1.5 0.075 

38.100(1 !/2) 

0.011 

32.00 1.5 MI-202420 37 1.5 0.094 

41.275(1 %/8) 

0 25.65 1.5 2 MI-212616 40 1.5 0.093 

41.275(1 %/8) 

0.011 

32.00 1.5 2 MI-212620 40 1.5 0.116 

41.275(1 %/8) 

0 16.13 1.5 2 MI-222610 40 1.5 0.073 

0.011 

44.450(1 #/4) 25.65 1.5 2 MI-222816 41.5 1.5 0.117 



Remarks: 1. Nominal number plus -mark represents inner ring with fine-chamfered outer surface. r 

B-129

Inner rings 

NTN 

Inch series 

Type MI 

d 

34.92598.425mm 


dimensions 



0 

34.925(1 #/8) 44.450(1 #/4) 32.00 1.5 2 MI-222820 41.5 1.5 0.146 

0.011 

44.450(1 #/4) 0 19.30 1.5 2 MI-242812 43 1.5 0.062 

38.100(1 !/2) 

0.011 

44.450(1 #/4) 25.65 1.5 2 MI-242816 43 1.5 0.083 

0 

39.688(1 (/16) 47.625(1 &/8) 

0.011 32.00 1.5 2 MI-253020 46 1.5 0.136 

41.275(1 %/8) 

50.800(2) 0.008 25.65 1.5 2 MI-263216 48 1.5 0.140 

50.800(2) 

0.004 

32.00 1.5 2 MI-263220 48 1.5 0.175 

da 

ras 

44.450(1 #/4) 

50.800(2) 

57.150(2 !/4) 0.008 38.35 1.5 2 MI-283624 51 1.5 0.310 

0.004 

57.150(2 !/4) 44.70 1.5 2 MI-283628 51 1.5 0.360 

63.500(2 !/2) 0 38.35 2 2 MI-324024 59 2 0.340 

0.013 

63.500(2 !/2) 44.70 2 2 MI-324028 59 2 0.420 

69.850(2 #/4) 25.65 2 2.2 MI-364416 65 2 0.257 

57.150(2 !/4) 

0 

69.850(2 #/4) 0.013 38.35 2 2.2 MI-364424 65 2 0.384 

69.850(2 #/4) 44.70 2 2.2 MI-364428 65 2 0.447 

63.500(2 !/2) 

76.200(3) 0 38.35 2 2.2 MI-404824 71.5 2 0.417 

76.200(3) 

0.013 

44.70 2 2.2 MI-404828 71.5 2 0.486 

66.675(2 %/8) 

82.550(3 !/4) 0 44.70 2 2.2 MI-425228 74.5 2 0.648 

0.015 

82.550(3 !/4) 51.05 2 2.2 MI-425232 74.5 2 0.740 

69.850(2 #/4) 

0 

82.550(3 !/4) 0.015 44.70 2 2.2 MI-445228 78 2 0.530 

76.200(3) 

88.900(3 !/2) 0 44.70 2 2.2 MI-485628 84 2 0.574 

0.015 

88.900(3 !/2) 51.05 2 2.2 MI-485632 84 2 0.655 

79.375(3 !/8) 

0 

95.250(3 #/4) 0.015 51.05 2.5 2.2 MI-506032 88.5 2.5 0.862 

85.725(3 #/8) 101.600(4) 

0 

0.015 51.05 2.5 2.5 MI-546432 94.5 2.5 0.930 

92.075(3 %/8) 

0 

107.950(4 !/4) 0.015 51.05 2.5 2.5 MI-586832 101 2.5 1.00 

95.250(3 #/4) 

0 

114.300(4 !/2) 0.015 57.40 2.5 2.5 MI-607236 104 2.5 1.40 

98.425(3 &/8) 

114.300(4 !/2) 

0 57.40 2.5 2.5 MI-627236 107.5 2.5 1.15 

114.300(4 !/2) 

0.015 

63.88 2.5 2.5 MI-627240 107.5 2.5 1.28 



B-130

Inner rings 

NTN 

d 

101.600203.200mm 


dimensions 



127.000(5) 51.05 2.5 2.5 MI-648032 110.5 2.5 1.82 

101.600(4) 127.000(5) 

0 

0.018 57.40 2.5 2.5 MI-648036 110.5 2.5 2.05 

127.000(5) 63.88 2.5 2.5 MI-648040 110.5 2.5 2.28 

139.700(5 !/2) 0 63.88 2.5 2.5 MI-728840 123.5 2.5 2.58 

114.300(4 !/2) 

0.018 

139.700(5 !/2) 76.58 2.5 2.5 MI-728848 123.5 2.5 3.10 

0 

120.650(4 #/4) 146.050(5 #/4) 0.018 76.58 3 3 MI-769248 132 3 3.18 

127.000(5) 

152.400(6) 0 63.88 3 3 MI-809640 140 3 2.80 

152.400(6) 

0.018 

76.58 3 3 MI-809648 140 3 3.35 

139.700(5 !/2) 

165.100(6 !/2) 0.010 63.88 3 3 MI-8810440 152.5 3 2.84 

0.028 

165.100(6 !/2) 76.58 3 3 MI-8810448 152.5 3 3.40 

152.400(6) 

0.013 

184.150(7 !/4) 0.033 76.58 3 3 MI-9611648 165.5 3 4.80 

165.100(6 !/2) 

0.013 

196.850(7 #/4) 0.043 76.58 3 3 MI-10412448 178 3 5.30 

177.800(7) 

0.013 

209.550(8 !/4) 0.043 76.58 3 3 MI-11213248 191 3 5.60 

190.500(7 !/2) 

0.020 

222.250(8 #/4) 0.050 76.58 4 3 MI-12014048 206.5 4 6.10 

203.200(8) 

0.033 

234.950(9 !/4) 0.063 76.58 4 3.5 MI-12814848 219 4 6.50 

da 

ras 



B-131

B-132

Adjustable-Clearance Needle Roller Bearings


NTN 

Clearance-Adjustable Needle Roller Bearings 

This bearing type comprises a solid outer ring with 

special machined section and needle rollers and cage 

built in the outer ring. The outer ring, needle rollers and 

cage are inseparable from each other. The raceway 

diameter of the outer ring is shrunk and the roller 

inscribed circle diameter (Fw) is reduced correspondingly 

by pressing the outer ring in axial direction. 

The radial clearance is fine-adjustable by an load to be 

applied to the bearing in axial direction, that is, axial 

shrinkage of the outer ring. This bearing type is mainly 

applied to the work spindle of a machine tool etc. which 

require high running accuracy, whose accuracy class is 

JIS Class-4. 

Bearing type 

Applied shaft 

diameter (mm) 



Remarks 

Type RNA49S 

30125 

RNA 49 05 S 

Type NA49S 

25110 

Type code 


Bore diameter number 

Tail code 

[Tail code] 

S: Clearance-adjustable type 

The dimensional accuracy, profile 

accuracy and running accuracy 

conform to JIS Class-4 so as to be 

available for applications requiring 

high running accuracy. 

Another inner ring type with 

grinding allowance for its raceway 

surface can also be supplied upon 

request. 

Bearing accuracy 

Application of this bearing type is limited to the portions 

of a machine which require high running accuracy. 

Therefore, the dimensional accuracy, profile accuracy 

and running accuracy of this bearing type conform to JIS 

Class-4. Higher running accuracy can be achieved by 

finishing the inner ring raceway surface with grinding 

allowance by grinding, after the inner ring was press-fitted 

on a shaft. Feel free to contact NTN for the more detailed 

information. 


The Type NA49S with inner ring has a radial 

clearance smaller than the specific ordinary clearance, 

while the radial clearance of Type RNA49S without 

inner ring is determined by shaft diameter being selected 

per applicable "Dimensions Table" which specifies the 

dimensional tolerances for the roller inscribed circle 

diameter (Fw). 

The outer ring must be fitted in a housing by "close fit" 

or "tight fit" (interference of approximately 5m) to shrink 

the raceway diameter by pressing the outer ring in axial 

direction. 

Bearing fit on a shaft and in a housing shall be per 

Table 1. 

Table 1 Bearing fit in shaft and housing 

Bearing type 

RNA49S 

NA49S 

Shaft 

m5 

k5 

Shaft and housing accuracy 

Housing 

This bearing type which is applied to the portions of a 

machine requiring high running accuracy is clamped with 

the outer ring inclination in installing restrained as less as 

possible. Therefore, the profile accuracy of the shaft and 

the housing must be made higher than that for general 

machined ring needle roller bearings. (Table 2) 

Table 2 Shaft and housing accuracy 




Shoulder perpendicularity (max) 

K4 

Shaft 

IT2 

IT2 

IT3 

Housing 

IT3 

IT3 

IT3 

B-134


NTN 

How to adjust radial clearance 

The ratio of outer ring axial shrinkage to shrinkage of 

roller inscribed circle diameter (Fw) is nearly 3:1. In other 

words, the outer ring must be tightened by 3 mm in axial 

direction to make the radial clearance smaller by 1 mm. 

For adjustment of the radial clearance, the outer ring 

must be tightened uniformly in parallel to the shaft center. 

In the case of adjustment by the method illustrated in 

Fig.1, a specific axial tightening value can be obtained by 

changing the thickness of a spacer, which was inserted 

between the housing and the lid, by lapping the spacer or 

replacing it with another spacer. In the case of 

adjustment by the method illustrated in Fig.2, the fixed 

ring 2 is fitted in the housing and, thereafter, the threaded 

lid 1 is screwed in until it comes in contact with the outer 

ring for zero setting. Then, the threaded lid 1 is further 

screwed in by the required value, after the fixed ring was 

loosened, and thereafter the fixed ring 2 is retightened. 

Further, it is recommended to use a saw-toothed 

tightening screw as illustrated in Fig. 3 because 

accuracy-down can be minimized by use of such a screw. 

Fig. 2 

2 

1 

47˚ 

Fig. 3 

Fig. 1 

B-135


NTN 


Type RNA49S 

FW 

30125mm 





Fw D B rs min 1) Cr Cor Cr Cor max max (approx.) 

30 

+0.031 

+0.022 42 17 0.3 12 300 16 000 1 260 1 630 8 700 13 000 RNA 4905S 36 0.3 0.070 

35 

+0.038 

+0.028 47 17 0.3 14 900 21 600 1 520 2 200 7 300 11 000 RNA 4906S 41 0.3 0.086 

40 

+0.038 

+0.028 52 20 0.6 17 600 27 800 1 790 2 830 6 700 10 000 RNA49/32S 46 0.6 0.088 

42 

+0.038 

+0.028 55 20 0.6 18 300 29 800 1 870 3 050 6 300 9 500 RNA 4907S 48 0.6 0.099 

48 

+0.038 

+0.028 62 22 0.6 22 500 40 500 2 300 4 150 5 700 8 500 RNA 4908S 54 0.6 0.134 

52 

+0.045 

+0.035 68 22 0.6 23 100 43 500 2 360 4 400 5 000 7 500 RNA 4909S 58 0.6 0.168 

58 

+0.045 

+0.035 72 22 0.6 24 700 49 000 2 520 5 000 4 700 7 000 RNA 4910S 64 0.6 0.189 

63 

+0.045 

+0.035 80 25 1 33 000 65 500 3 350 6 650 4 300 6 500 RNA 4911S 70 1 0.212 

68 

+0.045 

+0.035 85 25 1 34 000 69 000 3 450 7 050 4 000 6 000 RNA 4912S 75 1 0.257 

72 

+0.045 

+0.035 90 25 1 34 000 70 500 3 450 7 200 3 700 5 500 RNA 4913S 79 1 0.286 

80 

+0.045 

+0.035 100 30 1 44 500 94 000 4 550 9 600 3 300 5 000 RNA 4914S 88 1 0.422 

85 

+0.055 

+0.040 105 30 1 45 500 99 000 4 650 10 100 3 100 4 700 RNA 4915S 93 1 0.451 

90 

+0.055 

+0.040 110 30 1 46 500 104 000 4 750 10 600 2 900 4 400 RNA 4916S 98 1 0.468 

100 

+0.055 

+0.040 120 35 1.1 57 000 140 000 5 800 14 300 2 700 4 000 RNA 4917S 108 1 0.594 

105 

+0.055 

+0.040 125 35 1.1 58 500 146 000 5 950 14 900 2 500 3 800 RNA 4918S 113 1 0.617 

110 

+0.055 

+0.040 130 35 1.1 59 500 152 000 6 050 15 500 2 400 3 600 RNA 4919S 118 1 0.735 

115 

+0.055 

+0.040 140 40 1.1 72 000 168 000 7 350 17 100 2 300 3 500 RNA 4920S 125 1 0.980 

125 

+0.065 

+0.050 150 40 1.1 75 500 184 000 7 700 18 800 2 100 3 200 RNA 4922S 135 1 1.04 


B-136


NTN 


Type NA49S 

d 

25110mm 

Boundary dimensions Basic load ratings Limiting Bearing Bearing Abutment Mass 

dynamic static dynamic static speeds numbers clearanc dimensions 

before 


installation mm 

kg 

grease oil 

da Da ras 

d D B rs min 1) F Cr Cor Cr Cor m min max max (approx.) 

25 42 17 0.3 30 12 300 16 000 1 260 1 630 8 700 13 000 NA 4905S 1025 27 36 0.3 0.084 

30 47 17 0.3 35 14 900 21 600 1 520 2 200 7 300 11 000 NA 4906S 1225 32 41 0.3 0.099 

32 52 20 0.6 40 17 600 27 800 1 790 2 830 6 700 10 000 NA49/32S 1225 36 46 0.6 0.157 

35 55 20 0.6 42 18 300 29 800 1 870 3 050 6 300 9 500 NA 4907S 1530 39 48 0.6 0.164 

40 62 22 0.6 48 22 500 40 500 2 300 4 150 5 700 8 500 NA 4908S 1530 44 54 0.6 0.227 

45 68 22 0.6 52 23 100 43 500 2 360 4 400 5 000 7 500 NA 4909S 1535 49 58 0.6 0.257 

50 72 22 0.6 58 24 700 49 000 2 520 5 000 4 700 7 000 NA 4910S 1535 54 64 0.6 0.271 

55 80 25 1 63 33 000 65 500 3 350 6 650 4 300 6 500 NA 4911S 1535 60 70 1 0.382 

60 85 25 1 68 34 000 69 000 3 450 7 050 4 000 6 000 NA 4912S 2040 65 75 1 0.410 

65 90 25 1 72 34 000 70 500 3 450 7 200 3 700 5 500 NA 4913S 2040 70 79 1 0.427 

70 100 30 1 80 44 500 94 000 4 550 9 600 3 300 5 000 NA 4914S 2040 75 88 1 0.689 

75 105 30 1 85 45 500 99 000 4 650 10 100 3 100 4 700 NA 4915S 2545 80 93 1 0.740 

80 110 30 1 90 46 500 104 000 4 750 10 600 2 900 4 400 NA 4916S 2545 85 98 1 0.774 

85 120 35 1.1 100 57 000 140 000 5 800 14 300 2 700 4 000 NA 4917S 2545 91.5 108 1 1.18 

90 125 35 1.1 105 58 500 146 000 5 950 14 900 2 500 3 800 NA 4918S 2550 96.5 113 1 1.23 

95 130 35 1.1 110 59 500 152 000 6 050 15 500 2 400 3 600 NA 4919S 2550 101.5 118 1 1.40 

100 140 40 1.1 115 72 000 168 000 7 350 17 100 2 300 3 500 NA 4920S 2550 106.5 125 1 1.91 

110 150 40 1.1 125 75 500 184 000 7 700 18 800 2 100 3 200 NA 4922S 3060 116.5 135 1 2.12 


B-137

B-138

Complex Bearings


NTN 

Complex Bearings 

NTN complex bearing is composed of a radial needle 

roller bearing to support radial load and a thrust ball 

bearing or a thrust roller bearing to support axial load 

which are integrated into one bearing unit. Comparing 

with individual use of a radial bearing and a thrust bearing 

for the same purpose, this complex bearing saves the 

required installation space and thereby can contribute to 

making the overall construction of an equipment more 

compact. 

Bearing type 

Applied shaft 

diameter (mm) 

Load capacity 



Type NKX 

NKX 20 T2 

Tail code 



(shaft diameter) 

Type NKXZ 

1070 

Cr 

Ca 

NKX 20 T2 Z 

Type code 

Tail code 


Z: with dust-proof cover 



Type code 

Type NKXR 

NKXR 20 T2 

Tail code 




Type NKXRZ 

1550 

Cr 

Ca 

Type code 

NKXR 20 T2Z 

Tail code 


Z: with dust-proof cover 



Type code 

Type NKIA 

1570 

Cr 

Ca 

NKIA 59 04 

Bore diameter code 

Dimension series code 

Type code 

Type NKIB 

NKIB 59 04 R 

1570 

Cr 

Ca 

Tail code 

R: outer ring with rib 



Type code 

Type AXN 

AXN 20 52 

2050 

Cr 

Ca 



Type code 

Type ARN 

ARN 20 62 

2070 

Cr 

Ca 



Type code 

Each listed load capacity is subject to reference bearing bore diameter of 20. 

B-140


NTN 

Bearing components Handling characteristic Features 


(shaft dia.) 

: 20 

Radial bearing : Needle roller type 

Iron cage 

Thrust bearing : Ball type 

Resin cage 

Dust-proof cover : without 

Thrust plate : Separable 


(shaft dia.) : 20 


Iron cage 


Resin cage 

Dust-proof cover : with 

Thrust plate : Non-separable, 

integral type 




Iron cage 


Resin cage 

Dust-proof cover : without 

Thrust plate : Separable 




Iron cage 


Resin cage 

Dust-proof cover : with 

Thrust plate : Non-separable, 

integral type 

 

Separable thrust plate 

Without dust-proof cover 

 

Integral thrust plate 

With dust-proof cover 

 

Separable thrust plate 

Without dust-proof cover 

 

Integral thrust plate 

With dust-proof cover 

Can be applied to high speed running under light axial load, 

due to use of ball type thrust bearing. 

This type is identical to NKZ, but its thrust bearing is 

provided with dust-proof cover to prevent grease scattering. 

Furthermore, the handling characteristic is good because 

the dust-proof cover makes the thrust plate non-separable 

integral. 

Due to the use of needle roller bearing as its thrust bearing, 

this type can support greater axial load than NKX. 

This type is identical to NKXR, but its thrust bearing is 

provided with dust-proof cover to prevent grease scattering. 

Furthermore, the handling characteristic is good because 

the dust-proof cover makes the thrust plate non-separable 

and integral. 




Thrust bearing : Angular type 

 

Integral angular bearing 

Inner ring separable 

This type is composed of needle roller bearing and angular 

bearing which were integrated into one unit. The angular 

bearing supports axial load. Hence, this type can support 

one-way axial load only. Best-suited to high speed and light 

load application. 




Outer ring with rib 

Thrust bearing : Three-point contact 

angular type 

 

Double inner ring type 

Inner ring separable 

This type is composed of needle roller bearing and 

three-point contact angular bearing which were integrated 

into one unit. Unlike KN1A, this type can support 

bi-directional axial load. 


(shaft dia.) 

: 20 

Outer ring outer diameter : 52 


Thrust bearing : Needle roller type 

 

Separable 

This type is a special-purposed bearing to support a 

precision ball screw. This type uses the side face of the 

radial bearing as the raceway surface of thrust bearing. 

This can support axial load from both directions. 


(shaft dia.) 

: 20 

Outer ring outer diameter : 62 


Thrust bearing : Cylindrical roller type 

 

Separable 

This type is a special-purposed bearing to support a 

precision ball screw. This can support bi-directional axial 

load. This type is identical to AXN, but its axial load capacity 

is greater. 

B-141


NTN 


Regarding the dimensional tolerances for radial needle 

roller bearing, refer to Table 4.3 of 4. "Bearing 

Tolerances" (page A-26) for others than the 

characteristics described in Dimensions Table and to 

Table 4.4 (page A-26) for thrust bearing tolerances 

respectively. Manufacture of bearing Type AXN and 

ARN is limited to those of JIS accuracy class-5 and -4 

only. (Allowable radial run-out values for Type AXN and 

ARN is as specified in Table 1.) 

Calculation of rated life 

The rated life (L) of any complex bearing is determined 

as follows. Determine individually the rated life (Lr) of 

radial needle roller bearing from radial load acting thereon 

and the rated life (La) of thrust bearing from axial load 

acting thereon. And determine the rated life (L) from 

these determined rated lives (Lr, La) using the following 

formula 

Table 1 Allowable radial run-out values for Type AXN and ARN 

Unit: m 

Nominal bearing bore dia. d or 

nominal bearing outer dia. D 

(mm) 

Over Incl. 

18 

30 

50 

80 

120 

30 

50 

80 

120 

150 

1 To be determined based on “d”. 

2 To be determined based on “D”. 

Radial runout of 1 

radial inner ring 

Kia 

Class 5 Class 4 

4 3 

5 4 

5 4 

 

 

Allowable radial 2 

run-out for outer ring 

Kea 

Class 5 Class 4 

 

 

8 

10 

11 

 

 

5 

6 

7 

Life La of thrust bearing 

Rated life L of complex bearing 

Life Lr of radial bearing 


The respective radial clearances of Type NKX+IR, 

NKXR+IR, NKIA and NKIB shall comply with the 

interchangeable clearances specified in Table 5.1 (1) of 

5.1 "Radial Clearances of Bearings" (page A-30). The 

standard bearings are manufactured subject to the 

regular clearances. 

The radial clearances of Type AXN and ARN is special 

clearance, as specified in applicable Dimensions Table. 

1 

L⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(1) 

1 1 0.91 

() 

Lr 1.1 La 1.1 

Bearing fits 

Radial needle roller bearings shall be fitted on shaft/in 

housing in compliance with Table 2. The thrust bearing 

washers of Type NKX and NKXR shall be fitted in a 

housing with hole diameter larger by 0.5mm or over than 

the washer outer diameter D1 or D2. For Type NKIA and 

NKIB it is not allowed to make the interference greater 

than k5/M6. 

Table 2 Bearing fit on shaft and in housing 

Bearing type Shaft Housing 

Series NKX, NKXR 

Series NKIA, NKIB 

Series AXN, ARN 

k5 

k5 

j5 

K6 (M6) 

M6 

J6 

Remarks: The parenthesized housing code is applied, 

where high rigidity is required. 

B-142


NTN 

B-143

Needle roller bearings with thrust ball bearings 

NTN 


Type NKX 

Type NKXZ 

Type NKX 

(Open type) 

Type NKXZ 

(With cover) 

FW 

1070mm 




mm N kgf 

Fw dw D D1 D2 C C1 C2 a rs min 1) Radial 

–0 –0 

–0.25 –0.20 

Cr Cor Cr Cor 

+0.022 

+0.040 

10 +0.013 10 +0.025 19 24 25 23 9 6.5 19.7 0.3 5 450 6 450 555 660 

12 +0.027 

+0.016 12 +0.050 

+0.032 21 26 27 23 9 6.5 21.7 0.3 6 000 7 700 615 785 

15 +0.027 

+0.016 15 +0.050 

+0.032 24 28 29 23 9 6.5 23.7 0.3 8 250 10 200 840 1 040 

17 +0.027 

+0.016 17 +0.050 

+0.032 26 30 31 25 9 8 25.7 0.3 10 400 14 400 1 060 1 460 

20 +0.033 

+0.020 20 +0.061 

+0.040 30 35 36 30 10 10.5 30.7 0.3 16 400 27 100 1 670 2 760 

25 +0.033 

+0.020 25 +0.061 

+0.040 37 42 43 30 11 9.5 37.7 0.6 14 200 24 000 1 450 2 450 

30 +0.033 

+0.020 30 +0.061 

+0.040 42 47 48 30 11 9.5 42.7 0.6 22 300 39 500 2 280 4 000 

35 +0.041 

+0.025 35 +0.075 

+0.050 47 52 53 30 12 9 47.7 0.6 20 000 36 000 2 040 3 650 

40 +0.041 

+0.025 40 +0.075 

+0.050 52 60 61 32 13 10 55.7 0.6 25 900 52 500 2 650 5 350 

45 +0.041 

+0.025 45 +0.075 

+0.050 58 65 66.5 32 14 9 60.5 0.6 27 600 59 000 2 810 6 000 

50 +0.041 

+0.025 50 +0.075 

+0.050 62 70 71.5 35 14 10 65.5 0.6 27 900 62 000 2 850 6 300 

60 +0.049 

+0.030 60 +0.090 

+0.060 72 85 86.5 40 17 12 80.5 1 29 800 71 500 3 050 7 300 

70 +0.049 

+0.030 70 +0.090 

+0.060 85 95 96.5 40 18 11 90.5 1 36 500 86 000 3 700 8 750 


B-144


NTN 

Basic load ratings Limiting Bearing numbers Abutment Mass 

dynamic static dynamic static dimensions dimensions (approx.) 

N kgf r/min mm kg 

Axial grease oil Type NKX NKXZ Type Da da ras Type NKX NKXZ Type 

Ca Cr Coa Cor Ca Cr Coa Cor grease oil NKX NKXZ max min max NKX(approx.) 

NKXZ 

10 000 14 000 1 020 1 420 6 700 9 500 NKX10T2 NKX10T2Z 18 0.3 0.037 0.039 

10 300 15 400 1 050 1 570 6 400 9 200 NKX12T2 NKX12T2Z 20 0.3 0.042 0.044 

10 500 16 800 1 070 1 710 6 200 8 800 NKX15T2 NKX15T2Z 23 0.3 0.044 0.048 

10 800 18 200 1 100 1 850 6 000 8 500 NKX17T2 NKX17T2Z 25 0.3 0.051 0.056 

14 200 24 700 1 450 2 520 5 200 7 500 NKX20T2 NKX20T2Z 29 0.3 0.085 0.090 

19 600 37 000 1 990 3 800 4 600 6 500 NKX25T2 NKX25T2Z 35 0.6 0.125 0.132 

20 400 42 000 2 080 4 300 4 300 6 200 NKX30T2 NKX30T2Z 40 0.6 0.140 0.148 

20 400 44 500 2 080 4 550 3 900 5 600 NKX35T2 NKX35T2Z 45 0.6 0.167 0.175 

26 900 63 000 2 740 6 400 3 500 5 000 NKX40 NKX40Z 52 0.6 0.216 0.225 

27 900 69 000 2 840 7 050 3 200 4 600 NKX45 NKX45Z 57 0.6 0.252 0.265 

28 800 75 500 2 930 7 700 3 100 4 500 NKX50 NKX50Z 62 0.6 0.302 0.318 

41 500 113 000 4 200 11 500 2 600 3 700 NKX60 NKX60Z 75 1 0.465 0.484 

43 000 127 000 4 400 12 900 2 400 3 400 NKX70 NKX70Z 85 1 0.612 0.635 

B-145


NTN 


Type NKXIR 

Type NKXZIR 

Type NKXIR 

(Open type) 

Type NKXZIR 

(With cover) 

d 

760mm 



dynamic static dynamic static dynamic static dynamic static 

N kgf N kgf 

d dw D D1 D2 B C C1 C2 F a rs min 1) r1s min 1) Radial Axial 

–0 

–0.25 –0 

–0.20 

Cr Cor Cr Cor Ca Coa Ca Coa 

+0.040 

7 10 +0.025 19 24 25 16 23 9 6.5 10 19.7 0.3 0.3 5 450 6 450 555 660 10 000 14 000 1 020 1 420 

9 

+0.050 

12 +0.032 21 26 27 16 23 9 6.5 12 21.7 0.3 0.3 6 000 7 700 615 785 10 300 15 400 1 050 1 570 

12 

+0.050 

15 +0.032 24 28 29 16 23 9 6.5 15 23.7 0.3 0.3 8 250 10 200 840 1 040 10 500 16 800 1 070 1 710 

14 

+0.050 

17 +0.032 26 30 31 17 25 9 8 17 25.7 0.3 0.3 10 400 14 400 1 060 1 460 10 800 18 200 1 100 1 850 

17 

+0.061 

20 +0.040 30 35 36 20 30 10 10.5 20 30.7 0.3 0.3 16 400 27 100 1 670 2 760 14 200 24 700 1 450 2 520 

20 

+0.061 

25 +0.040 37 42 43 20 30 11 9.5 25 37.7 0.6 0.3 14 200 24 000 1 450 2 450 19 600 37 000 1 990 3 800 

25 

+0.061 

30 +0.040 42 47 48 20 30 11 9.5 30 42.7 0.6 0.3 22 300 39 500 2 280 4 000 20 400 42 000 2 080 4 300 

30 

+0.075 

35 +0.050 47 52 53 20 30 12 9 35 47.7 0.6 0.3 20 000 36 000 2 040 3 650 20 400 44 500 2 080 4 550 

35 

+0.075 

40 +0.050 52 60 61 20 32 13 10 40 55.7 0.6 0.3 25 900 52 500 2 650 5 350 26 900 63 000 2 740 6 400 

40 

+0.075 

45 +0.050 58 65 66.5 20 32 14 9 45 60.5 0.6 0.3 27 600 59 000 2 810 6 000 27 900 69 000 2 840 7 050 

45 

+0.075 

50 +0.050 62 70 71.5 25 35 14 10 50 65.5 0.6 0.6 27 900 62 000 2 850 6 300 28 800 75 500 2 930 7 700 

50 

+0.090 

60 +0.060 72 85 86.5 25 40 17 12 60 80.5 1 1 29 800 71 500 3 050 7 300 41 500 113 000 4 200 11 500 

60 

+0.090 

70 +0.060 85 95 96.5 25 40 18 11 70 90.5 1 1 36 500 86 000 3 700 8 750 43 000 127 000 4 400 12 900 


Remarks: Nominal code number of inner ring comprises IR. Bore diameterouter diameterwidth. 

B-146


NTN 

Limiting Bearing numbers Abutment Mass 

dimensions dimensions (approx.) 

r/min mm kg 

grease oil da db ras r1as Type Type 

Type NKXIR Type NKXZIR min min max max NKXIR NKXZIR 

6 700 9 500 NKX10T2IR 71016 NKX10T2ZIR 71016 18 9 0.3 0.3 0.042 0.044 

6 400 9 200 NKX12T2IR 91216 NKX12T2ZIR 91216 20 11 0.3 0.3 0.048 0.050 

6 200 8 800 NKX15T2IR121516 NKX15T2ZIR121516 23 14 0.3 0.3 0.052 0.056 






3 500 5 000 NKX40 IR354020 NKX40Z IR354020 52 37 0.6 0.3 0.260 0.269 

3 200 4 600 NKX45 IR404520 NKX45Z IR404520 57 42 0.6 0.3 0.293 0.316 

3 100 4 500 NKX50 IR455025 NKX50Z IR455025 62 48 0.6 0.6 0.373 0.389 

2 600 3 700 NKX60 IR506025 NKX60Z IR506025 75 55 1 1 0.635 0.654 

2 400 3 400 NKX70 IR607025 NKX70Z IR607025 85 65 1 1 0.814 0.837 

B-147

Needle roller bearings with thrust cylindrical roller bearings 

NTN 


Type NKXR 

Type NKXRZ 

Type NKXR 

(Open type) 

Type NKXRZ 

(With cover) 

FW 

1550mm 




mm N kgf 

Fw dw D D1 D2 C C1 C2 a rs min 1) Radial 

–0 –0 

–0.25 –0.20 

Cr Cor Cr Cor 

+0.027 +0.050 

15 +0.016 15 +0.032 24 28 29 23 9 6.5 23.7 0.3 8 250 10 200 840 1 040 

17 

+0.027 

+0.016 17 

+0.050 

+0.032 26 30 31 25 9 8 25.7 0.3 10 400 14 400 1 060 1 460 

20 

+0.033 

+0.020 20 

+0.061 

+0.040 30 35 36 30 10 10.5 30.7 0.3 16 400 27 100 1 670 2 760 

25 

+0.033 

+0.020 25 

+0.061 

+0.040 37 42 43 30 11 9.5 37.7 0.6 14 200 24 000 1 450 2 450 

30 

+0.033 

+0.020 30 

+0.061 

+0.040 42 47 48 30 11 9.5 42.7 0.6 22 300 39 500 2 280 4 000 

35 

+0.041 

+0.025 35 

+0.075 

+0.050 47 52 53 30 12 9 47.7 0.6 20 000 36 000 2 040 3 650 

40 

+0.041 

+0.025 40 

+0.075 

+0.050 52 60 61 32 13 10 55.7 0.6 25 900 52 500 2 650 5 350 

45 

+0.041 

+0.025 45 

+0.075 

+0.050 58 65 66.5 32 14 9 60.5 0.6 27 600 59 000 2 810 6 000 

50 

+0.041 

+0.025 50 

+0.075 

+0.050 62 70 71.5 35 14 10 65.5 0.6 27 900 62 000 2 850 6 300 


B-148


NTN 

Basic load ratings Limiting Bearing numbers Abutment Mass 

dynamic static dynamic static dimensions dimensions (approx.) 

N kgf r/min mm kg 

Axial grease oil da ras Type Type 

Ca Coa Ca Coa Type NKXR Type NKXRZ min max NKXR NKXRZ 

12 900 28 600 1 310 2 920 2 800 11 000 NKXR15T2 NKXR15T2Z 25 0.3 0.048 0.052 

13 400 31 000 1 370 3 150 2 500 10 000 NKXR17T2 NKXR17T2Z 27 0.3 0.050 0.053 

20 200 46 500 2 060 4 700 2 100 8 500 NKXR20T2 NKXR20T2Z 32 0.3 0.090 0.095 

27 300 68 000 2 780 6 900 1 800 7 000 NKXR25T2 NKXR25T2Z 39 0.6 0.128 0.135 

27 800 72 500 2 840 7 400 1 500 6 000 NKXR30T2 NKXR30T2Z 44 0.6 0.162 0.169 

31 000 87 000 3 150 8 900 1 400 5 500 NKXR35T2 NKXR35T2Z 49 0.6 0.184 0.195 

43 000 121 000 4 350 12 400 1 200 4 800 NKXR40T2 NKXR40T2Z 56 0.6 0.226 0.237 

45 500 135 000 4 650 13 800 1 100 4 400 NKXR45T2 NKXR45T2Z 61 0.6 0.267 0.286 

48 000 150 000 4 900 15 300 1 000 4 000 NKXR50T2 NKXR50T2Z 66 0.6 0.309 0.329 

B-149


NTN 


Type NKXRIR 

Type NKXRZIR 

Type NKXRIR 

(Open type) 

Type NKXRZIR 

(With cover) 

d 

1245mm 




mm N kgf N kgf 

d dw D D1 D2 B C C1 C2 F a rs min 1) r1s min 1) Radial Axial 

–0 

–0.25 –0 

–0.20 


+0.050 

12 15 +0.032 24 28 29 16 23 9 6.5 15 23.7 0.3 0.3 8 250 10 200 840 1 040 12 900 28 600 1 310 2 920 

14 

+0.050 

17 +0.032 26 30 31 17 25 9 8 17 25.7 0.3 0.3 10 400 14 400 1 060 1 460 13 400 31 000 1 370 3 150 

17 

+0.061 

20 +0.040 30 35 36 20 30 10 10.5 20 30.7 0.3 0.3 16 400 27 100 1 670 2 760 20 200 46 500 2 060 4 700 

20 

+0.061 

25 +0.040 37 42 43 20 30 11 9.5 25 37.7 0.6 0.3 14 200 24 000 1 450 2 450 27 300 68 000 2 780 6 900 

25 

+0.061 

30 +0.040 42 47 48 20 30 11 9.5 30 42.7 0.6 0.3 22 300 39 500 2 280 4 000 27 800 72 500 2 840 7 400 

30 

+0.075 

35 +0.050 47 52 53 20 30 12 9 35 47.7 0.6 0.3 20 000 36 000 2 040 3 650 31 000 87 000 3 150 8 900 

35 

+0.075 

40 +0.050 52 60 61 20 32 13 10 40 55.7 0.6 0.3 25 900 52 500 2 650 5 350 43 000 121 000 4 350 12 400 

40 

+0.075 

45 +0.050 58 65 66.5 20 32 14 9 45 60.5 0.6 0.3 27 600 59 000 2 810 6 000 45 500 135 000 4 650 13 800 

45 

+0.075 

50 +0.050 62 70 71.5 25 35 14 10 50 65.5 0.6 0.6 27 900 62 000 2 850 6 300 48 000 150 000 4 900 15 300 

Note 1) Allowable minimum chamfer dimension r or r1. 

Remarks: Nominal code number of inner ring comprises IR. Bore diameterouter diameterwidth. 

B-150


NTN 

Limiting Bearing numbers Abutment Mass 

dimensions dimensions (approx.) 

r/min mm kg 

grease oil da db ras r1as Type Type 

Type NKXRIR Type NKXRZIR min min max max NKXRIR NKXRZIR 

2 800 11 000 NKXR15T2IR121516 NKXR15T2ZIR121516 25 14 0.3 0.3 0.056 0.060 









B-151

Needle roller bearings with angular contact ball bearings 

NTN 

Type NKIA59 

d 

1570mm 

Boundary dimensions Basic load ratings Limiting 

dynamic static dynamic static dynamic static dynamic static dimensions 

mm N kgf N kgf r/min 

Radial Axial grease oil 

d D C F rs min 1) Cr Cor Cr Cor Ca Coa Ca Coa 

15 28 18 20 0.3 9 500 13 400 970 1 370 2 340 3 050 239 310 13 000 20 000 

17 30 18 22 0.3 10 100 14 900 1 030 1 520 2 530 3 550 258 360 12 000 18 000 

20 37 23 25 0.3 16 500 22 100 1 680 2 250 4 700 6 150 480 625 11 000 16 000 

22 39 23 28 0.3 17 500 24 800 1 790 2 530 4 900 6 750 500 690 9 500 14 000 

25 42 23 30 0.3 17 400 25 000 1 770 2 550 5 100 7 350 520 750 8 500 13 000 

30 47 23 35 0.3 19 400 30 500 1 980 3 100 5 400 8 550 550 870 7 500 11 000 

35 55 27 42 0.6 25 700 46 000 2 630 4 700 7 400 12 300 755 1 260 6 500 9 500 

40 62 30 48 0.6 31 000 61 000 3 150 6 250 7 750 14 000 790 1 430 5 500 8 500 

45 68 30 55 0.6 33 000 69 500 3 350 7 100 8 500 17 100 870 1 740 5 000 7 500 

50 72 30 60 0.6 33 500 73 500 3 450 7 500 8 800 18 700 900 1 910 4 300 6 500 

55 80 34 63 1 44 500 95 500 4 500 9 700 14 300 33 000 1 460 3 350 4 300 6 500 

60 85 34 68 1 45 500 101 000 4 600 10 300 14 800 36 000 1 510 3 650 4 000 6 000 

65 90 34 75 1 46 000 106 000 4 700 10 800 15 200 39 000 1 550 4 000 3 700 5 500 

70 100 40 80 1 62 500 146 000 6 350 14 900 18 600 47 500 1 890 4 850 3 300 5 000 


Remarks: This complex can support bi-directional axial load. 

B-152

Needle roller bearings with angular contact ball bearings 

NTN 


numbers 

dimensions 

mm 

kg 

da Da Db ras 

min max max max (approx.) 

NKIA 5902 17.5 22 25.5 0.3 0.050 

NKIA 5903 19.5 24 27.5 0.3 0.056 

NKIA 5904 22.5 28 34.5 0.3 0.111 

NKIA59/22 24.5 31 36.5 0.3 0.120 

NKIA 5905 27.5 33 39.5 0.3 0.130 

NKIA 5906 32.5 38 44.5 0.3 0.147 

NKIA 5907 40 45 50 0.6 0.243 

NKIA 5908 45 51 57 0.6 0.347 

NKIA 5909 50 58 63 0.6 0.401 

NKIA 5910 55 63 67 0.6 0.410 

NKIA 5911 61 66.5 74 1 0.590 

NKIA 5912 66 71.5 79 1 0.632 

NKIA 5913 71 78.5 84 1 0.708 

NKIA 5914 76 84 94 1 1.05 

B-153

Needle roller bearings with three-point contact ball bearing 

NTN 

Type NKIB 59 

d 

1570mm 

Boundary dimensions Basic load ratings Limiting 

dynamic static dynamic static dynamic static dynamic static dimensions 


d D B C F rs min 1) Radial Axial grease oil 

–0 

–0.3 


15 28 20 18 20 0.3 10 800 13 600 1 100 1 390 2 750 4 200 280 430 13 000 20 000 

17 30 20 18 22 0.3 11 200 14 600 1 140 1 490 2 960 4 900 300 495 12 000 18 000 

20 37 25 23 25 0.3 21 300 25 500 2 170 2 600 4 650 7 400 475 755 11 000 16 000 

22 39 25 23 28 0.3 23 200 29 300 2 360 2 990 5 000 8 650 510 880 9 500 14 000 

25 42 25 23 30 0.3 24 000 31 500 2 450 3 200 5 150 9 250 525 945 8 500 13 000 

30 47 25 23 35 0.3 25 500 35 500 2 600 3 600 5 600 11 200 570 1 140 7 500 11 000 

35 55 30 27 42 0.6 32 000 50 000 3 300 5 100 7 050 14 900 720 1 520 6 500 9 500 

40 62 34 30 48 0.6 43 500 66 500 4 450 6 800 8 700 19 400 890 1 980 5 500 8 500 

45 68 34 30 52 0.6 46 000 73 000 4 700 7 450 9 100 21 400 925 2 180 5 000 7 500 

50 72 34 30 58 0.6 48 000 80 000 4 900 8 150 9 600 24 300 980 2 480 4 300 6 500 

55 80 38 34 63 1 58 500 99 500 6 000 10 100 11 400 29 400 1 170 3 000 4 300 6 500 

60 85 38 34 68 1 61 500 108 000 6 250 11 000 11 800 32 000 1 200 3 250 4 000 6 000 

65 90 38 34 72 1 62 500 112 000 6 350 11 400 12 100 34 000 1 240 3 500 3 700 5 500 

70 100 45 40 80 1 85 500 156 000 8 750 15 900 15 900 44 500 1 620 4 550 3 300 5 000 


Remarks: 1. This complex can support bi-directional axial load. 

2. The ball bearing of this complex bearing is complete with a synthetic resin cage, and the allowable operating temperature shall be 120˚C and, under continuous running, 100˚C or less. 

