{"product_id":"national-mfg-n350-868-4-in-satin-nickel-spring-door-hinge","title":"National Mfg N350-868 4 in Satin Nickel Spring Door Hinge","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eAdjustable closing speed allows field tuning to match door weight and swing requirements\u003c\/li\u003e\n  \u003cli\u003eAdjustable spring tension provides independent control over return force\u003c\/li\u003e\n  \u003cli\u003eUL approved for fire door applications, supporting code-compliant installations\u003c\/li\u003e\n  \u003cli\u003eFits standard hinge cutout for straightforward replacement or new installation\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch radius round corners for clean fitment in standard door prep\u003c\/li\u003e\n  \u003cli\u003eCold rolled steel construction with satin nickel finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned 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.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation 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.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHinge Size\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Satin Nickel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cold Rolled Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClosing Speed\u003c\/strong\u003e: Adjustable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpring Tension\u003c\/strong\u003e: Adjustable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFire Door Rating\u003c\/strong\u003e: UL Approved\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.7 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: NATIONAL MFG\/SPECTRUM BRANDS HHI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: N350-868\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NATIONAL HARDWARE","offers":[{"title":"Default Title","offer_id":51557988630834,"sku":"N350-868","price":43.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/36ae431ad238d42ba9e2ad4e091399a8.jpg?v=1786400204","url":"https:\/\/voomisupply.com\/products\/national-mfg-n350-868-4-in-satin-nickel-spring-door-hinge","provider":"Voomi Supply","version":"1.0","type":"link"}