Name: Zinc Rudder Anode 1-7/8" CMT-R01
SKU: XUN180900598
Availability: InStock

Description
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The CMT-R01 is a 1-7/8″ round zinc rudder anode designed to protect rudders and trim tabs from galvanic corrosion. This two-piece pancake style anode clamps around the rudder or tab, sacrificing itself to prevent damage to critical underwater metals.

Manufactured from marine-grade zinc alloy, it is specifically engineered for saltwater environments, providing reliable and predictable corrosion protection.

Key Features

1-7/8″ diameter rudder/trim tab anode
Two-piece clamshell (button) design
Marine-grade zinc alloy construction
Includes stainless steel mounting hardware
Designed for saltwater use only
Direct OEM-style replacement

Application / Compatibility

Designed for:

Rudders
Trim tabs
Small underwater hardware requiring compact protection

Common on:

Inboard vessels
Sailboats
Smaller rudder systems

Also used where space is limited and a low-profile anode is required

Serial Number / Fitment Notice

Always confirm:

Diameter (1-7/8″)
Mounting style (through-bolt clamp design)
Clearance on rudder or trim tab

Correct sizing ensures proper clamping and effective corrosion protection.

When This Part Needs Replacement

Anode is 50% or more consumed
Uneven or rapid corrosion
Loose fit or hardware degradation
Routine haul-out or dive inspection

Installation Notes

Clamp both halves securely around rudder/tab
Ensure clean metal-to-metal contact
Do not paint the anode
Use supplied stainless hardware
Can be replaced underwater if accessible

Alternate / Cross-Reference Part Numbers

Camp Company: CMT-R01
Martyr: CMR01 / R01 / R-1
Common references: R1, CMR1, R1875Z
Aluminum version: CMT-R01AL
Magnesium version available for freshwater

Parts Desk Insight

These small rudder anodes are deceptively importantthey protect high-value steering components in a very concentrated area. If they disappear, corrosion goes straight into your rudder hardware fast.