Best (Formerly Stanley) BB855F-5 x 6-USP Half Mortised Heavy Weigh Concealed Bearing Prison Hinge, Not Offset, 5" x 6" Furnished With Fasteners, Door Weighing Up To 800 Lbs, Based On a 36" x 84" Door, Using [3] Hinges, See Manuf Cut Sheet, USP Prime Coat Gray
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The Best BB855F-USP 5" x 6" Concealed Ball Bearing Detention Prison Hinge is designed for use with doors weighing up to 800 lbs and measuring 36" x 84", using [3] hinges. This half mortised, heavy weight hinge is furnished with holes and comes in a prime coat gray finish. Refer to the manufacturer's cut sheet for more details.
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)
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