National Mfg N830-431 Full Mortise Door Hinge 3.5 in Black

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N830-431 is a full mortise door hinge built from heavy-gauge cold-rolled steel for lasting durability in residential and light commercial door applications. Finished in black with a flush pin for a clean, professional look, this hinge measures 3.5 inches and features a 1/4-inch round radius corner profile. The five-knuckle design provides solid load distribution across the hinge barrel. Countersunk screw holes and a removable pin simplify installation and make door removal straightforward when needed. Fasteners are included. This hinge is suited for interior and exterior door installations where a mortise-style fitting is required.

This hinge is used in standard door frame and door slab installations requiring a mortised recess. The full mortise design seats flush within the door and frame, making it appropriate for finish carpentry, replacement hardware projects, and new construction. The black finish suits doors where a dark hardware finish is specified. Sold in packages of 15 units, this hinge is practical for contractors, finish carpenters, and maintenance professionals working on multiple doors in a single job.

Key Features

• Heavy-gauge cold-rolled steel construction for added strength and resistance to deformation
• Five-knuckle, full mortise design for flush, professional installation
• 1/4-inch round radius corners to match standard mortise profiles
• Flush pin provides a finished, unobtrusive appearance
• Removable pin allows easy door hanging and removal without tools
• Countersunk screw holes with fasteners included for complete installation

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard full mortise door applications requiring a 3.5-inch hinge leaf with a 1/4-inch round radius corner profile.

Installation Notes

Installation is typically performed by carpenters, general contractors, or maintenance technicians familiar with door hardware. Mortise the hinge recess to the correct depth before seating the hinge to ensure a flush fit. Remove the pin before separating door and frame leaves for easier handling. Follow applicable local building codes for door hardware when used on egress or fire-rated door assemblies.