Martyr Anodes CM55989A Aluminum Nut Anode for Mercury Mercruiser Alpha Bravo Sterndrive

The Martyr CM55989A is a premium aluminum sacrificial anode designed specifically for Mercury and Mercruiser stern drives. This hexagonal nut-style anode provides critical corrosion protection for aluminum stern drive components by sacrificing itself to prevent galvanic corrosion damage to the outdrive housing and internal components.

Key Features:

• Hexagonal design (1-1/4" hex) for easy installation and removal with standard tools
• Aluminum alloy construction ideal for brackish water and saltwater applications
• Manufactured to meet or exceed U.S. Military specifications for marine anodes
• Mounts to Alpha One gimbal housing mounting bolts or transom plate
• Replaces Mercury OEM part numbers 55989A3, 55989A4, 55989A9, 55989Q9, 55989T9

Compatibility: For use with MerCruiser MC-I, R, MR, Alpha One (including Gen I and Gen II), and Bravo I, II, III stern drive outdrives. Commonly used on 1983-1990 Alpha One drives and later models. Typically sold in pairs for complete gimbal housing protection.

Specifications:

• Dimensions: 1-1/4" hex x 1-5/16" height
• Mounting hole: 1/2" NC thread
• Weight: Approximately 0.26-0.30 lbs
• Material: Aluminum alloy

Installation Note: Always check propeller clearance after installing new trim tab or gimbal anodes to ensure the anode does not interfere with propeller function. Inspect anodes periodically and replace when showing signs of corrosion, pitting, or when more than 50% depleted.

Part of the comprehensive Martyr Anodes line from Canada Metal (Pacific) Ltd., recognized worldwide as premium marine corrosion protection products. Martyr anodes are chemically tested for consistency and proven to deliver exceptional efficiency in protecting your valuable marine investment.