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Martyr Anodes CMR04M Magnesium Rudder/Trim Tab Anode with Stainless Steel Allen Head Screw

Manufacturer

Martyr Anodes

<h3>About Martyr Anodes</h3><p>When it comes to defending a vessel against galvanic corrosion, few names carry the authority of <strong>Martyr Anodes</strong>. A flagship brand within the <strong>CMP Group</strong>, Martyr has its roots in foundry operations that date back to the early 1900s in Vancouver, BC, growing from a local manufacturer into a globally recognized leader in marine cathodic protection. Today, the brand supplies boaters, commercial operators, and marine professionals worldwide with sacrificial anodes engineered to guard hulls, propellers, rudders, shafts, engines, and other submerged components from the relentless effects of corrosion.</p><h3>Three Alloys, Every Water Type</h3><p>What sets Martyr apart from competing anode manufacturers is its position as the only brand to offer all three protective alloys — zinc, aluminum, and magnesium — under a single product line. This matters because the correct alloy depends entirely on the water environment a vessel operates in. Zinc anodes are the classic choice for aggressive saltwater conditions, while aluminum anodes are preferred for saltwater and brackish environments, offering superior corrosion resistance with a reduced environmental footprint. Magnesium anodes are the go-to solution for freshwater use, delivering effective sacrificial protection without degrading too quickly. Whatever the operating environment, Martyr has an engineered solution to match.</p><h3>Military-Grade Manufacturing Standards</h3><p>Martyr does not cut corners on metallurgy. Every anode is pressure die-cast and manufactured to meet or exceed <strong>U.S. Military alloy specifications</strong>, using only high-purity metals. Each alloy batch is lab-tested with full certification and traceability available upon request. This rigorous quality management — operating under an ISO 9001 framework — ensures that each anode delivers consistent, long-lasting galvanic performance across a wide range of marine environments, from recreational pleasure craft to commercial vessels and naval applications.</p><h3>Anode Kits for Simplified Protection</h3><p>For boaters who want a complete, hassle-free maintenance solution, Martyr&rsquo;s <a href="/7452-martyr-anodes-anode-kits-200102">Anode Kits</a> offer pre-packaged sets engineered for specific engine models and boat types. Compatible with major marine engine brands including Yamaha, Mercury, Volvo, and MerCruiser, these kits take the guesswork out of corrosion protection and ensure every critical system receives optimal coverage in a single purchase.</p><h3>Sustainability at the Core</h3><p>Martyr and the CMP Group have made environmental stewardship a cornerstone of their mission. Traditional zinc anodes can contain cadmium, a metal that poses risks to aquatic ecosystems. Martyr actively advocates for the adoption of aluminum and magnesium alternatives that deliver equal or superior protection while minimizing harm to marine environments — embodying the brand&rsquo;s philosophy of &ldquo;Protect your boat, protect our waters.&rdquo; With over 1,000 anode types available and a catalog that fits virtually every major marine engine and boat model, Martyr remains one of the most comprehensive and trusted sources for marine corrosion protection in the world.</p>

Part Number

CMR04M
06/03/2036 5:45 AM
Sale Price

$34.40

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Martyr Anodes CMR04M is a precision-engineered magnesium sacrificial anode designed specifically for rudders and trim tabs on marine vessels. This anode provides superior cathodic protection against galvanic corrosion in freshwater and brackish water environments.

Key Features:

  • High-purity magnesium alloy construction for maximum corrosion protection
  • Includes stainless steel Allen head screw for secure installation
  • Pre-drilled mounting hole for easy attachment to rudders and trim tabs
  • Designed to corrode preferentially, protecting valuable underwater metal components
  • Compact profile minimizes drag while providing effective protection

Martyr Anodes are manufactured to strict quality standards and are among the most trusted sacrificial anodes in the marine industry. Regular inspection and replacement of sacrificial anodes is essential for protecting your vessel's underwater metals from costly corrosion damage.

Suprised how quickly the item ordered arrived. Thank you.

Good Products, and good service.

Great first time experience

Very pleased with timely delivery and product.

It was ok

I was satisfied with customer service and response and overall friendliness

Awesome deal and fast shipping. Will be back!

Very quick and easy. Thanks

hard to find part

Great information on website and easy to order.

The best price I could find and it arrived in 2 days! I'll be back for more.

easy to use and easy to pay

I hope the product is as good as the speed I received the item. I even made a mistake on my order, and it still arrived fast. Thanx, will do business with again.

Great and user friendly.

Smooth transaction & fast service...

Awesome!! Thanks very much

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