3. This bearing type is the imported product from INA, Germany. 

B-154

Needle roller bearings with three-point contact ball bearing 

NTN 


numbers 

dimensions 

mm 

kg 

da Da ras 


NKIB 5902R 17.5 25.5 0.3 0.052 

NKIB 5903R 19.5 27.5 0.3 0.058 

NKIB 5904R 22.5 34.5 0.3 0.107 

NKIB59/22R 24.5 36.5 0.3 0.122 

NKIB 5905R 27.5 39.5 0.3 0.134 

NKIB 5906R 32.5 44.5 0.3 0.151 

NKIB 5907R 40 50 0.6 0.247 

NKIB 5908R 45 57 0.6 0.320 

NKIB 5909R 50 63 0.6 0.380 

NKIB 5910R 55 67 0.6 0.385 

NKIB 5911R 61 74 1 0.555 

NKIB 5912R 66 79 1 0.595 

NKIB 5913R 71 84 1 0.640 

NKIB 5914R 76 94 1 0.985 

B-155

Needle roller bearings with double-direction thrust needle roller bearing 

NTN 

Type AXN 

d 

2050mm 





d dw D D1 T C F Dw rs min 1) r1s min 1) Radial Axial 

–0.20 –0 

–0.50 –0.370 –0 

–0.130 


+0.061 

20 20 +0.040 52 42 40 16 25 2 0.6 0.6 15 100 22 400 1 540 2 280 14 600 58 000 1 490 5 900 

25 

+0.061 

25 +0.040 57 47 44 20 30 2 0.6 0.6 22 100 34 000 2 260 3 500 16 300 69 500 1 660 7 100 

30 

+0.061 

30 +0.040 62 52 44 20 35 2 0.6 0.6 24 800 41 500 2 520 4 250 17 800 81 500 1 820 8 300 

35 

+0.075 

35 +0.050 70 60 48 20 40 3 1 0.6 26 400 47 000 2 700 4 800 27 400 110 000 2 790 11 300 

40 

+0.075 

40 +0.050 75 65 48 20 45 3 1 0.6 28 000 52 500 2 860 5 400 29 800 128 000 3 050 13 100 

45 

+0.075 

45 +0.050 80 70 54 25 50 3 1 0.6 38 500 74 500 3 950 7 550 31 500 143 000 3 250 14 500 

50 

+0.075 

50 +0.050 90 78 54 25 55 3 1 0.6 41 000 82 000 4 150 8 400 38 000 186 000 3 850 19 000 


B-156


NTN 

Limiting Bearing Radial Abutment Preload Starting torque 2) Mass 

dimensions numbers clearance dimensions 

r/min m mm N kgf Nmm kgfmm kg 

grease oil da Da ras r1as 

min max min max max max (approx.) 

1 800 7 000 AXN2052 10 30 39 46 0.6 0.6 1 300 130 330 33 0.400 

1 500 6 000 AXN2557 10 30 44 51 0.6 0.6 1 450 145 400 40 0.520 

1 400 5 500 AXN3062 10 40 50 56 0.6 0.6 1 600 160 550 55 0.590 

1 200 4 700 AXN3570 10 40 56 64 1 0.6 2 450 245 900 90 0.800 

1 100 4 300 AXN4075 10 40 62 69 1 0.6 2 650 265 1 050 105 0.890 

1 000 3 900 AXN4580 10 40 67 74 1 0.6 2 800 280 1 200 120 1.00 

900 3 500 AXN5090 15 50 75 83 1 0.6 3 400 340 1 600 160 1.42 

Note 2) Starting torque subject to standard preload. 

B-157


NTN 

Type ARN 

d 

2070mm 





d dw D D1 T C F Dw rs min 1) r1s min 1) Radial Axial 

–0.20 –0 

–0.50 –0.370 –0 

–0.130 


20 

+0.061 

20 +0.040 52 42 46 16 25 5 0.6 0.6 15 100 22 400 1 540 2 280 27 300 68 000 2 780 6 900 

20 

+0.061 

20 +0.040 62 52 60 20 30 7.5 1 0.6 22 100 34 000 2 260 3 500 53 500 129 000 5 450 13 100 

25 

+0.061 

25 +0.040 57 47 50 20 30 5 0.6 0.6 22 100 34 000 2 260 3 500 27 800 72 500 2 840 7 400 

25 

+0.061 

25 +0.040 72 62 60 20 35 7.5 1 0.6 24 800 41 500 2 520 4 250 54 500 139 000 5 550 14 200 

30 

+0.061 

30 +0.040 62 52 50 20 35 5 0.6 0.6 24 800 41 500 2 520 4 250 31 000 87 000 3 150 8 900 

30 

+0.061 

30 +0.040 80 68 66 20 40 9 1 0.6 26 400 47 000 2 700 4 800 74 500 190 000 7 600 19 400 

35 

+0.075 

35 +0.050 70 60 54 20 40 6 1 0.6 26 400 47 000 2 700 4 800 43 000 121 000 4 350 12 400 

35 

+0.075 

35 +0.050 85 73 66 20 45 9 1 0.6 28 000 52 500 2 860 5 400 82 000 222 000 8 350 22 600 

40 

+0.075 

40 +0.050 75 65 54 20 45 6 1 0.6 28 000 52 500 2 860 5 400 45 500 135 000 4 650 13 800 

40 

+0.075 

40 +0.050 90 78 75 25 50 9 1 0.6 38 500 74 500 3 950 7 550 85 000 238 000 8 650 24 200 

45 

+0.075 

45 +0.050 80 70 60 25 50 6 1 0.6 38 500 74 500 3 950 7 550 48 000 150 000 4 900 15 300 

45 

+0.075 

45 +0.050 105 90 82 25 55 11 1 0.6 41 000 82 000 4 150 8 400 121 000 340 000 12 300 34 500 

50 

+0.075 

50 +0.050 90 78 60 25 55 6 1 0.6 41 000 82 000 4 150 8 400 62 500 215 000 6 350 21 900 

50 

+0.075 

50 +0.050 110 95 82 25 60 11 1.1 0.6 41 000 85 000 4 200 8 700 125 000 365 000 12 800 37 000 

55 

+0.090 

55 +0.060 115 100 82 25 65 11 1.1 0.6 44 500 98 000 4 550 10 000 130 000 385 000 13 200 39 500 

60 

+0.090 

60 +0.060 120 105 82 25 70 11 1.1 0.6 45 000 91 500 4 600 9 350 134 000 410 000 13 700 42 000 

65 

+0.090 

65 +0.060 125 110 82 25 75 11 1.1 0.6 55 000 104 000 5 600 10 600 138 000 435 000 14 100 44 500 

70 

+0.090 

70 +0.060 130 115 82 25 80 11 1.1 0.6 57 000 119 000 5 800 12 200 142 000 460 000 14 500 47 000 


B-158


NTN 

Limiting Bearing Radial Abutment Preload Starting torque 2) Mass 

dimensions numbers clearance dimensions 

r/min m mm N kgf Nmm kgfmm kg 

grease oil da Da ras r1as 

min max min max max max (approx.) 

1 800 7 000 ARN2052T2 10 30 39 46 0.6 0.6 2 500 250 430 43 0.440 

1 500 6 000 ARN2062 10 30 48 56 1 0.6 4 950 495 1 150 115 0.910 

1 500 6 000 ARN2557T2 10 30 44 51 0.6 0.6 2 600 260 500 50 0.560 

1 200 4 900 ARN2572 10 40 56 66 1 0.6 5 050 505 1 400 140 1.22 

1 400 5 500 ARN3062T2 10 40 49 56 0.6 0.6 2 900 290 650 65 0.630 

1 100 4 400 ARN3080 10 40 63 73 1 0.6 6 900 690 2 100 210 1.54 

1 200 4 800 ARN3570T2 10 40 56 64 1 0.6 3 950 395 1 050 105 0.850 

1 000 4 100 ARN3585 10 40 68 77 1 0.6 7 600 760 2 500 250 1.67 

1 100 4 400 ARN4075T2 10 40 61 69 1 0.6 4 200 420 1 250 125 0.930 

950 3 800 ARN4090 10 40 73 87 1 0.6 7 850 785 2 850 285 2.15 

1 000 4 000 ARN4580T2 10 40 66 74 1 0.6 4 450 445 1 550 155 1.16 

850 3 300 ARN45105 15 50 83 96 1 0.6 11 200 1 120 4 350 435 3.16 

900 3 600 ARN5090 15 50 75 83 1 0.6 5 800 580 2 050 205 1.48 

800 3 100 ARN50110 15 50 88 101 1 0.6 11 600 1 160 4 900 490 3.38 

750 2 900 ARN55115 15 50 93 106 1 0.6 12 000 1 200 5 500 550 3.61 

700 2 700 ARN60120 15 50 98 111 1 0.6 12 400 1 240 6 000 600 3.81 

650 2 600 ARN65125 15 50 103 116 1 0.6 12 800 1 280 6 500 650 4.00 

650 2 500 ARN70130 15 50 106 121 1 0.6 13 200 1 320 7 000 700 4.25 

Note 2) Starting torque subject to standard preload. 

B-159

B-160

Roller Followers / Cam Followers

Roller followers: Yoke-type track rollers 

NTN 

Roller Followers (Yoke Type Track Rollers) 

NTN Yoke Type Track Rollers is the rolling 

mechanisms whose outer ring rolls on a track. For 

example, these track rollers are applied to eccentric roller, 

guide roller, rocker arm roller, cam roller and pressure 

roller. For that, the outer ring is designed to such a wall 

thickness as to be resistible to high load and shock load. 

Both of spherical outer surface (rolling surface) and 

cylindrical outer surface are available for the outer ring. 

The spherical outer ring can damp edge-load acting on 

the contact surface between the track and the track roller, 

while the cylindrical outer ring (Tail code: X) has track 

load capacity greater than the spherical outer ring. 

Bearing type 

Applied shaft 

diameter (mm) 

Load capacity 



RNA22 

RNA 22 / 6 LL 

Tail code 

LL: Seal 



NA22 

658 

Cor 

Cr 

NA 22 06 X LL 

Type code 

Tail code 

LL: Seal 

Tail code 

X: Cylinder outer diameter 



Type code 

NATR 

NATR 30 X LL 

550 

Cor 

Cr 

Tail code 

LL: Seal 

Tail code 



Type code 

NATV 

NATV 25 LL 

550 

Cor 

Tail code 

LL: Seal 

Cr 


Type code 

NACV 

NACV 32 X LL 

6.3557.15 

Cor 

Cr 

Tail code 

LL: Seal 

Tail code 



Type code 

NUTR 

NUTR 3 10 

1550 

Cor 

Cr 



Type code 

NUTW 

NUTW 2 05 X 

 

Cor 

Tail code 



Cr 


Type code 

Each listed load capacity is subject to reference bearing bore diameter of 50 or 50.8 

B-162


NTN 

Track roller components 

Features 


Type with cage 

Inner ring 

: without 

Outer profile 

: spherical 

Seal 

: with 



Inner ring 

: with 

Outer profile 

: cylindrical 

Seal 

: with 

¡The needle rollers and the cage are retained in the outer ring with a steel plate 

reinforced synthetic rubber seal, and these are inseparable from each other. 

¡The needle rollers guided by cage. 

¡Shaft (Pin) must be provided with a thrust washer or a flange to guide the outer ring. 



Outer profile 

: cylindrical 

Seal 

: with 

¡Needle rollers guided by cage. 

¡The outer ring is guided in axial direction by the thrust washer press-fitted in the inner 

ring. 

¡Labyrinth is formed between the outer ring and the thrust 

washer. 


Full complement roller type 

Outer profile 

: cylindrical 

Seal 

: with 

Inscribed circle diameter :15.875 

Full complement roller type 

Outer profile 

: cylindrical 

Seal 

: with 

¡The outer ring is guided in axial direction by the thrust washer press-fitted in the inner 

ring. 

¡Great rated load due to the full complement roller type. 

¡Lower allowable running speed than bearing with cage. 

¡Labyrinth is formed between the outer ring and the thrust washer. 


Double-row cylindrical 

Full-complement roller type 


Outer profile 

: spherical 


Double-row cylindrical 

Full-complement roller type with 

center rib 


Outer profile 

: spherical 

¡Greater rated load, best-suited to applications subjected to high load and shock load. 

¡A steel plate is press-fitted in the outer ring to form labyrinth between the plate and 

the side plates at both sides of the inner ring, whereby the required sealing 

performance is secured and the side plates are held so as not to separate from 

one another. 

¡The inner ring and the side plates are tightened together in axial direction for 

non-clearance. 

¡The outer ring is guided in axial direction by the outer ring ribs and the end faces of 

cylindrical roller. 

Particularly Type NUTW provides the following features. 

¡The greatest rated load, of the roller followers. 

¡Due to the outer ring with inner ribs, this type is excellently resistible to axial load and 

moment load and, in addition, runs smoothly, though depending on actual 

operatingconditions. 

¡Good lubrication effect and longer life are expectable by increasing thegrease fill volume. 

B-163


NTN 

Bearing Tolerances 

The respective dimensional accuracy, profile accuracy 

and running accuracy of the bearing bore diameter (d), 

cylindrical roller outer diameter (D), and outer ring width 

(C) are as shown in Table 4.3 of Section 4. "Bearing 

Accuracy" (page A-26). (Conforming to JIS Accuracy 

Class-0) 

On the other hand, the dimensional tolerances for 

spherical roller outer diameter (D) and the roller inscribed 

circle diameter (FW) of Type RNA22 are as shown in 

applicable Dimensions Table. 

(2) Where the roller follower is mounted, locate the inner 

ring oil hole within the non-load area (load free side). 

(Fig. 2) 

If the oil hole locates within the load area, it would 

cause shorter life. 

Oil hole 

Bearing fits and radial clearance 

The tolerance range class of shaft against bearing with 

inner ring shall be g6 (h6) and, where a shaft is used as 

the direct raceway surface (Type RNA22), the tolerance 

range class of the shaft shall be k5 (k6). In general, the 

outer ring is not fitted in a housing. Mounting relations 

Table 1 Radial clearances 

Nominal roller 

inscribed circle dia. 

Fw (mm) C2 

Clearance 

Ordinary C3 C4 

over Incl. min max min max min max min max 

3 

6 

10 

18 

30 

50 

80 

6 

10 

18 

30 

50 

80 

100 

0 

0 

0 

0 

0 

0 

0 

10 

12 

15 

20 

25 

30 

35 

3 

5 

5 

10 

10 

15 

20 

17 

20 

25 

30 

40 

50 

55 

15 

15 

15 

20 

25 

30 

35 

30 

30 

35 

40 

55 

65 

75 

20 

25 

30 

40 

50 

60 

70 

Unit: m 

40 

45 

55 

65 

80 

100 

115 

Fig.2 

Load 

(3) Type NA22LL and RNA22 are of separable type 

and, hence, the outer ring is guided by flange or thrust 

washer mounted on shaft (pin). Therefore, the guide 

surface must be finished more precisely than by latheturning 

and deburred completely for surface 

smoothing. In addition, when the guide surface is not 

hardened the outer ring must be guided at A- 

dimension shown in Fig.3. When it is hardened, even 

a little smaller guide surface can be used. 

1 

ADe 

2 

For D and e dimensions refer to applicable Dimensions Table. 

(1) The side face height in the roller follower mount must 

be made larger than “e” dimension described in 

applicable Dimensions Table. (Fig.1) In mounting, 

chamfer the mounting surface at R as small as 

possible (around 0.545˚) and bring the inner ring 

and the end face of side plate in precise contact with 

one another. 

Fig.3 

In assembling this bearing, it must be handled with 

good care to protect the seal lip from bending and flaw. 

Side face 

height 

Fig.1 

Where any of NTN roller followers was stubmounted, 

non-uniform load (bias load) could act 

on the bearing, inversely affected by fitting 

loose arising from further continued running. 

Good care must be exercised of such fitting 

loose, for stable running of the equipment. 

B-164


NTN 

Lubrication 

The roller followers with synthetic rubber seal (with tail 

code : LL) and the full complement roller type followers 

are filled up with lithium soap base grease so that they 

can be used in the temperature range of -25 to +100˚C. 

Lubricant feeding and replenishing into the bearing are 

done through an oil hole provided on the inner ring. In this 

case, the inner ring must be fitted so the oil hole locates 

within non-load area. For the full complement roller type 

roller followers NATV, NACV, NUTR and NUTW with no 

cage, it is necessary to shorten the grease replenishing 

interval. 

Further, a roller follower with cage and without seal is 

not filled up with lubrication grease. When needing a 

follower with grease-filled cage, feel free to contact NTN. 

The outer ring outer surface of bearing and 

the track surface must both be lubricated. 

Failure to lubricate could result earlier in 

damage of the bearing. 

Track load capacity 

Statically allowable maximum radial load on the contact 

surface of track to track roller is referred to as "track load 

capacity", which differs depending on the track hardness. 

The track load capacity described in applicable 

Dimensions Table is subject to track hardness HRC40. If 

the hardness value is other than HRC40, multiply the 

track load capacity in the Dimensions Table by the 

adjustment factor G in Table 2, for determining the track 

load capacity. However, the track load capacity shall be 

C0r if the calculated track load capacity exceeds the basic 

static load rating C0r of bearing. 

Refer to page A-55 for the detail. 

Table 2 Adjustment factor G 

Hardness 

HRC 

20 

25 

30 

35 

40 

45 

50 

55 

Adjustment factor G 

Cylindrical surface Spherical surface 

0.37 

0.46 

0.58 

0.75 

1.00 

1.40 

2.00 

2.80 

0.22 

0.31 

0.45 

0.65 

1.00 

1.70 

2.80 

4.70 

B-165

Roller followers : Yoke type truck rollers (sealed type) 

NTN 

Metric series 

Type NA22LL 

Type RNA22LL 

Type NA22LL 

(With inner ring) 

Type RNA22LL 

(Without inner ring) 

D 

1990mm 

Boundary dimentions Basic load ratings Load ratings of truck 



0 

0.05 

Cr Cor Cr Cor 

D B C d Fw e F rs min 1) 

19 

0.022 

0.013 

24 

0.027 

0.016 

30 

0.027 

0.016 

32 

0.027 

0.016 

35 

0.033 

0.020 

40 

0.033 

0.020 

47 

0.033 

0.020 

52 

0.033 

0.020 

62 

0.041 

0.025 

72 

0.041 

0.025 

80 

0.041 

0.025 

85 

0.049 

0.030 

90 

0.049 

0.030 


2) For bearing with cylindrical outer surface, the nominal bearing is followed by "X". In this case, the bearing is manufactured with outer ring diameter tolerance 

conforming to JIS Class-0. Ex. NA2203XLL 

B-166

Roller followers : Yoke type truck rollers (sealed type) 

Limiting Bearing numbers Mass 

speeds 

(approx.) 

r/min 

kg 

grease Type Type Type Type 

NA22LL 2) RNA22LL 2) NA22LL RNA22LL 

10 000 NA22/6LL RNA22/6LL 0.023 0.018 

10 000 NA22/8LL RNA22/8LL 0.035 0.027 

10 000 NA2200LL RNA2200LL 0.060 0.052 

9 500 NA2201LL RNA2201LL 0.067 0.057 

7 500 NA2202LL RNA2202LL 0.075 0.060 

7 000 NA2203LL RNA2203LL 0.113 0.094 

6 000 NA2204LL RNA2204LL 0.176 0.152 

5 000 NA2205LL RNA2205LL 0.209 0.179 

4 300 NA2206LL RNA2206LL 0.322 0.284 

3 600 NA2207LL RNA2207LL 0.506 0.432 

3 100 NA2208LL RNA2208LL 0.623 0.530 

2 900 NA2209LL RNA2209LL 0.638 0.545 

2 600 NA2210LL RNA2210LL 0.682 0.563 

B-167


NTN 

Metric series 

Type NATR 

Type NATRLL 

Type NATV 

Type NATVLL 

D 

B 

C 

R500 

d F e 

Type NATR 

(With cage) 

Type NATRLL 

(Sealed type with cage) 

D 

1690mm 

Boundary dimensions Basic load ratings Load ratings of truck Limiting speeds 



D B C d e Fw grease oil 

0 

0.05 

16 

Cr Cor Cr Cor 

12 11 5 12 8 4 050 4 200 415 430 1 080 3 400 110 350 19 000 25 000 

0 

120.180 

11 5 12 8 6 500 9 350 665 955 1 080 3 400 110 350 13 000 16 000 

19 

24 

30 

32 

35 

40 

47 

52 

62 

72 

12 0 11 6 14 10 4 750 5 400 480 555 1 380 4 050 141 415 15 000 20 000 

0.180 

12 11 6 14 10 7 450 11 700 760 1 190 1 380 4 050 141 415 10 000 13 000 

15 0 14 8 19 12 6 900 7 700 705 785 1 900 6 650 193 680 12 000 16 000 

0.180 

15 14 8 19 12 10 700 16 200 1 090 1 650 1 900 6 650 193 680 8 500 11 000 

15 0 14 10 23 15 7 850 9 650 800 985 2 620 7 700 267 785 10 000 13 000 

0.180 

15 14 10 23 15 12 000 20 300 1 230 2 070 2 620 7 700 267 785 6 500 8 500 

15 0 14 12 25 17 8 850 11 700 900 1 190 2 860 8 200 291 835 9 000 12 000 

0.180 

15 14 12 25 17 13 000 23 000 1 330 2 350 2 860 8 200 291 835 6 000 7 500 

19 0 18 15 27 20 13 300 20 800 1 360 2 120 3 200 11 900 325 1 220 7 500 10 000 

0.210 

19 18 15 27 20 18 400 38 000 1 870 3 900 3 200 11 900 325 1 220 5 000 6 500 

21 0 20 17 32 22 14 000 22 800 1 430 2 330 3 850 14 500 390 1 480 7 000 9 000 

0.210 

21 20 17 32 22 19 400 42 000 1 980 4 250 3 850 14 500 390 1 480 4 500 6 000 

25 0 24 20 37 25 20 700 33 500 2 110 3 450 4 700 21 000 480 2 150 6 000 8 000 

0.210 

25 24 20 37 25 28 800 61 000 2 940 6 250 4 700 21 000 480 2 150 4 000 5 000 

25 0 24 25 42 30 22 800 40 500 2 320 4 100 5 500 23 300 565 2 370 5 000 6 500 

0.210 

25 24 25 42 30 31 500 73 500 3 200 7 500 5 500 23 300 565 2 370 3 300 4 500 

29 0 28 30 51 38 36 000 66 000 3 650 6 750 6 950 33 000 710 3 350 4 000 5 500 

0.210 

29 28 30 51 38 47 500 115 000 4 850 11 700 6 950 33 000 710 3 350 2 600 3 500 

29 0 28 35 58 44.5 39 000 77 000 3 950 7 850 8 050 37 000 820 3 750 3 300 4 500 

0.210 

29 28 35 58 44.5 52 000 134 000 5 300 13 600 8 050 37 000 820 3 750 2 200 2 900 

32 0 30 40 66 50 49 500 92 500 5 050 9 400 9 800 44 500 1 000 4 500 3 000 4 000 

80 0.250 

32 30 40 66 50 68 500 171 000 7 000 17 500 9 800 44 500 1 000 4 500 2 000 2 600 

0 

85 320.250 

30 45 71 55 51 500 100 000 5 250 10 200 10 400 47 000 1 060 4 800 2 700 3 600 

32 0 30 50 76 60 53 000 108 000 5 450 11 000 11 400 50 000 1 160 5 100 2 500 3 300 

90 0.250 

32 30 50 76 60 76 000 205 000 7 750 20 900 11 400 50 000 1 160 5 100 1 600 2 100 

Note 1) For bearing with cylindrical outer surface, the nominal bearing is followed by "X". In this case, the bearing is manufactured with outer ring diameter tolerance 

conforming to JIS Class-0. Ex. NATR5X 

Remarks: For the follower with seal, the maximum revolutions is allowable up to 10 000 r/min. 

B-168


NTN 

B 

C 

D 

R 

d F e 

Type NATV 

(Full complement type) 

Type NATVLL 

(Full complement type with seals) 

Bearing numbers 1 

Mass 

kg 

Type NATR Type NATRLL 

Type NATV Type NATVLL (approx.) 

NATR5 NATR5LL 0.018 

NATV5 NATV5LL 0.020 


























B-169


NTN 

Inch series 

Type NACVX 

Type NACVXLL 

Type NACVX 

(Full complement) 

D 

19.050152.400mm 

Boundary dimentions 




D B C d e Fw 

–0 

–0 

–0 

–0.025 

–0.250 

–0.130 

Cr Cor Cr Cor 

19.050(#/4) 14.288((/16) 12.700(!/2) 6.350(!/4) 

0.005 

0.010 15.5 11 8 050 13 300 825 1 360 

22.225(&/8) 14.288((/16) 12.700(!/2) 6.350(!/4) 

0.005 

0.010 15.5 11 8 050 13 300 825 1 360 

25.400(1) 17.462(!!/16) 15.875(%/8) 7.938(%/16) 

0.005 

0.010 19.5 14 11 700 18 900 1 190 1 920 

28.575(1 !/8) 17.462(!!/16) 15.875(%/8) 7.938(%/16) 

0.005 

0.010 19.5 14 11 700 18 900 1 190 1 920 

31.750(1 !/4) 20.638(!#/16) 19.050(#/4) 9.525(#/8) 

0.005 

0.010 25 18.47 17 700 35 000 1 810 3 600 

34.925(1 #/8) 20.638(!#/16) 19.050(#/4) 9.525(#/8) 

0.005 

0.010 25 18.47 17 700 35 000 1 810 3 600 

38.100(1 !/2) 23.812(!%/16) 22.225(&/8) 11.112(&/16) 

0.005 

0.010 27 21 21 100 45 500 2 150 4 650 

41.275(1 %/8) 23.812(!%/16) 22.225(&/8) 11.112(&/16) 

0.005 

0.010 27 21 21 100 45 500 2 150 4 650 

44.450(1 #/4) 26.988(1 !/16) 25.400(1) 12.700(!/2) 

0.005 

0.010 31.5 24.65 28 400 60 500 2 900 6 150 

47.625(1 &/8) 26.988(1 !/16) 25.400(1) 12.700(!/2) 

0.005 

0.010 31.5 24.65 28 400 60 500 2 900 6 150 

50.800(2) 33.338(1 %/16) 31.750(1 !/4) 15.875(%/8) 

0.005 

0.010 36.5 26.71 41 000 87 500 4 200 8 950 

57.150(2 !/4) 33.338(1 %/16) 31.750(1 !/4) 15.875(%/8) 

0.005 

0.010 36.5 26.71 41 000 87 500 4 200 8 950 

63.500(2 !/2) 39.688(1 (/16) 38.100(1 !/2) 19.050(#/4) 

0.005 

0.010 44 31.15 54 500 119 000 5 600 12 200 

69.850(2 #/4) 39.688(1 (/16) 38.100(1 !/2) 19.050(#/4) 

0.005 

0.010 44 31.15 54 500 119 000 5 600 12 200 

76.200(3) 46.038(1 !#/16) 44.450(1 #/4) 25.400(1) 

0.002 

0.013 53 36.85 76 500 177 000 7 800 18 000 

82.550(3 !/4) 46.038(1 !#/16) 44.450(1 #/4) 25.400(1) 

0.002 

0.013 53 36.85 76 500 177 000 7 800 18 000 

88.900(3 !/2) 52.388(2 !/16) 50.800(2) 

0.002 

28.575(1 !/8) 

0.013 60 44.5 84 500 214 000 8 650 21 800 

101.600(4) 58.738(2 %/16) 57.150(2 !/4) 

0.002 

31.750(1 !/4) 

0.013 63 44.5 106 000 244 000 10 800 24 900 

127.000(5) 73.025(2 &/8) 69.850(2 #/4) 

0.002 

44.450(1 #/4) 

0.013 89 68.7 189 000 520 000 19 300 53 000 

152.400(6) 85.725(3 #/8) 82.550(3 !/4) 

0.002 

57.150(2 !/4) 

0.013 110 81.35 260 000 675 000 26 500 68 500 

Note 1) For the bearing with spherical outer surface, "X" symbol shall be deleted from the Nominal number. In this case, spherical bearing (R=500) is manufactured 

with tolerance 0/ -0.05 against the outer ring outer diameter "D". Ex. NACV12 

B-170


NTN 

Type NACVXLL 

(Full complement sealed type) 

Load ratings of truck Limiting Bearing numbers Mass 

speeds 

(approx.) 


grease oil Type Type Type 

NACVX 1 NACVXLL 1 NACVX 

4 600 1 380 470 140 9 000 11 000 NACV12X NACV12XLL 0.027 

5 350 1 710 545 174 9 000 11 000 NACV14X NACV14XLL 0.036 

7 400 2 060 755 210 7 100 9 200 NACV16X NACV16XLL 0.059 

8 350 2 430 850 248 7 100 9 200 NACV18X NACV18XLL 0.073 

11 400 2 840 1 160 290 5 400 7 000 NACV20X NACV20XLL 0.109 

12 500 3 250 1 280 330 5 400 7 000 NACV22X NACV22XLL 0.132 

16 300 3 600 1 660 365 4 800 6 200 NACV24X NACV24XLL 0.177 

17 600 4 050 1 800 410 4 800 6 200 NACV26X NACV26XLL 0.218 

21 600 4 400 2 200 450 4 100 5 300 NACV28X NACV28XLL 0.281 

23 200 4 850 2 360 495 4 100 5 300 NACV30X NACV30XLL 0.327 

31 000 5 300 3 150 540 3 700 4 800 NACV32X NACV32XLL 0.454 

35 000 6 200 3 550 635 3 700 4 800 NACV36X NACV36XLL 0.585 

44 500 7 200 4 550 735 3 200 4 100 NACV40X NACV40XLL 0.902 

49 000 8 250 5 000 840 3 200 4 100 NACV44X NACV44XLL 1.05 

64 000 9 150 6 500 935 2 700 3 500 NACV48X NACV48XLL 1.39 

69 000 10 000 7 050 1 020 2 700 3 500 NACV52X NACV52XLL 1.66 

86 000 11 100 8 800 1 130 2 200 2 800 NACV56X NACV56XLL 2.19 

112 500 13 200 11 500 1 350 2 200 2 800 NACV64X NACV64XLL 3.22 

165 500 17 900 16 900 1 830 1 500 1 900 NACV80X NACV80XLL 6.08 

239 500 22 100 24 400 2 250 1 200 1 500 NACV96X NACV96XLL 10.0 

Remarks: For the follower with seal, the maximum revolutions is allowable up to 10 000 r/min. 

B-171


NTN 

Metric series 

Type NUTR2 

Type NUTR3 

B 

C 

r 

D 

R500 

d 

F 

e 

D 

35110mm 

Boundary dimensions Basic load ratings Load ratings of truck Limiting Bearing 2) Mass 

mm dynamic static dynamic static speeds numbers 

N kgf N kgf r/min kg 

D B C d e Fw rs min 1) grease 

0 

0.05 


0 

35 190.210 

18 15 20 19 0.3 22 300 25 700 2 280 2 620 3 200 11 900 325 1 220 5 500 NUTR202 0.100 

0 

40 210.210 

20 17 22 21.5 0.3 24 100 29 100 2 450 2 970 3 850 14 500 390 1 480 4 700 NUTR203 0.147 

0 

42 190.210 

18 15 20 19 0.3 22 300 25 700 2 280 2 620 4 100 14 300 415 1 460 5 500 NUTR302 0.160 

47 

21 0 20 17 22 21.5 0.3 24 100 29 100 2 450 2 970 4 700 17 000 480 1 740 4 700 NUTR303 0.222 

0.210 

25 24 20 27 25.5 0.3 38 500 48 000 3 950 4 900 4 700 21 000 480 2 150 4 000 NUTR204 0.245 

52 

62 

25 0 24 20 27 25.5 0.3 38 500 48 000 3 950 4 900 5 550 23 300 565 2 370 4 000 NUTR304 0.321 

0.210 

25 24 25 31 30 0.3 42 500 57 500 4 350 5 850 5 550 23 300 565 2 370 3 300 NUTR205 0.281 

25 0 24 25 31 30 0.3 42 500 57 500 4 350 5 850 6 950 27 800 710 2 830 3 300 NUTR305 0.450 

0.210 

29 28 30 38 35 0.3 56 500 72 500 5 750 7 400 6 950 33 000 710 3 350 2 900 NUTR206 0.466 

29 0 28 30 38 35 0.3 56 500 72 500 5 750 7 400 8 050 38 500 820 3 900 2 900 NUTR306 0.697 

72 0.210 

29 28 35 44 41.5 0.6 62 000 85 500 6 350 8 700 8 050 37 000 820 3 750 2 400 NUTR207 0.630 

0 

290.210 

28 35 44 41.5 0.6 62 000 85 500 6 350 8 700 9 800 41 000 1 000 4 150 2 400 NUTR307 0.840 

80 0 32 30 40 51 47.5 0.6 87 000 125 000 8 850 12 700 9 800 44 500 1 000 4 500 2 100 NUTR208 0.817 

0.250 

0 

85 320.250 

30 45 55 52.5 0.6 92 000 137 000 9 350 14 000 10 400 47 000 1 060 4 800 1 900 NUTR209 0.883 

32 0 30 40 51 47.5 0.6 87 000 125 000 8 850 12 700 11 400 50 000 1 160 5 100 2 100 NUTR308 1.13 

90 0.250 

32 30 50 60 57 0.6 96 500 150 000 9 800 15 300 11 400 50 000 1 160 5 100 1 800 NUTR210 0.950 

0 

100 320.250 

30 45 55 52.5 0.6 92 000 137 000 9 350 14 000 13 000 55 500 1 330 5 650 1 900 NUTR309 1.40 

0 

110 320.250 

30 50 60 57 0.6 96 500 150 000 9 800 15 300 14 700 61 000 1 500 6 200 1 800 NUTR310 1.69 


2) For bearing with cylindrical outer surface, the nominal bearing is followed by "X". In this case, the bearing is manufactured with outer ring diameter tolerance 

conforming to JIS Class-0. Ex. NUTR208X 

B-172


NTN 

Metric series 

Type NUTW2 

D 

3590mm 

Boundary dimensions Basic load ratings Load ratings of truck Limiting Bearing 2) Mass 

mm dynamic static dynamic static speeds numbers 

N kgf N kgf r/min kg 

D B C d e Fw rs min 1) grease 

0 

0.05 


0 

35 220.210 

21 15 20 19 0.3 24 100 28 300 2 460 2 880 3 200 14 200 325 1 450 5 500 NUTW202 0.115 

0 

40 240.210 

23 17 22 21.5 0.3 26 000 32 000 2 650 3 250 3 850 17 100 390 1 740 4 700 NUTW203 0.167 

0 

47 290.210 

28 20 27 25.5 0.3 40 500 51 500 4 150 5 250 4 700 25 100 480 2 560 4 000 NUTW204 0.280 

0 

52 290.210 

28 25 31 30 0.3 45 000 61 500 4 600 6 250 5 550 27 700 565 2 830 3 300 NUTW205 0.322 

0 

62 350.210 

34 30 38 35 0.3 59 500 77 000 6 050 7 900 6 950 41 000 710 4 200 2 900 NUTW206 0.549 

0 

72 350.210 

34 35 44 41.5 0.6 65 000 91 000 6 650 9 250 8 050 46 000 820 4 700 2 400 NUTW207 0.747 

0 

80 380.250 

36 40 51 47.5 0.6 90 500 131 000 9 250 13 400 9 800 54 500 1 000 5 550 2 100 NUTW208 0.953 

0 

85 380.250 

36 45 55 52.5 0.6 95 500 144 000 9 750 14 700 10 400 58 000 1 060 5 900 1 900 NUTW209 1.03 

0 

90 380.250 

36 50 60 57 0.6 100 000 158 000 10 200 16 100 11 400 61 500 1 160 6 250 1 800 NUTW210 1.11 

B-173

Cam followers stud type truck rollers 

NTN 

Cam Followers (Stud Type Track Roller) 

This is a track roller complete with stud instead of inner 

ring, which of the outer ring rolls on the track. These NTN 

stud type track rollers are applied to eccentric roller, guide 

roller, rocker arm roller, etc. similarly to the roller 

followers. One end of the stud is so threaded as to 

facilitate mounting thereof. And the outer ring is guided in 

axial direction by the side plates which are press-fitted in 

the flange end of the stud and the stud itself. 

The outer ring has a thick wall and both of spherical 

outer profile and cylindrical outer surface (tail code: X) are 

available for it similarly to the outer ring of the roller 

follower. 

Follower type 

Applied shaft 

diameter (mm) 

Load capacity 



KR 

CR 

KR 12 T2 H / 3A 

KR 

330 

CR 

4.82622.225 

Tailed code 


H: With hexagon hole 

3A: grease 


Type code 

Cor 

KRT 

Cr 

KRT 32 X LL 

KR90 

Tail code 

LL: Seal 

630 

Tailed code 



Type code 

KRV 

CRV 

CRV 30 X LL 

KRV 

330 

CRV 

4.82663.5 

Tail code 

LL: Seal 

Tailed code 



Type code 

Cor 

KRVT 

Cr 

KRVT 52 X LL 

630 

KRV90 

Tail code 

LL: Seal 

Tailed code 



Type code 

Each listed load capacity is subject to the reference bearing diameter of 30. 

B-174


NTN 

Follower components 

Features 

Outer ring outer diameter :12 

With metric series cage 

Without seal 

Outer profile : spherical 

Stud head : with hexagon hole 

Cage : resin cage 

Grease : already filled 



Stud head : with recessed slot 

for screwdriver use 

and tapped hole 

Outer surface profile : cylindrical 

Seal 

: with 

Grease 

: already filled. 

¡Standard cage is of steel plate punched type. 

¡Polyamide resin cage (Tail code: T2) can be used, too. 

Allowable temperature: 120˚C 

Continuous operating temperature: 100˚C or less 

¡Suited to high speed. 

¡Due to much filled grease, these types can be used for a long time 

without additional greasing though actual operating conditions. 

¡The standard follower of Type KRT has no hexagon hole (tail code: H), 

but with a threaded plug with hexagon socket as standard. 

¡The follower with neither seal nor grease code as tail code is of 

grease non-filled type. 

Outer ring outer diameter :47.825 

Inch series full-complement roller type 

Stud head : with recessed slot 



Seal 

: with 

Grease 




Stud head : With recessed slot 


and tapped hole 


Seal 

: with 

Grease 


¡Suited to high load. 

¡Lower allowable running speed than the type with cage. 

¡Grease replenishing interval must be shortened due to the small 

spacing volume. 

¡he standard follower of Type KRVT has no hexagon hole (tail code H), 

but with a threaded plug with hexagon socket as standard. 

B-175


NTN 

Follower type 

Applied shaft 

diameter (mm) 

Load capacity 



KRU 

KRU 32 LL 

630 

Cor 

Tail code 

LL: seal 

Cr 

KRU90 


Type code 

KRVU 

KRVU 62 X LL 

630 

Cor 

Cr 

 

Tail code 

LL: seal 

Tail code 

X: Cylinder outer 

diameter 


KRVU90 

Type code 

NUKR 

NUKR 80 H 

1264 

Tail code 

H: with hexagon 

socket 


Type code 

NUKRT 

NUKRT 90 

1264 

Cor 


Cr 

Type code 

NUKR90 

NUKRU 

NUKRU 140 X 

1264 

Tail code 

X: Cylinder outer 

diameter 



Each listed load capacity is subject to the reference bearing diameter of 30. 

B-176


NTN 

Follower components 

Features 

Outer ring outer diameter:32 

Metric series stud with cage, eccentric type 

Stud head : with recessed slot for screwdriver 

use and tapped hole 


Seal : with 



Metric series stud with cage, eccentric type 

Stud head : Metric series full-complement 

roller type stud, eccentric type 

Seal : with 

Outer profile : cylindrical 


¡Unlike Type KRT and KRVT, Type KRU and KRVU have the eccentric 

stud (eccentricity : 0.25 to 1.0mm) so as to enable to adjust positional 

variation of the stud mounting hole. 

¡The standard follower has no hexagon hole (tail code H), but with a 

threaded plug with hexagon socket as standard. 

¡Type KRU --without seal. In addition, the same follower with no grease 

code is of grease non-filled type. 


Metric series double-row cylindrical roller type 

Shielded full-complement roller type 

Stud head : with hexagon socket 

Seal : with 





Shielded full-complement roller type 





¡Highest rated load, best-suited to applications subjected to high load 

and shock load. 

¡The outer ring is guided in axial direction by the outer ring ribs and the 

end faces of cylindrical roller. 

¡Grease replenishing interval must be shortened due to the small 

spacing volume. 

¡Type NUKRU has the eccentric stud (eccentricity: 0.4 to 2.5mm) so 

as to enable to adjust positional variation of the stud mounting hole. 

¡The standard followers of Type NUKRT and NUKRU have no hexagon 

hole (tail code H), but with a threaded plug with hexagon socket as 

standard. 



Shielded full-complement roller type stud, 

eccentric type 



Outer profile : cylindrical 


 

B-177


NTN 


The dimensional accuracy and profile accuracy of 

cylindrical roller outer diameter (D) and outer ring width 

(C), and the running accuracy of bearing assy are as 

shown in Tables 4.3 and 4.4 of Section 4 "Bearing 

Tolerances" (page A-26) and the accuracy class of each 

conforms to JIS Class-0. The dimensional accuracy of 

spherical outer diameter (D) and stud diameter (d1) are as 

shown in applicable Dimensions Table. 

Bearing fit and radial internal clearance 

Table 1 shows the recommended fitting tolerance for 

the stud mounting hole. 

And Table 2 shows the radial internal clearance. 

Fitting relations 

(1) Make the face height at the cam follower mount 

greater than "e" dimension given in applicable 

Dimension Table. (Fig.1) 

Furthermore, chamfer the stud mounting hole at R as 

small as possible (around 0.545˚) and bring the side 

faces of side face in precise contact. 

e 

Face height 

Table 1 Recommended tolerance 


Classification for mounting hole 

Metric series H7 

Inch series 

F7 

Table 2 Radial internal clearance 

Unit : m 

Nominal roller 

inscribed circle 

Clearance 

diameter 

Fwmm C2 CN (ordinary) C3 C4 


3 

6 

10 

18 

30 

50 

80 

6 

10 

18 

30 

50 

80 

100 

0 

0 

0 

0 

0 

0 

0 

10 

12 

15 

20 

25 

30 

35 

3 

5 

5 

10 

10 

15 

20 

17 

20 

25 

30 

40 

50 

55 

15 

15 

15 

20 

25 

30 

35 

30 

30 

35 

40 

55 

65 

75 

20 

25 

30 

40 

50 

60 

70 

Note) When shock load acts on, make the stud - hole 

clearance as less as possible in assembling. 

40 

45 

55 

65 

80 

100 

115 

Fig. 1 

(2) Don't hammer directly the cam follower rib. Doing 

so would cause breakdown and rotation failure of 

the rib. 

Fig. 2 

(3) The oil hole position on the stud raceway surface is 

shown with NTN mark stamped on the stud rib 

surface. Mount the stud so the oil hole locates within 

the non-load area (non-load side). (Fig. 3) If the oil 

hole locates within the load area, it would cause 

shorter life of the follower. 

Loading 

Loading 

Fig. 3 

B-178


NTN 

(4) Particularly where loose of the mounting screw is 

forecast due to wide amplitude vibration during 

running, the mounting methods as illustrated in Fig. 4 

are available. 

