Best (Formerly Stanley) BB855D-5 x 6-USP Full Mortise Heavy Weight Concealed Bearing Prison Hinge 5" x 6", Swaged, Furnished With Fasteners, Door Weighing Up To 800 Lbs, See Manuf Cut Sheet, USP Prime Coat Gray

The BB855D-USP is a Full Mortise Heavy Weight Concealed Bearing Prison Hinge, designed specifically for doors weighing up to 800 lbs. This 5" x 6" hinge is furnished with pre-drilled holes and swaged for easy installation. It also comes with a prime coat in gray, as detailed on the manufacturer's cut sheet.

• 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