National Marker N350892 Spring Door Hinge 3.5 in Satin Nickel

Product Description

The NATIONAL MARKER N350892 is a 3.5-inch spring door hinge with a 5/8-inch corner radius, finished in satin nickel. Built from cold-rolled steel, it delivers the durability required for high-cycle commercial and residential door applications. The hinge features adjustable closing speed and adjustable tension, giving installers direct control over door operation without additional hardware. It is UL approved for use on fire doors, making it a code-compliant choice for rated door assemblies. Carpenters, general contractors, and facility maintenance technicians are the primary installers of this product.

This spring hinge is suited for interior door applications where self-closing function is required, including fire-rated corridor doors, stairwell access doors, and utility room entries. It fits a standard hinge cutout, simplifying retrofit installations where an existing hinge is being replaced. The satin nickel finish is commonly specified in commercial and light institutional settings. The catalog model reference is V522, which may assist in cross-referencing with legacy specifications or hardware schedules.

Key Features

• UL approved for fire door assemblies, supporting code-compliant installation in rated openings
• Adjustable closing speed allows field-tuning without additional hardware
• Adjustable tension accommodates varying door weights and swing resistance
• Cold-rolled steel construction provides durability in high-cycle applications
• Fits standard hinge cutout for straightforward retrofit and new-construction installs
• Satin nickel finish suits commercial and light institutional door hardware specifications

Compatibility

Designed as an OEM-style replacement or new-installation spring hinge for standard residential and commercial door frames with a 3.5-inch hinge cutout, including UL-listed fire-rated door assemblies.

Installation Notes

Installation is typically performed by a carpenter, general contractor, or facilities technician using standard hand tools. Before replacing an existing hinge, ensure the door is properly supported to prevent movement during the swap. When installing on fire-rated doors, verify the completed assembly meets the requirements of the applicable fire door listing and local building code. Adjust closing speed and tension only with the door secured and all fasteners fully seated.