National Mfg N273-920 Weldable Door Hinge 4x4 Plain Steel

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N273-920 is a 4-inch by 4-inch plain steel weldable door hinge designed for surface application on metal doors and frames. It features a non-removable, tight-fit pin that resists unauthorized disassembly, making it appropriate for higher-security installations. The non-swaged, heavy-duty construction is intended for weld-on mounting rather than screw attachment, eliminating the need for pre-drilled holes. Installers working with fabricated metal doors, security enclosures, or industrial steel frames will find this hinge well-suited to those applications. Each pack contains one hinge, boxed loose.

This hinge is commonly used in commercial and industrial settings where metal-to-metal welded connections are required. Typical installations include steel door frames, equipment enclosures, security doors, and fabricated metal panels. The plain steel finish is suitable for environments where the hinge will be painted or coated after installation. It is not intended for wood-door applications or standard screw-mount installations. Welding professionals and metal fabricators are the primary trade installers for this type of hardware.

Key Features

• 4-inch by 4-inch hinge leaf size for heavy-duty door applications
• Non-removable pin for improved security and tamper resistance
• Non-swaged construction designed exclusively for weld-on surface mounting
• Plain steel material accepts paint or coating after installation
• Sold individually, one hinge per pack, boxed loose

Compatibility

Designed as a weld-on replacement or new-installation hinge for metal doors and frames requiring a 4-inch by 4-inch non-swaged hinge with a non-removable pin.

Installation Notes

Installation requires MIG or stick welding equipment and should be performed by a qualified metal fabricator or welder. Ensure all surrounding materials are protected from weld spatter and that proper personal protective equipment is used during welding. Verify door alignment and hinge placement before final welds are made, as repositioning after welding is not practical. Follow all applicable local codes and manufacturer guidelines for door hardware load ratings.