National Mfg N139-998 4 Inch Steel Removable Pin Broad Hinge 5 Pack

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N139-998 is a plain steel removable pin broad hinge designed for full mortise door installations. Manufactured from cold rolled steel, this five-knuckle hinge measures 4 inches and features a swaged construction for precise mortise fitment. The loose pin design allows doors to be removed without taking the hinge off the frame, a practical advantage during installation, adjustment, or service work. Each package contains five hinges, sold boxed loose. This product is suited for contractors, finish carpenters, and facilities maintenance professionals working on commercial or residential door hardware applications.

This hinge is intended for full mortise installations where the hinge leaf is recessed into both the door edge and the door frame. The full mortise design provides a clean, flush appearance and a stable pivot point. The swaged knuckle construction aligns the leaves for consistent door swing and gap control. With a removable loose pin, doors can be lifted clear of the frame without disturbing the hinge leaves, which reduces labor time during door swapping or replacement work. Typical applications include interior passage doors, closet doors, and light commercial door assemblies.

Key Features

• 4-inch hinge size suited for standard interior and light commercial door applications
• Loose removable pin allows door removal without uninstalling the hinge leaves
• Cold rolled steel construction for consistent dimensional tolerances
• Five-knuckle design provides stable pivot support across the hinge height
• Swaged leaves designed specifically for full mortise installations
• Packaged five hinges per box for multi-door projects

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard full mortise door applications requiring a 4-inch plain steel removable pin broad hinge.

Installation Notes

Installation is performed by carpenters, door hardware installers, or general contractors following standard mortise hinge procedures. Mortise the door edge and frame jamb to the correct leaf dimensions before seating the hinge. Ensure the door is properly supported before removing the loose pin to avoid damage to the door or frame. Follow applicable local building codes for door hardware specifications on fire-rated or egress door assemblies.