National Marker N273920 Weldable Door Hinge 4 in Steel

Product Description

The NATIONAL MARKER N273920 is a heavy-duty weldable door hinge designed for surface-mount installation on metal applications. This nonswaged hinge features a nonremovable, tight-fit pin for added security in demanding environments. Constructed from cold-rolled steel with a plain steel finish, it is built for durability in industrial and commercial door assemblies. The 4-inch square footprint provides a wide bearing surface suited to heavier doors and frequent-use applications. Installation is performed by welding directly to the metal surface, making it a reliable choice for fabricators, millwrights, and ironworkers requiring a permanent, non-lifting-off hinge solution.

This hinge is used in industrial and commercial settings where surface-welded door hardware is required. It is well suited for metal doors, access panels, equipment enclosures, and similar fabricated assemblies where a conventional mortised or screw-mounted hinge is not appropriate. The nonremovable pin design prevents the door from being lifted off the hinge from the outside, making it appropriate for secure enclosures and utility applications. Catalog model number 560.

Key Features

• Nonswaged design allows direct surface application by welding to metal
• Nonremovable, tight-fit pin for more secure, tamper-resistant applications
• Cold-rolled steel construction with plain steel finish for strength and weldability
• 4-inch square hinge leaf provides broad load-bearing surface for heavier doors
• Heavy-duty build suited for industrial enclosures, equipment panels, and metal doors

Compatibility

Designed as an OEM-style weldable replacement or new-installation hinge for metal doors, access panels, and fabricated enclosures requiring a surface-welded, nonremovable-pin hinge.

Installation Notes

Installation is performed by a qualified welder or fabricator using appropriate MIG or stick welding equipment rated for cold-rolled steel. Ensure the door and frame are properly aligned and clamped before tacking the hinge in place. Follow applicable structural and safety codes for welded metal assemblies in your jurisdiction. Allow all welds to cool fully before testing door operation or applying load to the hinge.

Technical Specifications

• Hinge Size: 4 inches square
• Material: Cold-rolled steel
• Pin Type: Nonremovable
• Hinge Style: Nonswaged
• Finish: Plain steel
• Mounting Method: Surface weld
• Weight: 0.839 pounds

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N273920