[a] Use JIS B 1181 Class-3 

thin type nut as double 

nut for tightening. 

Fig. 4 

[b] Use a specific washer 

with standard nut. 

(5) The stud is subjected to bending stress and tensile 

force arising from bearing load. Tighten the stud screws 

with tightening torque which does not exceed the 

torque value specified in applicable Dimension Table. 

Too tight tightening torque could result in rupture 

of the threaded portion. 

(6) A hole is provided on the stud center at right angle to 

the shaft axial center, as illustrated in Fig. 5. Use this 

hole for locking or grease replenishment. 

Fig. 5 

(7) For mounting and adjusting the eccentric stud type 

cam follower, follow the sequence given hereunder. 

1. Insert the stud in the mounting hole so that the NTN 

mark (showing oil hole position) locates in relative to 

load acting direction as illustrated in Fig. 3. 

2. Turn the stud using the recessed slot for screwdriver 

on the stud head or the accessory threaded plug with 

hexagon socket, to adjust a clearance from the mating 

contact surface. 

3. After adjustment, tighten the stud nut with specific 

tightening torque described in applicable Dimensions 

Table. 

Lubrication and how to feed and replenish 

grease into the follower 

Lubrication 

The cam follower type with synthetic rubber seal (with 

tail code LL) and the full-complement roller type are prefilled 

up with lithium soap base grease so they can be 

used in the operating temperature range of -25 to 

+100˚C. 

The type with cage and with no seal is not filled up with 

grease. If a grease pre-filled type is needed, feel free to 

contact NTN. 

Further, NTN Bearings with Solid Drease using solid 

lubricant of less leakage is also available on request. Feel 

free to contact NTN for the detailed information. 

The outer ring outer surface of bearing and the 

track surface must both be lubricated. Failure to 

lubricate could result earlier in damage of bearing. 

How to feed and replenish grease 

Feed and replenish grease through a grease nipple 

provided on the flange end face or threaded-side end 

face of the stud. In this case, plug the grease-feed hole 

or the tapped hole at non-greasing side (with a specialpurposed 

plug or a threaded plug with hexagon socket.) 

These grease nipple and plug are enclosed in each 

cam follower package. Screw-in them in specific position 

before mounting the cam follower. 

Special grease nipple and that specified in JIS 

Standard as applicable are available for use. The 

dimensions thereof and the applicable bearing types are 

as specified in Tables 3 and 4 respectively. 

Furthermore, special press-fit type plug and threaded 

plug with hexagon socket are available for use. The 

dimensions thereof and the applicable bearing types are 

as specified in Tables 5-1, -2 and Table 6 respectively. 

When using the special-purposed press-fit plug, pressfit 

it in the grease feed hole using a mandrel of applicable 

dimension shown in Table 7. 

L1 

L 

d 

D 

Table 3 Grease nipple dimension 

Nominal 

nipple 

number 

NIP-B3 

NIP-B4 

NIP-B6 

NIP-B8 

Dimension 

mm 

d D L L1 

3 

4 

6 

8 

7.5 

7.5 

8 

10 

9 

10 

13 

16 

5.5 

5.5 

6 

7 

NTN cam follower is generally stud-mounted so 

that non-uniform load (bias load) could act on the 

bearing, inversely affected by fitting loose arising 

from continuous running. 

So, good care must be exercised of fitting loose 

for stable running of an equipment. 

(Hexagon 

width across 

flats) 

B 

d 

H 

r L 

Nominal 

nipple 

number 

NIP-X30 

JIS A-M6F 

JIS A-PT1/8 

Dimension 

mm 

d H R L B 

M40.7 

M60.75 

PT1/8 

13.9 

13.5 

20 

4 

4 

8 

5 

5.4 

9.5 

7 

7 

10 

B-179


NTN 

Table 4 Grease nipple applied bearing types and grease nipple dimension codes 

Nominal 

nipple number 

KRKRV 

KRH 

KRVH 

Nipple applied bearing types 

CRV CRVH NUKR NUKRH KRTKRVT NUKRT KRUKRVU NUKRU 

NIP-B3 

 

 

8.8-1 

 

 

 

 

 

 

 

NIP-B4 

1626 

2226 

1018 

1218 

 

 

 

 

 

 

NIP-B6 

3040 

3040 

2044 

2044 

3040 

3040 

 

 

 

 

NIP-B8 

4790 

4790 

4896 

4896 

4790 

4790 

 

 

 

 

NIP-X30 

 

 

 

 

 

 

1626 

 

1626 

 

JIS A-M6F 

 

 

 

 

 

 

3032 

30 

3035 

3035 

JIS A-PT1/8 

 

 

 

 

100180 

(Threaded side) 

100180 

3590 

35180 

4090 

40180 

Special-purposed 

plug 

D 

H 

Table 5-1 Plug dimension 

unit : mm 

Nominal number D H 

SEN 3 3 3 

SEN 4 4 4 

SEN 6 6 6 

SEN 8 8 8 

Threaded plug 

with hexagon socket 

Table 5-2 Plug dimension 

Nominal number d H 

M4X0.7X4R M4X0.7 4 

M6X0.75X6R M6X0.75 6 

PT1/8X7R PT1/8 7 

unit : mm 

Width across 

flatsh 

2 

3 

5 

Table 6 Plug applied bearing types and plug dimension codes 

Plug 

KRKRV 

KRH 

KRVH 

Plug applied bearing types 

CRV CRVH NUKR NUKRH KRTKRVT NUKRT KRUKRVU NUKRU 

SEN3 

 

 

8.8-1 

 

 

 

 

 

 

 

SEN4 

1626 

2226 

1018 

1218 

 

 

 

 

 

 

SEN6 

3040 

3040 

2044 

2044 

3040 

3040 

 

 

 

 

SEN8 

4790 

4790 

4896 

4896 

47180 

4790 

 

 

 

 

M4X0.7X4R 

 

 

 

 

 

 

1626 

 

1626 

 

M6X0.75X6R 

 

 

 

 

 

 

3032 

30 

3035 

3035 

PT1/8X7R 

 

 

 

 

 

100180 

3590 

35180 

4090 

40180 

Da Db 

La 

Plug 

n 

Table 7 Mandrels used for plug press-fitting 

unit : mm 

Grease feed hole dia. Mandrel dimension 

n 0 

0 

Da Db –0.1 La –0.1 

3 

4 

6 

8 

8 

10 

12 

15 

2.8 

3.8 

5.8 

7.8 

1.5 

1.5 

1.5 

2.5 

B-180


NTN 

Track load capacity 

Maximum radial load which is statically allowable on 

the track roller to track contact surface is referred to as 

"track load capacity", and the track load capacity subject 

to track surface hardness HRC40 is as described in 


Where the track surface hardness is other than HRD40, 

adjust the track load capacity using the adjustment factor 

shown in Table 11.1. 

B-181


NTN 

Metric series 

C 

B3 

Type KR 

Type KRLL 

Type KRV 

Type KRVLL 

D 

F n 

R500 

a 

d1 e n G 

G1 

C1 

B2 

B1 

Type KR 

(With cage) 

D 

1052mm 


mm 

D C d1 F B1 B2 G G1 C1 n B3 a e h 

0 

0.050 

10 

7 3 0 4.0 17 9 M 30.5 5 0.5 7 2.5 3) 

0.010 

7 3 4.0 17 9 M 30.5 5 0.5 7 2.5 3) 

12 

13 

16 

19 

22 

26 

30 

32 

35 

40 

47 

52 

8 4 0 4.8 20 11 M 40.7 6 0.5 8.5 2.5 3) 

0.012 

8 4 4.8 20 11 M 40.7 6 0.5 8.5 2.5 3) 

9 5 0 5.75 23 13 M 50.8 7.5 0.5 9.5 3 3) 

0.012 

9 5 5.75 23 13 M 50.8 7.5 0.5 9.5 3 3) 

11 6 0 8 28 16 M 61 8 0.6 4 2) 12 3 

0.012 

11 6 8 28 16 M 61 8 0.6 4 2) 12 3 

11 8 0 10 32 20 M 81.25 10 0.6 4 2) 14 4 

0.015 

11 8 10 32 20 M 81.25 10 0.6 4 2) 14 4 

12 10 0 12 36 23 M101.25 12 0.6 4 17 4 

0.015 

12 10 12 36 23 M101.25 12 0.6 4 17 4 

12 10 0 12 36 23 M101.25 12 0.6 4 17 4 

0.015 

12 10 12 36 23 M101.25 12 0.6 4 17 4 

14 12 0 15 40 25 M121.5 13 0.6 6 6 3 23 6 

0.018 

14 12 15 40 25 M121.5 13 0.6 6 6 3 23 6 

14 12 0 15 40 25 M121.5 13 0.6 6 6 3 23 6 

0.018 

14 12 15 40 25 M121.5 13 0.6 6 6 3 23 6 

18 16 0 18 52 32.5 M161.5 17 0.8 6 8 3 27 6 

0.018 

18 16 18 52 32.5 M161.5 17 0.8 6 8 3 27 6 

20 18 0 22 58 36.5 M181.5 19 0.8 6 8 3 32 6 

0.018 

20 18 22 58 36.5 M181.5 19 0.8 6 8 3 32 6 

24 20 0 25 66 40.5 M201.5 21 0.8 8 9 4 37 8 

0.021 

24 20 25 66 40.5 M201.5 21 0.8 8 9 4 37 8 

24 20 0 25 66 40.5 M201.5 21 0.8 8 9 4 37 8 

0.021 

24 20 25 66 40.5 M201.5 21 0.8 8 9 4 37 8 

Note 1) For bearing with cylindrical outer surface, the nominal number is followed by "X" code. In this case, the cylindrical bearing is manufactured with the tolerance for outer ring 

outer diameter D which conforms to JIS Class-0. Ex. KR22XLL 

2) Grease replenishing hole is provided at front side only (on left side-face in the above sketch). However, in the case with "hexagon hole" no grease replenishing hole is provided. 

B-182


NTN 

h 

Type KRLL 


Type KRV 


Type KRVLL 

(Full complement type with seal) 

Type KRH 

(With hexagonal wrench socket) 

 

Basic load ratings Load ratings of truck Limiting speeds Maximum Bearing Mass Stud 

dynamicstatic dynamic static tightening numbers (approx.) diameter 

N kgf N kgf r /min 

torque 

kg mm 

grease oil Nm kgfm Type NR 1) Type NRLL 1) Spherical Cylindrical Spherical Cylindrical 

Type Type 

Cr Cor Cr Cor outer ring outer ring outer ring outer ring Type KRV Type KRVLL KR KRV 

1 640 1 270 168 130 560 1 360 57 139 27 000 40 000 0.5 0.05 KR10T2H/3A KR10T2LLH 0.005 3 

2 500 2 610 255 267 560 1 360 57 139 25 000 32 000 0.5 0.05 KRV10H KRV10LLH 0.005 3 

2 170 1 690 221 172 725 1 790 74 183 25 000 36 000 1 0.1 KR12T2H/3A KR12T2LLH 0.008 4 

3 500 3 800 360 385 725 1 790 74 183 20 000 27 000 1 0.1 KRV12H KRV12LLH 0.008 4 

2 650 2 260 270 231 805 2 220 82 226 23 000 33 000 2 0.2 KR13T2H/3A KR13T2LLH 0.010 5 

4 500 5 350 455 545 805 2 220 82 226 17 000 22 000 2 0.2 KRV13H KRV13LLH 0.011 5 

4 050 4 200 415 430 1 080 3 400 110 350 19 000 25 000 3 0.3 KR16 KR16LL 0.019 6 

6 500 9 350 665 955 1 080 3 400 110 350 13 000 16 000 3 0.3 KRV16 KRV16LL 0.020 6 

4 750 5 400 480 555 1 380 4 050 141 415 15 000 20 000 8 0.8 KR19 KR19LL 0.031 8 

7 450 11 700 760 1 190 1 380 4 050 141 415 10 000 13 000 8 0.8 KRV19 KRV19LL 0.032 8 

5 300 6 650 540 680 1 690 5 150 172 525 12 000 16 000 14 1.4 KR22 KR22LL 0.046 10 

8 200 14 000 840 1 420 1 690 5 150 172 525 8 500 11 000 14 1.4 KRV22 KRV22LL 0.047 10 

5 300 6 650 540 680 2 120 6 100 216 620 12 000 16 000 14 1.4 KR26 KR26LL 0.059 10 

8 200 14 000 840 1 420 2 120 6 100 216 620 8 500 11 000 14 1.4 KRV26 KRV26LL 0.061 10 

7 850 9 650 800 985 2 620 7 700 267 785 10 000 13 000 20 2 KR30 KR30LL 0.087 12 

12 000 20 300 1 230 2 070 2 620 7 700 267 785 6 500 8 500 20 2 KRV30 KRV30LL 0.089 12 

7 850 9 650 800 985 2 860 8 200 291 835 10 000 13 000 20 2 KR32 KR32LL 0.097 12 

12 000 20 300 1 230 2 070 2 860 8 200 291 835 6 500 8 500 20 2 KRV32 KRV32LL 0.100 12 

12 200 17 900 1 240 1 830 3 200 11 900 325 1 220 8 000 11 000 52 5.3 KR35 KR35LL 0.169 16 

17 600 34 000 1 790 3 500 3 200 11 900 325 1 220 5 500 7 000 52 5.3 KRV35 KRV35LL 0.172 16 

14 000 22 800 1 430 2 330 3 850 14 500 390 1 480 7 000 9 000 76 7.8 KR40 KR40LL 0.248 18 

19 400 42 000 1 980 4 250 3 850 14 500 390 1 480 4 500 6 000 76 7.8 KRV40 KRV40LL 0.252 18 

20 700 33 500 2 110 3 450 4 700 21 000 480 2 150 6 000 8 000 98 10 KR47 KR47LL 0.386 20 

28 800 61 000 2 940 6 250 4 700 21 000 480 2 150 4 000 5 000 98 10 KRV47 KRV47LL 0.390 20 

20 700 33 500 2 110 3 450 5 550 23 300 565 2 370 6 000 8 000 98 10 KR52 KR52LL 0.461 20 

28 800 61 000 2 940 6 250 5 550 23 300 565 2 370 4 000 5 000 98 10 KRV52 KRV52LL 0.465 20 

Note 3) Cam follower with hexagon hole is standard. 

Remarks: For the cam follower with marked seal, the allowable running speed is approximately 10 000 r/min. 

B-183


NTN 

Metric series 

C 

B3 

Type KR 

Type KRLL 

Type KRV 

Type KRVLL 

D 

F n 

R500 

a 

d1 e n G 

G1 

C1 

B2 

B1 

Type KR 

(With cage) 

D 

6290mm 


mm 


0 

0.050 

62 

29 24 0 30 80 49.5 M241.5 25 0.8 8 11 4 44 8 

29 24 0.021 

30 80 49.5 M241.5 25 0.8 8 11 4 44 8 

72 

29 24 0 30 80 49.5 M241.5 25 0.8 8 11 4 44 8 

0.021 

29 24 30 80 49.5 M241.5 25 0.8 8 11 4 44 8 

35 30 0 38 100 63 M301.5 32 1 8 15 4 53 8 

80 

0.021 

35 30 38 100 63 M301.5 32 1 8 15 4 53 8 

0 

85 35 30 0.021 38 100 63 M301.5 32 1 8 15 4 53 8 

35 30 0 38 100 63 M301.5 32 1 8 15 4 53 8 

90 

0.021 

35 30 38 100 63 M301.5 32 1 8 15 4 53 8 

Note 1) For bearing with cylindrical outer surface, the nominal number is followed by "X" code. In this case, the cylindrical bearing is manufactured with the tolerance for outer ring 

outer diameter D which conforms to JIS Class-0. Ex. KR62XLL 

B-184


NTN 

h 

Type KRLL 


Type KRV 


Type KRVLL 

(Full complement type with seal) 

Type KRH 


 

Basic load ratings Load ratings of truck Limiting speeds Maximum Bearing Mass Stud 

dynamicstatic dynamic static tightening numbers (approx.) diameter 

N kgf N kgf r /min 

torque 

kg mm 

grease oil Nm kgfm Type NR 1) Type NRLL 1) Spherical Cylindrical Spherical Cylindrical 

Type Type 

Cr Cor Cr Cor outer ring outer ring outer ring outer ring Type KRV Type KRVLL KR KRV 

28 900 55 000 2 950 5 600 6 950 34 500 710 3 500 5 000 6 500 178 18 KR62 KR62LL 0.790 24 

39 500 98 500 4 000 10 000 6 950 34 500 710 3 500 3 300 4 500 178 18 KRV62 KRV62LL 0.800 24 

28 900 55 000 2 950 5 600 8 050 38 500 820 3 900 5 000 6 500 178 18 KR72 KR72LL 1.04 24 

39 500 98 500 4 000 10 000 8 050 38 500 820 3 900 3 300 4 500 178 18 KRV72 KRV72LL 1.05 24 

45 000 88 500 4 600 9 050 9 800 53 000 1 000 5 400 40 00 5 500 360 37 KR80 KR80LL 1.55 30 

58 000 147 000 5 900 15 000 9 800 53 000 1 000 5 400 2 600 3 500 360 37 KRV80 KRV80LL 1.56 30 

45 000 88 500 4 600 9 050 10 400 56 000 1 060 5 750 4 000 5 500 360 37 KR85 KR85LL 1.74 30 

45 000 88 500 4 600 9 050 11 400 59 000 1 160 6 100 4 000 5 500 360 37 KR90 KR90LL 1.95 30 

58 000 147 000 5 900 15 000 11 400 59 000 1 160 6 100 2 600 3 500 360 37 KRV90 KRV90LL 1.97 30 

. 

B-185

Cam followers stud type truck rollers (With recessed slot for screwdriver use and tapped hole) 

NTN 

Metric series 

Type KRT 

Type KRTX 

Type KRTLL 

Type KRTXLL 

D 

1690mm 

Type KRT 

(With cage) 




mm N kgf 

D 1) C d1 F B1 B2 G G1 C1 e m Cr Cor Cr Cor 

16 11 

0 

6 0.012 8 28 16 M 61 8 0.6 12 M40.7 2) 4 050 4 200 415 430 

19 11 

0 

8 0.015 10 32 20 M 81.25 10 0.6 14 M40.7 2) 4 750 5 400 480 555 

22 12 

0 

10 0.015 12 36 23 M101.25 12 0.6 17 M40.7 5 300 6 650 540 680 

26 12 

0 

10 0.015 12 36 23 M101.25 12 0.6 17 M40.7 5 300 6 650 540 680 

30 14 

0 

12 0.018 15 40 25 M121.5 13 0.6 23 M60.75 7 850 9 650 800 985 

32 14 

0 

12 0.018 15 40 25 M121.5 13 0.6 23 M60.75 7 850 9 650 800 985 

35 18 

0 

16 0.018 18 52 32.5 M161.5 17 0.8 27 PT!/8 12 200 17 900 1 240 1 830 

40 20 

0 

18 0.018 22 58 36.5 M181.5 19 0.8 32 PT!/8 14 000 22 800 1 430 2 330 

47 24 

0 

20 0.021 25 66 40.5 M201.5 21 0.8 37 PT!/8 20 700 33 500 2 110 3 450 

52 24 

0 

20 0.021 25 66 40.5 M201.5 21 0.8 37 PT!/8 20 700 33 500 2 110 3 450 

62 29 

0 

24 0.021 30 80 49.5 M241.5 25 0.8 44 PT!/8 28 900 55 000 2 950 5 600 

72 29 

0 

24 0.021 30 80 49.5 M241.5 25 0.8 44 PT!/8 28 900 55 000 2 950 5 600 

80 35 

0 

30 0.021 38 100 63 M301.5 32 1 53 PT!/8 45 000 88 500 4 600 9 050 

85 35 

0 

30 0.021 38 100 63 M301.5 32 1 53 PT!/8 45 000 88 500 4 600 9 050 

90 35 

0 

30 0.021 38 100 63 M301.5 32 1 53 PT!/8 45 000 88 500 4 600 9 050 

Note 1) The dimensional tolerances for the outer ring outer diameter D of Type KRTX and KRTXLL with cylindrical outer surface conform to JIS Class -0. 

2) A tapped hole is provided at front side only (on left end-face in the above sketch). 

B-186


NTN 

Accessories 

Nominal 

number of 

applied bearing 

Nominal No. 

of 

grease nipple 

Nominal No. of 

threaded plug with 

hexagon socket 


applied hexagon nut 

3035 JIS A-M6F M60.756R 1M121.51M161.5 

40180 JIS A-PT!/8 PT!/87R 1M181.51M643 

Table 3 on B-179 and Table 5-2 on B-180 shows the respective 

boundary dimensions of grease nipple and threaded plug with 

hexagon socket. 

Type KRLL 

(with cage, sealed type) 

Load ratings of truck Limiting speeds Maximum Bearing numbers Mass Stud 

tightening torque 

diameter 

N kgf r/min Nm kgfm Without seal With seal kg mm 

grease oil 

Spherical Cylindrical Spherical Cylindrical 

Cylindrical Spherical Cylindrical Spherical 

outer ring outer ring outer ring outer ring outer ring outer ring outer ring outer ring (approx.) 

1 080 3 400 110 350 19 000 25 000 3 0.3 KRT16 KRT16X KRT16LL KRT16XLL 0.019 6 




2 620 7 700 267 785 10 000 13 000 20 2 KRT30 KRT30X KRT30LL KRT30XLL 0.087 12 

2 860 8 200 291 835 10 000 13 000 20 2 KRT32 KRT32X KRT32LL KRT32XLL 0.097 12 

3 200 11 900 325 1 220 8 000 11 000 52 5.3 KRT35 KRT35X KRT35LL KRT35XLL 0.169 16 

3 850 14 500 390 1 480 7 000 9 000 76 7.8 KRT40 KRT40X KRT40LL KRT40XLL 0.248 18 

4 700 21 000 480 2 150 6 000 8 000 98 10 KRT47 KRT47X KRT47LL KRT47XLL 0.386 20 




9 800 53 000 1 000 5 400 4 000 5 500 360 37 KRT80 KRT80X KRT80LL KRT80XLL 1.55 30 



Remarks: The allowable running speed of Type KRTLL and KRTXLL with marked seal is approximately 10 000r/min. 

B-187


NTN 

Metric series 

Type KRT 

Type RTX 

Type KRTLL 

Type KRTXLL 

Type KRV 

(Full-complement roller type) 

D 

1690mm 




mm N kgf 

D 1) C d1 F B1 B2 G G1 C1 e m Cr Cor Cr Cor 

16 11 

0 

6 0.012 8 28 16 M 61 8 0.6 12 M40.7 2) 6 500 9 350 665 955 

19 11 

0 

8 0.015 10 32 20 M 81.25 10 0.6 14 M40.7 2) 7 450 11 700 760 1 190 

22 12 

0 

10 0.015 12 36 23 M101.25 12 0.6 17 M40.7 8 200 14 000 840 1 420 

26 12 

0 

10 0.015 12 36 23 M101.25 12 0.6 17 M40.7 8 200 14 000 840 1 420 

30 14 

0 

12 0.018 15 40 25 M121.5 13 0.6 23 M60.75 12 000 20 300 1 230 2 070 

32 14 

0 

12 0.018 15 40 25 M121.5 13 0.6 23 M60.75 12 000 20 300 1 230 2 070 

35 18 

0 

16 0.018 18 52 32.5 M161.5 17 0.8 27 PT!/8 17 600 34 000 1 790 3 500 

40 20 

0 

18 0.018 22 58 36.5 M181.5 19 0.8 32 PT!/8 19 400 42 000 1 980 4 250 

47 24 

0 

20 0.021 25 66 40.5 M201.5 21 0.8 37 PT!/8 28 800 61 000 2 940 6 250 

52 24 

0 

20 0.021 25 66 40.5 M201.5 21 0.8 37 PT!/8 28 800 61 000 2 940 6 250 

62 29 

0 

24 0.021 30 80 49.5 M241.5 25 0.8 44 PT!/8 39 500 98 500 4 000 10 000 

72 29 

0 

24 0.021 30 80 49.5 M241.5 25 0.8 44 PT!/8 39 500 98 500 4 000 10 000 

80 35 

0 

30 0.021 38 100 63 M301.5 32 1 53 PT!/8 58 000 147 000 5 900 15 000 

90 35 

0 

30 0.021 38 100 63 M301.5 32 1 53 PT!/8 58 000 147 000 5 900 15 000 

Note 1) The dimensional tolerances for the outer ring outer diameter D of Type KRVTX and KRVTXLL with cylindrical outer surface conform to JIS Class-0. 

2) A tapped hole is provided at front side only (on left end-face in the above sketch). 

B-188


NTN 

Accessories 

Nominal 

number of 


Nominal No. 

of 

grease nipple 






3035 JIS A-M6F M60.756R 1M121.51M161.5 

40180 JIS A-PT!/8 PT!/87R 1M181.51M643 




Type KRVTLL 

(Full-complement roller and sealed type) 


tightening torque 

diameter 

N kgf r/min Nm kgfm Without seal With seal kg mm 

grease oil 


Cylindrical Spherical Cylindrical Spherical 

outer ring outer ring outer ring outer ring outer ring outer ring outer ring outer ring (approx.) 

1 080 3 400 110 350 13 000 16 000 3 0.3 KRVT16 KRVT16X KRVT16LL KRVT16XLL 0.020 6 




2 620 7 700 267 785 6 500 8 500 20 2 KRVT30 KRVT30X KRVT30LL KRVT30XLL 0.089 12 

2 860 8 200 291 835 6 500 8 500 20 2 KRVT32 KRVT32X KRVT32LL KRVT32XLL 0.100 12 

3 200 11 900 325 1 220 5 500 7 000 52 5.3 KRVT35 KRVT35X KRVT35LL KRVT35XLL 0.172 16 

3 850 14 500 390 1 480 4 500 6 000 76 7.8 KRVT40 KRVT40X KRVT40LL KRVT40XLL 0.252 18 

4 700 21 000 480 2 150 4 000 5 000 98 10 KRVT47 KRVT47X KRVT47LL KRVT47XLL 0.390 20 




9 800 53 000 1 000 5 400 2 600 3 500 360 37 KRVT80 KRVT80X KRVT80LL KRVT80XLL 1.56 30 

11 400 59 000 1 160 6 100 2 600 3 500 360 37 KRVT90 KRVT90X KRVT90LL KRVT90XLL 1.97 30 

Remarks: The allowable running speed of Type KRVTLL and KRVTXLL with marked seal is approximately 10 000r/min. 

B-189

Cam followers stud type truck rollersEccentric shaft type 

NTN 

Metric Series 

Type KRU 

Type KRULL 

Type KRVU 

Type KRVULL 

Eccentric 

position 

Eccentric 

position 

Type KRU 

(With cage) 

Type KRULL 


D 

1680mm 




mm N kgf 

D C d1 F B1 B2 G G1 C1 e m E 

0 

0.050 

eccentricity Cr Cor Cr Cor 

16 

19 

22 

26 

30 

32 

35 

40 

47 

52 

62 

72 

80 

11 6 0 8 28 16 M 61 8 0.6 12 M40.7 2) 0.25 4 050 4 200 415 430 

0.012 

11 6 8 28 16 M 61 8 0.6 12 M40.7 2) 0.25 6 500 9 350 665 955 

11 8 0 10 32 20 M 81.25 10 0.6 14 M40.7 2) 0.25 4 750 5 400 480 555 

0.015 

11 8 10 32 20 M 81.25 10 0.6 14 M40.7 2) 0.25 7 450 11 700 760 1 190 

12 10 0 12 36 23 M101.25 12 0.6 17 M40.7 0.3 5 300 6 650 540 680 

0.015 

12 10 12 36 23 M101.25 12 0.6 17 M40.7 0.3 8 200 14 000 840 1 420 

12 10 0 12 36 23 M101.25 12 0.6 17 M40.7 0.3 5 300 6 650 540 680 

0.015 

12 10 12 36 23 M101.25 12 0.6 17 M40.7 0.3 8 200 14 000 840 1 420 

14 12 0 15 40 25 M121.5 13 0.6 23 M60.75 0.4 7 850 9 650 800 985 

0.018 

14 12 15 40 25 M121.5 13 0.6 23 M60.75 0.4 12 000 20 300 1 230 2 070 

14 12 0 15 40 25 M121.5 13 0.6 23 M60.75 0.4 7 850 9 650 800 985 

0.018 

14 12 15 40 25 M121.5 13 0.6 23 M60.75 0.4 12 000 20 300 1 230 2 070 

18 16 0 18 52 32.5 M161.5 17 0.8 27 M60.75 0.5 12 500 18 900 1 280 1 930 

0.018 

18 16 18 52 32.5 M161.5 17 0.8 27 M60.75 0.5 18 000 36 500 1 840 3 700 

20 18 0 22 58 36.5 M181.5 19 0.8 32 PT!/8 0.6 14 000 22 800 1 430 2 330 

0.018 

20 18 22 58 36.5 M181.5 19 0.8 32 PT!/8 0.6 19 400 42 000 1 980 4 250 

24 20 0 25 66 40.5 M201.5 21 0.8 37 PT!/8 0.7 20 700 33 500 2 110 3 450 

0.021 

24 20 25 66 40.5 M201.5 21 0.8 37 PT!/8 0.7 28 800 61 000 2 940 6 250 

24 20 0 25 66 40.5 M201.5 21 0.8 37 PT!/8 0.7 20 700 33 500 2 110 3 450 

0.021 

24 20 25 66 40.5 M201.5 21 0.8 37 PT!/8 0.7 28 800 61 000 2 940 6 250 

29 24 0 30 80 49.5 M241.5 25 0.8 44 PT!/8 0.8 28 900 55 000 2 950 5 600 

0.021 

29 24 30 80 49.5 M241.5 25 0.8 44 PT!/8 0.8 39 500 98 500 4 000 10 000 

29 24 0 30 80 49.5 M241.5 25 0.8 44 PT!/8 0.8 28 900 55 000 2 950 5 600 

0.021 

29 24 30 80 49.5 M241.5 25 0.8 44 PT!/8 0.8 39 500 98 500 4 000 10 000 

35 30 0 38 100 63 M301.5 32 1 53 PT!/8 1.0 45 000 88 500 4 600 9 050 

35 30 0.021 

38 100 63 M301.5 32 1 53 PT!/8 1.0 58 000 147 000 5 900 15 000 

Note 1) For bearing with cylindrical outer surface, the nominal number is followed by “X” code. In this case, the cylindrical bearing is manufactured with the tolerance 

for outer ring outer diameter D which conforms to JIS Class-0. Ex. KRU52XLL 

2) A tapped hole is provided at front side only (on left side-face in the above sketch). 

B-190


NTN 

Eccentric 

position 

Eccentric 

position 

Accessories 

Nominal 

number of 


Nominal No. 

of 

grease nipple 






1626 NIP-X30 M40.7 4R 1M 61 1M101.25 

3035 JIS A-M6F M60.756R 1M121.51M161.5 

4090 JIS A-PT!/8 PT!/87R 1M181.51M301.5 




Type KRVU 


Type KRVULL 



tightening (approx.) diameter 

N kgf r/min 

torque 

kg mm 

Cylindrical Spherical Cylindrical Spherical grease oil Nm kgfm Type KRU 1 Type KRULL 1 Type Type 

outer ring outer ring outer ring outer ring Type KRVU Type KRVULL KRU KRVU 

1 080 3 400 110 350 19 000 25 000 3 0.3 KRU16 KRU16LL 0.019 6 

1 080 3 400 110 350 13 000 16 000 3 0.3 KRVU16 KRVU16LL 0.020 6 

1 380 4 050 141 415 15 000 20 000 8 0.8 KRU19 KRU19LL 0.031 8 

1 380 4 050 141 415 10 000 13 000 8 0.8 KRVU19 KRVU19LL 0.032 8 

1 690 5 150 172 525 12 000 16 000 14 1.4 KRU22 KRU22LL 0.046 10 

1 690 5 150 172 525 8 500 11 000 14 1.4 KRVU22 KRVU22LL 0.047 10 

2 120 6 100 216 620 12 000 16 000 14 1.4 KRU26 KRU26LL 0.059 10 

2 120 6 100 216 620 8 500 11 000 14 1.4 KRVU26 KRVU26LL 0.061 10 

2 620 7 700 267 785 10 000 13 000 20 2 KRU30 KRU30LL 0.087 12 

2 620 7 700 267 785 6 500 8 500 20 2 KRVU30 KRVU30LL 0.089 12 

2 860 8 200 291 835 10 000 13 000 20 2 KRU32 KRU32LL 0.097 12 

2 860 8 200 291 835 6 500 8 500 20 2 KRVU32 KRVU32LL 0.100 12 

3 200 11 900 325 1 220 8 000 11 000 52 5.3 KRU35 KRU35LL 0.169 16 

3 200 11 900 325 1 220 5 500 7 000 52 5.3 KRVU35 KRVU35LL 0.172 16 

3 850 14 500 390 1 480 7 000 9 000 76 7.8 KRU40 KRU40LL 0.248 18 

3 850 14 500 390 1 480 4 500 6 000 76 7.8 KRVU40 KRVU40LL 0.252 18 

4 700 21 000 480 2 150 6 000 8 000 98 10 KRU47 KRU47LL 0.386 20 

4 700 21 000 480 2 150 4 000 5 000 98 10 KRVU47 KRVU47LL 0.390 20 

5 550 23 300 565 2 370 6 000 8 000 98 10 KRU52 KRU52LL 0.461 20 

5 550 23 300 565 2 370 4 000 5 000 98 10 KRVU52 KRVU52LL 0.465 20 

6 950 34 500 710 3 500 5 000 6 500 178 18 KRU62 KRU62LL 0.790 24 

6 950 34 500 710 3 500 3 300 4 500 178 18 KRVU62 KRVU62LL 0.800 24 

8 050 38 500 820 3 900 5 000 6 500 178 18 KRU72 KRU72LL 1.04 24 

8 050 38 500 820 3 900 3 300 4 500 178 18 KRVU72 KRVU72LL 1.05 24 

9 800 53 000 1 000 5 400 4 000 5 500 360 37 KRU80 KRU80LL 1.55 30 

9 800 53 000 1 000 5 400 2 600 3 500 360 37 KRVU80 KRVU80LL 1.56 30 


B-191


NTN 

Metric Series 

Type KRU 

Type KRULL 

Type KRVU 

Type KRVULL 

Eccentric 

position 

Eccentric 

position 

Type KRU 

(With cage) 

Type KRULL 


D 

8590mm 




mm N kgf 

D C d1 F B1 B2 G G1 C1 e m E 

0 

0.050 

eccentricity Cr Cor Cr Cor 

0 

85 35 30 0.021 38 100 63 M301.5 32 1 53 PT!/8 1.0 45 000 88 500 4 600 9 050 

90 

35 30 0 38 100 63 M301.5 32 1 53 PT!/8 1.0 45 000 88 500 4 600 9 050 

0.021 

35 30 38 100 63 M301.5 32 1 53 PT!/8 1.0 58 000 147 000 5 900 15 000 


for outer ring outer diameter D which conforms to JIS Class-0. Ex. KRU85XLL 

B-192


NTN 

Eccentric 

position 

Eccentric 

position 

Accessories 

Nominal 

number of 


Nominal No. 

of 

grease nipple 






1626 NIP-X30 M40.7 4R 1M 61 1M101.25 

3035 JIS A-M6F M60.756R 1M121.51M161.5 

4090 JIS A-PT!/8 PT!/87R 1M181.51M301.5 




Type KRVU 


Type KRVULL 



tightening (approx.) diameter 

N kgf r/min 

torque 

kg mm 

Cylindrical Spherical Cylindrical Spherical grease oil Nm kgfm Type KRU 1 Type KRULL 1 Type Type 

outer ring outer ring outer ring outer ring Type KRVU Type KRVULL KRU KRVU 

10 400 56 000 1 060 5 750 4 000 5 500 360 37 KRU85 KRU85LL 1.74 30 

11 400 59 000 1 160 6 100 4 000 5 500 360 37 KRU90 KRU90LL 1.95 30 

11 400 59 000 1 160 6 100 2 600 3 500 360 37 KRVU90 KRVU90LL 1.97 30 

B-193

Cam followers stud type truck rollers (Multi-row cylindrical roller bearings) 

NTN 

Metric Series 

C 

B3 

Type NUKR 

a 

D F n 

R500 

d1 

e 

n G 

G1 

C1 

B2 

Type NUKRD100mm Double row type full 

complement with seal 

B1 

 

D 

30180mm 


mm 

D C d1 F B1 B2 G G1 C1 n m B3 a e h 

0 

0.050 

30 14 

0 

12 0.018 14.5 40 25 M121.5 13 0.6 6 6 3 15 6 

35 18 16 0 

0.018 

19 52 32.5 M161.5 17 0.8 6 8 3 21 6 

40 20 

0 

18 0.018 21.5 58 36.5 M181.5 19 0.8 6 8 3 23 6 

47 24 

0 

20 0.021 25.5 66 40.5 M201.5 21 0.8 8 9 4 27 8 

52 24 

0 

20 0.021 30 66 40.5 M201.5 21 0.8 8 9 4 31 8 

62 29 

0 

24 0.021 35 80 49.5 M241.5 25 0.8 8 11 4 38 8 

72 29 

0 

24 0.021 41.5 80 49.5 M241.5 25 0.8 8 11 4 44 8 

80 35 

0 

30 0.021 47.5 100 63 M301.5 32 1 8 15 4 51 8 

90 35 

0 

30 0.021 47.5 100 63 M301.5 32 1 8 15 4 51 8 

100 43 

0 

36 0.025 48.5 120 74 M361.5 38 1.5 8 PT!/8 53 14 

120 50 

0 

42 0.025 60.5 140 87 M421.5 44 1.5 8 PT!/8 66 14 

140 57 

0 

48 0.025 65 160 100 M481.5 52 1.5 8 PT!/8 72.5 14 

150 60 

0 

52 0.030 75.5 170 107 M521.5 52 1.5 8 PT!/8 85.5 17 

160 63 

0 

56 0.030 80.5 180 113 M563 58 2 8 PT!/8 89.5 17 

170 66 

0 

60 0.030 86 190 120 M603 58 2 8 PT!/8 96.5 17 

180 72 

0 

64 0.030 91.5 200 124 M643 65 2 8 PT!/8 103.5 17 


for outer ring outer diameter D which conforms to JIS Class-0. Ex. NUKR52X 

B-194

Cam followers stud type truck rollers (Multi-row cylindrical roller bearings) 

NTN 

C 

D F n 

R500 

d1 

e 

m 

G 

h 

G1 

C1 

B2 

B1 

Type NUKRD100mm 

Type NUKRH 


Basic load ratings Load ratings of truck Limiting Maximum Bearing Mass Stud 

dynamic static dynamic static speeds tightening numbers (approx.) diameter 

N kgf N kgf r/min 

torque 

kg mm 

grease Nm kgfm 

Spherical Cylindrical Spherical 

Type 

Cr Cor Cr Cor outer ring outer ring outer ring 

Cylindrical 

outer ring 

Type KUKR 1 KUKR 

13 300 13 500 1 360 1 380 2 620 7 700 267 785 6 900 20 2 NUKR 30 0.088 16 

22 300 25 700 2 280 2 620 3 200 11 900 325 1 220 5 500 52 5.3 NUKR 35 0.165 16 

24 100 29 100 2 450 2 970 3 850 14 500 390 1 480 4 700 76 7.8 NUKR 40 0.242 18 

38 500 48 000 3 950 4 900 4 700 21 000 480 2 150 4 000 98 10 NUKR 47 0.380 20 

42 500 57 500 4 350 5 850 5 550 23 300 565 2 370 3 300 98 10 NUKR 52 0.450 20 

56 500 72 500 5 750 7 400 6 950 34 500 710 3 500 2 900 178 18 NUKR 62 0.795 24 

62 000 85 500 6 350 8 700 8 050 38 500 820 3 900 2 400 178 18 NUKR 72 1.01 24 

101 000 151 000 10 300 15 400 9 800 53 000 1 000 5 400 2 100 360 37 NUKR 80 1.54 30 

101 000 151 000 10 300 15 400 11 400 59 000 1 160 6 100 2 100 360 37 NUKR 90 1.96 30 

119 000 167 000 12 100 17 000 13 000 79 000 1 300 8 050 2 000 630 65 NUKR100 3.08 36 

172 000 266 000 17 600 27 100 16 400 113 000 1 670 11 500 1 700 1 020 105 NUKR120 5.17 42 

201 000 294 000 20 500 30 000 20 000 152 000 2 040 15 500 1 500 1 540 160 NUKR140 7.98 48 

258 000 380 000 26 300 39 000 22 000 173 000 2 250 17 600 1 300 1 950 200 NUKR150 9.70 52 

274 000 400 000 27 900 41 000 24 000 194 000 2 450 19 800 1 200 2 480 250 NUKR160 11.7 56 

320 000 475 000 32 500 48 500 26 000 218 000 2 650 22 200 1 100 3 030 310 NUKR170 13.9 60 

365 000 555 000 37 500 56 500 27 900 253 000 2 840 25 800 1 000 3 670 375 NUKR180 17.0 64 

B-195


NTN 

Metric Series 

Type NUKRT 

Type NUKRTX 

D 

30180mm 

Type NUKRT 

(Shielded full-complement roller, double -row cylindrical roller type) 




mm N kgf 

D 1) C d1 F B1 B2 G G1 C1 e m 

Cr Cor Cr Cor 

0 

30 14 12 0.018 14.5 40 25 M121.5 13 0.6 15 M60.75 13 300 13 500 1 360 1 380 

35 18 16 

0 

0.018 19 52 32.5 M161.5 17 0.8 21 PT!/8 22 300 25 700 2 280 2 620 

40 20 18 

0 

0.018 21.5 58 36.5 M181.5 19 0.8 23 PT!/8 24 100 29 100 2 450 2 970 

47 24 20 

0 

0.021 25.5 66 40.5 M201.5 21 0.8 27 PT!/8 38 500 48 000 3 950 4 900 

52 24 20 

0 

0.021 30 66 40.5 M201.5 21 0.8 31 PT!/8 42 500 57 500 4 350 5 850 

62 29 24 

0 

0.021 35 80 49.5 M241.5 25 0.8 38 PT!/8 56 500 72 500 5 750 7 400 

72 29 24 

0 

0.021 41.5 80 49.5 M241.5 25 0.8 44 PT!/8 62 000 85 500 6 350 8 700 

80 35 30 

0 

0.021 47.5 100 63 M301.5 32 1 51 PT!/8 101 000 151 000 10 300 15 400 

90 35 30 

0 

0.021 47.5 100 63 M301.5 32 1 51 PT!/8 101 000 151 000 10 300 15 400 

100 43 36 

0 

0.025 48.5 120 74 M361.5 38 1.5 53 PT!/8 119 000 167 000 12 100 17 000 

120 50 42 

0 

0.025 60.5 140 87 M421.5 44 1.5 66 PT!/8 172 000 266 000 17 600 27 100 

140 57 48 

0 

0.025 65 160 100 M481.5 52 1.5 72.5 PT!/8 201 000 294 000 20 500 30 000 

150 60 52 

0 

0.030 75.5 170 107 M521.5 52 1.5 85.5 PT!/8 258 000 380 000 26 300 39 000 

160 63 56 

0 

0.030 80.5 180 113 M563 58 2 89.5 PT!/8 274 000 400 000 27 900 41 000 

170 66 60 

0 

0.030 86 190 120 M603 58 2 96.5 PT!/8 320 000 475 000 32 500 48 500 

180 72 64 

0 

0.030 91.5 200 124 M643 65 2 103.5 PT!/8 365 000 555 000 37 500 56 500 

Note 1) The dimensional tolerance for the outer ring outer diameter D of Type NUKRTX with cylindrical outer surface conforms to JIS Class-0. 

