{"product_id":"r4s-offshore-mooring-chain","title":"Grade R4S Offshore Mooring Chain — Stud Link","description":"\u003ch2\u003eGrade R4S Offshore Mooring Chain\u003c\/h2\u003e\n\u003cp\u003eAbove R4 for heavier design loads. Manufacturers’ proprietary specifications for R4S may vary subject to design conditions and class acceptance (W22 §1.2.2).\u003c\/p\u003e\n\u003cp\u003eStud link offshore mooring chain to \u003cstrong\u003eIACS UR W22\u003c\/strong\u003e, grade\n\u003cstrong\u003eR4S\u003c\/strong\u003e, in diameters from 50 mm to\n90 mm. Quoted on request.\u003c\/p\u003e\n\n\u003ch3\u003eMechanical properties\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eYield stress, minimum\u003c\/th\u003e\n\u003ctd\u003e700 N\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTensile strength, minimum\u003c\/th\u003e\n\u003ctd\u003e960 N\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eElongation, minimum\u003c\/th\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eReduction of area, minimum\u003c\/th\u003e\n\u003ctd\u003e50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eLoads, weight and pitch\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003cth\u003eProof load\u003c\/th\u003e\n\u003cth\u003eBreak load\u003c\/th\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003cth\u003e5-link pitch\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e50 mm\u003c\/strong\u003e (1.97 in)\u003c\/td\u003e\n\u003ctd\u003e2,400 kN\u003cbr\u003e245 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,040 kN\u003c\/strong\u003e\u003cbr\u003e310 t\u003c\/td\u003e\n\u003ctd\u003e54.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,100–1,128 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e52 mm\u003c\/strong\u003e (2.05 in)\u003c\/td\u003e\n\u003ctd\u003e2,585 kN\u003cbr\u003e264 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,275 kN\u003c\/strong\u003e\u003cbr\u003e334 t\u003c\/td\u003e\n\u003ctd\u003e59.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,144–1,173 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e54 mm\u003c\/strong\u003e (2.13 in)\u003c\/td\u003e\n\u003ctd\u003e2,777 kN\u003cbr\u003e283 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,517 kN\u003c\/strong\u003e\u003cbr\u003e359 t\u003c\/td\u003e\n\u003ctd\u003e63.9 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,188–1,218 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e56 mm\u003c\/strong\u003e (2.20 in)\u003c\/td\u003e\n\u003ctd\u003e2,974 kN\u003cbr\u003e303 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,768 kN\u003c\/strong\u003e\u003cbr\u003e384 t\u003c\/td\u003e\n\u003ctd\u003e68.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,232–1,263 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e58 mm\u003c\/strong\u003e (2.28 in)\u003c\/td\u003e\n\u003ctd\u003e3,178 kN\u003cbr\u003e324 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,025 kN\u003c\/strong\u003e\u003cbr\u003e411 t\u003c\/td\u003e\n\u003ctd\u003e73.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,276–1,308 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e60 mm\u003c\/strong\u003e (2.36 in)\u003c\/td\u003e\n\u003ctd\u003e3,387 kN\u003cbr\u003e345 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,290 kN\u003c\/strong\u003e\u003cbr\u003e438 t\u003c\/td\u003e\n\u003ctd\u003e78.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,320–1,353 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e62 mm\u003c\/strong\u003e (2.44 in)\u003c\/td\u003e\n\u003ctd\u003e3,602 kN\u003cbr\u003e367 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,562 kN\u003c\/strong\u003e\u003cbr\u003e465 t\u003c\/td\u003e\n\u003ctd\u003e84.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,364–1,398 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e64 mm\u003c\/strong\u003e (2.52 in)\u003c\/td\u003e\n\u003ctd\u003e3,822 kN\u003cbr\u003e390 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,841 kN\u003c\/strong\u003e\u003cbr\u003e494 t\u003c\/td\u003e\n\u003ctd\u003e89.