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Martyr Anodes CM821630C2M Transom Plate Anode Magnesium for MerCruiser Bravo

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

CM821630C2M
06/03/2036 9:36 AM
Sale Price

$15.67

In Stock (5)

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Usually delivered within 2 days

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Product Details

The Martyr Anodes CM821630C2M is a premium magnesium transom plate anode designed specifically for Mercury MerCruiser Bravo stern drive systems. This sacrificial anode provides essential corrosion protection for your outdrive in freshwater environments, safeguarding the driveshaft housing and transom assembly from galvanic corrosion.

Key Features:

  • Magnesium alloy construction for optimal freshwater protection
  • Direct replacement for Mercury OEM part numbers 821630C2 and 821630Q1
  • Fits MerCruiser Bravo I, II, III, X, XR, and XZ outdrives
  • Meets or exceeds MIL-A-18001 military specification standards
  • Precision-engineered for exact fit on Gen II transom plate applications
  • Erodes inward for easy visual inspection and monitoring

Specifications:

  • Length: 7.5 inches (191mm)
  • Width: 2.875 inches (73mm)
  • Thickness: 0.635 inches (16mm)
  • Mounting hole diameter: 3.25 inches (83mm)
  • Thread: 1/4-20 UNC
  • Weight: Approximately 1.7 lbs

Important: Magnesium anodes are designed exclusively for freshwater use and will dissolve too rapidly in saltwater or brackish water environments. For saltwater applications, use aluminum or zinc anodes. Always check propeller clearance after installing new transom plate anodes to ensure proper fit and safe operation.

Martyr Anodes manufactures premium quality sacrificial anodes using mil-spec alloys that provide superior corrosion protection for marine stern drives. Regular inspection and replacement of anodes when they reach 70% erosion helps extend the life of your expensive outdrive components.

Good prices and very good delivery timesAAAAAAAAAAAAAAAAA

Had the part i was looking for.

very easy to shop Thank You

Good order experience although I received one confusing email from Autoplicity and had to call them to get it straight. Shipping was a little slower than I would have liked.

Easy shopping

It was a easy transaction and shipping was pretty fast. Very happy with this company, and will order again!!! ( actually already have)

WAS QUICK AND EASY

Liked the amazon pay

So far autoplicity has been a great shopping experience.

thanks

They had two items that I wanted in stock with the lowest price I've seen online anywhere, and had super affordable shipping options.

Pictures are clear, price is reasonable and the check out was fast and easy.

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