National Mfg N185-207 4x4 Brass Adjustable Spring Hinge

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N185-207 is a 4-inch by 4-inch brass adjustable spring hinge designed to keep doors closed automatically without a separate closer mechanism. It features a 1/4-inch round corner profile and fits standard hinge cutouts, making it a direct drop-in replacement during new installs or service calls. The closing speed is field-adjustable, giving installers control over how quickly the door returns to the closed position. This hinge is suited for residential and light commercial settings where self-closing doors are required by code or preferred for convenience and safety.

Typical applications include basement entry doors, stairway access doors, garage entrance doors, and apartment building corridor doors. The hinge is appropriate for both new construction and retrofit installations. Its standard sizing means it works with common door preparations without requiring additional mortising or hardware modification. Each pack contains one hinge, sold in packages of two, making it straightforward to order the correct quantity for a single door.

Key Features

• 4 inches x 4 inches footprint fits standard hinge cutouts with no additional prep
• Adjustable closing speed lets installers fine-tune door return rate on-site
• 1/4-inch round corner profile for a clean, finished appearance
• Brass finish suitable for residential and commercial apartment applications
• Self-closing design supports code-compliance requirements for stairway and garage entry doors
• Package quantity of 2 per pack simplifies ordering for single-door jobs

Compatibility

Designed as an OEM-style replacement or new-install spring hinge for standard residential and commercial doors including basement, stairway, and garage entrance applications that require self-closing hardware.

Installation Notes

Installation is typically performed by a finish carpenter, door hardware specialist, or general contractor. Before installation, confirm the door edge is prepped with a standard hinge mortise matching the 4-inch by 4-inch leaf size. Adjust closing speed using the built-in tension adjustment mechanism per the manufacturer instructions included in the pack. Check applicable building codes, such as the IBC or local residential codes, for self-closing door requirements in stairway and garage separation walls.