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,408–1,443 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e66 mm\u003c\/strong\u003e (2.60 in)\u003c\/td\u003e\n\u003ctd\u003e4,048 kN\u003cbr\u003e413 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,127 kN\u003c\/strong\u003e\u003cbr\u003e523 t\u003c\/td\u003e\n\u003ctd\u003e95.4 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,452–1,488 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e68 mm\u003c\/strong\u003e (2.68 in)\u003c\/td\u003e\n\u003ctd\u003e4,279 kN\u003cbr\u003e436 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,420 kN\u003c\/strong\u003e\u003cbr\u003e553 t\u003c\/td\u003e\n\u003ctd\u003e101.3 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,496–1,533 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e70 mm\u003c\/strong\u003e (2.76 in)\u003c\/td\u003e\n\u003ctd\u003e4,516 kN\u003cbr\u003e461 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,720 kN\u003c\/strong\u003e\u003cbr\u003e583 t\u003c\/td\u003e\n\u003ctd\u003e107.3 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,540–1,579 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e73 mm\u003c\/strong\u003e (2.87 in)\u003c\/td\u003e\n\u003ctd\u003e4,881 kN\u003cbr\u003e498 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,182 kN\u003c\/strong\u003e\u003cbr\u003e630 t\u003c\/td\u003e\n\u003ctd\u003e116.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,606–1,646 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e76 mm\u003c\/strong\u003e (2.99 in)\u003c\/td\u003e\n\u003ctd\u003e5,257 kN\u003cbr\u003e536 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,658 kN\u003c\/strong\u003e\u003cbr\u003e679 t\u003c\/td\u003e\n\u003ctd\u003e126.5 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,672–1,714 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e78 mm\u003c\/strong\u003e (3.07 in)\u003c\/td\u003e\n\u003ctd\u003e5,514 kN\u003cbr\u003e562 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,984 kN\u003c\/strong\u003e\u003cbr\u003e712 t\u003c\/td\u003e\n\u003ctd\u003e133.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,716–1,759 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e84 mm\u003c\/strong\u003e (3.31 in)\u003c\/td\u003e\n\u003ctd\u003e6,313 kN\u003cbr\u003e644 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e7,997 kN\u003c\/strong\u003e\u003cbr\u003e815 t\u003c\/td\u003e\n\u003ctd\u003e154.5 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,848–1,894 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e87 mm\u003c\/strong\u003e (3.43 in)\u003c\/td\u003e\n\u003ctd\u003e6,729 kN\u003cbr\u003e686 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e8,523 kN\u003c\/strong\u003e\u003cbr\u003e869 t\u003c\/td\u003e\n\u003ctd\u003e165.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,914–1,962 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e90 mm\u003c\/strong\u003e (3.54 in)\u003c\/td\u003e\n\u003ctd\u003e7,154 kN\u003cbr\u003e730 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e9,062 kN\u003c\/strong\u003e\u003cbr\u003e924 t\u003c\/td\u003e\n\u003ctd\u003e177.4 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,980–2,030 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eProof and break loads calculated from the IACS UR W22 formulas. Tonnes\nare metric tonnes-force, given for comparison — the specification works in\nkN.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eAny diameter, not just the ones listed\u003c\/h3\u003e\n\u003cp\u003eW22 does not publish a load table — it publishes formulas, so the figures\nabove are calculated rather than looked up and we can quote a diameter that is\nnot on the list. For \u003cstrong\u003eR4S stud link\u003c\/strong\u003e, with \u003cem\u003ed\u003c\/em\u003e in\nmillimetres and the result in kN:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eProof load\u003c\/th\u003e\n\u003ctd\u003e0.024 × d² × (44 − 0.08d)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBreak load\u003c\/th\u003e\n\u003ctd\u003e0.0304 × d² × (44 − 0.08d)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight, stud link\u003c\/th\u003e\n\u003ctd\u003e0.0219 × d² kg\/m\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eFive link pitch\u003c\/th\u003e\n\u003ctd\u003e22d minimum, 22.55d maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eStudless chain is available in every grade. Its break loads are identical to\nstud link; the proof loads are lower above R3, and weight is calculated per\ndesign and submitted to class. Studless is normally deployed once, for permanent\nmoorings with a predetermined design life (W22 §1.1.3).\u003c\/p\u003e\n\n\u003ch3\u003eAccessories — do not substitute anchor chain parts\u003c\/h3\u003e\n\u003cp\u003eW22 covers the mooring accessories as well as the chain: common stud and\nstudless links, connecting common links, enlarged links, end links, detachable\nconnecting links, end shackles, subsea connectors, swivels and swivel shackles.\nKenter shackles are covered too, with their own machining requirement — the\nfillet radius must be at least 3 percent of nominal diameter (§3.1.3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThey are made to the R grade, and they are not interchangeable with\nanchor chain accessories.