The Global Door Controls 3.5 in. x 3.5 in. bright brass residential steel hinges functions as a full mortise single acting spring hinge. Recommended for use where automatic self-closing of a door is required. The 3 knuckled hinges is adjustable and the spring tension can be increased or decreased by using included adjusting tool. For maximum versatility use 3 hinges on required opening. Full spring tension may not be required on all hinges but allows for greater adjustment.
- UL R19063 listed for "A" label fire doors
- Steel based material
- Template crew hole locations
- Packed with wood screws