National Marker N830403 Square Door Hinge 4 in Satin Brass 3-pack

Product Description

The NATIONAL MARKER N830403 is a 4-inch square corner door hinge finished in satin brass, sold in a 3-pack. Built from heavy-gauge cold-rolled steel, this full mortise hinge delivers structural strength suited to residential and light commercial door installations. The 5-knuckle design provides smooth, stable operation across the full arc of door swing. Countersunk screw holes allow fasteners to sit flush with the hinge leaf, and a removable pin simplifies door hanging and removal without disturbing the frame-side leaf. Licensed trade carpenters, finish contractors, and maintenance technicians are the primary installers.

This hinge is designed for standard interior and exterior door applications requiring a 4-inch square corner, full mortise hinge. The satin brass finish suits residential entry doors, interior passage doors, and light commercial doors where a clean, finished appearance is required. The 3-pack format is practical for single-door installations, which typically require 3 hinges per door leaf.

Key Features

• Heavy-gauge cold-rolled steel construction for added load strength
• Full mortise, 5-knuckle design for smooth and stable door swing
• Square corners for compatibility with standard mortise router templates
• Countersunk screw holes allow flush fastener seating
• Removable pin simplifies door installation and removal
• Satin brass finish provides a clean appearance on finished doors

Compatibility

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

Installation Notes

Installation is performed by finish carpenters or licensed contractors using a router or chisel to cut the mortise pocket in both the door edge and the door frame. Ensure the door is fully supported and blocked during hinge installation to prevent movement. Countersink pilot holes before driving screws to avoid splitting the door stile or frame. The removable pin allows the door to be lifted free of the frame without removing the hinge leaves from either surface.

Technical Specifications

• Hinge Size: 4 inches
• Corner Style: Square
• Knuckle Count: 5
• Hinge Type: Full Mortise
• Material: Heavy-gauge cold-rolled steel
• Finish: Satin Brass
• Pin Type: Removable
• Package Quantity: 3-pack
• Package Weight: 1.714 pounds

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N830403