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Martyr Anodes CM31640M Aluminum Trim Tab Anode for Mercury MerCruiser

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

CM31640M
06/03/2036 9:38 AM
Sale Price

$11.10

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 CM31640M is a direct replacement aluminum anode designed specifically for Mercury MerCruiser sterndrives. This trim tab anode provides critical corrosion protection for your sterndrive's lower unit by sacrificing itself to prevent galvanic corrosion of more expensive metal components.

Key Features:

  • Manufactured from high-quality aluminum alloy for optimal protection in saltwater and brackish environments
  • Direct OEM replacement for Mercury part number 31640
  • Designed to mount on the trim tab assembly of MerCruiser drives
  • Easy installation with existing mounting hardware
  • Meets or exceeds military specification MIL-A-24779 (SH)

Regular inspection and replacement of sacrificial anodes is essential for protecting your sterndrive investment. Replace anodes when they are 50% depleted or show signs of heavy corrosion. Always verify proper propeller clearance after installing new trim tab anodes to ensure safe operation.

Products specifications

Description

Standard Trim Tab, Fits GEN. II

Material

Magnesium

Placed order on Sunday and received shipment on Thursday. Haven't installed items yet but boxes are in good shape. I'm satisfied with the transaction.

Nice

Great Purchase.

These guys had great pricing and got my order to me very quickly. I would do business with them again for sure!

autoplicity is a great on line shopping experience . with low prices and fast shipping, you will be pleased. i really like there way of doing business.

Nice

good price, I need quick

Excellent prices. Delivery was fast. Great site to order parts from.

good price and they have a lot of choices

The web site makes it very easy tt find what your looking for and the prices are very good as well,.. Lower than anyone else on the net! I recieved my order in just two days! Super fast shipping! I will be back again when my truck asks for more goodies!!

I am impressed with they mail order service. Recommended.

Autoplicity has hands down the best prices on aftermarket parts I have seen, which was a big motivator to order through them. They were very prompt in getting my order shipped. Must say I am pretty impressed.

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