Product Description
National 522 Round Corner Spring Hinge allows for adjustable closing speed and tension. It is made of cold-rolled steel and has 1/4 in. radius round corners. It fits a standard hinge cutout. UL approved for fire doors.
Product Specifications
| Certifications | UL Approved For Fire Doors |
|---|---|
| Feature Products | – |
| Product Color | Brass |
| Product Material | Steel |
| Spec Package Size | 1 pk. |
| Size | Available in 3-1/2 and 4 in. |





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