Best BB852A-5 x 6-USP Full Surface Triple Weight Concealed Bearing Prison Hinge, With No Holes, Not Swaged, Prime Coat Gray

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• For lead-lined doors to x-ray rooms and extremely heavy doors and gates
• For hinged cell-front doors and grated steel doors of penitentiaries, jails, reformatories, etc.
• Made of triple weight steel capable of carrying doors weighing up to 1200 lbs. (544 Kg)
• (Based on a 3' x 7' door with 3 hinges)
• concealed hardened steel races contains sixteen 3/16" (4.8 mm) hardened and ground steel balls which are assembled within a jacket
• Provision has been made in the barrel of the hinge for forced lubrication if further lubrication is necessary 
• Typically made not swaged, no holes (application A) for full surface applications, or for full mortise (applications C) application. All other configurations are made to order