National Mfg N241-190 3.5in Black Square Mortise Door Hinge

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N241-190 is a square corner full mortise door hinge designed for standard door installation in residential and light commercial applications. Measuring 3.5 inches by 3.5 inches, this black-finished hinge carries a safe working load of 50 pounds, making it suitable for interior doors of typical weight. Mounting hardware is included — the hinge ships with screws, allowing for a complete installation without sourcing additional fasteners. The full mortise design requires a routed recess in both the door edge and the door frame, producing a flush, clean fit that is standard practice in door hanging work.

This hinge is intended for full mortise door installations where a square corner profile is specified. It is commonly used on interior passage doors, closet doors, and utility doors in residential construction and remodel projects. Carpenters, finish trim contractors, and general contractors are the typical installers. The hinge is sold one per pack and is carded for retail or trade counter display. It is a direct replacement in applications that call for a 3.5 inch by 3.5 inch square corner mortise hinge.

Key Features

• Full mortise design seats flush with door edge and frame for a clean finished appearance
• Square corner profile meets standard door prep specifications
• 50 pound safe working load rating suitable for standard interior doors
• Black finish provides a consistent look with dark hardware sets
• Includes mounting screws for complete installation out of the pack
• Sold individually, one hinge per pack

Compatibility

Designed as an OEM-style replacement for standard 3.5 inch square corner full mortise door hinge applications on residential and light commercial interior doors.

Installation Notes

Installation is performed by carpenters or general contractors using a chisel and router to prepare mortise pockets in the door edge and jamb. Power should be off or isolated if the door frame is part of an electrified or access-controlled assembly before beginning work. Follow applicable local building codes for door hardware requirements in commercial applications. Ensure the mortise depth matches the hinge leaf thickness to achieve a flush fit before driving the included screws.