National Marker N139998 4 in Square Steel Broad Door Hinge

Product Description

The NATIONAL MARKER N139998 is a 4-inch square broad door hinge built for general utility and industrial applications. Constructed from galvanized steel with a brass pin, this hinge is swaged for mortise installations, providing a clean, flush fit in pre-routed door and frame applications. The loose removable pin design allows doors to be lifted free of their frame without removing the hinge leaves from either surface. This part is a catalog series V504 through V504BC component, sold individually and suited for both light commercial and industrial service contexts.

This hinge is intended for interior and exterior door installations where a mortise-style broad hinge is specified. The swaged leaf profile is compatible with standard mortise routing on wood or metal door frames. The loose pin configuration is commonly specified in industrial facilities, utility rooms, and commercial spaces where frequent door removal is required for maintenance access or equipment movement. A licensed carpenter, millwright, or general contractor typically handles installation.

Key Features

• Loose removable brass pin allows door removal without uninstalling hinge leaves
• Swaged design engineered specifically for mortise installations
• Galvanized steel construction for corrosion resistance in utility and industrial environments
• 4-inch square leaf profile suits standard broad hinge mortise routing
• Part of the National catalog V504 through V504BC series for verified part matching

Compatibility

Designed as an OEM-style replacement broad door hinge for general utility and industrial mortise door applications. Compatible with standard 4-inch square mortise hinge cutouts on wood or metal doors and frames.

Installation Notes

Installation is typically performed by a carpenter, millwright, or general contractor using standard hand tools. Mortise routing should match the 4-inch square leaf dimensions before setting the hinge. Remove all door weight and secure the door before driving hinge screws to ensure proper alignment. Verify that the brass pin seats fully and the swaged leaves sit flush within the mortise before closing the door.

Technical Specifications

• Hinge Size: 4 inches square
• Material: Galvanized steel with brass pin
• Pin Type: Loose removable pin
• Installation Type: Mortise (swaged leaves)
• Catalog Series: V504 through V504BC
• Weight: 0.645 pounds
• Unit of Measure: Each

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N139998