For a high quality, long lasting connection, two things need to happen:
1) WIRE STRAND MOVEMENT - If the strands are forced to slide sideways across the rod and each other, the oxide is sheared off, exposing fresh, shiny metal for an excellent connection. Most clamps are vee-shaped where they contact the wire, which helps keep the wire round and reduces sliding - not good. This clamp has a rounded profile that causes the the strands to slide past the rod and each other as it flattens out to form an excellent connection.
2) DEFORMATION - The strands have to be squished and deformed against the rod and each other to form an air tight seal that won't oxidize for corrode. DEFORMATION MEANS LOTS OF FORCE, as much as you can apply without breaking the clamp will make the copper deform to a wider, airtight contact area. This type of clamp usually breaks through the thin section around the bolt hole. On this Morris clamp, instead of a cylinder around the bolt, the whole top is solid, so the area around the bolt is reinforced, and more torque can be applied. The more the better. Hydraulic lug crimpers will actually forge the strands into a solid wire.
3) Great safety feature, with a short bolt, the clamp won't break when the bolt is tightened all the way and shouldered. It's not necessary to get it this tight, but if you tighten it until it hits, and the connection is well and truly solid and will last forever. This also automatically applies more load to big wire.
The sides and top are machined to remove pits that could start a crack, and an attractive finish.
Theoretically, my cordless impact driver rated at 900 in-lbf can apply 75ft- lbf - far more than the at least 30 ft-lbf required, but in practice with a hex socket adapter and movement of the rod, less than 10 ft-lbf was actually applied, not even close to squishing the wire and forming a good connection. You need at least a 1500 in-lbf rating to get the job done, maybe more. After being drenched in alcohol and penetrating oil, my flooded and rusted up, 40 year old, 3/8" Chicago Pneumatic air impact wrench will break a clamp at 4, no problem, so I turned it down to 3 and well and truly made up the clamps forever. However, these clamps have a neat feature, with a short bolt they won't break
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Reviewed in the United States on August 20, 2019
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on June 30, 2023
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on August 1, 2019
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on July 13, 2017
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on May 6, 2015
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on February 9, 2021
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on May 23, 2023
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
Reviewed in the United States on September 4, 2022
Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
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Reviewed in Canada on May 23, 2023Size: 1/0-10 Wire Range, 5/8” Diameter (Pack of 1)Verified Purchase
