National Marker N830250 Square Corner Door Hinge

Product Description

The NATIONAL MARKER N830250 is a 3-inch square corner door hinge finished in satin nickel, designed for full mortise installation in residential and light commercial door applications. Built from heavy-gauge cold-rolled steel, it delivers the structural rigidity required for repeated daily use. The 5-knuckle design distributes door weight evenly across the barrel, reducing wear over time. A flush pin gives the installed hinge a clean, finished look, while countersunk screw holes allow fastener heads to sit flush with the hinge leaf. This hinge is typically installed by carpenters, general contractors, or experienced DIYers during door hanging or replacement projects.

This hinge fits standard interior and exterior door applications where a 3-inch square corner full mortise hinge is specified. The removable pin simplifies door installation and removal, making it practical for situations where doors need to be taken down for finishing, painting, or seasonal adjustment. The satin nickel finish suits a range of door hardware finishes common in residential construction and renovation.

Key Features

• Heavy-gauge cold-rolled steel construction for added load-bearing strength
• 5-knuckle full mortise design for even weight distribution and smooth pivot action
• Removable pin for easier door installation and removal
• Flush pin design for a clean, finished appearance when installed
• Countersunk screw holes allow fasteners to sit flush with the hinge leaf
• Square corners for precise mortise fitment in standard door frames

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard 3-inch square corner full mortise door applications in residential and light commercial construction.

Installation Notes

Installation is typically performed by a carpenter or general contractor using a chisel and router to cut the mortise recess in the door and frame. Power should be disconnected from any adjacent electric strike or access control hardware before beginning work. Ensure the mortise depth matches the hinge leaf thickness for a flush fit. Follow local building codes for door hardware specifications on fire-rated or egress door assemblies.

Technical Specifications

• Hinge Size: 3 inches
• Corner Style: Square
• Design: 5-knuckle full mortise
• Material: Heavy-gauge cold-rolled steel
• Finish: Satin nickel
• Pin Type: Removable flush pin
• Screw Holes: Countersunk
• Weight: 0.306 pounds
• UPC: 00886780009903

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N830250