\u003c\/strong\u003e W22 §1.2.3 is explicit that each grade is\napproved individually and that approval for a higher grade does not constitute\napproval of a lower one, and §1.6.1 requires the forge or foundry supplying\naccessories to be separately approved by the Classification Society. A Grade 3\nKenter made for anchor chain is not an R4 mooring Kenter, whatever the diameter\nsays.\u003c\/p\u003e\n\u003cp\u003eLooking for ship's anchor chain rather than offshore mooring? That is\nGrade 1\/2\/3 to IACS UR A1 — see\n\u003ca href=\"\/collections\/stud-link-anchor-chain\"\u003estud link anchor chain\u003c\/a\u003e and the\n\u003ca href=\"\/collections\/lr-kenter-shackles\"\u003eKenter joining shackles\u003c\/a\u003e that go\nwith it.\u003c\/p\u003e\n\n\u003ch3\u003eORQ — the name this used to have\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eORQ, \"Oil Rig Quality\"\u003c\/strong\u003e, is the older name for offshore\nmooring chain, from before IACS formalised the R grades. It still turns up\nconstantly in enquiries, drawings and rig inventories, and it sits at the bottom\nof the modern range — broadly where \u003cstrong\u003eR3\u003c\/strong\u003e is now.\u003c\/p\u003e\n\u003cp\u003eIf your specification, your rig drawing or your old certificate says ORQ, we\ncan quote it. See \u003ca href=\"\/pages\/orq-and-oversize-mooring-chain\"\u003eORQ and\noversize mooring chain\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eLarger than 90 mm\u003c\/h3\u003e\n\u003cp\u003eThe sizes listed match the diameters we carry across the rest of the range,\nso every chain size has a \u003ca href=\"\/collections\/lr-kenter-shackles\"\u003eKenter\njoining shackle\u003c\/a\u003e to pair with it. \u003cstrong\u003eAbove 90 mm the chain is made to\norder\u003c\/strong\u003e — W22's own tolerance bands run to 222 mm and the formulas above\nhold the whole way, so we can quote any diameter exactly.\n\u003ca href=\"\/pages\/orq-and-oversize-mooring-chain\"\u003eTell us what you need\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eCertification\u003c\/h3\u003e\n\u003cp\u003eSupplied with Classification Society certification. Chain is manufactured in\ncontinuous lengths by flash butt welding and heat treated in a continuous\nfurnace — batch heat treatment is not permitted (§3.2.1.1). Link shape and\nproportion conform to \u003cstrong\u003eISO 1704\u003c\/strong\u003e or a specially approved design.\u003c\/p\u003e\n\u003cp\u003eTell us the grade, the diameter, the length and the society, and we will quote\nit delivered.\u003c\/p\u003e","brand":"Dibblee","offers":[{"title":"50 mm — break 3,040 kN (310 t)","offer_id":50201028231445,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"52 mm — break 3,275 kN (334 t)","offer_id":50201028264213,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"54 mm — break 3,517 kN (359 t)","offer_id":50201028296981,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"56 mm — break 3,768 kN (384 t)","offer_id":50201028329749,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"58 mm — break 4,025 kN (411 t)","offer_id":50201028362517,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"60 mm — break 4,290 kN (438 t)","offer_id":50201028395285,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"62 mm — break 4,562 kN (465 t)","offer_id":50201028428053,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"64 mm — break 4,841 kN (494 t)","offer_id":50201028460821,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"66 mm — break 5,127 kN (523 t)","offer_id":50201028493589,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"68 mm — break 5,420 kN (553 t)","offer_id":50201028526357,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"70 mm — break 5,720 kN (583 t)","offer_id":50201028559125,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"73 mm — break 6,182 kN (630 t)","offer_id":50201028591893,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"76 mm — break 6,658 kN (679 t)","offer_id":50201028624661,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"78 mm — break 6,984 kN (712 t)","offer_id":50201028657429,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"84 mm — break 7,997 kN (815 t)","offer_id":50201028690197,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"87 mm — break 8,523 kN (869 t)","offer_id":50201028722965,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"90 mm — break 9,062 kN (924 t)","offer_id":50201028755733,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.kentershackle.com\/products\/r4s-offshore-mooring-chain","provider":"Kenter Shackles","version":"1.0","type":"link"}