Best (Formerly Stanley) BB855A-5 x 6-USP Full Surface Heavy Weight Concealed Bearing Prison Hinge 5" x 6" With No Holes, 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 BB855A-USP is a 5" x 6" Concealed Ball Bearing Detention Prison Hinge that is designed for Application A Double Weight, with a maximum weight capacity of 800 lbs. It is primed for paint and meets USP/600 standards for quality and durability.
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
