McKinney 1552 4.5 x 4.5 Stainless Steel Spring Hinge

McKinney 1552 4-1/2" x 4-1/2" Spring Hinge, Full Mortise, Stainless Steel US32D

Recommended for standard weight, medium frequency doors in place of door closers in apartments, hotels, motels, office buildings, etc. Spring hinges are an alternative to door closing devices. Generally two hinges on the door must be spring hinges to provide adequate closing force. NFPA requires a minimum of two (2) spring hinges on labeled doors. This non-handed spring hinge series is adjustable and tension can be added or reduced by means of a hex key that is provided. Locking screw provides tamper-resistance after the proper tension has been set. Hinges are .134 thick and are furnished with All Wood Screws (1-1/4 x 12) and All Machine Screws (1/2" x 12-24)
Caution: Use of gasketing for smoke or sound protection, wind conditions or unbalanced air pressure, twisted or misaligned frames or doors, door bottoms, improper latch adjustment may prevent doors from latching. Additional spring hinges may be required.

For door weights up to 115 pounds, use two 1552 4-1/2" height spring hinges and one equivalent size bearing hinge.
For door weights up to 150 pounds, use three 1552 4-1/2" height spring hinges.

Hinges are sold as Each

ANSI Number:  K51071