{"product_id":"soss-218icus19-invisible-spring-hinge-black-1-3-4-in-door","title":"Soss 218ICUS19 Invisible Spring Hinge Black 1-3\/4 in Door","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOSS UIP ALLEGION 218ICUS19 is a heavy-duty invisible spring hinge designed for 1-3\/4 inch thick doors, finished in black. When installed, the hinge is completely concealed within the door edge and frame, leaving no visible hardware on the door face. The spring mechanism provides automatic door return, making it well suited for high-traffic commercial and residential applications where a clean, hardware-free door appearance is required. Installed leaf dimensions measure 1-1\/8 inches wide by 4-5\/8 inches long. The unit ships as a single hinge and weighs approximately 2.9 pounds.\u003c\/p\u003e\n\u003cp\u003eThis invisible spring hinge is used in both residential and light commercial door installations where concealed hardware is specified — common in hospitality, office interiors, high-end residential millwork, and specialty door applications. Carpenters, finish carpenters, and door hardware installers typically work with this product. It is designed for use in 1-3\/4 inch thick door applications and is sold individually.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFully concealed when door is closed — no exposed knuckles or leaves on door face\u003c\/li\u003e\n  \u003cli\u003eIntegrated spring mechanism returns the door to closed position automatically\u003c\/li\u003e\n  \u003cli\u003eDesigned specifically for 1-3\/4 inch door thickness\u003c\/li\u003e\n  \u003cli\u003eLeaf dimensions: 1-1\/8 inches wide by 4-5\/8 inches long\u003c\/li\u003e\n  \u003cli\u003eBlack finish for consistent appearance in dark-frame and commercial door applications\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty construction suitable for frequent-use door cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation invisible spring hinge for 1-3\/4 inch thick doors requiring concealed hardware with automatic door return.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by a finish carpenter or qualified door hardware installer. Precise mortise routing into both the door edge and the door frame is required — use a router and hinge mortise template sized for this hinge model to ensure proper fit and spring tension alignment. Verify door weight and door thickness before installation, as improper mortise depth will affect spring function and door closure. Follow applicable building code requirements for door hardware in the jurisdiction of installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLeaf Width\u003c\/strong\u003e: 1-1\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLeaf Length\u003c\/strong\u003e: 4-5\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDoor Thickness (Application)\u003c\/strong\u003e: 1-3\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.9 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSales Unit\u003c\/strong\u003e: Each (EA)\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: SOSS UIP ALLEGION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 218ICUS19\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOSS","offers":[{"title":"Default Title","offer_id":51559689388338,"sku":"218ICUS19","price":210.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/fe4db18c2201361f27072c8cf935e8bb_b918dcf0-a8fc-4b0b-a78d-95148adbb2b6.jpg?v=1786438225","url":"https:\/\/voomisupply.com\/products\/soss-218icus19-invisible-spring-hinge-black-1-3-4-in-door","provider":"Voomi Supply","version":"1.0","type":"link"}