{"product_id":"shaft-anodes","title":"Propeller Shaft Anodes — Streamlined Collar","description":"\u003ch2\u003ePropeller Shaft Anodes — Streamlined Collar\u003c\/h2\u003e\n\u003cp\u003eTwo-piece streamlined collar anodes that clamp directly to the propeller\nshaft, in \u003cstrong\u003e31 sizes from 1\/2 in to 6 in and 25 mm to 60 mm\u003c\/strong\u003e.\nAvailable in zinc, aluminium or magnesium — tell us the water and we will quote\nthe right alloy.\u003c\/p\u003e\n\n\u003ch3\u003eImperial shafts\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eShaft diameter\u003c\/th\u003e\n\u003cth\u003eEquivalent\u003c\/th\u003e\n\u003cth\u003eTypical weight\u003c\/th\u003e\n\u003cth\u003eCommon reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12.7 mm\u003c\/td\u003e\n\u003ctd\u003e0.23 kg (0.51 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX00\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e19.05 mm\u003c\/td\u003e\n\u003ctd\u003e0.38 kg (0.84 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX01\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e7\/8 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e22.23 mm\u003c\/td\u003e\n\u003ctd\u003e0.43 kg (0.95 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX02\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25.4 mm\u003c\/td\u003e\n\u003ctd\u003e0.45 kg (0.99 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX03\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/8 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e28.58 mm\u003c\/td\u003e\n\u003ctd\u003e0.52 kg (1.15 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX04\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e31.75 mm\u003c\/td\u003e\n\u003ctd\u003e0.53 kg (1.17 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX05\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e1-1\/4 in\u003c\/strong\u003e (extra heavy)\u003c\/td\u003e\n\u003ctd\u003e31.75 mm\u003c\/td\u003e\n\u003ctd\u003e0.79 kg (1.74 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX05A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-3\/8 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e34.93 mm\u003c\/td\u003e\n\u003ctd\u003e0.67 kg (1.48 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX06\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38.1 mm\u003c\/td\u003e\n\u003ctd\u003e0.76 kg (1.68 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX07\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1-3\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e44.45 mm\u003c\/td\u003e\n\u003ctd\u003e1.13 kg (2.49 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX08\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50.8 mm\u003c\/td\u003e\n\u003ctd\u003e1.41 kg (3.11 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX09\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2-1\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e57.15 mm\u003c\/td\u003e\n\u003ctd\u003e2.76 kg (6.08 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2-1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e63.5 mm\u003c\/td\u003e\n\u003ctd\u003e2.35 kg (5.18 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX11\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2-3\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e69.85 mm\u003c\/td\u003e\n\u003ctd\u003e3.42 kg (7.54 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e76.2 mm\u003c\/td\u003e\n\u003ctd\u003e2.97 kg (6.55 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX13\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3-1\/4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e82.55 mm\u003c\/td\u003e\n\u003ctd\u003e3.27 kg (7.21 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX14Z\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3-1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e88.9 mm\u003c\/td\u003e\n\u003ctd\u003e4.10 kg (9.04 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX15\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e4 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e101.6 mm\u003c\/td\u003e\n\u003ctd\u003e4.04 kg (8.91 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX17\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e4-1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e114.3 mm\u003c\/td\u003e\n\u003ctd\u003e5.63 kg (12.41 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX18\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e127 mm\u003c\/td\u003e\n\u003ctd\u003e4.20 kg (9.26 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX19\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5-1\/2 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e139.7 mm\u003c\/td\u003e\n\u003ctd\u003e7.24 kg (15.96 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e6 in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e152.4 mm\u003c\/td\u003e\n\u003ctd\u003e5.44 kg (11.99 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX21\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eMetric shafts\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eShaft diameter\u003c\/th\u003e\n\u003cth\u003eEquivalent\u003c\/th\u003e\n\u003cth\u003eTypical weight\u003c\/th\u003e\n\u003cth\u003eCommon reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e25 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.984 in\u003c\/td\u003e\n\u003ctd\u003e0.549 kg (1.21 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX25\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e28 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.102 in\u003c\/td\u003e\n\u003ctd\u003e0.581 kg (1.28 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX28Z\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e30 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.181 in\u003c\/td\u003e\n\u003ctd\u003e0.558 kg (1.23 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX30\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e35 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.378 in\u003c\/td\u003e\n\u003ctd\u003e0.730 kg (1.61 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX35\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e40 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.575 in\u003c\/td\u003e\n\u003ctd\u003e1.429 kg (3.15 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX40\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e45 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.772 in\u003c\/td\u003e\n\u003ctd\u003e1.261 kg (2.78 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX45\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e50 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.969 in\u003c\/td\u003e\n\u003ctd\u003e1.075 kg (2.37 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e55 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.165 in\u003c\/td\u003e\n\u003ctd\u003e2.735 kg (6.03 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX55\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e60 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.362 in\u003c\/td\u003e\n\u003ctd\u003e2.672 kg (5.89 lb)\u003c\/td\u003e\n\u003ctd\u003eCMX60\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eThe anode is sized by the shaft it clamps to, so each size is listed in\nthe shaft's own unit with the equivalent alongside. Measure the shaft, do not\nmeasure the old anode — a half-wasted anode reads undersize. Weights are typical\nfor the streamlined profile and are confirmed at quotation.