{"product_id":"national-mfg-n351-015-4-in-spring-adjustable-door-hinge-oil-rubbed","title":"National Mfg N351-015 4 in Spring Adjustable Door Hinge Oil Rubbed","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe NATIONAL MFG\/SPECTRUM BRANDS HHI N351-015 is a 4-inch spring adjustable door hinge finished in oil rubbed bronze. Manufactured from cold rolled steel, it is built for durability in both residential and light commercial door installations. The spring mechanism controls door closing automatically, with both closing speed and tension independently adjustable to suit the door weight and desired closing force. The hinge carries UL approval for fire door applications, making it suitable for code-required fire-rated assemblies. It fits standard hinge cutouts and features 5\/8-inch radius round corners for a clean, conventional appearance.\u003c\/p\u003e\n\u003cp\u003eThis hinge is appropriate for standard interior and fire-rated door installations where a self-closing function is required by building code or occupant safety preference. It is commonly specified on fire-rated corridor doors, stairwell entries, and utility room doors in residential and light commercial construction. The adjustable closing speed and tension settings allow installers to fine-tune performance on site without replacing hardware. The oil rubbed bronze finish suits period and transitional door hardware sets. Each package contains two hinges.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eAdjustable closing speed allows field tuning without additional tools or parts\u003c\/li\u003e\n  \u003cli\u003eAdjustable tension accommodates varying door weights and closing force requirements\u003c\/li\u003e\n  \u003cli\u003eUL approved for fire door applications, supporting code-compliant fire-rated assemblies\u003c\/li\u003e\n  \u003cli\u003eCold rolled steel construction provides strength and long-term durability\u003c\/li\u003e\n  \u003cli\u003eFits standard hinge cutouts for straightforward replacement or new installation\u003c\/li\u003e\n  \u003cli\u003e5\/8-inch radius round corners match conventional door prep dimensions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or upgrade hinge for standard 4-inch hinge cutout door preparations on residential and light commercial fire-rated and non-fire-rated doors.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by carpenters, finish trades, or door hardware specialists following applicable building and fire codes. Power down or disable any electrified hardware in the door assembly before beginning work. Confirm that the door and frame prep matches the 4-inch hinge size and 5\/8-inch radius corner profile before fastening. On fire-rated assemblies, verify that all hardware in the assembly, including hinges, latches, and closers, carries the appropriate UL or listing approval required by the authority having jurisdiction.\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: Oil Rubbed Bronze\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: 0.625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClosing Speed\u003c\/strong\u003e: Adjustable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTension\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: N351-015\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NATIONAL HARDWARE","offers":[{"title":"Default Title","offer_id":51557903597874,"sku":"N351-015","price":43.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f775730d88b571a10293997f98ff4e91.jpg?v=1786397868","url":"https:\/\/voomisupply.com\/products\/national-mfg-n351-015-4-in-spring-adjustable-door-hinge-oil-rubbed","provider":"Voomi Supply","version":"1.0","type":"link"}