Bommer
3-1/2 x 3-1/2 x 5/8 Radius Spring Hinge, Pair, Bommer LB4312-350
The Bommer LB4312-350 is a pair of Single Acting Spring Hinges, designed for fire door applications and UL Listed for performance.
Constructed from durable steel with a .096 gauge, these hinges feature a tension adjusting tool and locking pins allowing precise control over the door's closing force.
The set includes installation hardware: #10 x 3/4" wood screws and #10-24 x 1/2" machine screws. Dimensions and diagrams are available on the manufacturer's spec sheet.

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