National Mfg N273-912 Weldable Surface Door Hinge 3.5in Steel

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N273-912 is a plain steel, tight non-removable surface pin door hinge designed for weld-on metal applications. The tight pin design resists removal and improves security compared to standard loose-pin hinges. The non-swaged leaf profile keeps the hinge flat against the surface for a flush weld fit. Rated to a safe working load of 70 pounds, this hinge is built for metal door and gate fabrication work where a bolted or mortised hinge is not practical. It ships 1 piece per pack in bulk box format, making it straightforward to source in the quantities a job requires.

This hinge is intended for surface-mount applications on metal doors, frames, gates, enclosures, and fabricated assemblies where welding is the preferred or required attachment method. It is suited for both light industrial and commercial metalwork scenarios. Welders, fabricators, and ironworkers typically install this type of hinge during new construction or replacement work on steel door systems and enclosure panels. It is not designed for wood or through-bolt installation.

Key Features

• Tight non-removable pin for enhanced security in surface-mount door applications
• Non-swaged hinge leaves provide a flat surface for clean, consistent weld attachment
• Plain steel construction is weldable without coating interference
• Safe working load rated at 70 pounds per hinge
• 3.5-inch hinge size suitable for standard metal doors and enclosure panels
• Supplied 1 piece per pack in bulk box format

Compatibility

Designed as a weld-on surface hinge for metal door, gate, and enclosure fabrication applications where a tight non-removable pin is required.

Installation Notes

Installation is performed by welders or metal fabricators using standard MIG or stick welding equipment. Ensure the door or panel assembly is properly supported and aligned before tacking the hinge in place. Follow applicable welding safety procedures and local codes throughout the process. Do not attempt to install this hinge using screws or bolts, as it is designed exclusively for weld-on surface application.