Spring-hinge 50 Lb Weight Capacity Steel Bright Brass 4-1/2"

Ideal for use in corridors, entrances and stairways. Automatically closes door an alternative to overhead mounted door closers. Patented ratchet adjustment eliminates need for adjustment locking pin. Meets NFPA8 standard for 3 hrs fire-rated doors minimum two spring hinges per door required. UL listed for doors up to 4 x 8 ft weighing up to 180 lb. Conforms to ANSI/BHMA standard A156.17, Grade 1.