National Mfg N100-051 3in Double Acting Spring Hinge

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N100-051 is a double acting spring hinge designed for swinging doors that require two-way access. The self-closing mechanism uses an adjustable tight pin, allowing the installer to dial in the desired closing speed without specialized tools. At 3 inches, this hinge uses a surface mount installation method, meaning no mortising is required. The satin nickel finish suits interior residential and light commercial door applications. Sold in a pack of 5, this hinge is a practical stock item for contractors and facility maintenance crews who service high-traffic swinging door installations.

This hinge is appropriate for interior swinging doors in residential and light commercial settings where a door must swing freely in both directions and return to a closed position automatically. Common applications include kitchen pass-through doors, restaurant service doors, and utility room entries. The surface mount design speeds up installation and works on doors where cutting a mortise is not practical or desired. The adjustable closing speed makes it adaptable to doors of varying weight within the hinge's rated range.

Key Features

• Double acting spring mechanism allows door to swing in both directions
• Self-closing action returns door to closed position automatically
• Adjustable tight pin lets the installer set closing speed to match door weight and traffic conditions
• Surface mount installation requires no mortising
• Satin nickel finish for a clean, low-glare appearance
• Sold in a pack of 5 for efficient stocking on multi-door jobs

Compatibility

Designed as a surface mount replacement or new-install double acting spring hinge for standard interior swinging doors. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation is performed by a finish carpenter, general contractor, or experienced handyman using standard hand tools. Power down any associated door hardware or access control systems before working on the door assembly. Because no mortising is required, align the hinge leaves flush to the door edge and jamb face before fastening. Adjust the tight pin incrementally after mounting to achieve the desired closing speed before finalizing the installation.