Stanley BB855A-USP 5" x 6" Concealed Ball Bearing Detention Prison Hinge, Application A Double Weight, Up To 800 lbs, USP/600 Primed for Paint
Features For Stanley Hardware BB855A Prison Hinge, Application "A" Double weight Door hinge Up to 800 LBS
For lead-lined doors to x-ray rooms and other exceptionally heavy doors
Made of double-weight steel capable of carrying doors weighing up to 800 lbs. (363 Kg) (Based on a 3' x 7' door with 3 hinges)
Each of the 2 concealed hardened steel races contains sixteen 1/8" (3.2mm) hardened and ground steel balls which are assembled within a jacket
Concealed bearings are well lubricated ensuring smooth, long-lasting operation
Rolled knuckles are welded and machined
Typically made not swaged, no holes (application A) for full surface applications, or for full mortise (applications C) applications. All other configurations are made to order