B-196


NTN 

Accessories 

Nominal 

number of 


Nominal No. 

of 

grease nipple 






30 JIS A-M6F M60.756R 1M121.5 

35180 JIS A-PT!/8 PT!/87R 1M161.51M643 




Load ratings of truck Limiting Maximum Bearing numbers Mass Stud 

speeds tightening torque diameter 

N kgf r/min Nm kgfm kg mm 


Cylindrical Spherical 

outer ring outer ring outer ring outer ring grease outer ring outer ring (approx.) 

2 620 7 700 267 785 6 900 20 2 NUKRT30 NUKRT30X 0.088 12 

3 200 11 900 325 1 220 5 500 52 5.3 NUKRT35 NUKRT35X 0.165 16 

3 850 14 500 390 1 480 4 700 76 7.8 NUKRT40 NUKRT40X 0.242 18 

4 700 21 000 480 2 150 4 000 98 10 NUKRT47 NUKRT47X 0.380 20 

5 550 23 300 565 2 370 3 300 98 10 NUKRT52 NUKRT52X 0.450 20 

6 950 34 500 710 3 500 2 900 178 18 NUKRT62 NUKRT62X 0.795 24 

8 050 38 500 820 3 900 2 400 178 18 NUKRT72 NUKRT72X 1.01 24 

9 800 53 000 1 000 5 400 2 100 360 37 NUKRT80 NUKRT80X 1.54 30 

11 400 59 000 1 160 6 100 2 100 360 37 NUKRT90 NUKRT90X 1.96 30 

13 000 79 000 1 300 8 050 2 000 630 65 NUKRT100 NUKRT100X 3.08 36 

16 400 113 000 1 670 11 500 1 700 1 020 105 NUKRT120 NUKRT120X 5.17 42 

20 000 152 000 2 040 15 500 1 500 1 540 160 NUKRT140 NUKRT140X 7.98 48 

22 000 173 000 2 250 17 600 1 300 1 950 200 NUKRT150 NUKRT150X 9.70 52 

24 000 194 000 2 450 19 800 1 200 2 480 250 NUKRT160 NUKRT160X 11.7 56 

26 000 218 000 2 650 22 200 1 100 3 030 310 NUKRT170 NUKRT170X 13.9 60 

27 900 253 000 2 840 25 800 1 000 3 670 375 NUKRT180 NUKRT180X 17.0 64 

B-197


NTN 

Metric Series 

Type NUKRU 

Type NUKRUX 

D 

30180mm 

Type NUKRU 

(Shielded full-complement roller, double -row cylindrical roller type) 



dynamic static 

mm 

N 

D 1) C d1 F B1 B2 G G1 C1 e m E 

eccentricity Cr Cor 

0 

30 14 12 0.018 14.5 40 25 M121.5 13 0.6 15 M60.75 0.4 13 300 13 500 

35 18 

0 

16 0.018 19 52 32.5 M161.5 17 0.8 21 M60.75 0.5 22 300 25 700 

40 20 

0 

18 0.018 21.5 58 36.5 M181.5 19 0.8 23 PT!/8 0.6 24 100 29 100 

47 24 

0 

20 0.021 25.5 66 40.5 M201.5 21 0.8 27 PT!/8 0.7 38 500 48 000 

52 24 

0 

20 0.021 30 66 40.5 M201.5 21 0.8 31 PT!/8 0.7 42 500 57 500 

62 29 

0 

24 0.021 35 80 49.5 M241.5 25 0.8 38 PT!/8 0.8 56 500 72 500 

72 29 

0 

24 0.021 41.5 80 49.5 M241.5 25 0.8 44 PT!/8 1.0 62 000 85 500 

80 35 

0 

30 0.021 47.5 100 63 M301.5 32 1 51 PT!/8 1.0 101 000 151 000 

90 35 

0 

30 0.021 47.5 100 63 M301.5 32 1 51 PT!/8 1.0 101 000 151 000 

100 43 

0 

36 0.025 48.5 120 74 M361.5 38 1.5 53 PT!/8 1.5 119 000 167 000 

120 50 

0 

42 0.025 60.5 140 87 M421.5 44 1.5 66 PT!/8 1.5 172 000 266 000 

140 57 

0 

48 0.025 65 160 100 M481.5 52 1.5 72.5 PT!/8 2 201 000 294 000 

150 60 

0 

52 0.030 75.5 170 107 M521.5 52 1.5 85.5 PT!/8 2 258 000 380 000 

160 63 

0 

56 0.030 80.5 180 113 M563 58 2 89.5 PT!/8 2 274 000 400 000 

170 66 

0 

60 0.030 86 190 120 M603 58 2 96.5 PT!/8 2.5 320 000 475 000 

180 72 

0 

64 0.030 91.5 200 124 M643 65 2 103.5 PT!/8 2.5 365 000 555 000 

Note 1) The dimensional tolerance for the outer ring outer diameter D of Type NUKRUX with cylindrical outer surface conforms to JIS Class-0. 

B-198


NTN 

Accessories 

Nominal 

number of 


Nominal No. 

of 

grease nipple 






3035 JIS A-M6F M60.756R 1M121.51M161.5 

40180 JIS A-PT!/8 PT!/87R 1M181.51M643 




Basic load ratings Load ratings of truck Limiting Maximum Bearing numbers Mass Stud 

dynamic static speeds tightening torque diameter 

kgf N kgf r/min Nm kgfm kg mm 


Cylindrical Spherical 

Cr Cor outer ring outer ring outer ring outer ring grease outer ring outer ring (approx.) 

1 360 1 380 2 620 7 700 267 785 6 900 20 2 NUKRU30 NUKRU30X 0.088 12 

2 280 2 620 3 200 11 900 325 1 220 5 500 52 5.3 NUKRU35 NUKRU35X 0.165 16 

2 450 2 970 3 850 14 500 390 1 480 4 700 76 7.8 NUKRU40 NUKRU40X 0.242 18 

3 950 4 900 4 700 21 000 480 2 150 4 000 98 10 NUKRU47 NUKRU47X 0.380 20 

4 350 5 850 5 550 23 300 565 2 370 3 300 98 10 NUKRU52 NUKRU52X 0.450 20 

5 750 7 400 6 950 34 500 710 3 500 2 900 178 18 NUKRU62 NUKRU62X 0.795 24 

6 350 8 700 8 050 38 500 820 3 900 2 400 178 18 NUKRU72 NUKRU72X 1.01 24 

10 300 15 400 9 800 53 000 1 000 5 400 2 100 360 37 NUKRU80 NUKRU80X 1.54 30 

10 300 15 400 11 400 59 000 1 160 6 100 2 100 360 37 NUKRU90 NUKRU90X 1.96 30 

12 100 17 000 13 000 79 000 1 300 8 050 2 000 630 65 NUKRU100 NUKRU100X 3.08 36 

17 600 27 100 16 400 113 000 1 670 11 500 1 700 1 020 105 NUKRU120 NUKRU120X 5.17 42 

20 500 30 000 20 000 152 000 2 040 15 500 1 500 1 540 160 NUKRU140 NUKRU140X 7.98 48 

26 300 39 000 22 000 173 000 2 250 17 600 1 300 1 950 200 NUKRU150 NUKRU150X 9.70 52 

27 900 41 000 24 000 194 000 2 450 19 800 1 200 2 480 250 NUKRU160 NUKRU160X 11.7 56 

32 500 48 500 26 000 218 000 2 650 22 200 1 100 3 030 310 NUKRU170 NUKRU170X 13.9 60 

37 500 56 500 27 900 253 000 2 840 25 800 1 000 3 670 375 NUKRU180 NUKRU180X 17.0 64 

B-199


NTN 

Inch series 

Type CRVX 

Type CRVXLL 

Type CR 

(with cage) 

D 

12.700152.400mm 


mm (!/25.4mm) 


0 

0.025 

0 

0.130 

0.025 

0 

12.700(!/2) 

15.875(%/8) 

8.731(!!/32) 4.762() 6 23 12.7 NO-10-32UNF 6.4 0.8 3 2) 10 !/8 

9.525(#/8) 4.762() 6 27 15.9 NO-10-32UNF 6.4 0.8 3 2) 10 !/8 

10.319(!#/32) 6.350(!/4) 8 27.8 15.9 !/4-28UNF 7.9 0.8 4 2) 12.5 !/8 

11.112(&/16) 6.350(!/4) 8 31.8 19.1 !/4-28UNF 7.9 0.8 4 2) 12.5 !/8 

19.050(#/4) 12.700(!/2) 9.525(#/8) 12 36.5 22.2 #/8-24UNF 9.5 0.8 4 6.35 3 16.2 #/16 

22.225(&/8) 12.700(!/2) 9.525(#/8) 12 36.5 22.2 #/8-24UNF 9.5 0.8 4 6.35 3 16.2 #/16 

25.400(1) 15.875(%/8) 11.112(&/16) 13 42.8 25.4 &/16-20UNF 12.7 0.8 4 6.35 3 21 !/4 

28.575(1 !/8) 15.875(%/8) 11.112(&/16) 13 42.8 25.4 &/16-20UNF 12.7 0.8 4 6.35 3 21 !/4 

31.750(1 !/4) 19.050(#/4) 12.700(!/2) 16 52.4 31.8 !/2-20UNF 15.9 0.8 6 7.94 3 25 !/4 

34.925(1 #/8) 19.050(#/4) 12.700(!/2) 16 52.4 31.8 !/2-20UNF 15.9 0.8 6 7.94 3 25 !/4 

38.100(1 !/2) 22.225(&/8) 15.875(%/8) 20 61.9 38.1 %/8-18UNF 19.1 0.8 6 9.53 4 30 %/16 

41.275(1 %/8) 22.225(&/8) 15.875(%/8) 20 61.9 38.1 %/8-18UNF 19.1 0.8 6 9.53 4 30 %/16 

44.450(1 #/4) 25.400(1) 19.050(#/4) 25 71.4 44.4 #/4-16UNF 22.2 0.8 6 11.11 4 36.5 %/16 

47.625(1 &/8) 25.400(1) 19.050(#/4) 25 71.4 44.4 #/4-16UNF 22.2 0.8 6 11.11 4 36.5 %/16 

50.800(2) 31.750(1 !/4) 22.225(&/8) 30 84.1 50.8 &/8-14UNF 25.4 0.8 8 12.7 5 41.5 &/16 

57.150(2 !/4) 31.750(1 !/4) 22.225(&/8) 30 84.1 50.8 &/8-14UNF 25.4 0.8 8 12.7 5 41.5 &/16 

1) For bearing with cylindrical outer surface, the nominal number is followed by "X" code. In this case, the cylindrical bearing is manufactured with the tolerance for 

outer ring outer diameter D which conforms to JIS Class-0. Ex. CR10XLL 

B-200


NTN 

Type CRLL 


Type CRH 

(with hexagon hole) 

Basic load ratings Load ratings of truck Limiting speeds Maximum Bearing numbers Mass 

dynamic static dynamic static tightening (approx.) 


torque 

kg 

Spherical Cylindrical Spherical Cylindrical grease oil Nm kgfm Type Type Type 

Cr Cor Cr Cor outer ring outer ring outer ring outer ring 

CRVX 1) CRVXLL 1) CRVX 

2 820 2 450 287 250 2 090 790 213 81 20 000 28 000 2 0.2 CR8T2 0.009 

2 820 2 450 287 250 2 310 790 235 81 20 000 28 000 2 0.2 CR8-1T2 0.010 

4 050 4 000 415 405 3 000 1 080 310 110 18 000 25 000 4 0.4 CR10 0.020 

4 050 4 000 415 405 3 300 1 080 335 110 18 000 25 000 4 0.4 CR10-1 CR10-1LL 0.022 

5 300 6 650 540 680 4 600 1 380 470 140 13 000 16 000 13 1.3 CR12 CR12LL 0.037 

5 300 6 650 540 680 5 350 1 710 545 174 13 000 16 000 13 1.3 CR14 CR14LL 0.048 

7 250 8 350 740 850 7 400 2 060 755 210 12 000 15 000 18 1.9 CR16 CR16LL 0.087 

7 250 8 350 740 850 8 350 2 430 850 248 12 000 15 000 18 1.9 CR18 CR18LL 0.100 

11 400 15 900 1 160 1 620 11 400 2 840 1 160 290 9 000 13 000 24 2.4 CR20 CR20LL 0.150 

11 400 15 900 1 160 1 620 12 500 3 250 1 280 330 9 000 13 000 24 2.4 CR22 CR22LL 0.166 

13 300 20 100 1 360 2 120 16 300 3 600 1 660 365 7 500 10 000 51 5.2 CR24 CR24LL 0.235 

13 300 20 100 1 360 2 120 17 600 4 050 1 800 410 7 500 10 000 51 5.2 CR26 CR26LL 0.265 

20 700 33 500 2 110 3 450 21 600 4 400 2 200 450 6 000 8 000 92 9.3 CR28 CR28LL 0.375 

20 700 33 500 2 110 3 450 23 200 4 850 2 360 495 6 000 8 000 92 9..3 CR30 CR30LL 0.420 

28 900 55 000 2 950 5 600 31 000 5 300 3 150 540 5 000 6 600 150 15 CR32 CR32LL 0.505 

28 900 55 000 2 950 5 600 35 000 6 200 3 550 635 5 000 6 600 150 15 CR36 CR36LL 0.750 

Note 2) Grease replenishing hole is provided at front side only (on left side-face in the above sketch). However, in the case with "hexagon hole" no grease 

replenishing hole is provided. 


B-201


NTN 

Inch series 

Type CRVX 

Type CRVXLL 

Type CRVX 

(Full-complement roller type) 

D 

12.700152.400mm 


mm (!/25.4mm) 


0 

0.025 

0 

0.130 

+0.025 

0 

12.700(!/2) 

15.875(%/8) 

8.731(!!/32) 4.826() 5.75 23 12.7 NO-10-32UNF 6.4 0.8 3 2) 10 !/8 

9.525(#/8) 4.826() 5.75 27 15.9 NO-10-32UNF 6.4 0.8 3 2) 10 !/8 

10.319(!#/32) 6.350(!/4) 8.11 27.8 15.9 !/4-28UNF 7.9 0.8 4 2) 12.5 !/8 

11.112(&/16) 6.350(!/4) 8.11 31.8 19.1 !/4-28UNF 7.9 0.8 4 2) 12.5 !/8 

19.050(#/4) 12.700(!/2) 9.525(#/8) 11 36.5 22.2 #/8-24UNF 9.5 0.8 4 6.35 3 15.5 #/16 

22.225(&/8) 12.700(!/2) 9.525(#/8) 11 36.5 22.2 #/8-24UNF 9.5 0.8 4 6.35 3 15.5 #/16 

25.400(1) 15.875(%/8) 11.112(&/16) 14 43 25.4 &/16-20UNF 12.7 0.8 4 6.35 3 19.5 !/4 

28.575(1 !/8) 15.875(%/8) 11.112(&/16) 14 43 25.4 &/16-20UNF 12.7 0.8 4 6.35 3 19.5 !/4 

31.750(1 !/4) 19.050(#/4) 12.700(!/2) 18.47 52.4 31.8 !/2-20UNF 15.9 0.8 6 7.94 3 25 !/4 

34.925(1 #/8) 19.050(#/4) 12.700(!/2) 18.47 52.4 31.8 !/2-20UNF 15.9 0.8 6 7.94 3 25 !/4 

38.100(1 !/2) 22.225(&/8) 15.875(%/8) 21 61.9 38.1 %/8-18UNF 19.1 0.8 6 9.53 4 27 %/16 

41.275(1 %/8) 22.225(&/8) 15.875(%/8) 21 61.9 38.1 %/8-18UNF 19.1 0.8 6 9.53 4 27 %/16 

44.450(1 #/4) 25.400(1) 19.050(#/4) 24.65 71.4 44.5 #/4-16UNF 22.2 0.8 6 11.11 4 36.5 %/16 

47.625(1 &/8) 25.400(1) 19.050(#/4) 24.65 71.4 44.5 #/4-16UNF 22.2 0.8 6 11.11 4 36.5 %/16 

50.800(2) 31.750(1 !/4) 22.225(&/8) 26.71 84.1 50.8 &/8-14UNF 25.4 0.8 6 12.7 5 36.5 &/16 

57.150(2 !/4) 31.750(1 !/4) 22.225(&/8) 26.71 84.1 50.8 &/8-14UNF 25.4 0.8 6 12.7 5 36.5 &/16 

63.500(2 !/2) 38.100(1 !/2) 25.400(1) 31.15 96.8 57.2 1-14UNF 28.6 0.8 6 14.29 5 44 !/2 

69.850(2 #/4) 38.100(1 !/2) 25.400(1) 31.15 96.8 57.2 1-14UNF 28.6 0.8 6 14.29 5 44 !/2 

76.200(3) 44.450(1 #/4) 31.750(1 !/4) 36.85 109.5 63.5 1 !/4-12UNF 31.8 0.8 8 15.88 5 53 %/8 

82.550(3 !/4) 44.450(1 #/4) 31.750(1 !/4) 36.85 109.5 63.5 1 !/4-12UNF 31.8 0.8 8 15.88 5 53 %/8 

88.900(3 !/2) 50.800(2) 34.925(1 #/8) 44.5 122.2 69.9 1 #/8-12UNF 34.9 0.8 8 17.46 5 60 %/8 

101.600(4) 57.150(2 !/4) 38.100(1 !/2) 44.5 147.6 88.9 1 !/2-12UNF 38.1 0.8 8 19.05 5 63 #/4 

127.000(5) 69.850(2 #/4) 50.800(2) 68.7 200 128.6 2-12UNF 65.1 0.8 8 22.23 5 89 &/8 

152.400(6) 82.550(3 !/4) 63.500(2 !/2) 81.35 236.6 152.4 2 !/2-12UNF 76.2 0.8 8 25.4 5 110 1 

Note 1) For bearing with spherical outer surface, the nominal number is followed by "X" code. In this case, the spherical bearing (R=500) is manufactured with the 

tolerance 0,-0.05 for the outer ring outer diameter D. 

B-202


NTN 

Type CRVXLL 

(Full-complement roller and sealed type) 

Type CRVH 

(with hexagon hole) 

Basic load ratings Load ratings of truck Limiting speeds Maximum Bearing numbers Mass 

dynamic static dynamic static tightening (approx.) 


torque 

kg 

Spherical Cylindrical Spherical Cylindrical grease oil Nm kgfm Type Type Type 

Cr Cor Cr Cor outer ring outer ring outer ring outer ring 

CRVX 1) CRVXLL 1) CRVX 

3 400 3 750 350 385 2 090 790 213 81 17 000 22 000 2 0.2 CRV8X CRV8XLL 0.010 

3 950 4 550 405 465 2 310 790 235 81 17 000 22 000 2 0.2 CRV8-1X CRV8-1XLL 0.011 

5 550 7 600 565 770 3 000 1 080 310 110 12 000 15 000 4 0.4 CRV10X CRV10XLL 0.020 

6 200 8 700 630 885 3 300 1 080 335 110 12 000 15 000 4 0.4 CRV10-1X CRV10-1XLL 0.022 

8 050 13 300 825 1 360 4 600 1 380 470 140 9 000 11 000 13 1.3 CRV12X CRV12XLL 0.038 

8 050 13 300 825 1 360 5 350 1 710 545 174 9 000 11 000 13 1.3 CRV14X CRV14XLL 0.048 

11 700 18 900 1 190 1 920 7 400 2 060 755 210 7 100 9 200 18 1.9 CRV16X CRV16XLL 0.080 

11 700 18 900 1 190 1 920 8 350 2 430 850 248 7 100 9 200 18 1.9 CRV18X CRV18XLL 0.096 

17 700 35 000 1 810 3 600 11 400 2 840 1 160 290 5 400 7 000 24 2.4 CRV20X CRV20XLL 0.140 

17 700 35 000 1 810 3 600 12 500 3 250 1 280 330 5 400 7 000 24 2.4 CRV22X CRV22XLL 0.165 

21 100 45 500 2 150 4 650 16 300 3 600 1 660 365 4 800 6 200 51 5.2 CRV24X CRV24XLL 0.240 

21 100 45 500 2 150 4 650 17 600 4 050 1 800 410 4 800 6 200 51 5.2 CRV26X CRV26XLL 0.280 

28 400 60 500 2 900 6 150 21 600 4 400 2 200 450 4 100 5 300 92 9.3 CRV28X CRV28XLL 0.400 

28 400 60 500 2 900 6 150 23 200 4 850 2 360 495 4 100 5 300 92 9.3 CRV30X CRV30XLL 0.440 

41 000 87 500 4 200 8 950 31 000 5 300 3 150 540 3 700 4 800 150 15 CRV32X CRV32XLL 0.650 

41 000 87 500 4 200 8 950 35 000 6 200 3 550 635 3 700 4 800 150 15 CRV36X CRV36XLL 0.780 

54 500 119 000 5 600 12 200 44 500 7 200 4 550 735 3 200 4 100 230 23 CRV40X CRV40XLL 1.20 

54 500 119 000 5 600 12 200 49 000 8 250 5 000 840 3 200 4 100 230 23 CRV44X CRV44XLL 1.34 

76 500 177 000 7 800 18 000 64 000 9 150 6 500 935 2 700 3 500 435 45 CRV48X CRV48XLL 1.92 

76 500 177 000 7 800 18 000 69 000 10 000 7 050 1 020 2 700 3 500 435 45 CRV52X CRV52XLL 2.20 

84 500 214 000 8 650 21 800 86 500 11 100 8 800 1 130 2 200 2 800 580 60 CRV56X CRV56XLL 2.92 

106 000 244 000 10 800 24 900 113 000 13 200 11 500 1 350 2 200 2 800 760 78 CRV64X CRV64XLL 4.32 

189 000 520 000 19 300 53 000 165 000 17 900 16 900 1 830 1 500 1 900 1 820 190 CRV80X CRV80XLL 8.80 

260 000 675 000 26 500 68 500 240 000 22 100 24 400 2 250 1 200 1 500 3 550 360 CRV96X CRV96XLL 15.3 

Note 2) Grease replenishing hole is provided at front side only (on left side-face in the above sketch). However, in the case with "hexagon hole" no grease 

replenishing hole is provided. 


B-203

B-204

Thrust Roller Bearings


NTN 

Thrust Roller Bearings 

This thrust roller bearing composed of a thrust roller 

and cage assembly, wherein needle rollers or cylindrical 

rollers are configured radially in the cage, and a bearing 

ring of disc form is intended to support one-directional 

axial load. 

In mounting, it is possible to use a shaft or a housing 

as the direct raceway surface without using the bearing 

ring, whereby design of a low height and lightweight 

compact construction is enabled. 

This type of thrust roller bearing results in slipping on 

raceway surface because theoretically it can’t roll 

perfectly, but in most cases it is practically trouble-free 

and can rotates at comparatively high speed. 

Applied shaft Composition of Nominal 

Bearing type Cage type Remarks 

dia (mm) 

nominal number number 

AXK 

Punched steel 

plate cage 

10120 

AXK 11 04 

High tensile 

brass cage 

130160 

Bore diameter 

code 

Dimension 

series code 

Type code 

AXK1104 

Possible to use in combination with 

AS type bearing ring. 

K811 K812 

Standard type 

Polyamide resin 

cage 

Aluminum alloy 

cage 

Type K811 

10120 

Type K812 

3080 

Type K811 

130160 

Type K812 

85140 

K8 11 10 T2 

Tail code 

Bore diameter 

code 

Dimension 

series code 

Type code 

K81110T2 

Any bearing type with tail code T2, 

that is, with polyamide resin cage 

shall be used at allowable 

temperature 120˚C and, under 

continuous running, at 100˚C and 

less. 

Feel free to contact NTN for the 

detail of the punched steel plate 

cage. 

Possible to use in combination 

with GS and WS bearing rings. 

Punched steel 

plate cage 

1090 

[Tail code] 

T2: resin cage 

JW: Punched steel plate 

cage 

K811 conforms to the Dimension 

Series 11 specified in JIS B 1512. 



K893 

K8 93 10 


cage 

30110 

Bore diameter 

code 

Dimension 

series code 

Type code 

K89310 



B-206


NTN 

Bearing type 

Applied shaft 

dia (mm) 


nominal number 

Nominal 

number 

Remarks 

811 

812 

10160 

8 11 10 T2 

Tail code 

Bore diameter 

code 

Dimension 

series code 

Type code 

[Tail code] 

T2: resin cage 

J: Punched steel plate cage 

81110T2 

Any bearing type with tail code T2, that is, with 

polyamide resin cage shall be used at allowable 

temperature 120˚C and, under continuous 

running, at 100˚C and less. 

WS and GS bearing rings are used in set. 

811 conforms to the Dimension Series 11 

specified in JIS B 1512. 



893 

8 93 10 

30110 

Bore diameter 

code 

Dimension 

series code 

Type code 

89310 

WS and GS bearing rings are used in set. 



AS 

Punched steel 

plate cage 

10130 

AS 11 04 

Bore diameter 

code 

Dimension 

series code 

Type code 

AS1104 

Because of its 1mm thick steel plate ring, this 

thrust bearing needs adequate rigidity and 

profile accuracy of machine parts adjacent to 

the bearing. 

As an individual, on occasion this thrust bearing 

results in slight camber, but it is flattened when 

specific thrust load acts thereon, having no 

problem in practical use. 

WS811 

WS812 

WS8 11 04 

Solid type 

bore guide 

10160 

Bore diameter 

code 

Dimension 

series code 

Type code 

WS81104 

Higher rigidity and higher running accuracy 

than AS bearing ring . 

GS811 

GS812 

GS8 11 04 

Solid type 

outer guide 

10160 

Bore diameter 

code 

Dimension 

series code 

Type code 

GS81104 

Higher rigidity and higher running accuracy 

than AS bearing ring . 

B-207


NTN 


The respective dimensional accuracy, profile accuracy 

and running accuracy of thrust cylindrical roller bearings 

811, 812 and 893 are as shown in Table 4.4 of Section 4 

"Bearing Accuracy" (page A-28). 

The thrust roller and cage assemblies (AXK, K811, 

K812, K893) are machined with dimensional tolerance 

E11 for the bore diameter (De1) (E12 for bearing number 

with T2 code) and with dimensional tolerance c12 for the 

outer diameter (De) of Type AXK and a13 for the 

diameter (De) of K811, K812 and K893. 

Bearing fit in bearing ring 

Table 2 shows the tolerances for fitting of the thrust 

bearing rings (AS, WS and GS) on shaft or in housing. 

Table 2 Bearing ring fit in shaft and housing 

Bearing ring 

Series AS 

Series WS 

Series GS 

Shaft 

h10 

h6 

 

Housing 

H11 

 

H7 

Raceway surface requirements: 

Where the plane portion of a shaft/a housing is used as 

the direct raceway surface of thrust roller and cage 

assembly, the raceway surface must meet the 

requirements specified as a guideline in Table 1. 

Table 1 Raceway surface requirements 


Specified requirements 

Mounting related dimensions 

The dimensions related to fitting of WS and GS bearing 

rings on shaft and in housing are as described in 


The fitting surface of AS bearing ring must be flat and 

have the rigidity sufficient to support thrust load 

throughout its entire surface. 

Perpendicularity (Max) 

IT6 (IT4) 


0.2a 


HRC5864 

Effective hardened layer depth Refer to Formula (7.1) on page A-39. 

Reference : The parenthesized value shall be applied for high running accuracy. 

Cage guiding 

The thrust roller and cage assemblies (AXK, K811, 

K812 and K893) must be guided at either the bore side 

(shaft side) or the outer surface side (housing side) for inrunning 

centering. 

In general, the bore-side guide of low relative speed 

against the cage is mostly used. It should be used 

particularly for high speed running. The dimensional 

tolerances for shaft and housing, when the cage is guided 

thereby, shall be h8 for shaft diameter (bore guide) and 

H9 for housing bore diameter (outer surface guide) 

respectively, which of the guide surface shall be finefinished 

by grinding. 

B-208


NTN 

B-209

Thrust needle roller bearings 

NTN 

Type AXK11 

Type AS11 

Type WS811 

Type GS811 

DW S B 

r 

DCDC1 

Eb Ea 

Dp 

Dp1 

d1 

d 

Type AXK 

(Thrust needle roller 

and cage assy) 

AS bearing ring 

(washer) 

WS bearing ring 

(Inner ring) 

Dc1 

10140mm 




mm 

N kgf 

Dc1 Dc Dw Dp Dp1 S 2) d d1 D D1 B rs min 1) 

E11 c12 0 

-0.01 e13 E12 0.05 -0.2 

-0.5 

+0.5 

+0.2 

Ca Coa Ca Coa 

10 24 2 24 10 1 10 24 24 10 

0 

2.750.060 

0.3 9 150 25 300 935 2 580 

12 26 2 26 12 1 12 26 26 12 

0 

2.750.060 

0.3 9 850 28 900 1 010 2 940 

15 28 2 28 15 1 15 28 28 16 

0 

2.750.060 

0.3 11 300 36 000 1 150 3 700 

17 30 2 30 17 1 17 30 30 18 

0 

2.750.060 

0.3 11 900 39 500 1 220 4 050 

20 35 2 35 20 1 20 35 35 21 

0 

2.750.060 

0.3 13 200 46 500 1 340 4 750 

25 42 2 42 25 1 25 42 42 26 3 

0 

0.060 0.6 14 600 58 000 1 490 5 900 

30 47 2 47 30 1 30 47 47 32 3 

0 

0.060 0.6 16 300 69 500 1 660 7 100 

35 52 2 52 35 1 35 52 52 37 3.5 

0 

0.075 0.6 17 800 81 500 1 820 8 300 

40 60 3 60 40 1 40 60 60 42 3.5 

0 

0.075 0.6 27 400 110 000 2 790 11 300 

45 65 3 65 45 1 45 65 65 47 4 

0 

0.075 0.6 29 800 128 000 3 050 13 100 

50 70 3 70 50 1 50 70 70 52 4 

0 

0.075 0.6 31 500 143 000 3 250 14 500 

55 78 3 78 55 1 55 78 78 57 5 

0 

0.075 0.6 38 000 186 000 3 850 19 000 

60 85 3 85 60 1 60 85 85 62 

0 

4.750.075 

1 44 500 234 000 4 550 23 900 

65 90 3 90 65 1 65 90 90 67 

0 

5.250.075 

1 46 500 254 000 4 750 25 900 

70 95 4 95 70 1 70 95 95 72 

0 

5.250.075 

1 53 500 253 000 5 500 25 800 

75 100 4 100 75 1 75 100 100 77 

0 

5.750.075 

1 55 000 266 000 5 650 27 100 

80 105 4 105 80 1 80 105 105 82 

0 

5.750.075 

1 56 500 279 000 5 750 28 400 

85 110 4 110 85 1 85 110 110 87 

0 

5.750.075 

1 57 500 291 000 5 900 29 700 

90 120 4 120 90 1 90 120 120 92 6.5 

0 

0.090 1 71 000 390 000 7 250 39 500 

100 135 4 135 100 1 100 135 135 102 7 

0 

0.090 1 90 500 550 000 9 200 56 500 

110 145 4 145 110 1 110 145 145 112 7 

0 

0.090 1 93 500 590 000 9 550 60 500 

120 155 4 155 120 1 120 155 155 122 7 

0 

0.090 1 99 000 650 000 10 100 66 500 

130 170 5 170 130 1 130 170 170 132 9 

0 

0.090 1 140 000 900 000 14 300 92 000 

140 180 5 180 140 1 140 178 180 142 9.5 

0 

0.090 1 145 000 960 000 14 800 97 500 


2) Subject to measured thrust load of 20kg or more. 

B-210


NTN 

B 

r 

D 

D1 

GS bearing ring 

(Outer ring) 

Limiting speeds Bearing numbers Reference Mass 

dimensions 

kg 

grease 

r/min mm (approx.) 

thrust needle roller 

oil 

and cage assembly 

washer inner ring outer ring 

WS811 

AXK11 AS11 

Eb Ea GS811 

3 500 14 000 AXK1100 AS1100 WS81100 GS81100 12.3 21.7 0.0028 0.003 0.008 

3 300 13 000 AXK1101 AS1101 WS81101 GS81101 14.3 23.7 0.003 0.0033 0.009 

2 800 11 000 AXK1102 AS1102 WS81102 GS81102 17.2 26.5 0.0035 0.0035 0.01 

2 500 10 000 AXK1103 AS1103 WS81103 GS81103 19.2 28.5 0.004 0.0038 0.011 

2 100 8 500 AXK1104 AS1104 WS81104 GS81104 21.3 31.3 0.005 0.0051 0.014 

1 800 7 000 AXK1105 AS1105 WS81105 GS81105 29.5 39.4 0.007 0.007 0.021 

1 500 6 000 AXK1106 AS1106 WS81106 GS81106 34.5 44.4 0.008 0.008 0.025 

1 400 5 500 AXK1107 AS1107 WS81107 GS81107 39.5 49.4 0.01 0.0091 0.033 

1 200 4 700 AXK1108 AS1108 WS81108 GS81108 44.2 56.2 0.0185 0.0123 0.044 

1 100 4 300 AXK1109 AS1109 WS81109 GS81109 50.5 62.4 0.0205 0.0136 0.055 

1 000 3 900 AXK1110 AS1110 WS81110 GS81110 55.5 67.4 0.0235 0.0148 0.06 

900 3 500 AXK1111 AS1111 WS81111 GS81111 61.0 74.9 0.0308 0.0189 0.095 

800 3 200 AXK1112 AS1112 WS81112 GS81112 66.0 81.9 0.0390 0.0223 0.101 

750 3 000 AXK1113 AS1113 WS81113 GS81113 71.0 86.9 0.04 0.0239 0.125 

750 2 900 AXK1114 AS1114 WS81114 GS81114 75.5 91.4 0.06 0.0254 0.134 

700 2 700 AXK1115 AS1115 WS81115 GS81115 80.5 96.4 0.061 0.027 0.155 

650 2 600 AXK1116 AS1116 WS81116 GS81116 84.4 100.3 0.063 0.0284 0.163 

600 2 400 AXK1117 AS1117 WS81117 GS81117 90.5 106.4 0.0668 0.0301 0.175 

600 2 300 AXK1118 AS1118 WS81118 GS81118 96.5 116.4 0.086 0.0388 0.25 

500 2 000 AXK1120 AS1120 WS81120 GS81120 107.5 131.4 0.112 0.0505 0.35 

480 1 900 AXK1122 AS1122 WS81122 GS81122 115.5 139.4 0.122 0.0549 0.385 

430 1 700 AXK1124 AS1124 WS81124 GS81124 125.5 149.4 0.131 0.0592 0.415 

400 1 600 AXK1126 AS1126 WS81126 GS81126 136.0 164.0 0.205 0.074 0.663 

380 1 500 AXK1128 AS1128 WS81128 GS81128 146.0 174.0 0.219 0.079 0.749 

B-211


NTN 

Type AXK11 

Type AS11 

Type WS811 

Type GS811 

DW S B 

r 

DCDC1 

Eb Ea 

Dp 

Dp1 

d1 

d 

Type AXK 



AS bearing ring 

(washer) 


(Inner ring) 

Dc1 

150160mm 




mm 

N kgf 

Dc1 Dc Dw Dp Dp1 S 2) d d1 D D1 B rs min 1) 

E11 c12 0 

-0.01 e13 E12 0.05 -0.2 

-0.5 

+0.5 

+0.2 

Ca Coa Ca Coa 

150 190 5 190 150 1 150 188 190 152 

0 

9.5 0.090 1 149 000 1 020 000 15 200 104 000 

160 200 5 200 160 1 160 198 200 162 

0 

9.5 0.090 1 154 000 1 070 000 15 700 110 000 


2) Subject to measured thrust load of 20kg or more. 

B-212


NTN 

B 

r 

D 

D1 


(Outer ring) 

Limiting speeds Bearing numbers Reference Mass 

dimensions 

kg 

r/min mm (approx.) 

grease oil thrust needle roller washer inner ring outer ring 

WS811 

AXK11 AS11 

and cage assembly Eb Ea GS811 

350 1 400 AXK1130 AS1130 WS81130 GS81130 156.0 184.2 0.232 0.084 0.796 

330 1 300 AXK1132 AS1132 WS81132 GS81132 166.0 194.2 0.246 0.089 0.842 

B-213

Thrust cylindrical roller bearing 

NTN 

Type 811 

Type 812 

Type 893 

r 

T 

DW 

r 

D D1 

d d1 

Dc Dc1 EbEa 

Type 811 

Type 812 

(Bearing) 

Type 893 

(Bearing) 

Type K811, type K812 



d 

1060mm 




d D d1 D1 T Dc1 2) Dc Dw B rs min 1) grease oil 

0.2 

0.5 

0.5 

0.2 

E11 a13 0 h11 Ca Coa Ca Coa 

0.010 

10 24 24 10 9 10 24 3.5 2.75 0.3 10 800 21 500 1 110 2 190 3 400 13 000 

12 26 26 12 9 12 26 3.5 2.75 0.3 11 500 23 900 1 170 2 430 3 000 12 000 

15 28 28 16 9 15 28 3.5 2.75 0.3 12 900 28 600 1 310 2 920 2 800 11 000 

17 30 30 18 9 17 30 3.5 2.75 0.3 13 400 31 000 1 370 3 150 2 500 10 000 

20 35 35 21 10 20 35 4.5 2.75 0.3 20 200 46 500 2 060 4 700 2 100 8 500 

25 42 42 26 11 25 42 5 3 0.6 27 300 68 000 2 780 6 900 1 800 7 000 

47 47 32 11 30 47 5 3 0.6 27 800 72 500 2 840 7 400 1 500 6 000 

30 52 52 32 16 30 52 7.5 4.25 0.6 53 000 129 000 5 450 13 100 1 500 6 000 

60 60 32 18 30 60 5.5 6.25 1 54 000 166 000 5 500 16 900 1 300 5 000 

52 52 37 12 35 52 5 3.5 0.6 31 000 87 000 3 150 8 900 1 400 5 500 

35 62 62 37 18 35 62 7.5 5.25 1 54 500 139 000 5 550 14 200 1 200 4 900 

68 68 37 20 35 68 6 7 1 66 000 214 000 6 750 21 800 1 200 4 600 

60 60 42 13 40 60 6 3.5 0.6 43 000 121 000 4 350 12 400 1 200 4 800 

40 68 68 42 19 40 68 9 5 1 74 500 190 000 7 600 19 400 1 100 4 400 

78 78 42 22 40 78 7 7.5 1 85 000 277 000 8 700 28 300 1 000 4 000 

65 65 47 14 45 65 6 4 0.6 45 500 135 000 4 650 13 800 1 100 4 400 

45 73 73 47 20 45 73 9 5.5 1 82 000 222 000 8 350 22 600 1 000 4 100 

85 85 47 24 45 85 7.5 8.25 1 102 000 345 000 10 400 35 000 900 3 600 

70 70 52 14 50 70 6 4 0.6 48 000 150 000 4 900 15 300 1 000 4 000 

50 78 78 52 22 50 78 9 6.5 1 85 000 238 000 8 650 24 200 950 3 800 

95 95 52 27 50 95 8 9.5 1.1 125 000 445 000 12 700 45 000 800 3 200 

78 78 57 16 55 78 6 5 0.6 62 500 215 000 6 350 21 900 900 3 600 

55 90 90 57 25 55 90 11 7 1 121 000 340 000 12 300 34 500 830 3 300 

105 105 57 30 55 105 9 10.5 1.1 158 000 570 000 16 100 58 000 730 2 900 

85 85 62 17 60 85 7.5 4.75 1 69 000 215 000 7 000 21 900 830 3 300 

60 95 95 62 26 60 95 11 7.5 1 125 000 365 000 12 800 37 000 780 3 100 

110 110 62 30 60 110 9 10.5 1.1 162 000 600 000 16 500 61 500 680 2 700 


2) The dimensional tolerance for a bearing with a T2 suffix is E12. 

