3SP1 - 4.5" x 4.5" UL Listed Spring Hinge Finish:Dark Bronze #6 x 5/8" OH SMS

#6 x 5/8" OH SMS

UL Classified for windstorm rated assemblies - R37965

This makes these doors ideal for stairwells in multi-level buildings when occupants must evacuate in case of emergency

and sound rated

Provides electric power transfer from the frame to the door in order to supply power to an electrified mortise or cylindrical lock

3SP1 - 4.5" x 4.5" UL Listed Spring Hinge Finish:Dark Bronze #6 x 5/8" OH SMSIves 3SP1 3 Knuckle Spring Hinge, Standard Weight, 4 1 2" x 4 1 2" Ives offers a variety of architectural hinges that will cover any need commercial application while also exceeding code requirements. With tested durability and consistent superior performance, Ives architectural hinges get the job done. 3 Knuckle Spring Full Mortise Hinge For use with fire doors where self closing is required Maximum door weight 120 lbs, max door width 36" Maximum