{"product_id":"commercial-door-spring-hinges-standard-weight-fire-rated-4-5-x-4-5-ball-bearing-brushed-chrome-us26d-1-pack-lawrence-hardware","title":"Spring Hinges for Commercial Doors, Fire Rated, 4.5 x 4.5, Concealed Bearing, Brushed Chrome (US26D)","description":"\u003cp\u003eA \u003cstrong\u003e4.5\" x 4.5\"\u003c\/strong\u003e steel \u003cstrong\u003espring hinge\u003c\/strong\u003e with concealed bearings. Unlike an ordinary butt hinge it is \u003cstrong\u003eself-closing\u003c\/strong\u003e — the spring inside the barrel shuts the door behind whoever went through it, with no door closer mounted on the frame.\u003c\/p\u003e\u003ch2\u003eWhy a spring hinge rather than a door closer\u003c\/h2\u003e\u003cp\u003eIt does the closing job from inside the hinge, so nothing is bolted to the face of the door or the frame. On an apartment, hotel or condo door that has to self-close for code but should not look like a commercial entrance, that matters. The \u003cstrong\u003espring tension is adjustable\u003c\/strong\u003e, so the closing force gets set to the door at installation.\u003c\/p\u003e\u003ch2\u003eWhat to check before you order\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow many you need.\u003c\/strong\u003e This is the important one. For a door between \u003cstrong\u003e70 lbs and 120 lbs, plan on one to three spring hinges\u003c\/strong\u003e — the heavier the door, the more of them it takes to close it reliably. They are usually mixed with ordinary butt hinges on the same door.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFire doors.\u003c\/strong\u003e On a fire-rated door, \u003cstrong\u003eat least two of the hinges must be spring hinges\u003c\/strong\u003e, in the center and bottom positions. This hinge is ANSI\/BHMA A156.17 certified and UL\/cUL listed as fire rated, so it holds up at inspection.\u003c\/p\u003e\u003cp\u003eGrade 1 steel at 0.134\" thick, heavy enough for apartment, hotel, condo and office doors.\u003c\/p\u003e","brand":"Lawrence Hardware","offers":[{"title":"Default Title","offer_id":49012598046970,"sku":"LH606SH-4545-US26D","price":32.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0840\/3019\/3914\/files\/1438273-scaled.jpg?v=1781565018","url":"https:\/\/www.homebuildershardware.com\/products\/commercial-door-spring-hinges-standard-weight-fire-rated-4-5-x-4-5-ball-bearing-brushed-chrome-us26d-1-pack-lawrence-hardware","provider":"Homebuilders Hardware","version":"1.0","type":"link"}