National Mfg N225-979 Ss Full Mortise Hinge 5/8x4 in 3-pack

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N225-979 is a stainless steel full mortise door hinge sold in a 3-pack. Built from heavy-gauge stainless steel, it delivers maximum corrosion resistance in demanding environments including exterior doors, coastal installations, and high-humidity commercial settings. The hinge measures 5/8 inches by 4 inches with a 5/8-inch radius on the round corners. A five-knuckle design provides smooth, stable door movement, while the non-rising pin keeps the barrel flush during operation. Countersunk screw holes allow fasteners to sit flush for a clean, finished surface. The nib on the hinge body adds a traditional finished appearance consistent with architectural hardware standards.

This hinge is suited for residential and light commercial door installations where corrosion resistance is a priority. Common applications include exterior entry doors, utility room doors, marine-adjacent structures, and any interior door in high-moisture environments such as bathrooms or laundry rooms. The full mortise design requires a routed mortise in both the door edge and the door frame jamb. Each package contains three hinges, providing a complete set for a standard single door installation. Installers working on exterior applications will benefit from the stainless steel construction, which resists rust and surface oxidation over extended service life.

Key Features

• Stainless steel construction for maximum corrosion resistance in exterior and high-humidity applications
• Heavy-gauge material provides added strength and durability under repeated load cycles
• Five-knuckle, full mortise design for stable door swing and professional-grade fitment
• Non-rising pin keeps barrel flush and prevents interference during door operation
• Countersunk screw holes allow fasteners to sit flush for a finished appearance
• 5/8-inch radius round corners and decorative nib for a traditional architectural look

Compatibility

Designed as an OEM-style full mortise hinge replacement for standard residential and light commercial door applications requiring a 4-inch stainless steel hinge with a full mortise cut.

Installation Notes

Full mortise hinges are installed by licensed carpenters, general contractors, or experienced door hardware technicians. A properly sized mortise must be routed into both the door edge and the jamb before installation. Remove the door from the opening and ensure all power is disconnected from any associated electronic hardware before beginning work. Follow local building codes for exterior door hardware specifications, particularly in corrosive or coastal environments.