{"product_id":"ives-3sp1-4-5-x-4-5-inch-3-knuckle-spring-hinge","title":"Ives 3SP1 4.5 x 4.5 Inch 3-Knuckle Spring Hinge","description":"\u003ch2\u003eIves 3SP1 4.5 x 4.5 Inch 3-Knuckle Spring Hinge\u003c\/h2\u003e\u003cp\u003eThe Ives 3SP1 4.5 x 4.5 Inch 3-Knuckle Spring Hinge is a self-closing hinge engineered to automatically return doors to the closed position without the need for a separate door closer. Featuring a full mortise design with a square corner profile, this hinge suits both residential and light commercial openings where controlled, reliable closing is required. The adjustable spring tension lets you fine-tune the closing force to match the weight and swing of the door. Built for durability and smooth operation, the 3SP1 offers an economical self-closing solution that installs easily and performs consistently over years of daily use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSelf-closing spring mechanism eliminates the need for a separate door closer on many applications.\u003c\/li\u003e\n\u003cli\u003eThree-knuckle design provides a clean, traditional appearance with dependable alignment.\u003c\/li\u003e\n\u003cli\u003eAdjustable spring tension allows precise control of the door's closing force.\u003c\/li\u003e\n\u003cli\u003eFull mortise installation with a square corner for standard door and frame preparation.\u003c\/li\u003e\n\u003cli\u003e4.5 x 4.5 inch size accommodates common interior and light commercial doors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFunctional Details\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 3SP1 uses an internal coiled spring within the hinge barrel to store energy as the door opens and release it to pull the door back to the closed position. Tension is set during installation using a tension pin and adjustment tool, giving the installer control over closing speed and force.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSpring hinge provides controlled, self-closing action for the door.\u003c\/li\u003e\n\u003cli\u003eAdjustable spring tension to suit door weight and closing requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Specifications\u003c\/h4\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003eIves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003ctd\u003e3SP1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003e3-Knuckle Spring Hinge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eFull Mortise\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorner Type\u003c\/th\u003e\n\u003ctd\u003eSquare Corner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eCommercial \/ Residential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eImported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnit of Measure\u003c\/th\u003e\n\u003ctd\u003eEach\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003ctd\u003eSelf-Closing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLimited Warranty\u003c\/th\u003e\n\u003ctd\u003eYes, per Ives manufacturer warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHinge Height\u003c\/th\u003e\n\u003ctd\u003e4.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHinge Width (Open)\u003c\/th\u003e\n\u003ctd\u003e4.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Knuckles\u003c\/th\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorner Radius\u003c\/th\u003e\n\u003ctd\u003eSquare Corner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCoiled, adjustable tension\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClosing Action\u003c\/th\u003e\n\u003ctd\u003eSelf-closing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTension Adjustment\u003c\/th\u003e\n\u003ctd\u003eAdjustable via tension pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInstallation Type\u003c\/th\u003e\n\u003ctd\u003eFull Mortise\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDoor Preparation\u003c\/th\u003e\n\u003ctd\u003eStandard 4.5 x 4.5 mortise cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eInterior \/ Light Commercial Doors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"IVES","offers":[{"title":"US32D-630 Satin Stainless Steel","offer_id":42441277833422,"sku":"3SP14545630","price":84.46,"currency_code":"USD","in_stock":true},{"title":"US10B-640 Oil Rubbed Bronze (Steel)","offer_id":42441274065102,"sku":"3SP14545640","price":62.28,"currency_code":"USD","in_stock":true},{"title":"F-BLK Matte Black","offer_id":48446516101326,"sku":"3SP14545FBLK","price":43.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/3493\/4478\/files\/ives-3sp1-4.5x4.5_d41b9702-d38b-4368-ad3a-a1a3a7554e30.jpg?v=1710262681","url":"https:\/\/qualitydoor.com\/products\/ives-3sp1-4-5-x-4-5-inch-3-knuckle-spring-hinge","provider":"QualityDoor.com","version":"1.0","type":"link"}