National Mfg N273-946 Plain Steel Door Hinge 5 Inches

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N273-946 is a plain steel door hinge designed for surface application by welding. Built from cold rolled steel, this five-knuckle, full mortise hinge measures 5 inches and features a tight pin construction for added security in demanding applications. It is non-swaged, making it suitable for weld-on installs where a fastener-free mounting method is required. Sold as a box of five loose hinges, it is a practical choice for fabricators, contractors, and tradespeople who need a reliable steel hinge for heavy-use doors.

This hinge is intended for commercial and industrial door applications where surface welding is the preferred or required mounting method. The full mortise design suits installations where the hinge leaf must sit flush within a mortised recess on the door and frame. Its cold rolled steel construction handles the structural demands of metal doors, frames, and access panels commonly found in mechanical rooms, utility enclosures, and industrial facilities.

Key Features

• 5-inch hinge size suited for heavy-duty door applications
• Weldable, non-swaged design for secure surface-mount welding
• Cold rolled steel construction for strength and durability
• Five-knuckle configuration for smooth, stable door operation
• Full mortise design for flush, recessed installation
• Tight pin for more secure, rattle-resistant performance

Compatibility

Designed as a weldable, full mortise replacement hinge for commercial and industrial metal door and frame applications requiring a 5-inch non-swaged steel hinge.

Installation Notes

Installation is performed by welding the hinge leaves directly to the door and frame surfaces, requiring appropriate welding equipment and operator certification. Power down or de-energize any electrically operated door hardware before beginning work. Follow applicable local building and fire codes governing door hardware installation in commercial and industrial settings. Ensure weld surfaces are clean and free of coatings before welding to achieve a proper bond.