National Mfg N350-868 4 in Satin Nickel Spring Door Hinge

Product Description

The NATIONAL MFG/SPECTRUM BRANDS HHI N350-868 is a 4-inch spring adjustable door hinge finished in satin nickel and manufactured from cold rolled steel. It is designed for interior and exterior door applications where controlled, automatic closing is required. Both closing speed and spring tension are independently adjustable, allowing the installer to fine-tune door operation to meet site conditions. The hinge carries UL approval for use on fire doors, making it suitable for code-required fire-rated assemblies. It fits a standard hinge cutout and features 1/4-inch radius round corners. Sold in a package of two, it is typically installed by finish carpenters, general contractors, or door hardware specialists.

This hinge is suited for residential and light commercial door installations where a self-closing mechanism is needed. Common applications include fire-rated corridor doors, utility room doors, stairwell access doors, and other assemblies that must comply with self-closing requirements under local building or fire codes. The satin nickel finish blends with standard door hardware in both residential and commercial settings. Because it fits a standard hinge cutout, it can serve as a direct replacement on existing door preparations without modification.

Key Features

• Adjustable closing speed allows field tuning to match door weight and swing requirements
• Adjustable spring tension provides independent control over return force
• UL approved for fire door applications, supporting code-compliant installations
• Fits standard hinge cutout for straightforward replacement or new installation
• 1/4-inch radius round corners for clean fitment in standard door prep
• Cold rolled steel construction with satin nickel finish

Compatibility

Designed as an OEM-style replacement or new-installation spring hinge for standard door preparations requiring a 4-inch self-closing hinge, including UL-listed fire door assemblies.

Installation Notes

Installation is performed by a finish carpenter, door hardware installer, or qualified general contractor. Power tools are not required, but a drill, chisel, and appropriate screwdrivers are standard. On fire-rated assemblies, verify that the complete door, frame, and hardware combination maintains the required fire rating per local building and fire codes before installation. Adjust closing speed and tension only with the door secured and no personnel in the swing path.