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eGot an old part number?\u003c\/h3\u003e\n\u003cp\u003eThe reference column above is the number most commonly cast into this style of\nanode. If the number on the one you removed is not there, send us a photo of it\nand the shaft diameter and we will match it — most aftermarket numbering\ndescends from the same US military specification, so nearly everything\ncross-references.\u003c\/p\u003e\n\n\u003ch3\u003eWhich alloy\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eZinc\u003c\/th\u003e\n\u003ctd\u003eSalt water. To \u003cstrong\u003eASTM B418 Type I\u003c\/strong\u003e — the alloyed\n    seawater grade, whose composition also meets \u003cstrong\u003eMIL-A-18001K\u003c\/strong\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eAluminium\u003c\/th\u003e\n\u003ctd\u003eSalt and brackish water. Al-Zn-In alloy; longer life\n    per kilogram and now the default on new offshore work.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eMagnesium\u003c\/th\u003e\n\u003ctd\u003eFresh water only, to \u003cstrong\u003eASTM B843\u003c\/strong\u003e. Never\n    use it as a saltwater substitute — it wastes in months.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor fresh water and buried service in zinc, \u003cstrong\u003eASTM B418 Type II\u003c\/strong\u003e is\nthe high-purity grade. Tell us the water and we will quote the right alloy rather\nthan assume.\u003c\/p\u003e\n\n\u003ch3\u003eSizing\u003c\/h3\u003e\n\u003cp\u003eThe material specs say nothing about how much anode to fit. That comes from\n\u003cstrong\u003eABYC E-2\u003c\/strong\u003e for boats and \u003cstrong\u003eDNV-RP-B401\u003c\/strong\u003e for ships and\noffshore structures, which size the anode mass against the area to be protected,\nthe current density and the design life.\u003c\/p\u003e\n\u003cp\u003eWhatever the calculation says, the maintenance rule is the same:\n\u003cstrong\u003ereplace at about 50% wasted.\u003c\/strong\u003e A half-wasted anode is not a\nhalf-working anode — output falls away as surface area is lost, so the last half\nprotects far less than the first.\u003c\/p\u003e\n\n\u003ch3\u003eWhat to put on your purchase order\u003c\/h3\u003e\n\u003cp\u003eZinc anodes fail by \u003cstrong\u003epassivating\u003c\/strong\u003e — they skin over and stop\nproducing current while still looking perfectly serviceable on the shaft. The\nusual cause is iron contamination, which is exactly what ASTM B418 caps at\n0.005%. Specify \u003cstrong\u003e\"to ASTM B418 Type I, mill certificate with each\nlot\"\u003c\/strong\u003e and you have something to test against. Without it, a cheap anode\nthat does nothing looks identical to a good one until the shaft is pitted.\u003c\/p\u003e\n\u003cp\u003eSee the \u003ca href=\"\/pages\/anodes\"\u003eanode selection guide\u003c\/a\u003e for the full alloy,\nsizing and specification detail.\u003c\/p\u003e","brand":"Dibblee","offers":[{"title":"1\/2 in shaft (12.7 mm)","offer_id":50199364174101,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"3\/4 in shaft (19.05 mm)","offer_id":50199364206869,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"7\/8 in shaft (22.23 mm)","offer_id":50199364239637,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1 in shaft (25.4 mm)","offer_id":50199364272405,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-1\/8 in shaft (28.58 mm)","offer_id":50199364305173,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-1\/4 in shaft (31.75 mm)","offer_id":50199364337941,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-1\/4 in shaft (31.75 mm) — extra heavy","offer_id":50199364370709,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-3\/8 in shaft (34.93 mm)","offer_id":50199364403477,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-1\/2 in shaft (38.1 mm)","offer_id":50199364436245,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"1-3\/4 in shaft (44.45 mm)","offer_id":50199364469013,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"2 in shaft (50.8 mm)","offer_id":50199364501781,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"2-1\/4 in shaft (57.15 mm)","offer_id":50199364534549,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"2-1\/2 in shaft (63.5 mm)","offer_id":50199364567317,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"2-3\/4 in shaft (69.85 mm)","offer_id":50199364600085,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"3 in shaft (76.2 mm)","offer_id":50199364632853,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"3-1\/4 in shaft (82.55 mm)","offer_id":50199364665621,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"3-1\/2 in shaft (88.9 mm)","offer_id":50199364698389,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"4 in shaft (101.6 mm)","offer_id":50199364731157,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"4-1\/2 in shaft (114.3 mm)","offer_id":50199364763925,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"5 in shaft (127 mm)","offer_id":50199364796693,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"5-1\/2 in shaft (139.7 mm)","offer_id":50199364829461,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"6 in shaft (152.4 mm)","offer_id":50199364862229,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"25 mm shaft (0.984 in)","offer_id":50199364894997,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"28 mm shaft (1.102 in)","offer_id":50199364927765,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"30 mm shaft (1.181 in)","offer_id":50199364960533,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"35 mm shaft (1.378 in)","offer_id":50199364993301,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"40 mm shaft (1.575 in)","offer_id":50199365026069,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"45 mm shaft (1.772 in)","offer_id":50199365058837,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"50 mm shaft (1.969 in)","offer_id":50199365091605,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"55 mm shaft (2.165 in)","offer_id":50199365124373,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"60 mm shaft (2.362 in)","offer_id":50199365157141,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.kentershackle.com\/products\/shaft-anodes","provider":"Kenter Shackles","version":"1.0","type":"link"}