B-214


NTN 

B 

B 

r 

ra 

r 

ra 

d1 

d 

D 

D1 

Db 

da 

Type K893 




(Inner ring) 


(Outer ring) 

Bearing numbers Reference Abutment Mass 

dimensions 

dimensions 

kg 

mm 

mm 

bearing thrust cylindrical roller inner ring outer ring da Db ras 

 

and cage assembly Eb Ea min max max 

 

 

81100T2 K81100T2 WS81100 GS81100 13.5 21.3 21 14 0.3 0.0195 0.0035 0.008 

81101T2 K81101T2 WS81101 GS81101 15.5 23.3 23 16 0.3 0.022 0.004 0.009 

81102T2 K81102T2 WS81102 GS81102 17.2 25.0 25 18 0.3 0.026 0.006 0.010 

81103T2 K81103T2 WS81103 GS81103 19.2 27.0 27 20 0.3 0.030 0.008 0.011 

81104T2 K81104T2 WS81104 GS81104 22.4 32.3 32 23 0.3 0.040 0.012 0.014 

81105T2 K81105T2 WS81105 GS81105 27.6 38.7 39 28 0.6 0.060 0.018 0.021 

81106T2 K81106T2 WS81106 GS81106 33.1 43.9 44 33 0.6 0.070 0.020 0.025 

81206T2 K81206T2 WS81206 GS81206 32.8 49.0 48 33 0.6 0.140 0.050 0.045 

89306 K89306 WS89306 GS89306 34.0 56.4 56 34 1 0.250 0.046 0.100 

81107T2 K81107T2 WS81107 GS81107 38.0 48.9 49 38 0.6 0.090 0.024 0.033 

81207T2 K81207T2 WS81207 GS81207 39.8 56.0 56 41 1 0.235 0.065 0.085 

89307 K89307 WS89307 GS89307 40.0 64.4 64 40 1 0.360 0.064 0.150 

81108T2 K81108T2 WS81108 GS81108 43.2 56.4 56 44 0.6 0.135 0.035 0.044 

81208T2 K81208T2 WS81208 GS81208 43.7 62.9 63 44 1 0.265 0.085 0.090 

89308 K89308 WS89308 GS89308 46.0 74.4 74 46 1 0.520 0.100 0.210 

81109T2 K81109T2 WS81109 GS81109 48.4 61.6 61 49 0.6 0.150 0.040 0.055 

81209T2 K81209T2 WS81209 GS81209 48.8 68.0 68 49 1 0.310 0.100 0.105 

89309 K89309 WS89309 GS89309 50.9 81.3 81 51 1 0.670 0.140 0.270 

81110T2 K81110T2 WS81110 GS81110 53.2 66.4 66 54 0.6 0.165 0.045 0.060 

81210T2 K81210T2 WS81210 GS81210 53.7 73.1 73 54 1 0.385 0.105 0.140 

89310 K89310 WS89310 GS89310 58.0 90.4 90 58 1 0.940 0.180 0.380 

81111T2 K81111T2 WS81111 GS81111 57.8 75.2 75 58 0.6 0.250 0.060 0.095 

81211T2 K81211T2 WS81211 GS81211 60.1 83.4 83 61 1 0.610 0.190 0.210 

89311 K89311 WS89311 GS89311 63.9 100.3 100 64 1 1.270 0.240 0.520 

81112T2 K81112T2 WS81112 GS81112 63.7 80.1 80 65 1 0.285 0.083 0.101 

81212T2 K81212T2 WS81212 GS81212 64.9 88.4 88 66 1 0.660 0.200 0.230 

89312 K89312 WS89312 GS89312 68.9 105.3 105 69 1 1.350 0.250 0.550 

B-215


NTN 

Type 811 

Type 812 

Type 893 

r 

T 

DW 

r 

D D1 

d d1 

Dc Dc1 EbEa 

Type 811 

Type 812 

(Bearing) 

Type 893 

(Bearing) 




d 

65130mm 




d D d1 D1 T Dc1 Dc Dw B rs min 1) grease oil 

0.2 

0.5 

0.5 

0.2 


0.010 

90 90 67 18 65 90 7.5 5.25 1 73 000 236 000 7 400 24 100 780 3 100 

65 100 100 67 27 65 100 11 8 1 130 000 385 000 13 200 39 500 730 2 900 

115 115 67 30 65 115 9 10.5 1.1 166 000 635 000 17 000 64 500 650 2 600 

95 95 72 18 70 95 7.5 5.25 1 76 500 257 000 7 800 26 200 730 2 900 

70 105 105 72 27 70 105 11 8 1 134 000 410 000 13 700 42 000 680 2 700 

125 125 72 34 70 125 10 12 1.1 205 000 790 000 20 900 81 000 600 2 400 

100 100 77 19 75 100 7.5 5.75 1 78 000 268 000 7 950 27 300 680 2 700 

75 110 110 77 27 75 110 11 8 1 138 000 435 000 14 100 44 500 650 2 600 

135 135 77 36 75 135 11 12.5 1.5 239 000 920 000 24 400 94 000 550 2 200 

105 105 82 19 80 105 7.5 5.75 1 79 500 279 000 8 100 28 400 650 2 600 

80 115 115 82 28 80 115 11 8.5 1 142 000 460 000 14 500 47 000 630 2 500 

140 140 82 36 80 140 11 12.5 1.5 246 000 970 000 25 100 98 500 530 2 100 

110 110 87 19 85 110 7.5 5.75 1 83 000 300 000 8 450 30 500 630 2 500 

85 125 125 88 31 85 125 12 9.5 1 169 000 550 000 17 200 56 500 580 2 300 

150 150 88 39 85 150 12 13.5 1.5 281 000 1 100 000 28 600 113 000 500 2 000 

120 120 92 22 90 120 9 6.5 1 112 000 395 000 11 400 40 500 580 2 300 

90 135 135 93 35 90 135 14 10.5 1.1 213 000 680 000 21 700 69 500 530 2 100 

155 155 93 39 90 155 12 13.5 1.5 289 000 1 160 000 29 500 118 000 480 1 900 

135 135 102 25 100 135 11 7 1 158 000 555 000 16 100 57 000 500 2 000 

100 150 150 103 38 100 150 15 11.5 1.1 243 000 795 000 24 800 81 000 480 1 900 

170 170 103 42 100 170 13 14.5 1.5 335 000 1 370 000 34 500 140 000 430 1 700 

145 145 112 25 110 145 11 7 1 165 000 605 000 16 800 61 500 480 1 900 

110 160 160 113 38 110 160 15 11.5 1.1 259 000 885 000 26 400 90 000 450 1 800 

190 190 113 48 110 190 15 16.5 2 430 000 1 770 000 44 000 180 000 400 1 600 

120 

130 

155 155 122 25 120 155 11 7 1 172 000 655 000 17 500 66 500 450 1 800 

170 170 123 39 120 170 15 12 1.1 264 000 930 000 26 900 94 500 430 1 700 

170 170 132 30 130 170 12 9 1 197 000 755 000 20 100 77 000 400 1 600 

190 187 133 45 130 190 19 13 1.5 360 000 1 210 000 36 500 123 000 380 1 500 


2) The dimensional tolerance for a bearing with a T2 suffix is E12. 

B-216


NTN 

B 

B 

r 

ra 

r 

ra 

d1 

d 

D 

D1 

Db 

da 

Type K893 




(Inner ring) 


(Outer ring) 


dimensions 

dimensions 

kg 

mm 

mm 

bearing thrust cylindrical roller inner ring outer ring da Db ras 

 


 

 

81113T2 K81113T2 WS81113 GS81113 68.8 85.2 85 70 1 0.340 0.090 0.125 

81213T2 K81213T2 WS81213 GS81213 69.9 93.3 93 71 1 0.775 0.215 0.280 

89313 K89313 WS89313 GS89313 73.9 110.3 110 74 1 1.430 0.260 0.580 

81114T2 K81114T2 WS81114 GS81114 73.7 90.1 90 74 1 0.365 0.097 0.135 

81214T2 K81214T2 WS81214 GS81214 75.0 98.4 98 76 1 0.815 0.225 0.295 

89314 K89314 WS89314 GS89314 79.8 120.2 120 80 1 1.930 0.340 0.800 

81115T2 K81115T2 WS81115 GS81115 78.7 95.1 95 80 1 0.425 0.115 0.155 

81215T2 K81215T2 WS81215 GS81215 80.1 103.7 103 81 1 0.860 0.240 0.310 

89315 K89315 WS89315 GS89315 84.7 129.2 129 85 1.5 2.410 0.470 0.970 

81116T2 K81116T2 WS81116 GS81116 83.7 100.1 100 85 1 0.445 0.119 0.165 

81216T2 K81216T2 WS81216 GS81216 84.8 108.4 106 86 1 0.950 0.250 0.350 

89316 K89316 WS89316 GS89316 89.8 134.2 134 90 1.5 2.530 0.490 1.020 

81117T2 K81117T2 WS81117 GS81117 88.7 105.3 105 89 1 0.475 0.125 0.175 

81217 K81217 WS81217 GS81217 92.2 116.9 116 92 1 1.280 0.300 0.490 

89317 K89317 WS89317 GS89317 95.8 144.2 144 96 1.5 3.140 0.590 1.280 

81118T2 K81118T2 WS81118 GS81118 94.7 114.3 114 95 1 0.670 0.170 0.250 

81218J K81218J WS81218 GS81218 97.9 126.7 126 97 1 1.820 0.540 0.640 

89318 K89318 WS89318 GS89318 100.8 149.2 149 101 1.5 3.280 0.620 1.330 

81120T2 K81120T2 WS81120 GS81120 105.1 128.7 128 106 1 1.000 0.300 0.350 

81220 K81220 WS81220 GS81220 109.2 140.0 139 109 1 2.240 0.620 0.810 

89320 K89320 WS89320 GS89320 110.6 163.0 163 110 1.5 4.190 0.810 1.690 

81122T2 K81122T2 WS81122 GS81122 115.0 138.8 138 116 1 1.100 0.325 0.385 

81222 K81222 WS81222 GS81222 119.2 150.0 149 119 1 2.450 0.685 0.880 

89322 K89322 WS89322 GS89322 122.5 183.0 183 122 2 6.030 1.150 2.440 

81124T2 K81124T2 WS81124 GS81124 125.0 148.8 148 126 1 1.170 0.340 0.415 

81224 K81224 WS81224 GS81224 129.2 160.0 159 129 1 2.690 0.730 0.980 

81126 K81126 WS81126 GS81126 137.7 162.4 162 137 1 1.740 0.415 0.663 

81226 K81226 WS81226 GS81226 140.1 179.0 173 140 1.5 4.200 1.140 1.530 

B-217


NTN 

Type 811 

Type 812 

r 

T 

DW 

r 

D D1 

d d1 

Dc Dc1 EbEa 

Type 811 

Type 812 

(Bearing) 




d 

140160mm 




d D d1 D1 T Dc1 Dc Dw B rs min 1) grease oil 

140 

0.2 

0.5 

0.5 

0.2 


0.010 

180 178 142 31 140 180 12 9.5 1 206 000 815 000 21 000 83 000 380 1 500 

200 197 143 46 140 200 19 13.5 1.5 370 000 1 280 000 38 000 130 000 350 1 400 

150 190 188 152 31 150 190 12 9.5 1 214 000 870 000 21 800 89 000 350 1 400 

160 200 198 162 31 160 200 12 9.5 1 221 000 930 000 22 600 95 000 330 1 300 


B-218


NTN 

B 

B 

r 

ra 

r 

ra 

d1 

d 

D 

D1 

Db 

da 


(Inner ring) 


(Outer ring) 


dimensions 

dimensions 

kg 

mm 

mm 

bearing thrust cylindrical roller inner ring outer ring da Db ras 

 

 


 

 

81128 K81128 WS81128 GS81128 147.8 172.5 172 147 1 1.950 0.450 0.750 

81228 K81228 WS81228 GS81228 150.1 189.0 188 150 1.5 4.570 1.200 1.690 

81130 K81130 WS81130 GS81130 157.7 182.4 182 157 1 2.070 0.470 0.800 

81132 K81132 WS81132 GS81132 167.8 192.5 192 167 1 2.190 0.500 0.840 

B-219

B-220

COMPONENTS 

Needle Rollers/Snap Rings/Seals


NTN 

Needle Rollers 

NTN needle rollers are all made of high carbon chrome 

bearing steel, fine-finished by grinding and polishing after 

heat-treated, and the hardness thereof ranges from 

HRC60 to 65. These needle rollers are supplied as not 

only rolling element but also pin and shaft individuals. 

Needle roller tolerances 

Any needle rollers are manufactured with dimensional 

accuracy and profile accuracy conforming to JIS B 1506 

(Rollers for Roller Bearings). (Table 2) 

End face profile of needle roller 

F-type needle roller bearing with flat end face is 

standard type, while A-type with round end face is semistandard 

type. In addition to these two types, another 

needle roller type (nominal number with tail code E) 

capable of damping edge load is also available. Feel free 

to contact NTN for the detail thereof. 

Table 2 Needle roller tolerances 


Tolerance for mean value of diameter Dw 

Mutual deviation of diameter Dw 

Roundness of diameter Dw, 

variation in diameter 

Tolerance for length Lw 

Accuracy class 

Tolerance and allowable value 

010 

2 

1.0 (Lw/Dw6) 

1.5 (Lw/Dw6) 

h13 

Class-2 

Unit: m 

Table 1 End face profile 

Type Name Profile 

F 

A 

Flat 

Round 

Composition of nominal code 

The nominal number comprises type code (end face 

profile), dimension code [diameter (Dw)length (Lw)] and 

tail code. 

The needle rollers are delivered contained in same 

package after the mutual deviation of diameter Dw was 

assorted to 2m and less. Before being delivered, the 

needle rollers are identified by label colors such as red, 

dark blue, blue, etc. according to the respective 

dimensional tolerances. 

Further, mixed use of needle rollers contained in 

packages of different label colors is prohibited. 

Table 3 Discrimination of needle rollers 

Label color Dimensional tolerance range m Discrimination 

F 317.8 E 

Tail code 

Dimension code E with crowning 

AS Special heat treatment 

Type code 

applied 

(See Table 1) 

1 

HL Specially surface-finished 

SF Fine surface-finished 

G Polished end face 

Red 

Dark blue 

Blue 

Black 

White 

Gray 

Green 

Brown 

Yellow 

0 2 

1 3 

2 4 

3 5 

4 6 

5 7 

6 8 

7 9 

810 

Standard 

Semistandard 

1) For HL refer to Subsection 11.1 “HL Bearings” on page A-52. 

Fig. 1 

B-222


NTN 

Application of needle rollers 

When composing a full-complement roller type needle 

roller bearing using standard needle rollers, shaft 

diameter (d), housing hole diameter (D), circumferential 

clearance (∆C) 

and radial clearance (∆r) must be determined 

respectively. These can be calculated as follows from 

needle roller diameter (Dw) and number of rollers (Z). 

(Refer to Fig. 2) 

Determine the minimum value of circumferential 

clearance (∆C) using formula (1). And select radial 

clearance (∆r) according to applicable shaft diameter and 

operating conditions, in reference to Table 5.1, as the 

guideline, of 5.1 “Bearing Radial Clearance” (page A- 

30). In general, full-complement roller type bearing needs 

radial clearance larger than that in needle roller and cage 

assembly type roller bearing. 

∆C (0.0050.020) Z mm (minimum value) (1) 

Then, determine the minimum value of housing bore 

diameter (D) and the maximum value of shaft diameter 

(d) using the formulas (2) and (3). 

1 ∆C 

Dw (minimum value) 

 

 

sin () 

⋯⋯⋯⋯⋯(2) 

Z 

dD 2Dw ∆r mm (maximum value)⋯⋯⋯(3) 

D [ 1 ] 

∆C 

Dw 

Number of rollers Z 

d 

∆r 

D 

The maximum value of housing bore diameter (D) 

required to retain needle rollers in a housing by a 

keystone can be determined from the minimum diameter 

value (Dw min) of the roller and the number of rollers using 

formula (4). The coefficient K to be used in that time is as 

shown in Table 4. 

DK Dw min mm (max.) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(4) 

Table 4 Coefficient K value 

Z 

K 

8 

9 

10 

11 

12 

13 

14 

15 

16 

Number of rollers Z 

3.6763333 

3.9709394 

4.2727719 

4.5789545 

4.8879667 

5.1989251 

5.5112799 

5.8246707 

6.1388508 

Dw 

Fig. 3 

Z 

17 

18 

19 

20 

21 

22 

23 

24 

25 

K 

6.4536463 

6.7689303 

7.0846088 

7.4006100 

7.7168786 

8.0333713 

8.3500534 

8.6668970 

8.9838796 

D 

Fig. 2 

B-223


NTN 

Type F 

Type A 

Type F 

Type A 

DW 

1.54.5mm 

Boundary Bearing numbers Mass 

dimensions 

mm 

kg 

per 

Dw Lw flat type disk type 1 000 pcs 


dimensions 

mm 

kg 

per 


1.5 

2 

5.8 F1.5 5.8 A1.5 5.8 0.080 

6.8 F1.5 6.8 A1.5 6.8 0.090 

7.8 F1.5 7.8 A1.5 7.8 0.104 

9.8 F1.5 9.8 A1.5 9.8 0.131 

11.8 F1.511.8 A1.511.8 0.159 

13.8 F1.513.8 A1.513.8 0.186 

6.8 F2 6.8 A2 6.8 0.158 

7.8 F2 7.8 A2 7.8 0.183 

9.8 F2 9.8 A2 9.8 0.232 

11.8 F2 11.8 A2 11.8 0.281 

13.8 F2 13.8 A2 13.8 0.330 

15.8 F2 15.8 A2 15.8 0.379 

17.8 F2 17.8 A2 17.8 0.428 

19.8 F2 19.8 A2 19.8 0.477 

23.8 F3 23.8 A3 23.8 1.34 

3 25.8 F3 25.8 A3 25.8 1.45 

27.8 F3 27.8 A3 27.8 1.56 

11.8 F3.511.8 A3.511.8 0.849 

13.8 F3.513.8 A3.513.8 1.00 

15.8 F3.515.8 A3.515.8 1.15 

17.8 F3.517.8 A3.517.8 1.30 

19.8 F3.519.8 A3.519.8 1.45 

3.5 21.8 F3.521.8 A3.521.8 1.60 

23.8 F3.523.8 A3.523.8 1.75 

25.8 F3.525.8 A3.525.8 1.90 

29.8 F3.529.8 A3.529.8 2.20 

31.8 F3.531.8 A3.531.8 2.35 

34.8 F3.534.8 A3.534.8 2.58 

7.8 F2.5 7.8 A2.5 7.8 0.284 

9.8 F2.5 9.8 A2.5 9.8 0.351 

11.8 F2.511.8 A2.511.8 0.438 

13.8 F2.513.8 A2.513.8 0.514 

2.5 15.8 F2.515.8 A2.515.8 0.591 

17.8 F2.517.8 A2.517.8 0.668 

19.8 F2.519.8 A2.519.8 0.745 

21.8 F2.521.8 A2.521.8 0.821 

23.8 F2.523.8 A2.523.8 0.898 

9.8 F3 9.8 A3 9.8 0.556 

11.8 F3 11.8 A3 11.8 0.671 

13.8 F3 13.8 A3 13.8 0.784 

3 15.8 F3 15.8 A3 15.8 0.897 

17.8 F3 17.8 A3 17.8 1.01 

19.8 F3 19.8 A3 19.8 1.12 

21.8 F3 21.8 A3 21.8 1.23 

13.8 F4 13.8 A4 13.8 1.27 

15.8 F4 15.8 A4 15.8 1.50 

17.8 F4 17.8 A4 17.8 1.70 

19.8 F4 19.8 A4 19.8 1.89 

21.8 F4 21.8 A4 21.8 2.09 

23.8 F4 23.8 A4 23.8 2.26 

4 25.8 F4 25.8 A4 25.8 2.48 

27.8 F4 27.8 A4 27.8 2.68 

29.8 F4 29.8 A4 29.8 2.87 

31.8 F4 31.8 A4 31.8 3.07 

34.8 F4 34.8 A4 34.8 3.31 

37.8 F4 37.8 A4 37.8 3.62 

39.8 F4 39.8 A4 39.8 3.82 

17.8 F4.517.8 A4.517.8 2.11 

4.5 19.8 F4.519.8 A4.519.8 2.36 

21.8 F4.521.8 A4.521.8 2.61 

B-224


NTN 

DW 

4.55mm 


dimensions 

mm 

kg 

per 


4.5 

5 

23.8 F4.523.8 A4.523.8 2.86 

25.8 F4.525.8 A4.525.8 3.11 

29.8 F4.529.8 A4.529.8 3.62 

31.8 F4.531.8 A4.531.8 3.87 

34.8 F4.534.8 A4.534.8 4.25 

37.8 F4.537.8 A4.537.8 4.63 

39.8 F4.539.8 A4.539.8 4.88 

44.8 F4.544.8 A4.544.8 5.51 

19.8 F5 19.8 A5 19.8 2.89 

21.8 F5 21.8 A5 21.8 3.20 

23.8 F5 23.8 A5 23.8 3.52 

25.8 F5 25.8 A5 25.8 3.82 

29.8 F5 29.8 A5 29.8 4.45 

31.8 F5 31.8 A5 31.8 4.74 

34.8 F5 34.8 A5 34.8 5.11 

37.8 F5 37.8 A5 37.8 5.55 

39.8 F5 39.8 A5 39.8 5.85 

49.8 F5 49.8 A5 49.8 7.33 

B-225

Snap rings 

NTN 

Snap Rings 

These snap rings are used exclusively for fixing or 

guiding a needle roller bearing ring or cage in axial 

direction. Furthermore, these snap rings have the profile 

identical to C-type concentric snap ring specified in JIS B 

2806 and, in addition, snap rings with smaller section 

height (b) and also available in smaller dimension range 

are manufactured according to application of needle roller 

bearings. These snap rings are manufactured using hard 

steel wire rod and, after manufactured, chemical 

conversion treatment is applied to the surface thereof. 


The snap ring nominal number is composed of type 

code (WR or BR) and dimension code. The dimension 

code represents applicable shaft diameter in Type WR 

and applicable housing bore diameter in Type BR. 

WR 38 

Types of snap ring 

Two types of snap ring are available; one is Type WR 

designed for application to shaft and another is Type BR 

for application to bearing housing. 

Fig. 3 


Type code 

Allowable running speed 

The allowable running speed for Type WR for shaft 

application is as described in applicable Dimensions 

Table. This means the running speed when snap ring 

begins to get loose with opening of its cut ends. 

Fig. 1 WR snap ring 

Mounting relation 

It is recommended to insert a spacer between snap ring 

and cage for guiding the cage in axial direction. On 

occasion, snap ring is difficult to remove, but limited to a 

portion in which a pull-out 

tool can not be inserted easily. In such a case, it is 

necessary to consider the use of general snap rings 

specified in JIS B 2804 (C-type snap rings) or B 2806 (Ctype 

concentric snap rings). 

Fig. 2 BR snap ring 

Table 1 Cut section angle of snap ring () 

Type Nominal number Cut section angle() 

Type WR WR4WR5 

40 

Type WR6 up to 

60 

Type BR 

All nominal numbers 

90 

B-226

Snap rings 

NTN 

For shaft 

Type WR 

Bearing Boundary dimensions Limiting 

numbers 

speeds 

mm 

r/min 

d1 d3 b s d2 

max 0.06 

WR 4 4 3.7 0.8 0.5 3.8 275 000 

WR 5 5 4.7 1 0.5 4.8 192 000 

WR 6 6 5.6 1.1 0.7 5.7 141 000 

WR 7 7 6.5 1.2 0.7 

0 

6.7 0.09 134 000 

WR 8 8 7.4 1.3 1 7.6 108 000 

WR 9 9 8.4 1.3 1 8.6 80 000 

WR10 10 9.4 1.3 1 9.6 68 000 

WR11 11 10.2 1.3 1 10.5 64 500 

WR12 12 11.2 1.3 1 11.5 53 000 

WR13 13 12.2 1.3 1 12.5 49 600 

WR14 14 13.1 1.5 1.2 13.5 0 45 900 

WR15 15 14 1.75 1.2 

0.11 

14.4 44 500 

WR16 16 15 1.75 1.2 15.4 38 000 

WR17 17 16 1.75 1.2 16.4 34 500 

WR18 18 17 1.75 1.2 17.4 30 000 

WR19 19 17.9 1.75 1.2 18.4 28 900 

WR20 20 18.7 1.75 1.2 19.2 26 200 

WR21 21 19.7 1.75 1.2 20.2 23 400 

WR22 22 20.7 1.75 1.2 21.2 20 800 

WR23 23 21.7 1.75 1.2 22.2 19 500 

WR24 24 22.5 1.75 1.2 23 

0 

0.13 18 100 

WR25 25 23.5 1.75 1.2 24 16 400 

WR26 26 24.5 1.75 1.2 25 14 800 

WR28 28 26.5 2.3 1.5 27 15 400 

WR29 29 27.5 2.3 1.5 28 14 400 

WR30 30 28.5 2.3 1.5 29 13 200 

WR32 32 30.2 2.3 1.5 30.8 

0 

13 300 

WR35 35 33.2 2.3 1.5 33.8 0.16 10 700 


numbers 

speeds 

mm 

r/min 

d1 d3 b s d2 

max 0.06 

WR 37 37 35.2 2.3 1.5 35.8 9 200 

WR 38 38 36.2 2.3 1.5 36.8 8 700 

WR 40 40 37.8 2.3 1.5 38.5 8 100 

WR 42 42 39.8 2.3 1.5 40.5 7 000 

WR 43 43 40.8 2.3 1.5 

0 

41.5 0.16 6 800 

WR 45 45 42.8 2.3 1.5 43.5 5 800 

WR 47 47 44.8 2.3 1.5 45.5 5 500 

WR 48 48 45.8 2.3 1.5 46.5 5 300 

WR 50 50 47.8 2.3 1.5 48.5 4 800 

WR 52 52 49.8 2.3 1.5 50.5 4 300 

WR 55 55 52.6 2.3 1.5 53.5 4 400 

WR 58 58 55.6 2.3 1.5 56.5 3 900 

WR 60 60 57.6 2.3 1.5 58.5 3 500 

WR 61 61 58.6 2.3 1.5 59.5 3 300 

WR 62 62 59.6 2.3 1.5 60.5 3 200 

WR 63 63 60.6 2.3 1.5 61.5 3 100 

WR 64 64 61.6 2.3 1.5 

0 

62.5 

0.19 2 900 

WR 65 65 62.6 2.3 1.5 63.5 2 800 

WR 68 68 65.4 2.8 2 66.2 2 900 

WR 70 70 67.4 2.8 2 68.2 2 700 

WR 72 72 69.4 2.8 2 70.2 2 600 

WR 73 73 70.4 2.8 2 71.2 2 500 

WR 75 75 72.4 2.8 2 73.2 2 300 

WR 80 80 77.4 2.8 2 78.2 1 950 

WR 85 85 82 3.4 2.5 83 2 300 

WR 90 90 87 3.4 2.5 88 

0 

2 000 

WR 95 95 92 3.4 2.5 93 

0.22 

1 750 

WR100 100 97 3.4 2.5 98 1 560 

B-227

Snap rings 

NTN 

For shaft 

Type WR 


numbers 

speeds 

mm 

r/min 

d1 d3 b s d2 

max 0.06 

WR105 105 101.7 3.4 2.5 102.7 1 390 

WR110 110 106.7 3.4 2.5 107.7 0 1 240 

WR115 115 111.7 3.4 2.5 

0.22 

112.7 1 100 

WR120 120 116.7 3.4 2.5 117.7 1 000 

WR125 125 121.7 3.4 2.5 122.7 920 

WR130 130 126.7 3.4 2.5 127.7 830 

WR135 135 131.6 4 2.5 132.4 830 

WR140 140 136.6 4 2.5 137.4 760 

WR145 145 141.6 4 2.5 142.4 690 

WR150 150 146.6 4 2.5 147.4 

0 

640 

WR155 155 151.6 4 2.5 

0.25 

152.4 590 

WR160 160 156.6 4 2.5 157.4 550 

WR165 165 161.6 4 2.5 162.4 500 

WR170 170 166.6 4 2.5 167.4 470 

WR175 175 171.6 4 2.5 172.4 440 

WR180 180 175.6 5 3 177 430 


numbers 

speeds 

mm 

r/min 

d1 d3 b s d2 

max 0.06 

WR270 270 263 7.5 4 265 380 

WR280 280 273 7.5 4 275 360 

WR285 285 278 7.5 4 280 350 

WR290 290 283 7.5 4 285 0 340 

WR300 300 293 7.5 4 295 

0.32 

300 

WR305 305 298 7.5 4 300 290 

WR310 310 303 7.5 4 305 280 

WR320 320 313 7.5 4 315 260 

WR330 330 323 7.5 4 325 240 

WR340 340 333 7.5 4 335 220 

WR350 350 343 7.5 4 345 210 

WR360 360 353 7.5 4 355 

0 

190 

WR370 370 363 7.5 4 365 

0.36 

180 

WR380 380 373 7.5 4 375 170 

WR390 390 383 7.5 4 385 160 

WR400 400 393 7.5 4 395 150 

WR185 185 180.6 5 3 182 590 

WR190 190 185.6 5 3 187 540 

WR195 195 190.6 5 3 192 510 

WR200 200 195.6 5 3 197 480 

WR210 210 205.6 5 3 207 

0 

420 

WR220 220 215.6 5 3 217 0.29 380 

WR225 225 220.6 5 3 222 360 

WR230 230 225.6 5 3 227 350 

WR240 240 235.6 5 3 237 310 

WR250 250 245.6 5 3 247 270 

WR260 260 253 7.5 4 255 

0 

430 

WR265 265 258 7.5 4 260 0.32 410 

B-228

Snap rings 

NTN 

For housing 

Type BR 

Bearing 

numbers 


mm 

Bearing 

numbers 


mm 

d1 d3 b s d2 

min 0.06 

d1 d3 b s d2 

min 0.06 

BR 7 7 7.5 1 0.8 7.3 

BR 8 8 8.5 1 0.8 8.3 

BR 9 9 9.5 1.1 0.8 9.3 

BR10 10 10.6 1.2 0.8 10.4 

BR11 11 11.6 1.3 1 11.4 

BR12 12 12.7 1.3 1 12.4 

BR13 13 13.8 1.3 1 13.5 

BR14 14 14.8 1.3 1 14.5 

BR15 15 15.8 1.3 1 15.5 

BR16 16 16.8 1.6 1.2 16.5 

BR17 17 17.8 1.6 1.2 17.5 

BR18 18 18.9 1.75 1.2 18.5 

BR19 19 19.9 1.75 1.2 19.6 

BR20 20 21 1.75 1.2 20.6 

BR21 21 22 1.75 1.2 21.6 

BR22 22 23 1.75 1.2 22.6 

BR23 23 24 1.75 1.2 23.6 

BR24 24 25.2 1.75 1.2 24.8 

BR25 25 26.2 1.75 1.2 25.8 

BR26 26 27.2 1.75 1.2 26.8 

BR27 27 28.2 1.75 1.2 27.8 

BR28 28 29.2 1.75 1.2 28.8 

BR29 29 30.2 1.75 1.2 29.8 

BR30 30 31.4 2.3 1.5 31 

BR31 31 32.4 2.3 1.5 32 

BR32 32 33.4 2.3 1.5 33 

BR33 33 34.4 2.3 1.5 34 

BR34 34 35.4 2.3 1.5 35 

0.09 

0 

0.11 

0 

0.13 

0 

0.16 

0 

BR35 35 36.4 2.3 1.5 36 

BR36 36 37.8 2.3 1.5 37.2 

BR37 37 38.8 2.3 1.5 38.2 

BR38 38 39.8 2.3 1.5 39.2 

BR39 39 40.8 2.3 1.5 40.2 

BR40 40 41.8 2.3 1.5 41.2 

BR41 41 42.8 2.3 1.5 42.2 

BR42 42 43.8 2.3 1.5 43.2 

BR43 43 44.8 2.3 1.5 44.2 

BR44 44 45.8 2.3 1.5 45.2 

BR45 45 46.8 2.3 1.5 46.2 

BR46 46 47.8 2.3 1.5 47.2 

BR47 47 48.8 2.3 1.5 48.2 

BR48 48 49.8 2.3 1.5 49.2 

BR49 49 50.8 2.3 1.5 50.2 

BR50 50 51.8 2.3 1.5 51.2 

BR52 52 54.3 2.3 1.5 53.5 

BR53 53 55.3 2.3 1.5 54.5 

BR54 54 56.3 2.3 1.5 55.5 

BR55 55 57.3 2.3 1.5 56.5 

BR57 57 59.3 2.3 1.5 58.5 

BR58 58 60.3 2.3 1.5 59.5 

BR60 60 62.3 2.3 1.5 61.5 

BR61 61 63.3 2.3 1.5 62.5 

BR62 62 64.3 2.3 1.5 63.5 

BR63 63 65.3 2.3 1.5 64.5 

BR64 64 66.3 2.3 1.5 65.5 

BR65 65 67.3 2.3 1.5 66.5 

0.16 

0 

0.19 

0 

B-229

Snap rings 

NTN 

For housing 

Type BR 

Bearing 

numbers 


mm 

Bearing 

numbers 


mm 

d1 d3 b s d2 

min 0.06 

d1 d3 b s d2 

min 0.06 

BR 66 66 68.3 2.3 1.5 67.5 

BR 68 68 70.3 2.3 1.5 69.5 

BR 70 70 72.3 2.3 1.5 71.5 

BR 72 72 74.6 2.8 2 73.8 

BR 73 73 75.6 2.8 2 74.8 

BR 74 74 76.6 2.8 2 75.8 

BR 75 75 77.6 2.8 2 76.8 

BR 76 76 78.6 2.8 2 77.8 

BR 77 77 79.6 2.8 2 78.8 

BR 78 78 80.6 2.8 2 79.8 

BR 79 79 81.6 2.8 2 80.8 

BR 81 81 83.6 2.8 2 82.8 

BR 82 82 84.6 2.8 2 83.8 

BR 83 83 85.6 2.8 2 84.8 

BR 85 85 87.6 2.8 2 86.8 

BR 86 86 88.6 2.8 2 87.8 

BR 88 88 91 3.4 2.5 90 

BR 90 90 93 3.4 2.5 92 

BR 92 92 95 3.4 2.5 94 

BR 93 93 96 3.4 2.5 95 

BR 95 95 98 3.4 2.5 97 

BR 97 97 100 3.4 2.5 99 

BR 98 98 101 3.4 2.5 100 

BR100 100 103 3.4 2.5 102 

BR102 102 105.3 3.4 2.5 104.3 

BR103 103 106.3 3.4 2.5 105.3 

BR105 105 108.3 3.4 2.5 107.3 

BR107 107 110.3 3.4 2.5 109.3 

0.19 

0 

0.22 

0 

BR108 108 111.3 3.4 2.5 110.3 

BR110 110 113.3 3.4 2.5 112.3 

BR112 112 115.3 3.4 2.5 114.3 

BR113 113 116.3 3.4 2.5 115.3 

BR115 115 118.3 3.4 2.5 117.3 

BR117 117 120.3 3.4 2.5 119.3 

BR118 118 121.3 3.4 2.5 120.3 

BR120 120 123.3 3.4 2.5 122.3 

BR123 123 126.3 3.4 2.5 125.3 

BR125 125 128.3 3.4 2.5 127.3 

BR127 127 130.3 3.4 2.5 129.3 

BR130 130 133.3 3.4 2.5 132.3 

BR133 133 136.3 3.4 2.5 135.3 

BR135 135 138.3 3.4 2.5 137.3 

BR137 137 140.3 3.4 2.5 139.3 

BR140 140 143.6 4 2.5 142.6 

BR143 143 146.6 4 2.5 145.6 

BR150 150 153.6 4 2.5 152.6 

BR153 153 156.6 4 2.5 155.6 

BR160 160 163.6 4 2.5 162.6 

BR163 163 166.6 4 2.5 165.6 

BR165 165 168.6 4 2.5 167.6 

BR170 170 173.6 4 2.5 172.6 

BR173 173 176.6 4 2.5 175.6 

BR175 175 178.6 4 2.5 177.6 

BR180 180 183.6 4 2.5 182.6 

BR183 183 186.6 4 2.5 185.6 

BR190 190 194.5 5 3 193 

0.22 

0 

0.25 

0 

0.29 

0 

B-230

Snap rings 

NTN 

Bearing 

numbers 


mm 

d1 d3 b s d2 

min 0.06 

BR195 195 199.5 5 3 198 

BR200 200 204.5 5 3 203 

BR205 205 209.5 5 3 208 

BR210 210 214.5 5 3 213 

BR215 215 219.5 5 3 218 

0.29 

0 

BR220 220 224.5 5 3 223 

BR225 225 229.5 5 3 228 

BR230 230 234.5 5 3 233 

BR240 240 244.5 5 3 243 

BR250 250 254.5 5 3 253 

BR260 260 267 7.5 4 265 

BR270 270 277 7.5 4 275 

BR280 280 287 7.5 4 285 

BR300 300 307 7.5 4 305 

0.32 

0 

BR320 320 327 7.5 4 325 

BR325 325 332 7.5 4 330 

BR350 350 357 7.5 4 355 

BR355 355 362 7.5 4 360 

BR360 360 367 7.5 4 365 

BR375 375 382 7.5 4 380 

0.36 

0 

BR380 380 387 7.5 4 385 

BR385 385 392 7.5 4 390 

BR395 395 402 7.5 4 400 

BR400 400 407 7.5 4 405 

BR415 415 422 7.5 4 420 

BR420 420 427 7.5 4 425 

BR440 440 447 7.5 4 445 

0.40 

0 

B-231

Seals 

NTN 

Seals 

Seals 

These are the special-purposed seals for needle roller 

bearings whose cross sectional height is designed so 

small as to match applicable needle roller bearings. 

These contact seals are made of synthetic rubber 

reinforced with steel plate, being then used in operating 

temperature range of -25 to +120˚C and, under 

continuous running, at 100˚C and less. Further, feel free 

to contact NTN for the use of these seals under special 

operating condition, e.g. operating temperature of over 

120˚C. 

Types of seal 

Two different seal types are available; one is Type G 

with one lip and another is Type GD with two lips. In 

addition to these two, sliding rubber seals (LEG, LEGD), 

wherein lubrication property was assigned to a rubber 

material fulfilling low torque under an non-lubrication 

environment, are also manufactured. Feel free to contact 

NTN for the detail of these seal types. 

Fitting relations 

The seal contact surface must be finished by grinding, 

after hardened, to get its good sealing performance. In 

addition, harmful flaw and indent are not allowed to exist 

on the seal contact surface. Where the inner ring raceway 

surface is used as seal contact surface, a wide inner ring 

must be used. 

When fitting a seal in a bearing, it is desirable to taper 

the shaft end face or the housing end face so as to 

protect the seal lip and outer surface from damaging, as 

illustrated in Fig. 4. Where shaft end is not tapered or 

chamfered (rounded), it is recommended to a fitting jig as 

illustrated in Fig.5. Regarding the seal to housing 

interference, a adequate interference can be got in the 

usual housing tolerance range of G7 toR7. 

Furthermore, it is recommended to apply pre-coat 

of a lubricant to the seal lip before fitting seals G and 

GD, for better lubrication. Further, when fitting a seal 

and inserting it through a shaft, take good care to 

protect its lip from deforming. 

30˚ 

Fitting jig 

Fig. 4 

Fig. 5 

Fig. 1 Type G (LEG) 

Fig. 2 Type GD (LEGD) 

Seal application examples 

Figs.6 to 8 illustrate design examples using these seals. 

Where seal contact surface and lubricating condition 

are good, Type G with one lip can be used up to 10m/s 

maximum at peripheral speed and Type GD with two lips 

used up to 6m/s maximum. 

This seal is intended to hold grease and to 

prevent dust invasion from outside. It has no 

function to hold lubrication oil, etc. unlike oil 

seal. 

Fig. 6 


Nominal seal number is composed of type code (G, 

GD) and dimension code (bore dia.outer dia.width). 

Fig. 7 

G 20264 


Type code 

Fig. 3 

Fig. 8 

B-232

Seals 

NTN 

Type G 

Type GD 

Type G 

Type GD 

Bearing numbers Boundary Mass 

dimensions 

mm 10 -3 kg 

d D 1) b 

Type G Type GD +0.2 

0 G GD 

G 4 82 4 8 2 0.18 

G 5 92 5 90.081 

2 0.19 

G 5102 5 

0.023 

10 2 0.22 

G 6102 6 10 2 0.21 

G 6122 6 12 2 0.38 

G 7112 7 11 2 0.25 

G 7142 7 14 2 0.52 

G 8123 8 12 3 0.41 

G 8153 8 15 3 0.74 

G 9133 9 

0.098 

130.028 

3 0.44 

G 9163 9 16 3 0.69 

G10143 10 14 3 0.50 

G10173 10 17 3 0.87 

G12163 12 16 3 0.56 

G12183 12 18 3 0.86 

G12193 12 19 3 0.94 

G13193 13 19 3 0.87 

G14203 GD14203 14 20 3 0.96 0.99 

G14213 GD14213 14 21 3 1.1 1.1 

G14223 GD14223 14 22 3 1.3 1.2 

G15213 GD15213 15 21 3 1.0 1.0 

G15233 GD15233 15 230.119 

0.035 

3 1.3 1.3 

G16223 GD16223 16 22 3 1.3 1.1 

G16243 GD16243 16 24 3 1.3 1.3 

G16253 GD16253 16 25 3 1.6 1.6 

G17233 GD17233 17 23 3 1.3 1.1 

G17253 GD17253 17 25 3 1.5 1.4 

G18243 GD18243 18 24 3 1.2 1.2 


dimensions 

mm 10 -3 kg 

d D 1) b 


0 G GD 

G18264 GD18264 18 26 4 1.8 1.8 

G19274 GD19274 19 27 4 2.0 1.9 

G20264 GD20264 20 26 4 1.8 1.8 

G20284 GD20284 20 

0.119 

280.035 

4 2.1 2.1 

G21294 GD21294 21 29 4 2.2 2.1 

G22284 GD22284 22 28 4 1.8 1.9 

G22304 GD22304 22 30 4 2.2 2.3 

G24324 GD24324 24 32 4 2.5 2.4 

G25324 GD25324 25 32 4 2.3 2.2 

G25334 GD25334 25 33 4 2.5 2.5 

G25354 GD25354 25 35 4 2.6 2.6 

G26344 GD26344 26 34 4 2.6 2.6 

G28354 GD28354 28 35 4 2.4 2.5 

G28374 GD28374 28 37 4 3.1 2.8 

G29374 GD29374 29 37 4 2.7 2.7 

G29384 GD29384 29 38 4 3.2 2.9 

G30374 GD30374 30 

0.143 

370.043 

4 2.7 2.6 

G30404 GD30404 30 40 4 3.6 3.3 

G32424 GD32424 32 42 4 3.7 3.9 

G32454 GD32454 32 45 4 5.1 5.2 

G35424 GD35424 35 42 4 3.0 2.9 

G35454 GD35454 35 45 4 4.1 3.6 

G37474 GD37474 37 47 4 4.0 3.8 

G38484 GD38484 38 48 4 4.4 4.0 

G40474 GD40474 40 47 4 3.3 3.5 

G40504 GD40504 40 50 4 4.6 4.0 

G40525 GD40525 40 520.173 

5 4.8 4.7 

G42524 GD42524 42 

0.053 

52 4 4.7 4.2 

Note 1) The outer diameter tolerance is the mean value of the measured values at two measuring points. 

B-233

Seals 

NTN 

Type G 

Type GD 

Type G 

Type GD 


dimensions 

mm 10 -3 kg 

d D 1) b 


0 G GD 

G43534 GD43534 43 53 4 4.8 4.3 

G45524 GD45524 45 52 4 3.8 3.8 

G45554 GD45554 45 550.173 

0.053 

4 5.2 5.5 

G50584 GD50584 50 58 4 4.5 5.2 

G50625 GD50625 50 62 5 10.4 10 

Note 1) The outer diameter tolerance is the mean value of the measured values at two measuring points. 

B-234

LINEAR BALL BEARINGS: 

Solid, Drawn Cup, Stroke, Linear Flat Roller, and 

Linear Roller Bearing Types

Linear Ball Bearings 

NTN 


 

Type 

Applied shaft 

diameter (mm) 


KLM 

This type composed of an outer ring, 

steel balls and a cage is a cylindrical 

bearing for the most universal 

applications, which ensures precise and 

smooth infinite linear motion due to its 

outer ring of high rigidity. 

340 

KLM 06 L 

Tail code 


diameter 

Type code 

KLMS 

his type is composed of an outer ring, 

steel balls and a cage. And both of the 

outer ring and the cage have an axial slit, 

as illustrated, so as to enable to shrink 

the inscribed circle diameter of the cage 

by pressing the outer ring in radial 

direction from the housing and to thereby 

adjust radial clearance from shaft. 

