{"product_id":"r5-offshore-mooring-chain","title":"Grade R5 Offshore Mooring Chain — Stud Link","description":"\u003ch2\u003eGrade R5 Offshore Mooring Chain\u003c\/h2\u003e\n\u003cp\u003eThe highest grade in W22, for extreme design loads and the deepest moorings. As with R4S, the specification may vary with design conditions and must be accepted by the Classification Society.\u003c\/p\u003e\n\u003cp\u003eStud link offshore mooring chain to \u003cstrong\u003eIACS UR W22\u003c\/strong\u003e, grade\n\u003cstrong\u003eR5\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\u003e760 N\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTensile strength, minimum\u003c\/th\u003e\n\u003ctd\u003e1000 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\u003e2,510 kN\u003cbr\u003e256 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,200 kN\u003c\/strong\u003e\u003cbr\u003e326 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\u003e2,704 kN\u003cbr\u003e276 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,447 kN\u003c\/strong\u003e\u003cbr\u003e352 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\u003e2,904 kN\u003cbr\u003e296 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,703 kN\u003c\/strong\u003e\u003cbr\u003e378 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\u003e3,111 kN\u003cbr\u003e317 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,966 kN\u003c\/strong\u003e\u003cbr\u003e404 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\u003e3,323 kN\u003cbr\u003e339 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,237 kN\u003c\/strong\u003e\u003cbr\u003e432 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\u003e3,542 kN\u003cbr\u003e361 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,516 kN\u003c\/strong\u003e\u003cbr\u003e461 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\u003e3,767 kN\u003cbr\u003e384 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,802 kN\u003c\/strong\u003e\u003cbr\u003e490 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\u003e3,997 kN\u003cbr\u003e408 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,096 kN\u003c\/strong\u003e\u003cbr\u003e520 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\u003e4,233 kN\u003cbr\u003e432 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,397 kN\u003c\/strong\u003e\u003cbr\u003e550 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\u003e4,475 kN\u003cbr\u003e456 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,706 kN\u003c\/strong\u003e\u003cbr\u003e582 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\u003e4,723 kN\u003cbr\u003e482 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,021 kN\u003c\/strong\u003e\u003cbr\u003e614 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\u003e5,104 kN\u003cbr\u003e521 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,507 kN\u003c\/strong\u003e\u003cbr\u003e664 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\u003e5,498 kN\u003cbr\u003e561 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e7,009 kN\u003c\/strong\u003e\u003cbr\u003e715 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\u003e5,766 kN\u003cbr\u003e588 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e7,351 kN\u003c\/strong\u003e\u003cbr\u003e750 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\u003e6,602 kN\u003cbr\u003e673 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e8,418 kN\u003c\/strong\u003e\u003cbr\u003e858 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\u003e7,037 kN\u003cbr\u003e718 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e8,971 kN\u003c\/strong\u003e\u003cbr\u003e915 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\u003e7,482 kN\u003cbr\u003e763 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e9,539 kN\u003c\/strong\u003e\u003cbr\u003e973 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\u003eR5 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\u003e0.0251 × d² × (44 − 0.08d)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBreak load\u003c\/th\u003e\n\u003ctd\u003e0.032 × 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 3,200 kN (326 t)","offer_id":50201028886805,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"52 mm — break 3,447 kN (352 t)","offer_id":50201028919573,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"54 mm — break 3,703 kN (378 t)","offer_id":50201028952341,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"56 mm — break 3,966 kN (404 t)","offer_id":50201028985109,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"58 mm — break 4,237 kN (432 t)","offer_id":50201029017877,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"60 mm — break 4,516 kN (461 t)","offer_id":50201029050645,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"62 mm — break 4,802 kN (490 t)","offer_id":50201029083413,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"64 mm — break 5,096 kN (520 t)","offer_id":50201029116181,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"66 mm — break 5,397 kN (550 t)","offer_id":50201029148949,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"68 mm — break 5,706 kN (582 t)","offer_id":50201029181717,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"70 mm — break 6,021 kN (614 t)","offer_id":50201029214485,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"73 mm — break 6,507 kN (664 t)","offer_id":50201029247253,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"76 mm — break 7,009 kN (715 t)","offer_id":50201029280021,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"78 mm — break 7,351 kN (750 t)","offer_id":50201029312789,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"84 mm — break 8,418 kN (858 t)","offer_id":50201029345557,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"87 mm — break 8,971 kN (915 t)","offer_id":50201029378325,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"90 mm — break 9,539 kN (973 t)","offer_id":50201029411093,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.kentershackle.com\/products\/r5-offshore-mooring-chain","provider":"Kenter Shackles","version":"1.0","type":"link"}