National Hardware N140-681 Steel Square Corner Hinge 4x4 in

Product Description

The NATIONAL HARDWARE N140-681 is a square corner residential door hinge constructed from steel with a zinc plated finish. Measuring 4 inches wide by 4 inches high, it is built for standard residential door applications where a clean, 90-degree corner profile is required. The hinge features a 5-knuckle design and carries a load capacity of 70 pounds, making it appropriate for interior and exterior residential doors of typical weight. Licensed contractors, carpenters, and general construction trades install this type of hardware during new construction, renovation, or replacement work.

This hinge is suited for residential door installations where square corner mortise hinges are specified. Common applications include interior passage doors, bedroom doors, closet doors, and light exterior doors in single-family and multi-family residential settings. The zinc plated finish provides a baseline level of corrosion resistance for interior use. It is sold individually but carries a minimum order quantity of 5 units, making it practical for contractors stocking hardware for multiple doors on a job site.

Key Features

• 4 inches wide by 4 inches high square corner hinge profile
• Steel construction for durability in residential door applications
• Zinc plated finish for corrosion resistance
• 5-knuckle design for smooth pivot action
• 70-pound load capacity suitable for standard residential doors

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard residential doors requiring a 4-inch square corner mortise hinge.

Installation Notes

Installation is typically performed by carpenters, finish contractors, or general trades using a chisel and drill for mortise preparation. Power down any electronic door hardware or access control systems before beginning work. Ensure the mortise depth matches the hinge leaf thickness to achieve a flush fit. Follow applicable local building codes for door hardware specifications on fire-rated or egress doors.