This model of the Global Door Controls 4.5 in. x 4.5 in. steel spring hinges comes in a US prime finish and functions as a full mortise single acting spring hinges. Recommended for use where automatic self-closing of a door is required. This three knuckled hinges is adjustable and the spring tension can be increased or decreased by using included adjusting tool.
- UL listed for "A" label fire doors
- Steel base material
- Installation: template screw hole locations
- Fasteners: packed with both wood and machine screws
- Conforms to ANSI/BHMA-K81071F for self-closing hinges
- Meets NFPA 80 for 3 hour fire rating
- Corners: square