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