Thus, this type also ensures precise and 

smooth infinite linear motion. 

1640 

KLM 30 S 

Tail code 


diameter 

Type code 

KLMP 

This type is composed of an outer ring, 

steel balls and a cage. And the outer ring 

and the cage are of arc sectional shape, 

from which one row of balls (equivalent to 

50˚ to 60˚ degree spacing) is removed. 

Thus, the arc cross-sectional ring and 

cage with 50˚ to 60˚ degree opening 

allows the bearing assy to pass through 

a shaft support truss or a shaft support 

stand on midway of the shaft stroke. 

This type also ensures precise and 

smooth infinite linear motion, similarly to 

other types. 

The bearing radial clearance can be also 

adjusted. 

1640 

KLM 30 P LL 

Tail code 

Tail code 


diameter 

Type code 

KH 

This type is composed of an outer ring, 

steel balls and a cage and the outer ring 

is cylindrical similarly to that of Type KLM 

and drawn from a steel plate by precision 

deep drawing, then enabling to design a 

compact bearing construction of low 

section and lightweight. This type also 

ensures precise and smooth infinite linear 

motion similarly to other types. 

650 

With seal 

1050 

KH 20 30 LL 

Tail code 

Width 


diameter 

Type code 

B-236


NTN 

Components 

 

Infinite 

motion 

Finite 

motion 

Rotating 

motion 

Remarks 

Inscribed circle diameter: 6 

L: Single-side seal 

 


S: Clearance-adjustable type 

 

The cages of the bearing types KLM, 

KLM, S, KLM,P and KH are all molded 

from polyamide resin and, therefore, 

these bearing types shall be used at 

allowable temperature 120˚C and, under 

continuous running, at 100˚C and less. 


P: Open type 


 

Furthermore, the operating temperature 

shall be held within the range of -25 to 

100˚C to prevent deterioration of seal 

and grease. 

These bearing types can’t rotate. 


Width: 30 


 

B-237


NTN 

 

Type 

Applied shaft 

diameter (mm) 


KD 

KD 20 32 45 LL 

This type composed of an outer ring, 

steel balls and a cage is a cylindrical 

bearing for the most universal 

applications, which ensures precise and 

smooth infinite linear motion due to its 

outer ring of high rigidity. 


1080 

Tail code 

Width 



diameter 

Type code 

FF 

FFZW 

This type composed of a cage and 

needle rollers ensures smooth 

reciprocating motion of less friction 

actor by being inserted between two 

planes in relative position. The cage 

made of polyamide resin is provided 

with grooved joint at its both ends so 

several cages can be jointed together 

into one unit. 

Roller diameter 

23.5 

FF 25 18 ZW 

Tail code 

Width 


10 

Type code 

BFRF 

This type composed of a cage and 

needle rollers ensures smooth 

reciprocating motion of less friction 

factor by being inserted between two 

planes in relative position. Press-formed 

steel plate cage (BF) and polyamde 

resin cage (RF) are selectively available. 

However, in the case of this bearing type 

several bearings can't not be jointed 

together into one unit. 


37 

BF 30 20 / 1000 

Cage overall 

length 

Width 


10 

Type code 

RLM 

This type is composed of a track frame, 

a separator and rollers. This type has 

the function enabling cylindrical rollers to 

circulate within the track frame and 

ensures infinite linear motion on a plane. 

Section height 

1638 

RLM 26 86 

Bearing overall 

length 

Section height 

Type code 

B-238


NTN 

Components 

 

Infinite 

motion 

Finite 

motion 

Rotating 

motion 

Remarks 


Outer diameter: 32 

Width: 45 

 

The operating temperature shall be held within the range of 

-25 to 100˚C, to prevent deterioration of seal and grease. 

Roller diameter: f2.5 

Width: 18 


 

Due to its resin cage, this bearing shall be used at allowable 

temperature 90˚C and, under continuous running, at 80˚C 

and less. The double-row type has an elastic joint on the cage 

center so double rows of flat rollers can be bent to any 

optional angle along the elastic joint by heating them in oil of 

70 to 90˚C. By cooling down the double-row rollers with the 

bent angle held unchanged for several seconds after having 

bent them to any optional angle, the bent shape of the double 

rows can be held unchanged so that the double-row rollers 

can be mounted on a V-shaped surface as illustrated. 

Roller diameter: f3 

Width: 20 

Cage length: 1000 

 

Where the resin cage RF is used, the bearing shall be used at 

allowable temperature 90˚C and, under continuous running, at 


The standard length of the bearing unit with BF cage is 

1000 mm. 

The standard length of the bearing unit with RF cage is 705 mm. 

Two or more bearings of this type can’t be jointed with each 

other, but it can be supplied at any desired length on request. 

Section height: 26 

Bearing overall length: 86 

 

B-239

Linear Ball Bearings, Solid and Drawn Cup Types 

NTN 

Linear Ball Bearings, Solid and Drawn Cup Types 

Four to nine rows of balls are configured equally in the 

outer ring (outer cylinder). The ball rows circulate in axial 

direction while being guided by the cage. Thus, these 

bearing types move infinitely on a shaft in axial direction. 

However, these bearing types can't rotate. 

Shaft and housing requirements 

Any shaft /housing on/in which these bearing types are 

fitted must meet the requirements specified in Table 2. 

Table 2 Shaft and housing requirements 

Ball row 

Outer ring 



Shaft 

IT3 

Housing 

IT4 


IT2 

IT4 

Surface roughness (max.) 

0.4a 

1.6a 


HRC5864 

 

Hardened layer depth (min) 

0.4mm 

 

Cage 

Dimensional accuracy 

Table 1 Bearing fit 

Type 

series KLM 

Solid type 

series HK 

Drawn-cup type 

Shaft 

g6 (g5) 

h6 (j5) 

Fig. 1 

The respective accuracy of the boundary dimensions , 

inscribed circle diameter (Fw) , outer diameter (D), and 

width (C) of Type KLM (solid type bearing) are as 

described in applicable Dimensions Table. Same bearing 

with higher dimensional accuracy is offerable on special 

request. Feel free to contact NTN when such a bearing is 

needed. 

For Type KH (drawn cup type), its outer ring is so thinwalled 

that it deforms inevitably to some extent in the 

manufacturing processes, particularly heat-treating 

process, but it is so designed as to be restored normally 

from such deformation and fulfill its specific function with 

the required accuracy by being press-fitted in a housing 

with the required dimensional accuracy. 

Feel free to contact NTN for the method of measuring 

the dimensional accurracy. 

Bearing fit 

The use of a shaft or a housing with the dimensional 

tolerance shown in Table 1 would ensure proper radial 

clearance. Where further small radial clearance is 

wanted or preload is applied, the radial clearance is 

adjusted using a split housing or otherwise bearing fit 

required for smaller clearance or preload is selected. 

Housing 

H7 (H6) 

H7 (H6) - steel series - 

K7 (K6) - light metal alloy series - 

Note) The parenthesized data is applied to shaft/housing subjected to higher 

accuracy or of vertical construction. 

How to mount 

The housing for Type KLM (solid type) cant be fixed 

perfectly with interference only and, therefore, must be 

fixed in axial direction using a snap ring. 

On the other hand, Type KH (drawn cup type) needs 

no axial fixing by a snap ring because it is press-fitted in a 

housing with interference. For press-fitting, press the 

outer ring at its stamped mark side(hardened side) using 

a mandrel illustrated in Fig.2. 

A 

B 

Fig. 2 Series KH 

15˚ 

AFw(0.030.04) mm 

BD(0.20.3) mm 

Accessories 

Shafts, shaft support stands and housings exclusive for 

NTN linear ball bearings are also offerable. Feel free to 

contact NTN for the detailed information. 

B-240

Solid type linear ball bearings 

NTN 

Type KLM 

Type KLMS 

Type KLMP 

Type KLMLL 

Type KLMSLL 

Type KLMPLL 

With seal 

FW 

335mm 

Boundary dimensions Basic load ratings Bearing Number Mass 

dynamic static dynamic static numbers of 

ball 

mm N kgf 

rows kg 

Fw D C C1 C2 D1 g h 

0.240 Cr Cor Cr Cor (approx.) 

0 

0 

0 

3 7 10 

0.008 0.010 0.120 51 40 5 4 KLM03 4 0.002 

0 

0 

0 

4 0.008 8 0.010 12 0.120 71 52 7 5.5 KLM04 4 0.003 

0 

0 

0 

5 0.009 10 0.010 15 0.120 118 90 12 9 KLM05 4 0.005 

0 

0 

0 

6 0.009 12 0.010 19 0.120 13.3 1.1 11.5 130 107 13 11 KLM06 4 0.009 

0 

0 

0 15 0.010 17 0.120 11.3 1.1 14.3 116 94 12 9.5 KLM08 4 0.012 

8 0.009 0 

0 

15 0.010 24 0.120 17.3 1.1 14.3 234 187 24 19 KLM08-1 4 0.017 

0 

0 

0 

10 0.009 19 0.012 29 0.120 21.7 1.3 18 435 297 45 30 KLM10 4 0.028 

0 

0 0 

12 0.009 22 0.012 32 0.120 22.7 1.3 21 480 380 49 39 KLM12 5 0.042 

0 

0 

0 

13 0.009 23 0.012 32 0.120 22.7 1.3 22 540 455 55 47 KLM13 5 0.045 

28 37 26.5 1.6 27 875 670 89 68 KLM16 5 0.075 

0 

0 

0 

16 0.009 28 0.012 37 0.120 26.5 1.6 27 0.6 875 670 89 68 KLM16S 5 0.075 

28 37 26.5 1.6 27 8.2 60˚ 875 670 89 68 KLM16P 4 0.062 

32 42 30.3 1.6 30.5 1 190 985 121 100 KLM20 6 0.10 

0 

0 

0 

20 0.010 32 0.014 42 0.120 30.3 1.6 30.5 0.6 1 190 985 121 100 KLM20S 6 0.10 

32 42 30.3 1.6 30.5 8.6 50˚ 1 190 985 121 100 KLM20P 5 0.085 

40 59 40.7 1.85 38 2 640 2 340 269 239 KLM25 6 0.22 

0 

0 

0 

25 0.010 40 0.014 59 0.120 40.7 1.85 38 0.6 2 640 2 340 269 239 KLM25S 6 0.22 

40 59 40.7 1.85 38 10.8 50˚ 2 640 2 340 269 239 KLM25P 5 0.19 

45 64 44.2 1.85 43 2 540 2 360 259 241 KLM30 6 0.26 

0 

0 

0 

30 0.010 45 0.014 64 0.120 44.2 1.85 43 0.6 2 540 2 360 259 241 KLM30S 6 0.26 

45 64 44.2 1.85 43 13.0 50˚ 2 540 2 360 259 241 KLM30P 5 0.22 

52 70 49.2 2.2 49 3 400 2 970 345 305 KLM35 6 0.40 

0 

0 

0 

35 0.012 52 0.017 70 0.120 49.2 2.2 49 1.2 3 400 2 970 345 305 KLM35S 6 0.40 

52 70 49.2 2.2 49 15.1 50˚ 3 400 2 970 345 305 KLM35P 5 0.34 

B-241

Solid type linear ball bearings 

NTN 

Type KLM 

(Standard type) 

Type KLMS 

(Clearance-adjustable type) 

Type KLMP 

(Open type) 

FW 

40mm 

Boundary dimensions Basic load ratings Bearing Number Mass 

dynamic static dynamic static numbers of 

ball 

mm N kgf 

rows kg 

Fw D C C1 C2 D1 g h 

0.300 Cr Cor Cr Cor (approx.) 

0 

0 

60 0.017 800.120 

60.3 2.1 57 3 950 3 750 400 385 KLM40 6 0.62 

40 0 

0 

0 

60 80 

0.012 0.017 0.120 60.3 2.1 57 1.2 3 950 3 750 400 385 KLM40S 6 0.62 

60 0 80 0 

0.017 0.120 

60.3 2.1 57 17.2 50˚ 3 950 3 750 400 385 KLM40P 5 0.53 

B-242

Machined cup linear ball bearings 

NTN 

Type KH 

Type KHLL 

With seal 

FW 

650mm 

Boundary dimensions Bearing Basic load ratings Number of Mass 

numbers dynamic static dynamic static ball rows 

mm N kgf kg 

Fw D C a 1) Cr Cor Cr Cor (approx.) 

6 12 22 4 KH0622 380 225 39 23 4 0.007 

8 15 24 5 KH0824 420 255 43 26 4 0.012 

10 17 26 5 KH1026 480 325 49 33 4 0.015 

12 

19 28 6 KH1228 605 495 62 51 5 0.018 

19 28 6 KH1228LL 605 495 62 51 5 0.018 

14 21 28 6 KH1428 600 505 61 51 5 0.021 

16 

20 

25 

30 

24 30 7 KH1630 775 600 79 61 5 0.027 

24 30 7 KH1630LL 775 600 79 61 5 0.027 

28 30 7 KH2030 1 050 880 107 90 6 0.033 

28 30 7 KH2030LL 1 050 880 107 90 6 0.033 

35 40 8 KH2540 1 930 1 560 197 159 6 0.066 

35 40 8 KH2540LL 1 930 1 560 197 159 6 0.066 

40 50 8 KH3050 2 700 2 450 275 250 7 0.095 

40 50 8 KH3050LL 2 700 2 450 275 250 7 0.095 

40 52 60 9 KH4060 4 250 4 000 435 410 8 0.18 

50 62 70 9 KH5070 5 300 5 700 540 580 9 0.24 

Note 1) Showing a-value from the side face with stamped mark thereon. 

2) Imported product from INA, Germany. 

B-243

Linear ball bearings, stroke type 

NTN 

Linear Ball Bearings, Stroke Type 

The bearing cage with multiple ball rows (several balls 

per row) configured circumferentially therein can move 

within the outer ring in both circumferential and axial 

directions. Thus, this bearing type can rotate and 

reciprocate (but at a limited stroke) on a shaft. 

Bearing construction 

Maximum available length of the reciprocal stroke is 

two times as long as the stroke at which the cage can 

reciprocate within the outer ring. The outer ring is 

provided at its both ends with a snap ring acting as a 

stopper and a wave spring is provided between the snap 

ring and the cage to damp a shock acting on the cage as 

well as to prevent wear of the cage. 

In addition to the standard type, a special type with 

synthetic rubber seal (Tail code: LL) on the both ends of 

its outer ring is also available. 

Dimensional accuracy of Bearing 

Table 1 the bearing tolerance. 


Table 3 specifies the requirements for shaft and 

housing which of the outer surfaces are used as the direct 

raceway. 

Table 3 Shaft and housing requirements 






Hardened layer depth (min) 

How to mount 

Shaft 

IT2 

IT2 

0.2a 

HRC5864 

0.4mm 

Housing 

IT4 

IT4 

1.6a 

 

 

This bearing type can't be fixed perfectly to a housing 

with interference only and, therefore, it is fixed in axial 

direction using a snap ring. (Refer to Fig. 1) 

Table 1 Dimensional accuracy 


Ball inscribed circle diameter (Fw) 

Outer ring outer diameter (D) 

Dimensional tolerance 

F6 

h5 

Bearing fit and radial clearance 

Any linear ball bearings must be used with radial 

clearance as less as possible. Particularly where linear 

ball bearing is applied to a vertical shaft or high accuracy 

is required, it is desirable to select and combine 

appropriate bearing and shaft for securing radial 

clearance in the range of 0 to -10m (by preloading). 

Table 2 shows the bearing fits on shaft and in housing. 

Table 2 Bearing fits 


Usual operating conditions 

Vertical shaft and high accuracy applications 

1 Selective fit 

Shaft 

k5 (m5) 

n5 (p5) 1 

Housing 

H6 (H7) 

J6 (J7) 

Fig. 1 Axial fixing of bearing 

B-244

Linear ball bearings, stroke type 

NTN 

For adjusting the cage so it locates at the outer ring 

center after a shaft was mounted, push the cage in the 

arrow direction in Fig. 2 by inserting the shaft into the 

outer ring that was press-fitted in the housing. (Fig. 2) 

In this condition, insert slowly the shaft up to the center 

point of the reciprocating stroke and, thereafter, further 

push-in the shaft by 1/2 of the stroke. (Fig. 3) Then, 

return the shaft by 1/2 of the stroke to thereby locate the 

cage at the outer ring center and the shaft at the center 

point of the reciprocating stroke. (Fig. 4) 

Fig. 2 

SStroke 

S2 

Fig. 3 

S4 

S4 

Fig. 4 

The outer ring must be press-fitted so its 

grease feed hole locates at load non-acting side. 

Where moment load acts on a bearing due to 

use of a vertical shaft, the load could act on the 

grease feed hole. Caution it. 

B-245

Machined ring linear ball bearings 

NTN 

Type KD 

Type KDLL 

Type KD 

(Open type) 

Type KDLL 

(With seal) 

FW 

1080mm 

Boundary dimensions Bearing numbers Basic load ratings Mass 

mm dynamic static dynamic static (approx.) 

Type KD Type KDLL N kgf kg 

Fw D C 1) T t d1 C1 Max. C1 Max. Type Type 

F6 h5 stroke stroke Type KD Type KDLL Cr Cor Cr Cor KD KDLL 

10 19 30 1.7 0.4 1.5 22.7 27 15.5 19 KD101930 KD101930LL 725 535 74 55 0.028 0.030 

12 23 32 1.7 0.4 1.5 24.5 30 17.1 22 KD122332 KD122332LL 925 725 94 74 0.052 0.055 

16 28 37 1.7 0.5 1.5 29.1 33 21.1 26 KD162837 KD162837LL 1 490 1 070 152 110 0.073 0.078 

20 32 45 2.2 0.5 2 35.8 55 26.8 46 KD203245 KD203245LL 1 680 1 230 171 125 0.100 0.105 

25 37 45 2.2 0.6 2 35.8 55 26.8 46 KD253745 KD253745LL 1 890 1 410 193 144 0.115 0.120 

30 45 65 2.7 0.7 2.5 53.5 81 45.1 73 KD304565 KD304565LL 3 850 3 100 390 315 0.265 0.265 

35 52 70 2.7 0.7 2.5 58.5 90 50.1 79 KD355270 KD355270LL 4 200 3 500 430 355 0.405 0.405 

40 60 80 2.7 0.7 2.5 68.3 103 59.9 93 KD406080 KD406080LL 5 900 4 750 600 485 0.635 0.635 

45 65 80 2.7 0.7 2.5 68.3 103 59.9 93 KD456580 KD456580LL 6 450 5 300 655 540 0.675 0.680 

50 72 100 3.2 1 3 86.4 136 77.4 125 KD5072100 KD5072100LL 8 500 6 850 870 695 1.00 1.02 

55 80 100 3.2 1 3 86.4 136 77.4 125 KD5580100 KD5580100LL 9 250 7 550 945 770 1.34 1.36 

60 85 100 3.2 1 3 86.4 136 77.4 122 KD6085100 KD6085100LL 9 900 8 250 1 010 845 1.41 1.43 

70 95 100 3.2 1 3 86.4 136 77.4 122 KD7095100 KD7095100LL 10 600 9 000 1 090 920 1.61 1.63 

80 110 100 3.2 1.2 3 86 129 77 116 KD80110100 KD80110100LL 13 300 10 900 1 360 1 110 2.37 2.40 

Note 1) The tolerance for dimension-C is 0, -0.120 mm against Fw50 mm and 0, -0.150 mm against Fw50 mm. 

B-246

Machined ring linear ball bearings 

NTN 

B-247

Linear flat rollers 

NTN 

Linear Flat Rollers 

Linear Flat Rollers 

This bearing type composed of a needle roller and flat 

cage assembly (needle rollers are configured in the flat 

cage) ensures smooth reciprocating motion with less 

friction coefficient. 

Types 

For Type FF, the polyamide resin cage has a dovetail 

joint groove on its both ends so that several cages can be 

jointed together into one unit. 

For Type FFZW, two rows of needle rollers are 

configured in the cage and the cage has an elastic joint 

on its center so as to enable to bend two rows of flat 

rollers to any optional angle at the elastic joint by heating 

them in oil of 70 to 90˚C. The two roller rows bent to any 

optional angle can hold the bent shape unchanged, even 

under normal operating temperature, by being cooled 

down for several seconds, with the bending angle held 

unchanged. 

For Type BF, the cage is press-formed from steel plate 

and the standard length of the bearing unit is 1000 mm. 

For Type RF, the cage is of polyamide resin and the 

standard length of the bearing unit is 705 mm. The both 

are unavailable for cage to cage inter-jointing, but a 

bearing unit of any desired length is offerable upon 

request. Feel free to contact NTN for the detailed 

information. 

Needle roller tolerance 

The needle rollers contained in the flat roller cage are 

manufactured within the dimensional tolerance range of 0 

to -2 mm against the nominal diameter (Dw). 

How to mount 

Theoretically the linear flat roller bearing moves by 1/2 

of table moving stroke in same direction as the table 

moving direction. The relationship of bed length (L) - 

stroke (S) - cage length (L1) can be expressed in formula 

(1). (Fig. 2) 

LS2L 

1 

L1 

L 

Fig. 2 

The linear flat roller bearing results in moving deviation 

due to profile deviation of raceway surface, uneven load 

or vibration. Therefore, the table or the bed must be 

equipped with a stopper at its end portion to prevent overrun 

of the flat roller bearing. (Fig. 5) 

Figs. 3 and 4 illustrate application examples of the 

linear flat roller bearing unit. 

S/2 

S 

Raceway surface requirements 

Table 1 shows the requirements for raceway surface 

applied to the linear flat roller bearings. 

Table 1 Raceway surface requirements 

Fig. 3 General application 


Tolerance 


0.2a 

Surface hardness 1 

HRC5864 

Effective hardened layer depth (min) 

0.4mm 

Mounting accuracy (max) 2 0.1 mm per 1000 mm 

1 Where raceway surface hardening not allowed, a quenched spring plate 

may be used. 

2 Mounting accuracy is expressed with an inclination value in Fig. 1. 

Fig. 4 When overhung load acts on 

Inclination 

Fig. 1 

B-248


NTN 

Stopper 

Fig. 5 

B-249


NTN 

Type FF 

Type FFZW 

 

 

DW 

23.5mm 

Boundary dimensions Basic load ratings Bearing Number Abutment Mass 

dynamic static dynamic static numbers of dimensions 

rolls 

mm N kgf 

mm 

kg 

Dw 1) b B L Lw a Cr Cor Cr Cor E H (approx.) 

2 10 32 6.8 2 8 500 19 700 865 2 010 FF2010 7 10.3 0.1 0 

0 1.70.2 

0.0020 

2 10 25 32 6.8 2 15 500 39 500 1 580 4 000 FF2025ZW 14 

0.1 0 

25.3 0 1.70.2 

0.0043 

2.5 15 45 9.8 2.4 17 100 41 400 1 740 4 200 FF2515 8 15.3 0.1 0 

0 2.2 

0.2 0.0038 

2.5 15 35 45 9.8 2.4 29 300 82 500 2 980 8 450 FF2535ZW 16 

0.1 0 

35.3 0 2.20.2 

0.0082 

3 20 60 13.8 3 31 000 79 500 3 150 8 100 FF3020 9 20.4 0.1 0 

0 2.7 

0.2 0.0089 

3 20 45 60 13.8 3 53 500 145 000 5 450 14 800 FF3045ZW 18 

0.1 0 

45.4 0 2.70.2 

0.019 

3.5 25 75 17.8 3.2 50 000 132 000 5 100 13 500 FF3525 10 25.4 0.1 3.2 0 

0 0.2 0.017 

3.5 25 55 75 17.8 3.2 86 000 265 000 8 800 27 000 FF3555ZW 20 

0.1 0 

55.4 0 3.20.2 

0.035 

Note 1) The dimensional tolerance for needle roller diameter Dw is 0 to -2 m. 

B-250


NTN 

Type BF 

Type RF 

 

 

DW 

37mm 

Boundary dimensions Basic load ratings 3) Bearing Abutment Mass 4) 


mm N kgf mm kg 

Dw 1) b L1 2) Lw l a Cr Cor Cr Cor E H (approx.) 

3 20 705 13.8 6 4.5 34 000 88 500 3 450 9 000 RF3020/705 

0.1 0 

20.4 0 2.70.2 

0.015 

3 20 1 000 15.8 6 5 38 000 102 000 3 850 10 400 BF3020/1000 

0.1 0 

20.4 0 2.70.2 

0.037 

5 23 1 000 19.8 8 8 87 000 211 000 8 850 21 500 BF5023/1000 

0.1 0 

23.4 0 4.70.2 

0.054 

5 32 1 000 27.8 8 8 114 000 299 000 11 600 30 500 BF5032/1000 

0.1 0 

32.4 0 4.70.2 

0.073 

7 28 1 000 24 11 10.5 155 000 355 000 15 800 36 000 BF7028/1000 

0.1 0 

28.5 0 6.70.2 

0.091 

7 35 1 000 30 11 10.5 185 000 445 000 18 900 45 500 BF7035/1000 

0.1 0 

35.5 0 6.70.2 

0.110 

Note 1) The dimensional tolerance for needle roller diameter Dw is 0 to -2 m. 

2) The standard length L1 of the cage shall be 1000 mm for Type BF and 705 mm for Type RF. 

Where special cage length is required, the nominal bearing number is followed by the numerical length value as exemplified below. 

Ex. Where L1 = 500 mm is required for BF3020, BF302/500 

3) The listed basic load ratings are subject to use of 10 flat rollers. Calculate the basic load ratings for any optional cage length L1 by the 

following formula. 

C = f1 7/9 Cr 

C0 = f1C0r 

Herein, f1=0.1 (L1l2a) / l 

4) The listed weights are subject to L1 = 100 mm. 

Remarks: For Type BF 

1. On occasion, the length of an ordered unit could be shorter by l dimension shown in each Dimensions Table because the roller and 

cage assy is cut at the minimum unit of each pocket so as to match the required length. 

2. Where this bearing unit is used frequently at various lengths, it is more economical to cut the standard bearing of 1000 mm length to 

each desired length at your side. 

B-251

Linear roller bearings 

NTN 

Linear Roller Bearings 

This roller bearing with cylindrical rollers having the 

function capable of circulating within the raceway block 

ensures smooth infinite linear motion on a flat surface. 

The cylindrical rollers are retained and guided by the 

cage and the ribs of the raceway block. 

The cage is of such a construction as not allow 

adjacent rollers to contact with one another. Hence, the 

friction coefficient is low. 

Requirements and tolerances for raceway 

surface and mounting surface 

Table 2 shows the requirements and tolerances for the 

raceway surface, on which linear roller bearing rolls, and 

the bearing mounting surface. Where adhesion of a hard 

foreign matter to the raceway surface is forecast, the 

raceway surface must be protected with a proper 

protective cover. 

The reference surface for mounting is the back face 

and opposite face to NTN mark. 

Table 2 Requirements for raceway surface and mounting surface 

Fig. 1 


Raceway surface roughness (max) 

Raceway surface hardness 

Effective hardened layer depth of 

raceway surface (min) 

Parallelism of mounting surface 

∆ x See Fig. 2 

∆ ySee Fig. 3 

Allowable value or tolerance range 

0.2a 

HRC5864 

as described in applicable 

Dimensions Table 

0.05 mm per 100 mm 

0.01 mm per 100 mm 


All the linear roller bearings are manufactured within 

the dimensional tolerance range of 0 to -2.5m for 

bearing height (H). And these bearings are delivered 

classified into 5-stepped tolerance classes. (See Table 1) 

NTN mark here 

Table 1 Classification of bearing height H by accuracy class 

Unit : m 

Class code Tolerance for height (H) 

Fig. 2 

1H 

2H 

3H 

4H 

5H 

0 5 

510 

1015 

1520 

2025 

Fig. 3 

How to mount 

Fix linear roller bearing using the tapped holes which 

are provided on the mounting reference surface. (See 

Fig. 4) 

Fig. 4 

B-252

Linear roller bearings 

NTN 

Type RLM 

Section ZZ 

H 

1638mm 

Boundary dimensions Bearing Basic load ratings Required Mass 

numbers dynamic static dynamic static case depth 

on track 

mm N kgf 

kg 

min. 

H C L Lw E F G Lt e g K Cr Cor Cr Cor mm (approx.) 

16 25 62 8 17 19 M4 35.5 12.5 6 3.2 RLM16 62 15 400 34 000 1 570 3 450 0.3 0.11 

19 27 69 10 25.5 20.6 M4 43.4 15.5 6 3.2 RLM19 69 26 100 58 000 2 670 5 900 0.3 0.16 

26 40 86 14 28 30 M6 52.4 21 10 4.5 RLM26 86 50 000 106 000 5 100 10 800 0.4 0.41 

26 40 102 14 44 30 M6 67.9 21 10 4.5 RLM26102 62 500 142 000 6 400 14 500 0.4 0.53 

26 40 126 14 68 30 M6 91.8 21 10 4.5 RLM26126 80 000 195 000 8 150 19 900 0.4 0.70 

38 52 134 20 51 41 M8 85.7 31 14 6.5 RLM38134 124 000 270 000 12 700 27 500 0.5 1.3 

B-253

B-254

One-way Clutches 

Tension Pulleys, 

Bottom Roller Bearings


NTN 

One-way Clutches 

This is a compact and roller type one-way clutch which 

formed a cam face on its outer ring. (Available shaft 

diameter range: 6 to 35 mm) When the outer ring is 

going to rotate counterclockwise against shaft rotation 

(arrow direction on outer ring widthay surface), the 

rollers advance to the position of engagement with the 

outer ring cam face by spring action and drive the shaft 

by acting as a wedge between the outer ring cam face 

and the shaft. (See Fig. 1) When the outer ring rotates 

clockwise against the shaft, the shaft rotates 

counterclockwise relatively to the outer ring and, as the 

result, the rollers get away from the outer ring cam face 

and simultaneously the outer ring idles against the shaft. 

(See Fig. 2) 

Fig. 1 

One-way clutch in engagement 

Fig. 2 

One-way clutch in idling 

Type 

Applied shaft 

diameter (mm) 


nominal clutch number 

Remarks 

Type HF 

635 

HF 10 12 

Width 

Bore diameter 

Type code 

One-way clutch HF composed of an outer ring drawn from 

a thin steel plate by precision drawing has the clutching 

function only. 

This one-way clutch must be provided with a bearing 

at its both sides to support radial load acting thereon 

and to ensure smooth rotating motion. 

Type HFL 

835 

HFL 10 22 

Width 

Bore diameter 

Type code 

One-way clutch HFL has an outer ring drawn from thin 

steel plate by precision drawing, a clutching function, and 

an integral needle roller and cage assembly capable of 

supporting radial load at its both ends respectively. 

Thus, this HFL can function as clutch and, in addition, 

support radial load. 

Both of Type HF and HFL use a polyamide resin cage 

and press the needle rollers to a wedge, which is formed 

between the outer ring cam face and the shaft, by action 

of a plate spring supported with the cage. 

Clutch fit 

Table 1 shows the one-way clutch fits on shaft and in 

housing. Both of Type HF and HFL are only press-fitted in 

a housing, needing no axial fixing by use of a snap ring, 

etc. 

However, due to the outer ring drawn from thin steel by 

precision drawing, the performance of the both is directly 

affected by the dimensional and profile deviations of the 

shaft/housing. To avoid such an inverse affect, shaft and 

housing accuracy must be controlled with good care. Any 

housing is required to have the wall thickness of a 

specified value or more. Table 2 shows the 

recommended value. 

Table 1 Clutch fits 

Type 

HF 

HFL 

Shaft 

Housing 

Iron series Light metal alloy 

h5 (h6) N6 (N7) R6 (R7) 

Table 2 Recommended housing wall thickness 

Housing material 

Steel, cast iron 

Light metal alloy 

Housing wall thickness 

0.75DFwand over 

1.5DFwand over 

B-256


NTN 


Table 3 shows the shaft and housing requirements. 

A 

Table 3 Shaft and housing requirements (recommended) 






Effective hardened 

layer depth (min) 

Shaft 

Housing 

Type HF Type HFL Type HF Type HFL 

IT3 (IT4) 

IT3 (IT4) 

0.2a 

HRC5864 

0.4mm 

IT4 (IT5) 

IT4 (IT5) 

1.6a 

 

 

B 

˚ 

AD0.20.3mm 

BFw00.025mm 

DOuter diameter of one-way clutch mm 

FwRoller inscribed circle diameter mm 

(Refer to applicable Dimensions Table.) 

Fig. 3 

Lubrication 

Oil lubrication is optimum for these one-way clutches, 

but generally grease lubrication is mostly applied to this 

type of one-way clutch. NTN one-way clutches are filled 

up with a suitable grease. These clutches need no further 

grease replenishment, but subject to general applications. 

In replenishing, good care must be exercised of too 

much grease filling. Too much filling could cause 

interference with smooth clutching. 

Allowable operating temperature 

For Type HF and HFLOil lubrication : -10 to 120˚C 

Grease lubrication : -10 to 70˚C 

However, consult with NTN for application under 

temperature exceeding the said temperature range. 

How to mount 

It is convenient to use a press-fitting mandrel as 

illustrated in Fig. 3 for assembling and mounting these 

one-way clutches. In that case, press-fit the outer ring, 

with its stamped mark side kept in contact with the 

mandrel shoulder. 

In assembling, be careful to prevent the outer ring 

from twisting. Avoid to hammer directly the outer ring 

and, in press-fitting, bring a proper jig in contact with 

the outer ring side face without fail. Furthermore, 

when press-fitting in an housing with shoulder, good 

care must be exercised to prevent the bearing side 

face from coming into contact with the housing 

shoulder and to thereby avoid deformation of the 

bearing. 

Also, shaft can be easily assembled by turning it in 

clutch idling direction. Where impossible to do so, provide 

the shaft end with a tapered (chamfered) guide to 

facilitate assembling-in. 

Precautions in selecting 

NTN makes it a rule to conduct functional verification 

tests on its manufactured one-way clutches under various 

test conditions. However, be noted that the clutch lifetime 

could reduce depending on the following factors; 

application to high load torque, high oscillation cycle and 

fine oscillation, etc., large radial load acting on one-way 

clutch unit, and use of a shaft with lower hardness. 

Furthermore, lock failure could occur in the cases of 

fast idling speed, frequent use in idling, and application 

incurring vibration. 

When using these one-way clutches under the special 

conditions stated above, feel free to contact NTN for 

further instructions. 

When it is forecast that clutching function 

failure of one-way clutch(ex. clutch slip in 

engaging) could result in serious damage to 

person or equipment, appropriate safety devices 

must be provided separately. 

B-257

One-way clutch miniature type 

NTN 

Type HF 

Type HF 

FW 

635mm 

Boundary dimensions Torque capacity Bearing Mass Part number by radial load 

Md 

numbers 

mm Nm kgfm kg (approx.) 

Fw D C 

needle roller oil retaining 

(approx.) bearing bearing 

0 

0.25 

6 10 12 1.76 0.18 HF0612 0.003 HK0609T2 B-S6-22 

8 12 12 3.15 0.32 HF0812 0.0035 HK0810 B-S8-25 

10 14 12 5.30 0.54 HF1012 0.004 HK1010 B-S10-21 

12 18 16 12.2 1.24 HF1216 0.0116 HK1212 B-S12-32 

14 20 16 17.3 1.76 HF1416 0.013 HK1412 B-S14-13 

16 22 16 20.5 2.09 HF1616 0.014 HK1612 B-S16-13 

18 24 16 24.1 2.46 HF1816 0.0155 HK1812 B-S18-8 

20 26 16 28.5 2.91 HF2016 0.017 HK2012 B-S20-19 

25 32 20 66 6.73 HF2520 0.0309 HK2512 B-S25-11 

30 37 20 90 9.18 HF3020 0.036 HK3012 B-S30-19 

35 42 20 121 12.3 HF3520 0.040 HK3512 B-S35-7 

Remarks: Type HF is subject to delivery of INA product instead. 

Type HFL is the imported product from INA, Germany. 

B-258

One-way clutch miniature type 

NTN 

Type HFL 

C 

D 

FW 

Type HFL 

d 

835mm 

Shaft dia Boundary dimensions Basic load ratings Bearing Torque capacity Mass 


mm mm N kgf Nmm kgfm kg 

d Fw D C 

0 

0.25 


8 8 12 22 4 050 413 4 150 423 HFL0822 3.15 0.32 0.0063 

10 10 14 22 4 300 438 4 650 474 HFL1022 5.30 0.54 0.0074 

12 12 18 26 6 300 642 6 500 663 HFL1226 12.2 1.24 0.018 

14 14 20 26 7 100 724 7 700 785 HFL1426 17.3 1.76 0.020 

16 16 22 26 7 300 744 8 400 857 HFL1626 20.5 2.09 0.022 

18 18 24 26 8 300 846 10 300 1 050 HFL1826 24.1 2.46 0.024 

20 20 26 26 8 200 836 10 400 1 060 HFL2026 28.5 2.91 0.027 

25 25 32 30 10 900 1 110 14 100 1 440 HFL2530 66.0 6.73 0.044 

30 30 37 30 12 600 1 280 17 600 1 790 HFL3030 90.0 9.18 0.051 

35 35 42 30 13 000 1 330 19 300 1 970 HFL3530 121 12.3 0.058 

B-259


NTN 

Bottom Roller Bearings for Textile Machinery 

These bottom roller bearings for textile machinery are 

grease-prefilled needle roller bearings intended to support 

the bottom rollers (fluted rollers) of a fine spinning 

machine, a roving frame or a drawing frame. Type FRIS 

is applied to a fine spinning machine and a roving frame, 

and Type FR applied to a drawing frame. 

Types and construction 

Bottom roller bearing FRIS is used to support the 

bottom rollers of a fine spinning machine and a roving 

frame. The outer ring outer profile of this bearing type is 

spherical, which can allow, to some extent, mounting 

error in the bottom rollers. On the other hand, the inner 

ring is provided with a rib at its both ends and a clearance 

between the outer ring and each inner ring rib is 

minimized. Furthermore, the rib outer surface is knurled 

to prevent invasion of cotton pieces into the bearing. 

These bottom roller bearings are classified into 

internationally interchangeable A-series bearings with 

bearing fixing saddle (to fix a bearing to a support stand) 

and B-series bearings adaptable to the dimensions of JIS 

Fluted Rollers. 

A-series bearings are further classified into one 

bearing type (bearing number + tail code SA) wherein 

inner ring and outer ring are separable from one another 

according to saddle type and another bearing type 

(bearing number + tail code SB) wherein inner ring and 

outer ring are non-separable. Of course, these bearings 

can also be supplied without saddle. 

W) (latter two types---classified by the fixing method 

applied). 

These bearings can be supplied with saddle thereon on 

request, similarly to A-series. 

Type FR is used to support the rollers of a drawing 

frame. This bearing type is composed of two drawn cup 

type needle roller bearings which are configured in a 

housing. These have no inner ring and use a shaft as the 

direct raceway surface. Synthetic rubber seal is fitted in 

the both ends of the housing. This bearing type is fixed to 

a support stand with knock pins press-fitted in the 

housing. The knock pin is provided with an grease hole 

to enable grease replenishing. 

Fig. 4 Type FR 

Nominal bearing number 

Nominal bearing number comprises type code, 

dimension code [shaft dia. (d or Fw)] and tail code. 

FRIS 19 SB 

Tail code 


Type code 

Fig. 1 Type FRISSA 

Fig. 2 Type FRISSB 

Fig.5 

On the other hand, B-series bearings are further 

classified into bearing type with grease nipple (bearing 

number + tail code N) , bearing type with knock pin on its 

outer ring (bearing number + tail code P) and bearing 

type with knock hole on its outer ring (bearing number + 

Bearing fits 

Table 1 shows bearing fits on/in shaft and housing. 

Table 1 Bearing fits 

Bearing type 

FRIS 

FR 

Shaft 

Screwed joint Spline joint 

g5 (g6) j5 (j6) 

h5 (h6) 

Housing (stand) 

H10 

H10 

Fig.3 Type FRIS 

B-260

Bottom roller bearings 

NTN 

Type FRIS Series A 

(For fine spinning machine/ 

roving frame) 

Type FRIS 

Type FRISSA 

(Separable) 

Type FRISSB 

(Non-separable) 

d 

16.525mm 




mm N kgf 

d D B C E rs min 1) L K 

0 

0 

0 

0.010 

0.050 0.120 

Cr Cor Cr Cor 

0 

16.5 28 –0.020 19 22 23.5 0.3 22.2 7.7 10 200 14 600 1 040 1 480 

19 

32 0 20 23 27 0.3 22.2 7.7 11 800 18 500 1 200 1 880 

36 

–0.025 

22 25 29 0.3 22.2 9.8 12 700 17 600 1 300 1 800 

22 42 

0 

–0.025 25 29 35 0.3 26.4 10.2 19 500 25 300 1 980 2 580 

25 45 

0 

–0.025 25 29 37 0.3 26.4 10.2 21 300 29 100 2 170 2 970 


B-261


NTN 

Bearing numbers Abutment dimensions Mass 

bearing bearing with saddle mm kg 

bearing with saddle 

Type SA Type SB L1 d1 G H (approx.) 

