The Global Door Controls model is a plain bearing full mortise single-acting spring hinge, ideal for commercial and residential doors requiring automatic self-closing. It features an adjustable knuckle hinge with modifiable spring tension using the included tool. For best performance, using three spring hinges per opening is recommended, though full tension on all may not be necessary. This 4.5 x 4.5-inch hinge comes with squared corners and a fixed pin.
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