National Marker N225920 Stainless Steel Door Hinge

Product Description

The NATIONAL MARKER N225920 is a 3.5-inch square stainless steel door hinge built for applications where corrosion resistance and long-term durability are required. Constructed from heavy-gauge stainless steel, this hinge features a 5-knuckle, full mortise design with square corners and countersunk screw holes for a clean, finished installation. The non-rising pin stays flush during operation, and the removable pin simplifies installation and removal. A nob detail on the hinge body provides a finished appearance suitable for visible door hardware applications. This hinge is installed by carpenters, general contractors, and maintenance professionals working on interior or exterior door assemblies.

This hinge is suited for residential and light commercial door installations where stainless steel is specified to resist moisture, humidity, or corrosive environments. Typical applications include exterior entry doors, marine or coastal environments, commercial restroom partitions, and any setting where standard steel hinges would be prone to rust or surface degradation. The full mortise design requires a routed mortise pocket in both the door edge and the frame, making it appropriate for new construction and full door replacement projects where proper preparation of the door and frame is completed before installation.

Key Features

• Stainless steel construction for maximum corrosion resistance in humid or exterior environments
• Heavy-gauge material provides added strength for solid and hollow-core door applications
• 5-knuckle, full mortise design for a flush, professional installation
• Square corners for standard mortise compatibility
• Countersunk screw holes allow fastener heads to sit flush with the hinge leaf
• Removable non-rising pin for easier installation and door removal
• Nob detail on hinge body for a finished, decorative appearance

Compatibility

Designed as an OEM-style replacement or new-installation hinge for standard full mortise door applications requiring a 3.5-inch square stainless steel hinge.

Installation Notes

Installation is performed by carpenters or general contractors as part of door hanging or replacement work. Power down any electric strike or access control hardware associated with the door before beginning work. A full mortise installation requires accurate routing of the hinge pocket in both the door edge and the door frame to achieve a flush fit. Follow applicable building codes for door hardware installation and use appropriately rated fasteners for the door and frame material.

Technical Specifications

• Size: 3.5 inches square
• Material: Stainless Steel
• Design: Full Mortise, 5 Knuckle
• Corner Style: Square
• Pin Type: Non-Rising, Removable
• Screw Holes: Countersunk
• Weight: 0.532 pounds
• UPC: 00038613225923

Standard Information

• Brand: NATIONAL MARKER
• Manufacturer Part Number: N225920