National Mfg N830-404 4in Satin Nickel Security Hinge

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N830-404 is a full mortise security hinge designed for doors in residential and light commercial applications. Built from heavy gauge cold rolled steel, this 4-inch hinge delivers the structural integrity required for high-traffic or security-conscious installations. The flush pin design gives the finished assembly a clean, professional appearance, while countersunk screw holes and included fasteners streamline the installation process. With a rated safe working load of 55 pounds, this hinge is suited for solid wood and hollow metal doors where dependable, long-term performance is required.

This hinge is appropriate for interior and exterior door applications where a mortise-style fitting is specified. The square corner design fits standard door prep cutouts without modification. The 5-knuckle construction distributes load across the hinge barrel for improved durability under repeated use. It is commonly installed by carpenters, finish contractors, and general tradespeople during door hanging or replacement work. The removable pin simplifies both installation and future door removal. Each package contains 5 hinges, making it suitable for a full 3-hinge door set with a spare.

Key Features

• Heavy gauge cold rolled steel construction for added strength and durability
• Full mortise, square corner design fits standard door prep without modification
• 5-knuckle barrel distributes load and reduces wear on the hinge pin
• Flush pin provides a finished, low-profile appearance on the installed door
• 55-pound safe working load rating suitable for solid residential doors
• Countersunk screw holes with fasteners included for complete installation
• Removable pin for straightforward door installation and removal

Compatibility

Designed as an OEM-style replacement or new-installation full mortise security hinge for standard residential and light commercial door applications requiring a 4-inch square corner mortise hinge.

Installation Notes

Installation is typically performed by a finish carpenter or general contractor using a chisel, mallet, and screwdriver or drill with a driver bit. Ensure the door and frame mortise cutouts are sized correctly for a 4-inch square corner hinge leaf before fastening. Power down any access control or electric strike hardware associated with the door before beginning work. Follow applicable local building codes for door hardware installation in rated assemblies.