{"product_id":"martyr-cmx04m-magnesium-streamline-shaft-anode-1-1-8in-194-cmx04m","title":"Martyr CMX04M Magnesium Streamline Shaft Anode – 1-1\/8\" Shaft | Stainless Allen Screw | Freshwater","description":"\u003ch2\u003eMartyr CMX04M Magnesium Streamline Shaft Anode\u003c\/h2\u003e\n\u003cp\u003eThe correct sacrificial shaft anode for 1-1\/8\" prop shafts in freshwater. Magnesium has a more active electrochemical potential than zinc or aluminum, making it the only alloy that provides effective galvanic protection in freshwater — where low water conductivity renders zinc and aluminum anodes essentially inactive.\u003c\/p\u003e\n\u003cp\u003eThe streamlined, hydrodynamic profile keeps drag to a minimum, and the stainless steel Allen head screw holds the anode securely in place all season without rattling or spinning.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1-1\/8\" (29mm) diameter prop shafts\u003c\/li\u003e\n\u003cli\u003eFreshwater use only (lakes, rivers, reservoirs)\u003c\/li\u003e\n\u003cli\u003eInboard and inboard\/outboard (I\/O) vessels\u003c\/li\u003e\n\u003cli\u003eReplaces OEM shaft anodes on most standard 1-1\/8\" shaft configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CMX04M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 194-CMX04M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Magnesium alloy (sacrificial)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Diameter:\u003c\/strong\u003e 1-1\/8\" (29mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener:\u003c\/strong\u003e Stainless steel Allen head screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfile:\u003c\/strong\u003e Streamlined \/ hydrodynamic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Freshwater only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e ~130 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAlso Available In\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/martyr-cmx04-zinc-streamline-shaft-anode-1-1-8in-194-cmx04\"\u003eCMX04 – 1-1\/8\" Zinc\u003c\/a\u003e (saltwater)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/martyr-cmx04al-aluminum-streamline-shaft-anode-1-1-8in-194-cmx04al\"\u003eCMX04AL – 1-1\/8\" Aluminum\u003c\/a\u003e (saltwater \u0026amp; brackish)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdjacent Sizes – Magnesium\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/cmx03m-1-shaft-anode-magnesium-194-cmx03m\"\u003eCMX03M – 1\" Magnesium Shaft Anode\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/martyr-cmx05m-streamlined-shaft-anode-with-stainless-steel-allen-head-magnesium-194-cmx05m\"\u003eCMX05M – 1-1\/4\" Magnesium Shaft Anode\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/martyr-cmx06m-streamlined-shaft-anode-with-stainless-steel-allen-head-magnesium-194-cmx06m\"\u003eCMX06M – 1-3\/8\" Magnesium Shaft Anode\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe CMX04M is the right anode for any 1-1\/8\" shaft running in freshwater. Zinc and aluminum anodes simply don’t work in freshwater — they passivate and stop sacrificing, leaving your shaft, cutlass bearing, and running gear unprotected. Magnesium is the only alloy with enough electrochemical activity to do the job in low-conductivity water.\u003c\/p\u003e\n\u003cp\u003eThe most common mistake is installing a zinc anode on a freshwater boat because it’s what was already there — if you’re seeing corrosion on a freshwater vessel that has zinc anodes, switching to magnesium is usually the fix. For saltwater or brackish water, see the \u003ca href=\"\/products\/martyr-cmx04al-aluminum-streamline-shaft-anode-1-1-8in-194-cmx04al\"\u003eCMX04AL aluminum version\u003c\/a\u003e or the \u003ca href=\"\/products\/martyr-cmx04-zinc-streamline-shaft-anode-1-1-8in-194-cmx04\"\u003eCMX04 zinc version\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":50999089332260,"sku":"194-CMX04M","price":27.69,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/194-CMX03_0192884f-f936-4728-807f-b0cd0afd3a5f.jpg?v=1782799286","url":"https:\/\/marisolmarine.com\/products\/martyr-cmx04m-magnesium-streamline-shaft-anode-1-1-8in-194-cmx04m","provider":"Marisol Marine Company","version":"1.0","type":"link"}