FRIS16.5 FRIS16.5SA FRIS16.5SB 22 21 13 2426 0.059 

FRIS19 FRIS19SA FRIS19SB 22 24 15 2729 0.081 

FRIS19-5 FRIS19-5SA FRIS19-5SB 22 26 15 3032 0.120 

FRIS22-2 FRIS22-2SA 26 30 15 3537 0.208 

FRIS25 FRIS25SA 26 33 15 3739 0.226 

B-262


NTN 

Type FRIS Series B 

(For fine spinning machine/ 

roving frame) 

Type FRIS 

Type FRISNP 

(With grease nipple/knock pin) 2 

d 

1525mm 


dynamic static dynamic static (approx.) 

mm N kgf kg 

d D B C J rs min 1) K Type 

0 

0.010 

Cr Cor Cr Cor Type FRIS Type FRISNP FRISNP 

15 28 

0 

0.020 24 22 22 0.3 7.7 10 200 14 600 1 040 1 480 FRIS15 FRIS15NP 0.070 

15.875 30 

0 

0.020 25.4 22 22 0.3 7.1 10 200 14 600 1 040 1 480 FRIS15.87 FRIS15.87NP 0.082 

16 

0 

0.050 

0 

0.120 

28 0 26 22 22 0.3 7.7 10 200 14 600 1 040 1 480 FRIS16 FRIS16NP 0.083 

30 

0.020 

26 22 22 0.3 7.1 10 200 14 600 1 040 1 480 FRIS16-2 FRIS16-2NP 0.098 

18 

19.050 

31.750 0 24 23 24 0.3 7.7 11 800 18 500 1 200 1 880 FRIS18 FRIS18NP 0.083 

32 

0.025 

26 23 24 0.3 7.7 11 800 18 500 1 200 1 880 FRIS18-2 FRIS18-2NP 0.088 

31.750 0 23.81 23 24 0.3 7.7 11 800 18 500 1 200 1 880 FRIS19.05 FRIS19.05NP 0.078 

34 

0.025 

25.4 23 26 0.3 7.7 12 700 17 600 1 300 1 800 FRIS19.05-1 FRIS19.05-1NP 0.098 

34 24 23 26 0.3 7.7 12 700 17 600 1 300 1 800 FRIS20-2 FRIS20-2NP 0.089 

20 34 

0 

0.025 26 23 26 0.3 7.7 12 700 17 600 1 300 1 800 FRIS20-4 FRIS20-4NP 0.097 

36 26 23 26 0.3 7.1 12 700 17 600 1 300 1 800 FRIS20-7 FRIS20-7NP 0.125 

22 40 

0 

0.025 26 24 30 0.6 7.1 16 200 22 300 1 650 2 280 FRIS22-1 FRIS22-1NP 0.154 

22.225 40 

0 

0.025 25.4 24 30 0.6 7.1 16 200 22 300 1 650 2 280 FRIS22.22 FRIS22.22NP 0.145 

25 

42 0 26 24 32 0.6 7.1 16 000 22 500 1 640 2 290 FRIS25-1 FRIS25-1NP 0.154 

44 

0.025 

26 24 34 0.6 7.1 17 200 25 100 1 750 2 560 FRIS25-2 FRIS25-2NP 0.174 


2) Example of bearing with grease nipple: Ex. FRIS 18N 

Bearing with knock pin only: Ex. FRIS 15.87P 

B-263


NTN 

Type FR 

(Drawing frame) 

Type FR 

FW 

17.46222mm 

17.462 

Boundary dimensions Basic load ratings Bearing Mass 


mm N kgf kg 

Fw D C E G H K D1 

0 

0 

0.050 0.20 


+0.053 

+0.010 

26.5 46 24 31 5 5 26 10 200 16 600 1 040 1 690 FR17.46P 0.066 

26.5 47.6 24.6 42.86 4.76 4.76 26 14 400 25 900 1 470 2 640 FR17.46-1P 0.075 

26.5 52.38 24.6 42.86 4.76 4.76 26 14 400 25 900 1 470 2 640 FR17.46-2P 0.082 

26.988 41.28 24 31 5 5 26.5 10 200 16 600 1 040 1 690 FR17.46-3P 0.068 

+0.053 

19.050 +0.020 31.750 52.38 28 42.86 4.76 4.76 31.2 16 700 25 800 1 700 2 630 FR19.05P 0.134 

+0.053 

22 +0.020 34 46 28 43 4.76 4.76 33.5 23 400 44 000 2 380 4 500 FR22P 0.150 

B-264

Tensioner pulleys for textile machinery 

NTN 

Tensioner Pulleys for Textile Machinery 

These pulleys are used to guide and tension the tapes 

and belts driving the spindles of a fine spinning machine, 

a roving frame, a false twister, etc. 

A pulley drawn precisely from steel plate by precision 

deep drawing is press-fitted in the outer ring of shaft 

bearing in in place of inner ring. 


Nominal number comprises type code (JPUS) , 

dimension code (Pulley outer dia. (D) and tail code. 

Tension pulley with special-purposed holder is 

represented by nominal number + tail code (holder 

nominal number). 

Types and construction 

Single-row or double-row ball bearing is built in this 

pulley, which is internally prefilled with lithium soap base 

grease. Grease is replenished through a grease hole 

which is internally provided in the stud. Two different 

mounting methods are available as follows for these 

pulleys; one method is to bolt a pulley to the roller carrier 

of machine with holder bolt using a special-purposed 

holder (Type code: JFS) and another method is to bolt 

directly a pulley to machine frame using the bolting hole 

drilled in the stud and a corresponding hexagon head 

bolt. A knock pin press-fitted in the stud end face is to 

lock the bolt after tightened. 

When a pulley is directly bolted to machine frame, 

provide the hexagon head bolt center with a grease 

through-hole for grease replenishing and screw a grease 

nipple in its end face. 

In mounting a double-row ball bearing type tension 

pulley, insert the stud directly into machine frame and 

tighten it with nut, without using the special-purposed 

holder. Replenish grease using the box nut. 

JPU 90 SJF4S 

Fig. 4 

Holder nominal number 

Tail code 


Type code 

Fig. 1 

Single-row bearing type 

ension pulley 

Fig. 2 

Tension pulley 

with holder 

Box nut 

Fig. 3 

Double-row bearing type 

tension pulley 

B-265

Tensioner pulleys 

NTN 

Section x-x 

Example 1 Example 2 

Example 3 

D 

60100mm 

Boundary dimensions Bearing Sample Mass 

numbers number 

mm 

kg 

D B B1 H d1 a b S L B2 

0 

0.3 

(approx.) 

60 25 3.5 JPU60S 1 0.140 

25 3.5 JPU70S 1 0.160 

25 3.5 48 39 10.2 JPU70SJF1S 2 0.235 

70 30 2 21 67 71 59 JPU70-2S 3 0.245 

32 JPU70-1S 1 0.175 

32 48 46 10.2 JPU70-1SJF2S 2 0.250 

90 

100 

25 3.5 JPU90S 1 0.215 

25 3.5 58 39 10.2 JPU90SJF3S 2 0.300 

32 JPU90-1S 1 0.230 

32 58 46 10.2 JPU90-1SJF4S 2 0.320 

32 3.5 21 70.574.5 59 JPU90-9S 3 0.325 

45 3.5 21 83.587.5 59 JPU90-10S 3 0.380 

32 3.5 21 70.574.5 59 JPU100-14S 3 0.290 

40 3.5 21 78.582.5 59 JPU100-12S 3 0.390 

B-266

Contents of Appendix 

Approximate conversion values against Rockwell C hardness of steel materials ⋯C-2 

˚C-˚F temperature conversion table⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-3 

Approximate conversion values against Vickers hardness of steel materials ⋯C-4 

Contrast table of SI and CGS system units, gravitation system units ⋯⋯⋯⋯⋯C-6 

Conversion to SI units ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-6 

Integer multiplication of SI unit 10 ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-7 

kgf-N conversion table⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-8 

Viscosity conversion table ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-9 

Ordinary tolerance for cutting dimensions ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-10 

Ordinary tolerances for castings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-10 

Ordinary tolerances for press-formed metal parts ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-10 

Ordinary tolerance for die casts ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-11 

Ordinary tolerances for sheared metal plates ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-12 

Ordinary tolerance for sintered metal parts ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-13 

Ordinary tolerance for steel castings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-14 

Ordinary tolerance for aluminum alloy castings ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-14 

Ordinary tolerance for length ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-15 

Ordinary tolerance for wall thickness ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-15 

Maximum draft angle value ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-15 

Tolerance for shaft diameter ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-16 

Dimensional tolerance for housing bore⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-18 

Inch - Millimeter conversion table ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯C-20 

C-1

C-2 

Appendix 

NTN 

Approximate conversion values against Rockwell C hardness of steel materials 1 

940 

900 

865 

832 

800 

772 

746 

720 

697 

674 

653 

633 

613 

595 

577 

560 

544 

528 

513 

498 

484 

471 

458 

446 

434 

423 

412 

402 

392 

382 

372 

363 

354 

345 

336 

327 

318 

310 

302 

294 

286 

279 

272 

266 

260 

254 

248 

243 

238 

230 

222 

213 

204 

196 

188 

180 

173 

166 

160 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

500 

487 

475 

464 

451 

442 

432 

421 

409 

400 

390 

381 

371 

362 

353 

344 

336 

327 

319 

311 

301 

294 

286 

279 

271 

264 

258 

253 

247 

243 

237 

231 

226 

219 

212 

203 

194 

187 

179 

171 

165 

158 

152 

 

 

 

 

 

 

 

 

613 

599 

587 

575 

561 

546 

534 

519 

508 

494 

481 

469 

455 

443 

432 

421 

409 

400 

390 

381 

371 

362 

353 

344 

336 

327 

319 

311 

301 

294 

286 

279 

271 

264 

258 

253 

247 

243 

237 

231 

226 

219 

212 

203 

194 

187 

179 

171 

165 

158 

152 

 

 

 

739 

722 

705 

688 

670 

654 

634 

615 

595 

577 

560 

543 

525 

512 

496 

481 

469 

455 

443 

432 

421 

409 

400 

390 

381 

371 

362 

353 

344 

336 

327 

319 

311 

301 

294 

286 

279 

271 

264 

258 

253 

247 

243 

237 

231 

226 

219 

212 

203 

194 

187 

179 

171 

165 

158 

152 

85.6 

85.0 

84.5 

83.9 

83.4 

82.8 

82.3 

81.8 

81.2 

80.7 

80.1 

79.6 

79.0 

78.5 

78.0 

77.4 

76.8 

76.3 

75.9 

75.2 

74.7 

74.1 

73.6 

73.1 

72.5 

72.0 

71.5 

70.9 

70.4 

69.9 

69.4 

68.9 

68.4 

67.9 

67.4 

66.8 

66.3 

65.8 

65.3 

64.7 

64.3 

63.8 

63.3 

62.8 

62.4 

62.0 

61.5 

61.0 

60.5 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

109.0 

108.5 

108.0 

107.5 

107.0 

106.0 

105.5 

104.5 

104.0 

103.0 

102.5 

101.5 

101.0 

100.0 

99.0 

98.5 

97.8 

96.7 

95.5 

93.9 

92.3 

90.7 

89.5 

87.1 

85.5 

83.5 

81.7 

76.9 

76.1 

75.4 

74.5 

73.8 

73.0 

72.2 

71.5 

70.7 

69.9 

69.2 

68.5 

67.7 

66.9 

66.1 

65.4 

64.6 

63.8 

63.1 

62.1 

61.4 

60.8 

60.0 

59.2 

58.5 

57.7 

56.9 

56.2 

55.4 

54.6 

53.8 

53.1 

52.3 

51.5 

50.8 

50.0 

49.2 

48.4 

47.7 

47.0 

46.1 

45.2 

44.6 

43.8 

43.1 

42.1 

41.6 

40.9 

40.1 

 

 

 

 

 

 

 

 

 

 

93.2 

92.9 

92.5 

92.2 

91.8 

91.4 

91.1 

90.7 

90.2 

89.8 

89.3 

88.9 

88.3 

87.9 

87.4 

86.9 

86.4 

85.9 

85.5 

85.0 

84.5 

83.9 

83.5 

83.0 

82.5 

82.0 

81.5 

80.9 

80.4 

79.9 

79.4 

78.8 

78.3 

77.7 

77.2 

76.6 

76.1 

75.6 

75.0 

74.5 

73.9 

73.3 

72.8 

72.2 

71.6 

71.0 

70.5 

69.9 

69.4 

 

 

 

 

 

 

 

 

 

 

84.4 

83.6 

82.8 

81.9 

81.1 

80.1 

79.3 

78.4 

77.5 

76.6 

75.7 

74.8 

73.9 

73.0 

72.0 

71.2 

70.2 

69.4 

68.5 

67.6 

66.7 

65.8 

64.8 

64.0 

63.1 

62.2 

61.3 

60.4 

59.5 

58.6 

57.7 

56.8 

55.9 

55.0 

54.2 

53.3 

52.1 

51.3 

50.4 

49.5 

48.6 

47.7 

46.8 

45.9 

45.0 

44.0 

43.2 

42.3 

41.5 

 

 

 

 

 

 

 

 

 

 

75.4 

74.2 

73.3 

72.0 

71.0 

69.9 

68.8 

67.7 

66.6 

65.5 

64.3 

63.2 

62.0 

60.9 

59.8 

58.6 

57.4 

56.1 

55.0 

53.8 

52.5 

51.4 

50.3 

49.0 

47.8 

46.7 

45.5 

44.3 

43.1 

41.9 

40.8 

39.6 

38.4 

37.2 

36.1 

34.9 

33.7 

32.5 

31.3 

30.1 

28.9 

27.8 

26.7 

25.5 

24.3 

23.1 

22.0 

20.7 

19.6 

 

 

 

 

 

 

 

 

 

 

97 

95 

92 

91 

88 

87 

85 

83 

81 

80 

78 

76 

75 

74 

72 

71 

69 

68 

67 

66 

64 

63 

62 

60 

58 

57 

56 

55 

54 

52 

51 

50 

49 

48 

47 

46 

44 

43 

42 

41 

41 

40 

38 

38 

37 

36 

35 

35 

34 

33 

32 

31 

29 

28 

27 

26 

25 

24 

24 

68 

67 

66 

65 

64 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

30 

29 

28 

27 

26 

25 

24 

23 

22 

21 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

0 

 

 

 

 

 

 

 

 

 

 

 

 

 

212 

205 

199 

192 

186 

179 

172 

167 

161 

156 

151 

146 

141 

136 

132 

127 

124 

120 

118 

114 

110 

108 

105 

102 

100 

97 

95 

93 

90 

88 

86 

84 

82 

80 

79 

77 

75 

72 

69 

66 

63 

61 

59 

56 

54 

53 

Standard 

ball 

Hultgren 

ball 

Tungsten 

carbite ball 

Brinnel hardness 

100 mm ball, load 3000 kgf 

Rockwell special hardness 

special brake indenter 

Rockwell hardness 2 

A scale 

Load 

60kgf 

brale 

identer 

B scale 

Load 

100 kgf dia. 

1/16in. 

ball 

D-scale 

Load 

100 kgf 

brale 

indenter 

15-N scale 

Load 

15 kgfkgf 

30-N scale 

Load 

30 kgf 

45-N scale 

load 

45 kgf 

Tensile 

strength 

kgf/mm 2 

Approx. 

value 

Rockwell 

C scale 

hardness 

68 

67 

66 

65 

64 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

48 

47 

46 

45 

44 

43 

42 

41 

40 

39 

38 

37 

36 

35 

34 

33 

32 

31 

30 

29 

28 

27 

26 

25 

24 

23 

22 

21 

20 

18 

16 

14 

12 

10 

8 

6 

4 

2 

0 

Rockwell 

C scale 

hardness 

Pickers 

hardness 

Shore 

hardness 

DPH 

Note 1) Approximate values were determined from “Conversion Tables” of JIS Z 8413 and Z 8438. 

2) Some of the parenthesized values in the above table are not used so frequently. 

2) 2)

Appendix 

NTN 

˚C-˚F temperature conversion table 

˚C 

F 

˚C 

F 

˚C 

F 

˚C 

F 

73 

62 

51 

100 

80 

60 

148 

112 

76 

1.6 

1.1 

0.6 

29 

30 

31 

84.2 

86.0 

87.8 

17.7 

18.2 

18.8 

64 

65 

66 

147.2 

149.0 

150.8 

37.1 

37.7 

40.6 

99 

100 

105 

210.2 

212 

221 

40 

29 

23.3 

40 

20 

10 

40 

4 

14 

0 

0.5 

1.1 

32 

33 

34 

89.6 

91.4 

93.2 

19.3 

19.9 

20.4 

67 

68 

69 

152.6 

154.4 

156.2 

43 

49 

54 

110 

120 

130 

230 

248 

266 

17.7 

17.2 

16.6 

0 

1 

2 

32 

33.8 

35.6 

1.6 

2.2 

2.7 

35 

36 

37 

95.0 

96.8 

98.6 

21.0 

21.5 

22.2 

70 

71 

72 

158.0 

159.8 

161.6 

60 

65 

71 

140 

150 

160 

284 

302 

320 

16.1 

15.5 

15.0 

3 

4 

5 

37.4 

39.2 

41.0 

3.3 

3.8 

4.4 

38 

39 

40 

100.4 

102.2 

104.0 

22.7 

23.3 

23.8 

73 

74 

75 

163.4 

165.2 

167.0 

76 

83 

88 

170 

180 

190 

338 

356 

374 

14.4 

13.9 

13.3 

6 

7 

8 

42.8 

44.6 

46.4 

4.9 

5.4 

6.0 

41 

42 

43 

105.8 

107.6 

109.4 

24.4 

25.0 

25.5 

76 

77 

78 

168.8 

170.6 

172.4 

93 

121 

149 

200 

250 

300 

392 

482 

572 

12.7 

12.2 

11.6 

9 

10 

11 

48.2 

50.0 

51.8 

6.6 

7.1 

7.7 

44 

45 

46 

111.2 

113.0 

114.8 

26.2 

26.8 

27.3 

79 

80 

81 

174.2 

176.0 

177.8 

177 

204 

232 

350 

400 

450 

662 

752 

842 

11.1 

10.5 

10.0 

12 

13 

14 

53.6 

55.4 

57.2 

8.2 

8.8 

9.3 

47 

48 

49 

116.6 

118.4 

120.2 

27.7 

28.2 

28.8 

82 

83 

84 

179.6 

181.4 

183.2 

260 

288 

315 

500 

550 

600 

932 

1 022 

1 112 

9.4 

8.8 

8.3 

15 

16 

17 

59.0 

61.8 

63.6 

9.9 

10.4 

11.1 

50 

51 

52 

122.0 

123.8 

125.6 

29.3 

29.9 

30.4 

85 

86 

87 

185.0 

186.8 

188.6 

343 

371 

399 

650 

700 

750 

1 202 

1 292 

1 382 

7.7 

7.2 

6.6 

18 

19 

20 

65.4 

67.2 

68.0 

11.5 

12.1 

12.6 

53 

54 

55 

127.4 

129.2 

131.0 

31.0 

31.5 

32.1 

88 

89 

90 

190.4 

192.2 

194.0 

426 

454 

482 

800 

850 

900 

1 472 

1 562 

1 652 

6.1 

5.5 

5.0 

21 

22 

23 

69.8 

71.6 

73.4 

13.2 

13.7 

14.3 

56 

57 

58 

132.8 

134.6 

136.4 

32.6 

33.3 

33.8 

91 

92 

93 

195.8 

197.6 

199.4 

510 

538 

593 

950 

1 000 

1 100 

1 742 

1 832 

2 012 

4.4 

3.9 

3.3 

24 

25 

26 

75.2 

77.0 

78.8 

14.8 

15.6 

16.1 

59 

60 

61 

138.2 

140.0 

141.8 

34.4 

34.9 

35.5 

94 

95 

96 

201.2 

203.0 

204.8 

648 

704 

760 

1 200 

1 300 

1 400 

2 192 

2 372 

2 552 

2.8 

2.2 

27 

28 

80.6 

82.4 

16.6 

17.1 

62 

63 

143.6 

145.4 

36.1 

36.6 

97 

98 

206.6 

208.4 

815 

871 

1 500 

1 600 

2 732 

2 937 

(How to read this table) 

For example, for conversion from 38˚C to ˚F read 38 in 4th row box (10th line from the top) and then read the right-side ˚F box. 

38˚C is equivalent to 100.4˚F upon reading. Furthermore, for conversion from 38˚F to ˚C read the left-side ˚C box. 

˚F38 is equivalent to 3.3˚C upon reading. 

C5/9F32 

F9/5C+32 

C-3

C-4 

Appendix 

NTN 

Approximate conversion values against Vickers hardness of steel materials 

940 

920 

900 

880 

860 

840 

820 

800 

780 

760 

740 

720 

700 

690 

680 

670 

660 

650 

640 

630 

620 

610 

600 

590 

580 

570 

560 

550 

540 

530 

520 

510 

500 

490 

480 

470 

460 

450 

440 

430 

420 

410 

400 

390 

380 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

505 

496 

488 

480 

473 

465 

456 

448 

441 

433 

425 

415 

405 

397 

388 

379 

369 

360 

 

 

 

 

 

 

 

 

 

 

 

 

615 

610 

603 

597 

590 

585 

578 

571 

564 

557 

550 

542 

535 

527 

519 

512 

503 

495 

487 

479 

471 

460 

452 

442 

433 

425 

415 

405 

397 

388 

379 

369 

360 

 

 

 

767 

757 

745 

733 

722 

710 

698 

684 

670 

656 

647 

638 

630 

620 

611 

601 

591 

582 

573 

564 

554 

545 

535 

525 

517 

507 

497 

488 

479 

471 

460 

452 

442 

433 

425 

415 

405 

397 

388 

379 

369 

360 

85.6 

85.3 

85.0 

84.7 

84.4 

84.1 

83.8 

83.4 

83.0 

82.6 

82.2 

81.8 

81.3 

81.1 

80.8 

80.5 

80.3 

80.0 

79.8 

79.5 

79.2 

78.9 

78.6 

78.4 

78.0 

77.8 

77.4 

77.0 

76.7 

76.4 

76.1 

75.7 

75.3 

74.9 

74.5 

74.1 

73.6 

73.3 

72.8 

72.3 

71.8 

71.4 

70.8 

70.3 

69.8 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

110.0 

68.0 

67.5 

67.0 

66.4 

65.9 

65.3 

64.7 

64.0 

63.3 

62.5 

61.8 

61.0 

60.1 

59.7 

59.2 

58.8 

58.3 

57.8 

57.3 

56.8 

56.3 

55.7 

55.2 

54.7 

54.1 

53.6 

53.0 

52.3 

51.7 

51.1 

50.5 

49.8 

49.1 

48.4 

47.7 

46.9 

46.1 

45.3 

44.5 

43.6 

42.7 

41.8 

40.8 

39.8 

38.8 

76.9 

76.5 

76.1 

75.7 

75.3 

74.8 

74.3 

73.8 

73.3 

72.6 

72.1 

71.5 

70.8 

70.5 

70.1 

69.8 

69.4 

69.0 

68.7 

68.3 

67.9 

67.5 

67.0 

66.7 

66.2 

65.8 

65.4 

64.8 

64.4 

63.9 

63.5 

62.9 

62.2 

61.6 

61.3 

60.7 

60.1 

59.4 

58.8 

58.2 

57.5 

56.8 

56.0 

55.2 

54.4 

93.2 

93.0 

92.9 

92.7 

92.5 

92.3 

92.1 

91.8 

91.5 

91.2 

91.0 

90.7 

90.3 

90.1 

89.8 

89.7 

89.5 

89.2 

89.0 

88.8 

88.5 

88.2 

88.0 

87.8 

87.5 

87.2 

86.9 

86.6 

86.3 

86.0 

85.7 

85.4 

85.0 

84.7 

84.3 

83.9 

83.6 

83.2 

82.8 

82.3 

81.8 

81.4 

81.0 

80.3 

79.8 

84.4 

84.0 

83.6 

83.1 

82.7 

82.2 

81.7 

81.1 

80.4 

79.7 

79.1 

78.4 

77.6 

77.2 

76.8 

76.4 

75.9 

75.5 

75.1 

74.6 

74.2 

73.6 

73.2 

72.7 

72.1 

71.7 

71.2 

70.5 

70.0 

69.5 

69.0 

68.3 

67.7 

67.1 

66.4 

65.7 

64.9 

64.3 

63.5 

62.7 

61.9 

61.1 

60.2 

59.3 

58.4 

75.4 

74.8 

74.2 

73.6 

73.1 

72.2 

71.8 

71.0 

70.2 

69.4 

68.6 

67.7 

66.7 

66.2 

65.7 

65.3 

64.7 

64.1 

63.5 

63.0 

62.4 

61.7 

61.2 

60.5 

59.9 

59.3 

58.6 

57.8 

57.0 

56.2 

55.6 

54.7 

53.9 

53.1 

52.2 

51.3 

50.4 

49.4 

48.4 

47.4 

46.4 

45.3 

44.1 

42.9 

41.7 

97 

96 

95 

93 

92 

91 

90 

88 

87 

86 

84 

83 

81 

 

80 

 

79 

 

77 

 

75 

 

74 

 

72 

 

71 

 

69 

 

67 

 

66 

 

64 

 

62 

 

59 

 

57 

 

55 

 

52 

940 

920 

900 

880 

860 

840 

820 

800 

780 

760 

740 

720 

700 

690 

680 

670 

660 

650 

640 

630 

620 

610 

600 

590 

580 

570 

560 

550 

540 

530 

520 

510 

500 

490 

480 

470 

460 

450 

440 

430 

420 

410 

400 

390 

380 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

210 

206 

202 

199 

195 

190 

186 

183 

179 

174 

169 

165 

160 

156 

153 

149 

144 

140 

136 

131 

127 

123 

Standard 

ball 

Hultgren 

ball 






Tungsten 

carbite ball 

A scale 

Load 

60 kgf 

brale 

identer 

B scale 

Load 

100 kgf dia. 

1/16in. 

ball 

C-scale 

Load 

150 kgf 

brale 

indenter 

D-scale 

Load 

100 kgf 

brale 

indenter 

15-N scale 

Load 

15 kgf 

30-N scale 

Load 

30 kgf 

45-N scale 

load 

45 kgf 

Tensile 

strength 

kgf/mm 2 

Approx. 

value 

Vickers 

hardness 

Load 

50kgf 

Shore 

hardness 

DPH 

Vickers 

hardness

C-5 

Appendix 

NTN 

Standard 

ball 

Hultgren 

ball 






Tungsten 

carbite ball 

A scale 

Load 

60 kgf 

brale 

identer 

B scale 

Load 

100 kgf dia. 

1/16in. 

ball 

C-scale 

Load 

150 kgf 

brale 

indenter 

D-scale 

Load 

100 kgf 

brale 

indenter 

15-N scale 

Load 

15 kgf 

30-N scale 

Load 

30 kgf 

45-N scale 

load 

45 kgf 

Tensile 

strength 

kgf/mm 2 

Approx. 

value 

Vickers 

hardness 

Load 

50kgf 

Shore 

hardness 

DPH 

Vickers 

hardness 

continued 

370 

360 

350 

340 

330 

320 

310 

300 

295 

290 

285 

280 

275 

270 

265 

260 

255 

250 

245 

240 

230 

220 

210 

200 

190 

180 

170 

160 

150 

140 

130 

120 

110 

100 

95 

90 

85 

350 

341 

331 

322 

313 

303 

294 

284 

280 

275 

270 

265 

261 

256 

252 

247 

243 

238 

233 

228 

219 

209 

200 

190 

181 

171 

162 

152 

143 

133 

124 

114 

105 

95 

90 

86 

81 

350 

341 

331 

322 

313 

303 

294 

284 

280 

275 

270 

265 

261 

256 

252 

247 

243 

238 

233 

228 

219 

209 

200 

190 

181 

171 

162 

152 

143 

133 

124 

114 

105 

95 

90 

86 

81 

350 

341 

331 

322 

313 

303 

294 

284 

280 

275 

270 

265 

261 

256 

252 

247 

243 

238 

233 

228 

219 

209 

200 

190 

181 

171 

162 

152 

143 

133 

124 

114 

105 

95 

90 

86 

81 

69.2 

68.7 

68.1 

67.6 

67.0 

66.4 

65.8 

65.2 

64.8 

64.5 

64.2 

63.8 

63.5 

63.1 

62.7 

62.4 

62.0 

61.6 

61.2 

60.7 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

109.0 

 

108.0 

 

107.0 

 

105.5 

 

104.5 

 

103.5 

 

102.0 

 

101.0 

 

99.5 

 

98.1 

96.7 

95.0 

93.4 

91.5 

89.5 

87.1 

85.0 

81.7 

78.7 

75.0 

71.2 

66.7 

62.3 

56.2 

52.0 

48.0 

41.0 

37.7 

36.6 

35.5 

34.4 

33.3 

32.2 

31.0 

29.8 

29.2 

28.5 

27.8 

27.1 

26.4 

25.6 

24.8 

24.0 

23.1 

22.2 

21.3 

20.3 

18.0 

15.7 

13.4 

11.0 

8.5 

6.0 

3.0 

0.0 

 

 

 

 

 

 

 

 

 

53.6 

52.8 

51.9 

51.1 

50.2 

49.4 

48.4 

47.5 

47.1 

46.5 

46.0 

45.3 

44.9 

44.3 

43.7 

43.1 

42.2 

41.7 

41.1 

40.3 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

79.2 

78.6 

78.0 

77.4 

76.8 

76.2 

75.6 

74.9 

74.6 

74.2 

73.8 

73.4 

73.0 

72.6 

72.1 

71.6 

71.1 

70.6 

70.1 

69.6 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

57.4 

56.4 

55.4 

54.4 

53.6 

52.3 

51.3 

50.2 

49.7 

49.0 

48.4 

47.8 

47.2 

46.4 

45.7 

45.0 

44.2 

43.4 

42.5 

41.7 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40.4 

39.1 

37.8 

36.5 

35.2 

33.9 

32.5 

31.1 

30.4 

29.5 

28.7 

27.9 

27.1 

26.2 

25.2 

24.3 

23.2 

22.2 

21.1 

19.9 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50 

 

47 

 

45 

 

42 

 

41 

 

40 

 

38 

 

37 

 

36 

 

34 

33 

32 

30 

29 

28 

26 

25 

24 

22 

21 

20 

 

 

 

 

 

 

370 

360 

350 

340 

330 

320 

310 

300 

295 

290 

285 

280 

275 

270 

265 

260 

255 

250 

245 

240 

230 

220 

210 

200 

190 

180 

170 

160 

150 

140 

130 

120 

110 

100 

95 

90 

85 

120 

115 

112 

109 

105 

103 

100 

97 

96 

94 

92 

91 

89 

87 

86 

84 

82 

81 

79 

78 

75 

71 

68 

65 

62 

59 

56 

53 

50 

46 

44 

40 

 

 

 

 

 

1) Some of the parenthesized values in the above table are not used so frequently. 

2) Approximate values were determined from “Conversion Tables” of JIS Z 8413 and Z 8438.

Appendix 

NTN 

Unit system Quantity Length L Mass M Time T Acceleration Force Stress 

Contrast table of SI and CGS system units, gravitation system units 

SI 

CGS system 

Gravitation system 

m 

cm 

m 

kg 

g 

kgfs 2 /m 

s 

s 

s 

m/s 2 

Gal 

m/s 2 

N 

dyn 

kgf 

Pa 

dyn/cm 2 

kgf/m 2 

Quantity 

 

Angle 

 

 

Length 

 

 

Area 

 

Volume 

 

 

Mass 

 

 

Time 

 

 

Speed 

 

Unit designation 

Degree 

Minute 

Second 

Meter 

Micron 

Angstrom 

Square meter 

Are 

Hector 

Cubic meter 

Liter 

kilogram 

Ton 

Weight kilogram.square second per meter 

Second 

Minute 

Hour 

Day 

Meter per second 

Knot 

Frequency and vibration Cycle 

Revolutions (rotational speed) Revolutions per minute per second 

Angular speed Radian per second 

Meter per second per second 

Acceleration 

G 

Weight kilogram 

Force Weight ton 

Dyne 

Force moment Weight kilogram meter 

Inertia moment Weight kilogram per square meter 

Stress Weight kilogram per square meter 

Weight kilogram per square meter 

Water column meter 

Pressure Mercury column meter 

Torr 

Atmospheric pressure 

Bar 

Erg 

IT calorie 

Energy Weight kilogram meter 

 

Kilowatt per hour 

Horse power per hour 

Watt 

Power rate and power Horse power 

Weight kilogram meter per second 

Pressure 

Pa 

dyn/cm 2 

kgf/m 2 

Conversion to SI unit 

Symbol Conversion rate to SI SI unit designation 

 

 

sec 

m 

 

Å 

m 2 

a 

ha 

/180 

/10 800 

/648 000 

1 

10 6 

10 10 

1 

10 2 

10 4 

 

Radian 

 

 

Meter 

 

 

Square meter 

 

m 3 1 

Cubic meter 

R.L 10 3 

kg 1 

 

t 

kgfs 2 /m 

s 

10 3 

9.806 65 

1 

Kilogram 

 

 

min 60 

Second 

h 3 600 

d 86 400 

m/s 1 

Meter per second 

kn 1 852/3 600 

s 1 pps 

rpmr/min 

rad/s 

1 

1/60 

1 

Hertz 

Per second 

Radian per second 

m/s 2 1 

Meter per second per second 

G 9.806 65 

 

kgf 9.806 65 

 

tf 9 806.65 Newton 

dyn 

kgfm 

kgfms 2 

kgf/m 2 

kgf/m 2 

mH2O 

10 5 

9.806 65 

9.806 65 

9.806 65 

9.806 65 

9 806.65 

 

Newton meter 

kilogram square meter 

Pascal or Newton per square meter 

 

 

mHg 101 325/0.76 

Pascal 

Torr 101 325/760 

atm 

bar 

erg 

calIT 

101 325 

10 5 

10 7 

4.186 8 

 

 

 

 

kgfm 9.806 65 Joule 

 

kWh 3.60010 6 

PSh 

W 

PS 

kgfm/s 

2.647 7910 6 

1 

735.5 

9.806 65 

 

 

Watt 

Energy 

J 

erg 

kgfm 

 

Symbol 

rad 

m 

m 2 

m 3 

kg 

s 

m/s 

Hz 

s 1 

rad/s 

m/s 2 

N 

Nm 

kgm 2 

Pa or N/m 2 

Pa 

J 

W 

C-6

Appendix 

NTN 

Unit system 

Quantity 

Power rate 

Temperature 

Viscosity 

Dynamic viscosity 

Magnetic flux 

Flux density 

Magnetic field strength 

SI 

W 

K 

Pas 

m 2 /s 

Wb 

T 

A/m 

CGS system 

erg/s 

˚C 

P 

St 

Mx 

Gs 

Oe 

Gravitation system 

kgfm/s 

˚C 

kgfs/m 2 

m 2 /s 

 

 

 

Conversion to SI unit 

Quantity 

Unit designation 

Symbol 

Conversion rate to SI 

SI unit designation 

Symbol 

Poise 

P 

10 1 

Viscosity 

Centi poise 

cP 

10 3 

Pascal second 

Pas 

Weight kilogram second per square meter 

kgfs/m 2 

9.806 65 


Stokes 

Centistokes 

St 

cSt 

10 4 

10 6 

Square meter per second 

m 2 /s 

Temperature 

Degree 

C 

+273.15 

Kelvin 

K 

Radioactive 

Curie 

Ci 

3.710 10 

Becquere 

Bq 

Dosage 

Roentgen 

R 

2.5810 4 

Coulomb per kilogram 

C/kg 

Absorption dosage 

Rad 

rad 

10 2 

Gray 

Gy 

Dosage equivalent 

Rem 

rem 

10 2 

Sivert 

Sv 

Magnetic flux 

Maxwell 

Mx 

10 8 

Weber 

Wb 

Flux density 

Gamma 

Gauss 

 

Gs 

10 9 

10 4 

Tesler 

T 

Magnetic field strength 

Oersted 

Oe 

10 3 /4 

Ampere per meter 

A/m 

Quantity of electricity 

Coulomb 

C 

1 

Coulomb 

C 

Potential difference 

Volt 

V 

1 

Volt 

V 

Electric resistance 

Ohm 

 

1 

Ohm 

 

Current 

Ampere 

A 

1 

Ampere 

A 

Integer multiplication of SI unit 10 

Unitmultiple 

10 18 

10 15 

10 12 

10 9 

10 6 

10 3 

10 2 

10 

10 1 

10 2 

10 3 

10 6 

10 9 

10 12 

10 15 

10 18 

Initial letter 

Name Symbol 

Exa E 

Peta P 

Tera T 

Guiga G 

Mega M 

Kilo k 

Hect h 

Daca da 

Deci d 

Centi c 

Mili m 

Micro 

Nano n 

Pico p 

Femt f 

Atto a 

C-7

Appendix 

NTN 

kgf-N conversion table 

kgf N kgf N 

kgf 

N 

0.1020 

0.2039 

0.3059 

0.4079 

0.5099 

0.6118 

0.7138 

0.8158 

0.9177 

1.0197 

1.1217 

1.2237 

1.3256 

1.4276 

1.5296 

1.6316 

1.7335 

1.8355 

1.9375 

2.0394 

2.1414 

2.2434 

2.3454 

2.4473 

2.5493 

2.6513 

2.7532 

2.8552 

2.9572 

3.0592 

3.1611 

3.2631 

3.3651 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

9.8066 

19.613 

29.420 

39.227 

49.033 

58.840 

68.646 

78.453 

88.260 

98.066 

107.87 

117.68 

127.49 

137.29 

147.10 

156.91 

166.71 

176.52 

186.33 

196.13 

205.94 

215.75 

225.55 

235.36 

245.17 

254.97 

264.78 

274.59 

284.39 

294.20 

304.01 

313.81 

323.62 

3.4670 

3.5690 

3.6710 

3.7730 

3.8749 

3.9769 

4.0789 

4.1808 

4.2828 

4.3848 

4.4868 

4.5887 

4.6907 

4.7927 

4.8946 

4.9966 

5.0986 

5.2006 

5.3025 

5.4045 

5.5065 

5.6085 

5.7104 

5.8124 

5.9144 

6.0163 

6.1183 

6.2203 

6.3223 

6.4242 

6.5262 

6.6282 

6.7302 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

61 

62 

63 

64 

65 

66 

333.43 

343.23 

353.04 

362.85 

372.65 

382.46 

392.27 

402.07 

411.88 

421.68 

431.49 

441.30 

451.10 

460.91 

470.72 

480.52 

490.33 

500.14 

509.94 

519.75 

529.56 

539.36 

549.17 

558.98 

568.78 

578.59 

588.40 

598.20 

608.01 

617.82 

627.62 

637.43 

647.24 

6.8321 

6.9341 

7.0361 

7.1380 

7.2400 

7.3420 

7.4440 

7.5459 

7.6479 

7.7499 

7.8518 

7.9538 

8.0558 

8.1578 

8.2597 

8.3617 

8.4637 

8.5656 

8.6676 

8.7696 

8.8716 

8.9735 

9.0755 

9.1775 

9.2794 

9.3814 

9.4834 

9.5854 

9.6873 

9.7893 

9.8913 

9.9932 

10.0952 

67 

68 

69 

70 

71 

72 

73 

74 

75 

76 

77 

78 

79 

80 

81 

82 

83 

84 

85 

86 

87 

88 

89 

90 

91 

92 

93 

94 

95 

96 

97 

98 

99 

657.04 

666.85 

676.66 

686.46 

696.27 

706.08 

715.88 

725.69 

735.50 

745.30 

755.11 

764.92 

774.72 

784.53 

794.34 

804.14 

813.95 

823.76 

833.56 

843.37 

853.18 

862.98 

872.79 

882.60 

892.40 

902.21 

912.02 

921.82 

931.63 

941.44 

951.24 

961.05 

970.86 

[How to read the table] 

For example, for conversion from 10kgf to N read 10 on center stage of 1st row box and then read the right-side N. 

10kgf is equivalent to 98.066 upon reading. Furthermore, for conversion from 10N to kfg read the right side kgf box. 

10N is equivalent to 1.0197kg upon reading. 

1kgf9.80665N 

1N0.101972kgf 

C-8

Appendix 

NTN 

Viscosity conversion table 


mm 2 /s 

Saybolt 

SUS (sec) 

Redwood 

R" (sec) 

Engler 

E (deg.) 


mm 2 /s 

Saybolt 

SUS (sec) 

Redwood 

R" (sec) 

Engler 

E (deg.) 

2.7 

4.3 

5.9 

7.4 

8.9 

35 

40 

45 

50 

55 

32.2 

36.2 

40.6 

44.9 

49.1 

1.18 

1.32 

1.46 

1.60 

1.75 

103 

108 

119 

130 

141 

475 

500 

550 

600 

650 

419 

441 

485 

529 

573 

13.5 

14.2 

15.6 

17.0 

18.5 

10.4 

11.8 

13.1 

14.5 

15.8 

60 

65 

70 

75 

80 

53.5 

57.9 

62.3 

67.6 

71.0 

1.88 

2.02 

2.15 

2.31 

2.42 

152 

163 

173 

184 

195 

700 

750 

800 

850 

900 

617 

661 

705 

749 

793 

19.9 

21.3 

22.7 

24.2 

25.6 

17.0 

18.2 

19.4 

20.6 

23.0 

85 

90 

95 

100 

110 

75.1 

79.6 

84.2 

88.4 

97.1 

2.55 

2.68 

2.81 

2.95 

3.21 

206 

217 

260 

302 

347 

950 

1 000 

1 200 

1 400 

1 600 

837 

882 

1 058 

1 234 

1 411 

27.0 

28.4 

34.1 

39.8 

45.5 

25.0 

27.5 

29.8 

32.1 

34.3 

120 

130 

140 

150 

160 

105.9 

114.8 

123.6 

132.4 

141.1 

3.49 

3.77 

4.04 

4.32 

4.59 

390 

433 

542 

650 

758 

1 800 

2 000 

2 500 

3 000 

3 500 

1 587 

1 763 

2 204 

2 646 

3 087 

51 

57 

71 

85 

99 

36.5 

38.8 

41.0 

43.2 

47.5 

170 

180 

190 

200 

220 

150.0 

158.8 

167.5 

176.4 

194.0 

4.88 

5.15 

5.44 

5.72 

6.28 

867 

974 

1 082 

1 150 

1 300 

4 000 

4 500 

5 000 

5 500 

6 000 

3 526 

3 967 

4 408 

4 849 

5 290 

114 

128 

142 

156 

170 

51.9 

56.5 

60.5 

64.9 

70.3 

240 

260 

280 

300 

325 

212 

229 

247 

265 

287 

6.85 

7.38 

7.95 

8.51 

9.24 

1 400 

1 510 

1 630 

1 740 

1 850 

6 500 

7 000 

7 500 

8 000 

8 500 

5 730 

6 171 

6 612 

7 053 

7 494 

185 

199 

213 

227 

242 

75.8 

81.2 

86.8 

92.0 

97.4 

350 

375 

400 

425 

450 

309 

331 

353 

375 

397 

9.95 

10.7 

11.4 

12.1 

12.8 

1 960 

2 070 

2 200 

9 000 

9 500 

10 000 

7 934 

8 375 

8 816 

256 

270 

284 

C-9

Appendix 

NTN 

Ordinary tolerance for cutting dimensions 

JIS B 0405 

Ordinary tolerance is applied to cutting dimensions for 

which special accuracy is not required functionally and, 

therefore, applicable tolerances are indicated in batch, 

without individual indication of them, in relevant 

specification, drawings, etc. 

Ordinary tolerances shall be indicated by either one of 

the following methods (1) and (2). 

(1) Numerical value table for each dimensional division 

(2) Applicable Standard No. and tolerance class 

Ex. Ordinary tolerance shall conform to the "Medium 

Class" specified in JIS B 0405. 

Dimensional division 

0.5 and over 3 incl. 

Over 3 6 incl. 

Over 6 

Over 30 

Over 120 

Class 

30 incl. 

120 incl. 

315 incl. 


Over 1000 2000 incl. 

Fine class 

(Class-12) 

0.05 

0.1 

0.15 

0.2 

0.3 

0.5 

Medium class 

(Class-14) 

0.1 

0.2 

0.3 

0.5 

0.8 

1.2 

Unit : mm 

Coarse class 

(Class-16) 

 

0.2 

0.5 

0.8 

1.2 

2 

3 

Reference: The numerical values given above every each of “Fine Class”, 

“Medium class” and “Coarse Class” match “Fine series, Medium 

series”, and Coarse series” specified in ISO 2768 

(Permissible Machining Variations in Dimensions without Tolerance 

I di ti ) 

Ordinary tolerances for castings 

JIS B 0407 

This Standard specifies the ordinary tolerances for the 

as-casted length and wall thickness dimensions 

(hereinafter referred to as" ordinary tolerance") of gray 

castings and spherical graphite 

castings molded using sand molds (excluding precision 

mold and other equivalent). 

