The Hager BB1279 is a full mortise ball bearing hinge for swinging commercial doors. It mounts in a mortised leaf cut on the door and frame. The ball bearing knuckle supports smooth door swing in regular use. Part BB1279 4-1/2X4-1/2 US26D SH is the Standard Weight, 4-1/2 x 4-1/2 in, Steel, 5 Knuckle, Security Stud version in Satin Chrome.

• Standard Weight
• 4-1/2 x 4-1/2 in
• Steel
• 5 Knuckle
• Security Stud
• Finish US26D Satin Chrome
• Fire rated: 3 Hours {A}
• Part number BB1279 4-1/2X4-1/2 US26D SH