Best (Formerly Stanley) BB855G-5 x 6 Half Mortise Heavy Weight Concealed Bearing Prison Offset Hinge, 5" x 6", Application G, Furnished  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

The Best BB855G-USP 5" x 6" Concealed Ball Bearing Detention Prison Hinge is a heavy-duty option for offset prison doors, with the capacity to support doors weighing up to 800 lbs. It is designed for use with doors measuring 36" x 84" and requires the installation of three hinges. See the manufacturer's cut sheet for further specifications and consider priming the hinge for paint in a gray finish.

• 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