McKinney 1502 4X4 3 Steel Standard Weight Full Mortise Spring Hinge, Bright Polished Brass

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. For unparalleled tamper resistance and security choose the TRS option. 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.