Marine

Martyr CMX08 Zinc Shaft & Rudder Sacrificial Anode — 1-3/4"

4.9 9 reviews 1 min read

Martyr CMX08 Zinc Shaft & Rudder Sacrificial Anode — 1-3/4"

Product description

Protects underwater metalwork from galvanic corrosion by sacrificing itself to prevent pitting and metal loss on propellers, shafts, and hull fittings. Ideal for use in saltwater environments where zinc is the preferred material.

Constructed from marine-grade zinc, this anode is fabricated to offer stable, long-term corrosion protection. The CMX08 is sized for a 1-3/4" shaft and intended for use on propeller shafts and rudder posts and other submerged components.

The anode comes as a precision two-piece unit: two interlocking halves that clamp around the shaft to provide complete 360° electrical contact. This split design simplifies installation and improves the continuity needed for effective sacrificial protection.

Made under an ISO 9001 quality system, these anodes are produced to consistent specifications to ensure dependable replacement intervals and predictable performance in marine service.

Pros

  • Two-piece design for full shaft contact
  • Marine-grade zinc suited for saltwater
  • Manufactured to ISO 9001 quality standards

Cons

  • Zinc is not ideal for all freshwater situations
  • Limited to shafts of the specified diameter
  • Will require periodic replacement as it corrodes

VerdictA reliable zinc shaft and rudder anode that offers straightforward replacement and solid saltwater protection. Its split-body design gives full circumferential contact for better electrical continuity, making it a practical choice for routine maintenance on prop shafts and underwater fittings. Well-suited for owners seeking a proven, ISO 9001-made sacrificial anode with easy installation.

Reviews

  1. Karen M. DeLuca 5/5

    Dependable on my boats

    We installed these on several vessels and have been very satisfied. Delivery and support were excellent.

  2. Wally Fort 5/5

    Does the job

    Name fits the purpose. Works well when mounted on a boat shaft.

  3. theodore 5/5

    Holding up in saltwater

    Performs well. I'm using it in the Sea of Cortez.

  4. erbehr 5/5

    Perfect replacement — testing underway

    Ideal swap; fitted in August 2025 and has stayed in a wet berth with 23 minutes of engine use. Will post an update after a dive.

  5. David Williams 5/5

    Protects prop and shaft

    Doing a great job preserving the propeller and shaft from galvanic attack.

  6. Steve Cole 5/5

    Exactly what I needed

    Matches the specifications I was looking for and arrived in good condition.

  7. Matthew Brown 5/5

    Good fit and affordable

    Fits my 1" prop shaft correctly and was noticeably less costly than other suppliers I considered.

  8. Pmnt 5/5

    All arrived and installed

    Everything came as ordered; I installed all four. I had initial worries about delivery but felt reassured by the refund protections and am pleased with the purchase.

  9. Pete 4/5

    Fast delivery, simple install

    Arrived quickly and clamped onto my shaft with no trouble.

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