National Marker N140681 4 in Square Steel Broad Door Hinge

Product Description

The NATIONAL MARKER N140681 is a 4-inch square broad butt door hinge designed for average-weight door applications. Part of the National catalog 505 series, it features a tight pin construction and a plain steel finish. This hinge is used to mount standard interior or exterior doors to their frames and is typically installed by carpenters, general contractors, or maintenance technicians. The steel construction provides solid support for everyday door swing cycles, and the broad butt profile distributes load across a wider mortise area compared to standard narrow-butt hinges.

This hinge is suited for residential and light commercial door installations where average door weight is a factor. The 4-inch square format fits standard pre-mortised door frames and is a common replacement or new-installation hinge in construction and maintenance applications. It is sold individually and is compatible with typical door frame routing for 4-inch butt hinges.

Key Features

• 4-inch square broad butt profile for wider load distribution on average-weight doors
• Tight pin design keeps the pin fixed and non-removable from the exterior side
• Plain steel finish suitable for painting or use in non-corrosive interior environments
• Part of the National 505 series catalog line
• Compact and lightweight at 0.639 pounds per unit

Compatibility

Designed as an OEM-style replacement or standard installation hinge for average-weight residential and light commercial doors requiring a 4-inch square broad butt fitting.

Installation Notes

Installation is typically performed by a carpenter, contractor, or skilled maintenance technician using a chisel and screwdriver or drill. Power to any electric strike or access-control hardware associated with the door should be disconnected before service. Ensure the door frame mortise is routed to the correct depth to allow the hinge leaf to sit flush. Follow applicable local building codes for door hardware requirements.

Technical Specifications

• Hinge Size: 4 inches square
• Pin Type: Tight pin
• Finish: Plain steel
• Series: National 505
• Weight: 0.639 pounds
• UPC: 00038613140684

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N140681