National Hardware Spring Door Hinge, Adjustable, Bronze, 4 In.

The National Hardware N350-850 is a spring door hinge with adjustable closing speed and tension. Spring hinges automatically pull the door closed while allowing you to fine-tune performance based on whether the door is heavy or light. This 4-inch hinge is suitable for hinge cutouts and fire doors up to 3 feet by 7 feet.

The hinge is constructed from cold-rolled steel and finished in oil-rubbed bronze. The rounded 1/4-inch corners give the hinge a refined appearance. Eight mounting holes allow secure installation in standard hinge cutouts. The spring-adjustable feature ensures consistent performance over time.

Features and Benefits

• Adjustable Closing Speed and Tension: Fine-tune the hinge performance for optimal results on heavy or light doors.
• Fire Door Approved: UL approved for fire doors, meeting safety standards for appropriate applications.
• Cold-Rolled Steel Construction: Durable steel body with oil-rubbed bronze finish.
• Rounded Corner Design: 1/4-inch radius round corners for a refined appearance.
• Eight Mounting Holes: Compatible with standard hinge cutouts for straightforward installation.
• Spring-Adjustable Feature: Maintains consistent performance over time as door use continues.

Specifications

• Brand: National Hardware
• Model: N350-850
• Length: 4 inches
• Material: Cold-rolled steel
• Finish: Oil-rubbed bronze
• Weight: 37 pounds
• Mounting Holes: 8
• Corner Style: 1/4-inch radius round corners
• Suitable For: Hinge cutouts and fire doors up to 3 feet by 7 feet
• Certifications: UL approved for fire doors