The ordinary tolerance shall be indicated by either one 

of the following methods (1) and (2). 



Ex. JIS B 0407, Coarse class 

Ordinary tolerance for wall thickness 

Unit : mm 

Material Gray castings Spherical graphite castings 


Class 

Fine class Coarse class Fine class Coarse class 

10 incl. 




Dimension-A for draft angle 

Dimensional divisionl 

18 incl. 







1 

1.5 

2 

2 

Unit : mm 

Dimension 

A (max) 

1 

1.5 

2 

2.5 

3.5 

6 

9 

Remarks : l means l1 and l2 in the above sketch. 

A means A1, A2 in the above sketch. 

1.5 

2 

3 

3.5 

draft A1 

angle l1 

l1 

A1 

1.2 

1.5 

2 

2.5 

2 

2.5 

3 

4 

Specified length 

Specified wall thickness 

A2 draft A2 

angle l2 

Ordinary tolerances for press-formed metal parts 

JIS B 0408 


punching, bending and drawing dimensions, bending 

angle of press-formed metal parts (hereinafter referred to 

as "ordinary tolerance"). 

Ordinary tolerance is applied to the dimensions for 





Ordinary tolerance shall be indicated by either one of 




Ex. JIS B0408, Class-A 

l2 

Ordinary tolerance for length 

Unit : mm 

Material Gray castings Spherical graphite castings 


Class 

Fine class Coarse class Fine class Coarse class 

120 incl. 





Over 1600 3150 incl. 

1 

1.5 

2 

3 

4 

 

1.5 

2 

3 

4 

6 

10 

1.5 

2 

2.5 

4 

5 

 

2 

2.5 

3.5 

5 

7 

10 

C-10

Appendix 

NTN 

Ordinary tolerance for punching, bending and drawing dimensions 

Unit : mm 

Class 


Class-A Class-B Class-C Class-D Class-E 

30 incl. 




Over 1000 2000 incl. 

0.1 

0.15 

0.2 

0.3 

0.5 

0.15 

0.25 

0.4 

0.7 

1.1 

0.25 

0.45 

0.6 

1.1 

1.8 

0.4 

0.7 

1 

1.8 

3 

0.6 

1.1 

1.6 

2.8 

4.5 

Ordinary tolerance for bending angle 

Unit : degree 

Type of bending 

Class 

Class 

B, C 

Class 

D, E 

Perpendicular bending 

Other bending 

1 

1.5 

2 

3 

Remarks: The ordinary tolerance for bending angle 

shall be applied to Class-A tolerance. 

Ordinary tolerance for die casts 

JIS B 0409 

This Standard specifies the ordinary tolerance for the 

as-casted dimensions of zinc allow die casts and 

aluminum alloy die casts. 




(2) Applicable standard No. Ex.:JIS B 0409 

Ordinary tolerance for dimensions 

Unit : mm 

Classification by 

application 

Portions casted by solid die and movable die 

Perpendicular to die 

split surface l2 

Portions casted 

by movable core 

l2 

Dimensional 

division 

Parallel to 

die split 

surface 

Projected area of castings 

perpendicular to die split 

surface cm 2 

600 and 

below 

over 600 

2400 incl. 

Projected area of casting 

portion perpendicular 

to moving direction of 

movable core cm 2 

150 and 

below 

over 150 

600 incl. 

l1 

l2 

Die split 

surface 

30 incl. 

0.25 

0.5 

0.6 

0.5 

0.6 

l2 


0.3 

0.5 

0.6 

0.5 

0.6 

l1 


0.35 

0.6 

0.6 

0.6 

0.6 


0.45 

0.7 

0.7 

0.7 

0.7 





0.5 

0.55 

0.6 

0.7 

0.8 

0.9 

1 

 

0.8 

0.9 

1 

 

0.8 

0.9 

1 

 

0.8 

0.9 

1 

 

l2 

l1 

l2 

l1 

l3 

Die split 

surface 


0.8 

 

 

 

 


0.9 

 

 

 

 


1 

 

 

 

 


1.1 

 

 

 

 

Note 1) The dimensional tolerance for l1 shall be applied to partial dimension of die split surface which 

does not influence the length. 

2) “Projected area of castings” means the circumference internal projected area of as-casted 

castings. 

C-11

Appendix 

NTN 

Maximum draft angle value 

Chart showing the relationship of drafted portion length (h) vs draft angle dimension () 

Draft angle 

 

h 

Material 

Length of 

draft portion(mm) 

3 and less 

Over 3 - 10 incl. 



h 

Draft angle 

Aluminum 

alloy 

10 

5 

3 

2 

Unit : degree 

Zinc 

alloy 

6 

3 

2 

1.5 

Draft angle dimensionmm 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Zinc alloy 

 

Length of draft portionh 

h 

 

 

h 

Ordinary tolerances for sheared metal plates 

JIS B 0410 


shearing width and ordinary tolerances for the 

straightness and perpendicularity (hereinafter generically 

referred to as ordinary tolerance) of metal plates of 12mm 

and less in thickness which were sheared by direct shearing 

machines such as gear pusher, square shear, etc. 




(2) Applicable standard No. and tolerance class 

Ex. 1. JIS B 0410, Class-B 

2. Cutting width, straightness: JIS B 0410, Class-B 

Perpendicularity: JIS B 0410, Class-A 

Definition of the terms: The terms used in this Standard 

are as defined in JIS B 0111 (Terminology relating to 

press machines) and, in addition, defined as follows. 

(1) Cutting width: Distance from one side sheared by 

shear cutter to opposite side, as illustrated in Fig. b 

(2) Cutting length: length of one side sheared by shear 

cutter, as illustrated in Fig. l. 

Ordinary tolerance for shearing width 

Classification by plate thickness 

Tolerance class 

Cutting width division 

120 and less 

Over 120 - 315 incl. 

Over 315 - 1000 incl. 

Over 1000 - 2000 incl. 

Over 2000 - 3150 incl. 

1.6 and less 

Class-A 

0.2 

0.3 

0.5 

0.8 

1.0 

Class-B 

0.5 

0.6 

1.0 

1.2 

1.4 

Over 1.6 3 incl. 

Class-A 

0.3 

0.4 

0.5 

0.8 

1.0 

Class-B 

0.5 

0.8 

1.2 

1.6 

1.6 

Remarks: non-applicable to cutting length exceeding 3150 mm. 


Class-A 

0.7 

0.9 

1.6 

2.0 

2.8 

Class-B 

1.2 

1.6 

2.0 

3.0 

3.0 

Unit : mm 


Class-A Class-B 

1.6 

2.0 

2.5 

3.0 

3.5 

product 

b 

Sheared side 

product 

b 

l 

Sheared side 

C-12

Appendix 

NTN 

Ordinary tolerance for straightness 

Unit : mm 

Classification by plate thickness 1.6 and less Over 1.6 3 incl. Over 3 6 incl. 



Class-A Class-B Class-A Class-B Class-A Class-B 

120 and less 

Over 120 - 315 incl. 

Over 315 - 1000 incl. 

Over 1000 - 2000 incl. 

Over 2000 - 3150 incl. 

0.2 

0.3 

0.4 

0.6 

0.9 

0.3 

0.5 

0.9 

1.2 

1.6 

0.2 

0.3 

0.5 

0.8 

1.0 

0.3 

0.6 

1.0 

1.6 

2.2 

0.5 

1.0 

1.4 

2.5 

2.8 

0.8 

1.6 

2.0 

3.0 

4.5 

Remarks: Non-applicable to cutting width of less than 20 times as much as 

plate thickness or cutting width of less than 30mm. 

Ordinary tolerance for straightness 

Unit : mm 

Classification by plate thickness 

3 and less Over 3 6 incl. Over 6 12 incl. 



Class-A Class-B Class-A Class-B Class-A Class-B 

120 and less 

Over 120 - 315 incl. 

Over 315 - 1000 incl. 

Over 1000 - 2000 incl. 

Over 2000 - 3150 incl. 

0.3 

0.6 

1.6 

3.0 

4.5 

0.5 

1.2 

3.0 

6.0 

9.0 

0.5 

0.8 

2.0 

4.0 

5.5 

1.0 

1.6 

3.0 

6.0 

9.0 

 

 

 

 

 

1.6 

2.0 

3.0 

6.0 

9.0 

Ordinary tolerance for sintered metal parts 

JIS B 0411 

This Standard specifies the ordinary tolerance which is 

applied to the machining dimensions of sintered 

mechanical parts and sintered oil-contained bearing, of 

sintered metal parts, but excluding machining methods 

other (e.g. cutting, etc.) than the machining method 

specific for sintered metal parts. 

Ordinary tolerance is applied to the dimensions for 









Ex. JIS B0411, Fine Class 

Definition of terms: The terms used in this Standard are 

as defined below. 

(1) Width: Perpendicular dimension against 

compressing direction in compressive molding of 

powders, as illustrated in Fig. a. 

(2) Height: Dimension parallel to compressing direction 

in molding of powders, as illustrated in Fig. b. 

Ordinary tolerance for width 

class 

Fine class 


6 and less 

0.05 

Over 6 - 30 incl. 0.1 

Over 30 - 120 incl. 0.15 

Over 120 - 315 incl. 0.2 

Ordinary tolerance for height 

class 

Fine class 


6 and less 

0.1 


0.2 

Over 30 - 120 incl. 0.3 

Unit : mm 

Medium class Coarse class 

0.1 0.2 

0.2 0.5 

0.3 0.8 

0.5 1.2 

Unit : mm 


0.2 0.6 

0.5 1 

0.8 1.8 

Compressing 

direction 

Compressing 

direction 

b 

a1 

a2 

a1 

a2 

b1 

b2 

a3 

a3 

Class: The ordinary tolerance class shall be three classes of “Fine 

Class”, “Medium Class” and “Coarse class”. 

Reference: The numerical values every each class of “Fine Class”, 

“Medium Class” and “Coarse class” match “Fine Series, 

Medium Series and Coarse Series specified in ISO 2768 

(Permissible machining variations in dimensions without 

tolerance indication) 

C-13

Appendix 

NTN 

Ordinary tolerance for steel castings 

JIS B 0412 


length and as-casted wall thickness (hereinafter referred 

to as "ordinary tolerance") of steel castings casted by 

sand molds. 





Ex. JIS B0412, Medium Class 

Tolerance class: The ordinary tolerance class shall be 

three classes of "Fine Class", "Medium Class" and 

"Coarse Class". 

Dimension-A for draft angle 

Dimensional divisionl 

18 incl. 







Unit : mm 

Dimension 

A (max) 

1.4 

2 

2.8 

3.5 

4.5 

5.5 

7 

Remarks: l means l1 and l2 in the above sketch. 

A means A1, A2 in the above sketch. 

draft A1 

angle l1 

l1 

A1 

Specified length 

Specified wall thickness 

A2 

draft 

angle 

l2 

A2 

l2 



class 

120 and less 

Over 120 - 315 incl. 

Over 315 - 630 incl. 

Over 630 - 1250 incl. 

Over 1250 - 2500 incl. 

Over 2500 - 5000 incl. 

Over 5000 - 10000 incl. 

18 and less 



Over 120 - 250 incl. 

Over 250 - 400 incl. 

Over 400 - 630 incl. 

Over 630 - 1000 incl. 

Fine class 

1.8 

2.5 

3.5 

5 

9 

 

 



1.4 

2 

 

 

 

 

 


2.8 

4 

5.5 

8 

14 

20 

 

2.2 

3 

4.5 

5.5 

7 

9 

 

Unit : mm 

4.5 

6 

9 

12 

22 

35 

63 

Unit : mm 

class Fine class Medium class Coarse class 

3.5 

5 

7 

9 

11 

14 

18 

Remarks: “Fine Class” shall be applied to minor steel castings subjected to 

special accuracy. 

Ordinary tolerance for aluminum alloy castings 

JIS B 0414 

This Standard specifies the ordinary tolerances 

(hereinafter referred to as ordinary tolerance) for the 

length and wall thickness of aluminum alloy castings 

(hereinafter referred to as castings molded by sand 

mold and mold. However, this Standard is not applied to 

castings molded by precision molds using Lost Wax 

Method, etc. 




(2) Applicable Standard No. , classification and 

tolerance class by casting mold 

Ex. JIS 0414 , Sand mold, Coarse Class 

Definition of terms: The terms used in this Standard are 

as defined below. 

Mold split surface: Two or more splitted surfaces of 

mold for drafting a model or a castings out of a 

casting mold. 

Length including 

mold split surface 

Length excluding mold 

split surface 

Mold split surface 

C-14

Appendix 

NTN 


Type 

Castings by 

sand mold 

Castings by 

casting mold 

Dimensional 

division 

class 

Portion 

including no 

mold split 

surface 

Portion 

including 

mold split 

surface 

Portion 

including no 

mold split 

surface 

Portion 

including 

mold split 

surface 

Fine 

class 

0.5 

0.8 

0.3 

0.5 

50 incl. 

Coarse 

class 

1.1 

1.5 

0.5 

0.6 

Over 50 

120 incl. 

Fine 

class 

0.7 

1.1 

0.45 

0.7 

Coarse 

class 

1.2 

1.8 

0.7 

0.8 

Over 120 

250 incl. 

Fine 

class 

0.9 

1.4 

0.55 

0.9 

Coarse 

class 

1.4 

2.2 

0.9 

1.0 

Over 250 

400 incl. 

Fine 

class 

1.1 

1.8 

0.7 

1.1 

Coarse 

class 

1.8 

2.8 

1.1 

1.2 

Note 1) Conforming to Appendix-2 to JIS B 0404 (Rule for Ordinary Dimensional Tolerances) 

Over 400 

800 incl. 

Fine 

class 

1.6 

2.5 

1.0 

1.6 

Coarse 

class 

2.5 

4.0 

1.6 

1.8 

Over 800 

1600 incl. 

Fine 

class 

 

 

 

 

Coarse 

class 

4 

6 

 

 

Over 1600 

3150 incl. 

Fine 

class 

 

 

 

 

Coarse 

class 

7 

 

 

 

Unit : mm 

Ref. 1 

Correspond to standard 

tolerance grade 

Fine Coarse 

class class 

15 

16 

14 

15 

16 

17 

15 

15 



Type 

Castings by 

sand mold 


Max. length of castings 

120 incl. 




Fine 

class 

0.6 

0.7 

0.8 

1.0 

6 incl. 

Coarse 

class 

1.2 

1.3 

1.4 

1.6 

Fine 

class 

0.7 

0.8 

0.9 

1.1 

Over 6 

10 incl. 

Coarse 

class 

1.4 

1.5 

1.6 

1.8 

Fine 

class 

0.8 

0.9 

1.0 

1.2 

Over 10 

18 incl. 

Coarse 

class 

1.6 

1.7 

1.8 

2.0 

Fine 

class 

0.9 

1.0 

1.1 

1.3 

Over 18 

30 incl. 

Coarse 

class 

1.8 

1.9 

2.0 

2.2 

Fine 

class 

 

1.2 

1.3 

1.5 

Over 30 

50 incl. 

Unit : mm 

Coarse 

class 

 

2.3 

2.4 

2.6 

Castings by 

casting mold 

120 incl. 



0.3 

0.4 

0.5 

0.7 

0.8 

0.9 

0.4 

0.5 

0.6 

0.9 

1.0 

1.1 

0.5 

0.6 

0.7 

1.1 

1.2 

1.3 

0.6 

0.7 

0.8 

1.3 

1.4 

1.5 

 

0.9 

1.0 

 

1.8 

1.9 

Maximum draft angle value 

Unit : degree 

Classification by draft angle Outer Inner 

Tolerance class Fine Coarse Fine Coarse 

Type of castings class class class class 

Fine class 

Coarse class 

1 2 2 3 

Remarks: The numerical values in this table shall be applied to draft portions 

of 400 mm and less in length. 

Outer draft angle 

Inner draft angle 

C-15

Appendix 

NTN 

Dimensional tolerance for shaft 

Diameter division 

a13 c12 d6 e6 e13 f5 f6 g5 g6 

mm 

Over incl. High Low High Low High Low High Low High Low High Low High Low High Low High Low 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

270 

280 

290 

300 

310 

320 

340 

360 

380 

410 

460 

520 

580 

660 

740 

820 

920 

1 050 

1 200 

1 350 

1 500 

1 650 

 

 

 

 

 

450 

500 

560 

630 

700 

710 

800 

820 

920 

950 

1 090 

1 150 

1 210 

1 380 

1 460 

1 540 

1 730 

1 860 

2 090 

2 240 

2 470 

2 620 

 

 

 

 

 

70 

80 

95 

110 

120 

130 

140 

150 

170 

180 

200 

210 

230 

240 

260 

280 

300 

330 

360 

400 

440 

480 

 

 

 

 

 

190 

230 

275 

320 

370 

380 

440 

450 

520 

530 

600 

610 

630 

700 

720 

740 

820 

850 

930 

970 

1 070 

1 110 

 

 

 

 

 

30 

40 

50 

65 

80 

100 

120 

145 

170 

190 

210 

230 

260 

290 

320 

350 

390 

38 

49 

61 

78 

96 

119 

142 

170 

199 

222 

246 

270 

304 

340 

376 

416 

468 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

125 

135 

145 

160 

170 

195 

220 

28 

34 

43 

53 

66 

79 

94 

110 

129 

142 

161 

175 

189 

210 

226 

261 

298 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

125 

135 

 

 

 

 

 

200 

245 

302 

370 

440 

520 

612 

715 

820 

920 

1 015 

1 105 

 

 

 

 

 

10 

13 

16 

20 

25 

30 

36 

43 

50 

56 

62 

68 

 

 

 

 

 

15 

19 

24 

29 

36 

43 

51 

61 

70 

79 

87 

95 

 

 

 

 

 

10 

13 

16 

20 

25 

30 

36 

43 

50 

56 

62 

68 

76 

80 

86 

98 

110 

18 

22 

27 

33 

41 

49 

58 

68 

79 

88 

98 

108 

120 

130 

142 

164 

188 

4 

5 

6 

7 

9 

10 

12 

14 

15 

17 

18 

20 

 

 

 

 

 

9 

11 

14 

16 

20 

23 

27 

32 

35 

40 

43 

47 

 

 

 

 

 

4 

5 

6 

7 

9 

10 

12 

14 

15 

17 

18 

20 

22 

24 

26 

28 

30 

12 

14 

17 

20 

25 

29 

34 

39 

44 

49 

54 

60 

66 

74 

82 

94 

108 


j5 js5 j6 js6 j7 k4 k5 k6 m5 

mm 

Over incl. High Low High Low High Low High Low High Low High Low High Low High Low High Low 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

3 

4 

5 

5 

6 

6 

6 

7 

7 

7 

7 

7 

 

 

 

 

 

2 

2 

3 

4 

5 

7 

9 

11 

13 

16 

18 

20 

 

 

 

 

 

2.5 

3 

4 

4.5 

5.5 

6.5 

7.5 

9 

10 

11.5 

12.5 

13.5 

 

 

 

 

 

2.5 

3 

4 

4.5 

5.5 

6.5 

7.5 

9 

10 

11.5 

12.5 

13.5 

 

 

 

 

 

6 

7 

8 

9 

11 

12 

13 

14 

16 

16 

18 

20 

 

 

 

 

 

2 

2 

3 

4 

5 

7 

9 

11 

13 

16 

18 

20 

 

 

 

 

 

4 

4.5 

5.5 

6.5 

8 

9.5 

11 

12.5 

14.5 

16 

18 

20 

22 

25 

28 

33 

39 

4 

4.5 

5.5 

6.5 

8 

9.5 

11 

12.5 

14.5 

16 

18 

20 

22 

25 

28 

33 

39 

8 

10 

12 

13 

15 

18 

20 

22 

25 

26 

29 

31 

 

 

 

 

 

4 

5 

6 

8 

10 

12 

15 

18 

21 

26 

28 

32 

 

 

 

 

 

5 

5 

6 

8 

9 

10 

13 

15 

18 

20 

22 

25 

 

 

 

 

 

1 

1 

1 

2 

2 

2 

3 

3 

4 

4 

4 

5 

 

 

 

 

 

6 

7 

9 

11 

13 

15 

18 

21 

24 

27 

29 

32 

 

 

 

 

 

1 

1 

1 

2 

2 

2 

3 

3 

4 

4 

4 

5 

 

 

 

 

 

9 

10 

12 

15 

18 

21 

25 

28 

33 

36 

40 

45 

44 

50 

56 

66 

78 

1 

1 

1 

2 

2 

2 

3 

3 

4 

4 

4 

5 

0 

0 

0 

0 

0 

9 

12 

15 

17 

20 

24 

28 

33 

37 

43 

46 

50 

 

 

 

 

 

4 

6 

7 

8 

9 

11 

13 

15 

17 

20 

21 

23 

 

 

 

 

 

C-16

Appendix 

NTN 

 

 

High Low High Low High Low High Low High Low High Low High Low High Low High Low High Low 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

 

 

 

 

 

High 

4 

4 

5 

6 

7 

8 

10 

12 

14 

16 

18 

20 

 

 

 

 

 

12 

15 

18 

21 

25 

30 

35 

40 

46 

52 

57 

63 

70 

80 

90 

106 

126 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

 

 

 

 

 

5 

6 

8 

9 

11 

13 

15 

18 

20 

23 

25 

27 

 

 

 

 

 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

8 

9 

11 

13 

16 

19 

22 

25 

29 

32 

36 

40 

44 

50 

56 

66 

78 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

12 

15 

18 

21 

25 

30 

35 

40 

46 

52 

57 

63 

70 

80 

90 

105 

125 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

18 

22 

27 

33 

39 

46 

54 

63 

72 

81 

89 

97 

110 

125 

140 

165 

195 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

30 

36 

43 

52 

62 

74 

87 

100 

115 

130 

140 

155 

175 

200 

230 

260 

310 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

48 

58 

70 

84 

100 

120 

140 

160 

185 

210 

230 

250 

280 

320 

360 

420 

500 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

75 

90 

110 

130 

160 

190 

220 

250 

290 

320 

360 

400 

440 

500 

560 

660 

780 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

180 

220 

270 

330 

390 

460 

540 

630 

720 

810 

890 

970 

 

 

 

 

 

2 

2 

2.5 

3 

 

Basic tolerance 

11 

13 

15 

17 

20 

21 

23 

26 

30 

34 

40 

48 

33 

38 

45 

51 

57 

62 

67 

 

 

 

 

 

20 

23 

27 

31 

34 

37 

40 

 

 

 

 

 

39 

45 

52 

60 

66 

73 

80 

88 

100 

112 

132 

156 

3.5 

4 

5 

6 

7 

8 

9 

10 

 

 

 

 

 

2 

2 

2.5 

3 

Low High Low High Low High Low High Low High Low High Low IT2 IT3 IT5 IT7 

4 13 8 16 8 17 12 20 12 23 15 27 15 1.5 2.5 5 12 

6 16 10 19 10 21 15 24 15 28 19 34 19 1.5 2.5 6 15 

7 20 12 23 12 26 18 29 18 34 23 41 23 2 3 8 18 

8 24 15 28 15 31 22 35 22 41 28 49 28 2.5 4 9 21 

9 28 17 33 17 37 26 42 26 50 34 59 34 2.5 4 11 25 

20 

23 

27 

31 

34 

37 

40 

44 

50 

56 

66 

78 

45 

52 

61 

70 

79 

87 

95 

 

 

 

 

 

32 

37 

43 

50 

56 

62 

68 

 

 

 

 

 

51 

59 

68 

79 

88 

98 

108 

122 

138 

156 

186 

218 

32 

37 

43 

50 

56 

62 

68 

78 

88 

100 

120 

140 

60 

62 

73 

76 

88 

90 

93 

106 

109 

113 

126 

130 

144 

150 

166 

172 

194 

199 

225 

235 

266 

276 

316 

326 

378 

408 

41 

43 

51 

54 

63 

65 

68 

77 

80 

84 

94 

98 

108 

114 

126 

132 

150 

155 

175 

185 

210 

220 

250 

260 

300 

330 

71 

73 

86 

89 

103 

105 

108 

123 

126 

130 

146 

150 

165 

171 

189 

195 

220 

225 

255 

265 

300 

310 

355 

365 

425 

455 

41 

43 

51 

54 

63 

65 

68 

77 

80 

84 

94 

98 

108 

114 

126 

132 

150 

155 

175 

185 

210 

220 

250 

260 

300 

330 

3 

4 

5 

7 

8 

9 

10 

 

 

 

 

 

5 

6 

8 

10 

12 

13 

15 

 

 

 

 

 

13 

15 

18 

20 

23 

25 

27 

 

 

 

 

 

3.5 

4 

5 

6 

7 

8 

9 

10 

 

 

 

 

 

30 

35 

40 

46 

52 

57 

63 

70 

80 

90 

105 

125 


mm 

Over incl. 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

 

 


mm 

Over incl. 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

Unit : 

Unit : 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

C-17

Appendix 

NTN 

Dimensional tolerance for housing bore 


E7 E10 E11 E12 F6 F7 F8 G6 G7 

H6 

mm 

Over incl. High Low High Low High Low High Low High Low High Low High Low High Low High Low High Low 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

1 800 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

32 

40 

50 

61 

75 

90 

107 

125 

146 

162 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

68 

83 

102 

124 

150 

180 

212 

245 

285 

320 

355 

385 

 

 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

125 

135 

 

 

95 

115 

142 

170 

210 

250 

292 

335 

390 

430 

485 

535 

 

 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

125 

135 

140 

175 

212 

250 

300 

360 

422 

485 

560 

630 

695 

765 

 

 

 

 

20 

25 

32 

40 

50 

60 

72 

85 

100 

110 

125 

135 

 

 

 

 

 

 

 

 

18 

22 

27 

33 

41 

49 

58 

68 

79 

88 

98 

108 

120 

130 

142 

164 

188 

212 

 

Unit : 


K7 M6 M7 N6 

N7 P6 P7 R6 R7 

mm 

Over incl. High Low High Low High Low High Low High Low High Low High Low High Low High Low High Low 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

1 800 

1 800 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

1 800 

2 000 

182 

198 

215 

240 

260 

300 

345 

3 

4 

4 

4 

5 

5 

7 

8 

0 

0 

0 

0 

0 

0 

125 

135 

145 

160 

170 

195 

220 

13 

15 

18 

21 

24 

27 

29 

32 

44 

50 

56 

66 

78 

92 

7 

9 

10 

12 

13 

16 

17 

18 

0 

0 

0 

0 

0 

0 

 

 

390 240 0 

2 6 3 9 1 9 

2 000 

2 

2 

2 

7 

9 

11 

5 

6 

6 

10 

12 

15 

3 

4 

4 

12 

15 

17 

0 

0 

0 

18 

21 

25 

28 

33 

36 

40 

45 

70 

80 

90 

105 

125 

150 

 

 

4 

5 

6 

8 

8 

9 

10 

10 

26 

30 

34 

40 

48 

58 

 

 

20 

24 

28 

33 

37 

41 

46 

50 

70 

80 

90 

106 

126 

150 

 

 

0 

0 

0 

0 

0 

0 

0 

0 

26 

30 

34 

40 

48 

58 

12 

15 

18 

21 

25 

30 

35 

40 

46 

52 

57 

63 

96 

100 

124 

145 

173 

208 

5 

7 

9 

11 

12 

14 

16 

20 

22 

25 

26 

27 

44 

50 

56 

66 

78 

92 

13 

16 

20 

24 

28 

33 

38 

45 

57 

62 

67 

88 

100 

112 

132 

156 

184 

10 

13 

16 

20 

25 

30 

36 

43 

50 

56 

62 

68 

76 

80 

86 

98 

110 

120 

4 

4 

5 

7 

8 

9 

10 

22 

28 

34 

41 

50 

60 

71 

83 

96 

108 

119 

131 

146 

160 

176 

203 

235 

270 

10 

13 

16 

20 

25 

30 

36 

43 

50 

56 

62 

68 

76 

80 

86 

98 

110 

120 

21 

26 

30 

28 

35 

43 

53 

64 

76 

90 

106 

122 

137 

151 

165 

186 

205 

226 

263 

305 

350 

51 14 60 41 70 

14 66 47 79 

16 

17 

44 

50 

56 

66 

78 

92 

16 

19 

23 

28 

33 

39 

45 

12 52 

73 

80 

114 

130 

146 

171 

203 

242 

9 

12 

15 

18 

36 

51 

55 

78 

88 

100 

120 

140 

170 

17 

21 

26 

31 

37 

45 

52 

61 

87 

95 

122 

138 

156 

186 

213 

262 

10 

13 

16 

20 

25 

30 

36 

43 

50 

56 

62 

68 

76 

80 

86 

98 

110 

120 

8 

9 

11 

14 

17 

12 

14 

17 

20 

25 

29 

34 

39 

44 

49 

54 

60 

66 

74 

82 

94 

108 

124 

20 

24 

29 

35 

42 

4 

5 

6 

7 

9 

10 

12 

14 

15 

17 

18 

20 

22 

24 

26 

28 

30 

32 

12 

16 

20 

24 

16 

20 

24 

28 

34 

40 

47 

54 

61 

69 

75 

83 

92 

104 

116 

133 

155 

182 

20 

25 

31 

37 

29 42 

4 

5 

6 

7 

9 

10 

12 

14 

15 

17 

18 

20 

22 

24 

26 

28 

30 

32 

11 

13 

16 

20 

8 

9 

11 

13 

16 

19 

22 

25 

29 

32 

36 

40 

44 

50 

56 

66 

78 

92 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

23 

28 

34 

41 

25 50 

21 

24 

51 

59 

35 

44 

54 

66 

37 

47 

56 

69 

56 81 

28 68 58 83 

61 86 

68 97 

33 79 71 100 

75 104 

36 88 

85 117 74 

89 121 78 

97 133 87 

41 98 

103 139 93 

45 108 

113 153 103 

119 159 109 

78 148 

150 194 150 

155 199 155 

88 168 

175 225 175 

185 235 185 

100 190 

210 266 210 

220 276 220 

120 225 

250 316 250 

260 326 260 

140 265 

300 378 300 

330 408 330 

170 320 

370 462 370 

400 

30 60 

32 62 

38 73 

41 76 

48 88 

50 90 

53 93 

60 106 

63 109 

67 113 

126 

130 

144 

150 

166 

172 

220 

225 

225 

265 

300 

310 

355 

365 

425 

455 

520 

550 

C-18

Appendix 

NTN 

H7 H8 H9 H10 H11 H13 J6 Js6 J7 Js7 K5 

High Low 

12 

15 

18 

21 

25 

30 

35 

52 

57 

63 

70 

80 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

High Low High Low High Low High Low High Low High Low High Low High Low High Low High Low 

18 

22 

27 

33 

39 

46 

54 

81 

89 

97 

110 

125 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

30 

36 

43 

52 

62 

74 

87 

130 

140 

155 

175 

200 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

48 

58 

70 

84 

100 

120 

140 

210 

230 

250 

280 

320 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

75 

90 

110 

130 

160 

190 

220 

320 

360 

400 

440 

500 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

180 

220 

270 

330 

390 

460 

540 

810 

890 

970 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

5 

5 

6 

8 

10 

13 

16 

25 

29 

33 

3 

4 

5 

5 

6 

6 

6 

7 

7 

7 

4 

4.5 

5.5 

6.5 

8 

9.5 

11 

16 

18 

20 

22 

25 

4 

4.5 

5.5 

6.5 

8 

9.5 

11 

16 

18 

20 

22 

25 

6 

8 

10 

12 

14 

18 

22 

36 

39 

43 

6 

7 

8 

9 

11 

12 

13 

16 

18 

20 

6 

7.5 

9 

10.5 

12.5 

15 

17.5 

26 

28.5 

31.5 

35 

40 

6 

7.5 

9 

10.5 

40 0 63 0 100 0 160 0 250 0 630 0 18 7 12.5 12.5 26 14 20 20 3 15 

46 0 72 0 115 0 185 0 290 0 720 0 22 7 14.5 14.5 30 16 23 23 2 18 

 

 

90 0 140 0 230 0 360 0 560 0 0 28 28 45 45 

105 0 165 0 260 0 420 0 660 0 0 33 33 52.5 52.5 

125 0 195 0 310 0 500 0 780 0 0 39 39 62.5 62.5 

 

 

 

 

 

 

 

 

 

12.5 

15 

17.5 

26 

28.5 

31.5 

35 

40 

0 

1 

2 

1 

2 

3 

2 

3 

3 

2 

 

 

5 

5 

6 

8 

9 

10 

13 

20 

22 

25 

 

 

Unit : 


mm 

Over incl. 

3 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

1 800 

6 

10 

18 

30 

40 

50 

65 

80 

100 

120 

140 

160 

180 

200 

225 

250 

280 

315 

355 

400 

450 

500 

560 

630 

710 

800 

900 

1 000 

1 120 

1 250 

1 400 

1 600 

1 800 

2 000 

C-19

C-20 

Appendix 

NTN 

1/64 

1/32 

3/64 

1/16 

5/64 

3/32 

7/64 

1/ 8 

9/64 

5/32 

11/64 

3/16 

13/64 

7/32 

15/64 

1/ 4 

17/64 

9/32 

19/64 

5/16 

21/64 

11/32 

23/64 

3/ 8 

25/64 

13/32 

27/64 

7/16 

29/64 

15/32 

31/64 

1/ 2 

33/64 

17/32 

35/64 

9/16 

37/64 

19/32 

39/64 

5/ 8 

41/64 

21/32 

43/64 

11/16 

45/64 

23/32 

47/64 

3/ 4 

49/64 

25/32 

51/64 

13/16 

53/64 

27/32 

55/64 

7/ 8 

57/64 

39/32 

59/64 

15/16 

61/64 

31/32 

63/64 

0.015625 

0.031250 

0.046875 

0.062500 

0.078125 

0.093750 

0.109375 

0.125000 

0.140625 

0.156250 

0.171875 

0.187500 

0.203125 

0.218750 

0.234375 

0.250000 

0.265625 

0.281250 

0.296875 

0.312500 

0.328125 

0.343750 

0.359375 

0.375000 

0.390625 

0.406250 

0.421875 

0.437500 

0.453125 

0.468750 

0.484375 

0.500000 

0.515625 

0.531250 

0.546875 

0.562500 

0.578125 

0.593750 

0.609375 

0.625000 

0.640625 

0.656250 

0.671875 

0.687500 

0.703125 

0.718750 

0.734375 

0.750000 

0.765625 

0.781250 

0.796875 

0.812500 

0.828125 

0.843750 

0.859375 

0.875000 

0.890625 

0.906250 

0.921875 

0.937500 

0.953125 

0.968750 

0.984375 

0.397 

0.794 

1.191 

1.588 

1.984 

2.381 

2.778 

3.175 

3.572 

3.969 

4.366 

4.762 

5.159 

5.556 

5.953 

6.350 

6.747 

7.144 

7.541 

7.938 

8.334 

8.731 

9.128 

9.525 

9.922 

10.319 

10.716 

11.112 

11.509 

11.906 

12.303 

12.700 

13.097 

13.494 

13.891 

14.288 

14.684 

15.081 

15.478 

15.875 

16.272 

16.669 

17.066 

17.462 

17.859 

18.256 

18.653 

19.050 

19.447 

19.844 

20.241 

20.638 

21.034 

21.431 

21.828 

22.225 

22.622 

23.019 

23.416 

23.812 

24.209 

24.606 

25.003 

25.400 

25.797 

26.194 

26.591 

26.988 

27.384 

27.781 

28.178 

28.575 

28.972 

29.369 

29.766 

30.162 

30.559 

30.956 

31.353 

31.750 

32.147 

32.544 

32.941 

33.338 

33.734 

34.131 

34.528 

34.925 

35.322 

35.719 

36.116 

36.512 

36.909 

37.306 

37.703 

38.100 

38.497 

38.894 

39.291 

39.688 

40.084 

40.481 

40.878 

41.275 

41.672 

42.069 

42.466 

42.862 

43.259 

43.656 

44.053 

44.450 

44.847 

45.244 

45.641 

46.038 

46.434 

46.831 

47.228 

47.625 

48.022 

48.419 

48.816 

49.212 

49.609 

50.006 

50.403 

50.800 

51.197 

51.594 

51.991 

52.388 

52.784 

53.181 

53.578 

53.975 

54.372 

54.769 

55.166 

55.562 

55.959 

56.356 

56.753 

57.150 

57.547 

57.944 

58.341 

58.738 

59.134 

59.531 

59.928 

60.325 

60.722 

61.119 

61.516 

61.912 

62.309 

62.706 

63.103 

63.500 

63.897 

64.294 

64.691 

65.088 

65.484 

65.881 

66.278 

66.675 

67.072 

67.469 

67.866 

68.262 

68.659 

69.056 

69.453 

69.850 

70.247 

70.644 

71.041 

71.438 

71.834 

72.231 

72.628 

73.025 

73.422 

73.819 

74.216 

74.612 

75.009 

75406 

75.803 

76.200 

76.597 

76.994 

77.391 

77.788 

78.184 

48.581 

78.978 

79.375 

79.772 

80.169 

80.566 

80.962 

81.359 

81.756 

82.153 

82.550 

82.947 

83.344 

83.741 

84.138 

84.534 

84.931 

85.328 

85.725 

86.122 

86.519 

86.916 

87.312 

87.709 

88.106 

88.503 

88.900 

89.297 

89.694 

90.091 

90.488 

90.884 

91.281 

91.678 

92.075 

92.472 

92.869 

93.266 

93.662 

94.059 

94.456 

94.853 

95.250 

95.647 

96.044 

96.441 

96.838 

97.234 

97.631 

98.028 

98.425 

98.822 

99.219 

99.616 

100.012 

100.409 

100.806 

101.203 

101.600 

101.997 

102.394 

102.791 

103.188 

103.584 

103.981 

104.378 

104.775 

105.172 

105.569 

105.966 

106.362 

106.759 

107.156 

107.553 

107.950 

108.347 

108.744 

109.141 

109.538 

109.934 

110.331 

110.728 

111.125 

111.522 

111.919 

112.316 

112.721 

113.109 

113.506 

113.903 

114.300 

114.697 

115.094 

115.491 

115.888 

116.284 

116.681 

117.078 

117.475 

117.872 

118.269 

118.666 

119.062 

119.459 

119.856 

120.253 

120.650 

121.047 

121.444 

121.841 

122.238 

122.634 

123.031 

123.428 

123.825 

124.222 

124.619 

125.016 

125.412 

125.809 

126.206 

126.603 

127.000 

127.397 

127.794 

128.191 

128.588 

128.984 

129.381 

129.778 

130.175 

130.572 

130.969 

131.366 

131.762 

132.159 

132.556 

132.953 

133.350 

133.747 

134.144 

134.541 

134.938 

135.334 

135.731 

136.128 

136.525 

136.922 

137.319 

137.716 

138.112 

138.509 

138.906 

139.303 

139.700 

140.097 

140.494 

140.891 

141.283 

141.684 

142.081 

142.478 

142.875 

143.272 

143.669 

144.066 

144.462 

144.859 

145.256 

145.653 

146.050 

146.447 

146.844 

147.241 

147.638 

148.034 

148.431 

148.828 

149.225 

149.622 

150.019 

150.416 

150.812 

151.209 

151.606 

152.003 

152.400 

152.797 

153.194 

153.591 

153.988 

154.384 

154.781 

155.178 

155.575 

155.972 

156.369 

156.766 

157.162 

157.559 

157.956 

158.353 

158.750 

159.147 

159.544 

159.941 

160.338 

160.734 

161.131 

161.528 

161.925 

162.322 

162.719 

163.116 

163.512 

163.909 

164.306 

164.703 

165.100 

165.497 

165.894 

166.291 

166.688 

167.084 

167.481 

167.878 

168.275 

168.672 

169.069 

169.466 

169.862 

170.259 

170.656 

171.053 

171.450 

171.847 

172.244 

172.641 

173.038 

173.434 

173.831 

174.228 

174.625 

175.022 

175.419 

175.816 

176.212 

176.609 

177.006 

177.403 

203.200 

203.597 

203.994 

204.391 

204.788 

205.184 

205.581 

205.978 

206.375 

206.772 

207.169 

207.566 

207.962 

208.359 

208.756 

209.153 

209.550 

209.947 

210.344 

210.741 

211.138 

211.534 

211.931 

212.328 

212.725 

213.122 

213.519 

213.916 

214.312 

214.709 

215.106 

215.503 

215.900 

216.297 

216.694 

217.091 

217.488 

217.884 

218.281 

218.678 

219.075 

219.472 

219.869 

220.266 

220.662 

221.056 

221.456 

221.853 

222.250 

222.647 

223.044 

223.441 

223.838 

224.234 

224.631 

225.028 

225.425 

225.822 

226.219 

226.616 

227.012 

227.409 

227.806 

228.203 

177.800 

178.197 

178.594 

178.991 

179.388 

179.784 

180.181 

180.578 

180.975 

181.372 

181.769 

182.166 

182.562 

182.959 

183.356 

183.753 

184.150 

184.547 

184.944 

185.341 

185.738 

186.134 

186.531 

186.928 

187.325 

187.722 

188.119 

188.516 

188.912 

189.309 

189.706 

190.103 

190.500 

190.897 

191.294 

191.691 

192.088 

192.484 

192.881 

193.278 

193.675 

194.072 

194.469 

194.866 

195.262 

195.659 

196.056 

196.453 

196.850 

197.247 

197.644 

198.041 

198.438 

198.834 

199.231 

199.628 

200.025 

200.422 

200.819 

201.216 

201.612 

202.009 

202.406 

202.803 

228.600 

228.997 

229.394 

229.791 

230.188 

230.584 

230.981 

231.378 

231.775 

232.172 

232.569 

232.966 

233.362 

233.759 

234.156 

234.553 

234.950 

235.347 

235.744 

236.141 

236.538 

236.934 

237.331 

237.728 

238.125 

238.522 

238.919 

239.316 

239.712 

240.109 

240.506 

240.903 

241.300 

241.697 

242.094 

242.491 

242.888 

243.284 

243.681 

244.078 

244.475 

244.872 

245.269 

245.666 

246.062 

246.459 

246.856 

247.253 

247.650 

248.047 

248.444 

248.841 

249.238 

249.634 

250.031 

250.428 

250.825 

251.222 

251.619 

252.016 

252.412 

252.809 

253.206 

253.603 

Inch 

Fraction 

Decimals 

0" 1" 2" 3" 4" 5" 6" 7" 8" 9" 

Inch - Millimeter conversion table 

1in.=25.4mm

Needle Roller Bearings - Ntn-snr.com

Create successful ePaper yourself

Delete template?

Save as template?