{"product_id":"king-chain-g30-proof-coil-chain-price-per-foot-select-size","title":"King Chain Grade 30 Proof Coil Chain, Sold Per Foot, Select Size","description":"\u003cstyle\u003e\n.gb-wrap{max-width:100%;font-size:15px;line-height:1.6}\n.gb-wrap h2{font-size:1.25rem;margin:0 0 .6em}\n.gb-intro p{margin:0 0 .9em}\n.gb-hl{margin:0 0 1.2em 1.1em;padding:0}\n.gb-hl li{margin:.32em 0}\n.gb-acc{border-top:1px solid #ddd;padding:.65em 0}\n.gb-acc:last-of-type{border-bottom:1px solid #ddd}\n.gb-acc\u003esummary{cursor:pointer;font-weight:600;list-style:none;padding:.2em 0}\n.gb-acc\u003esummary::-webkit-details-marker{display:none}\n.gb-acc\u003esummary::after{content:\"+\";float:right;font-weight:400}\n.gb-acc[open]\u003esummary::after{content:\"\\2013\"}\n.gb-acc .gb-body{padding:.4em 0 .9em}\n.gb-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}\n.gb-scroll table{border-collapse:collapse;min-width:520px;width:100%;font-size:14px}\n.gb-scroll th,.gb-scroll td{border:1px solid #ddd;padding:.45em .6em;text-align:left}\n.gb-scroll th{background:#f6f6f6;font-weight:600}\n.gb-wrap ul{margin:0 0 .9em 1.1em;padding:0}\n.gb-wrap li{margin:.25em 0}\n\u003c\/style\u003e\n\u003cdiv class=\"gb-wrap\"\u003e\n\u003ch2\u003eKing Chain Grade 30 Proof Coil Chain\u003c\/h2\u003e\n\u003cdiv class=\"gb-intro\"\u003e\n\u003cp\u003eGrade 30 proof coil is the general-purpose welded steel chain. It covers the ordinary jobs that do not need high-strength alloy: tie-downs, light towing, guard chains, farm and yard work.\u003c\/p\u003e\n\u003cp\u003eGrade 30 is not a lifting chain. Only Grade 80 and Grade 100 alloy may be used overhead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cul class=\"gb-hl\"\u003e\n\u003cli\u003eWorking load limits from 800 lb. at 3\/16 in. up to 2,650 lb. at 3\/8 in.\u003c\/li\u003e\n\u003cli\u003eFour sizes, cut to the linear foot\u003c\/li\u003e\n\u003cli\u003eRated to NACM and ASTM A413\/A413M rather than by the seller, so a Grade 30 chain of a given size carries the same rating whoever made it\u003c\/li\u003e\n\u003cli\u003e4 to 1 design factor\u003c\/li\u003e\n\u003cli\u003eCarbon steel, welded\u003c\/li\u003e\n\u003cli\u003eTie-downs, light towing, guard chains, farm and yard work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdetails class=\"gb-acc\" open\u003e\u003csummary\u003eWorking load limits by size\u003c\/summary\u003e\u003cdiv class=\"gb-body\"\u003e\n\u003cdiv class=\"gb-scroll\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eChain size\u003c\/th\u003e\n\u003cth\u003eMaterial diameter\u003c\/th\u003e\n\u003cth\u003eWorking load limit\u003c\/th\u003e\n\u003cth\u003eInside length (max.)\u003c\/th\u003e\n\u003cth\u003eInside width (min.)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\/16 in.\u003c\/td\u003e\n\u003ctd\u003e0.217 in.\u003c\/td\u003e\n\u003ctd\u003e800 lb.\u003c\/td\u003e\n\u003ctd\u003e0.98 in.\u003c\/td\u003e\n\u003ctd\u003e0.30 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\/4 in.\u003c\/td\u003e\n\u003ctd\u003e0.276 in.\u003c\/td\u003e\n\u003ctd\u003e1,300 lb.\u003c\/td\u003e\n\u003ctd\u003e1.24 in.\u003c\/td\u003e\n\u003ctd\u003e0.38 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5\/16 in.\u003c\/td\u003e\n\u003ctd\u003e0.331 in.\u003c\/td\u003e\n\u003ctd\u003e1,900 lb.\u003c\/td\u003e\n\u003ctd\u003e1.29 in.\u003c\/td\u003e\n\u003ctd\u003e0.44 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\/8 in.\u003c\/td\u003e\n\u003ctd\u003e0.394 in.\u003c\/td\u003e\n\u003ctd\u003e2,650 lb.\u003c\/td\u003e\n\u003ctd\u003e1.38 in.\u003c\/td\u003e\n\u003ctd\u003e0.55 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"gb-acc\"\u003e\u003csummary\u003eQuestions\u003c\/summary\u003e\u003cdiv class=\"gb-body\"\u003e\n\u003cp\u003e\u003cstrong\u003eWhich size do I need?\u003c\/strong\u003e\u003cbr\u003eWork from the load, not from the look of the chain. 3\/16 in. carries 800 lb., 1\/4 in. 1,300 lb., 5\/16 in. 1,900 lb. and 3\/8 in. 2,650 lb. Then leave margin for anything dynamic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it to lift?\u003c\/strong\u003e\u003cbr\u003eNo. Grade 30 must not be used for overhead lifting. NACM restricts that to Grade 80 and Grade 100 alloy chain.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the 4 to 1 design factor mean?\u003c\/strong\u003e\u003cbr\u003eThe published working load limit is a quarter of the minimum breaking force. That margin covers wear, shock and the fact that real loads are rarely in pure straight tension. It is not spare capacity to use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Grade 30 and Grade 43?\u003c\/strong\u003e\u003cbr\u003eGrade 43 high test is stronger for the same size. A 1\/4 in. Grade 43 carries 2,600 lb. against 1,300 lb. for Grade 30. Neither may be used overhead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it marked?\u003c\/strong\u003e\u003cbr\u003e5\/16 in. and larger Grade 30 is embossed with 3, 30 or 300 at intervals. Marking on 1\/4 in. and smaller is optional for the manufacturer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I retire a chain?\u003c\/strong\u003e\u003cbr\u003eWhen any link has worn below its minimum allowable thickness, or shows nicks, gouges, cracks or stretch. A stretched chain has already been overloaded.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"KINGCHAIN","offers":[{"title":"3\/16\"","offer_id":53099624137023,"sku":"540671","price":1.25,"currency_code":"CAD","in_stock":true},{"title":"1\/4\"","offer_id":53099624169791,"sku":"540871","price":2.08,"currency_code":"CAD","in_stock":true},{"title":"5\/16\"","offer_id":53099624202559,"sku":"540961","price":2.77,"currency_code":"CAD","in_stock":true},{"title":"3\/8\"","offer_id":53099624235327,"sku":"541111","price":4.37,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/4901\/7919\/files\/g30chain.jpg?v=1779738725","url":"https:\/\/griffbuildingsupplies.com\/products\/king-chain-g30-proof-coil-chain-price-per-foot-select-size","provider":"Griff Building Supplies","version":"1.0","type":"link"}