Single Acting Spring Hinges

Automatically closes doors for use as an alternative to overhead mounted door closers in corridors, entrances, and stairways. Ratchet adjustment eliminates need for adjustment locking pin and allows for quick fine-tuning tension up or down with Allen hexkey. Use with anti-friction hinges for best performance. Pivot point designed to align with CB and FBB series anti-friction ball-bearing hinges. Conforms to ANSI/BHMA Standard A156.17; meets NFPA80 Standard for 3 hour fire rated doors (minimum 2 per doorrequired); UL listed for doors up to 4' x 8'; weighing up to 180 lbs. Double Acting Spring Hinges Permits doors to open in either direction and automatically return to closed position. Provides maximum protection for doors subject to normal abuse, due to resiliency of spring support and shock absorbing reaction of flexible mounting. Adjustable spring tension permits power and speed adjustment of each size spring hinge.