Martyr CMX25 Zinc Streamline Shaft Anode – 25mm Shaft | Stainless Allen Screw | Saltwater
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Martyr CMX25 Zinc Streamline Shaft Anode
Protect your 25mm prop shaft from galvanic corrosion with this precision-cast zinc streamline shaft anode. The CMX25 is the metric-dimensioned version of the 1" shaft anode series — designed for vessels with metric shaft sizing where a standard imperial anode won’t seat correctly. The low-drag, hydrodynamic profile minimizes water resistance while the stainless steel Allen head screw locks the anode firmly in place for the season.
Compatible Applications
- 25mm diameter prop shafts (metric)
- Saltwater use
- Inboard and inboard/outboard (I/O) vessels with metric shaft sizing
- European and metric-spec marine platforms
- Replaces OEM shaft anodes on standard 25mm shaft configurations
Specifications
- Part Number: CMX25
- SKU: 194-CMX25
- Material: Military-grade zinc alloy (sacrificial)
- Shaft Diameter: 25mm (metric)
- Fastener: Stainless steel Allen head screw
- Profile: Streamlined / hydrodynamic
- Best For: Saltwater
- Weight: ~150 g
Imperial Equivalent & Related Sizes
- CMX03 – 1" (25.4mm) Zinc Shaft Anode – imperial equivalent
- CMX03AL – 1" Aluminum Shaft Anode (saltwater & brackish)
- CMX03M – 1" Magnesium Shaft Anode (freshwater)
- CMT-X30 – 30mm Zinc Shaft Anode
- CMT-X25 – 25mm Zinc Shaft Anode (alternate style)
Parts Desk Insights
The CMX25 is the right call when you have a confirmed 25mm metric shaft and need a proper-fitting anode rather than forcing an imperial 1" anode onto a slightly undersized bore. The difference between 25mm and 1" (25.4mm) is small but matters for a secure, rattle-free fit — an anode that’s even slightly loose won’t make consistent electrical contact and will wear unevenly. If you’re unsure whether your shaft is metric or imperial, measure the shaft diameter with calipers before ordering. For saltwater and brackish water, consider the aluminum version; for freshwater, magnesium is the correct choice.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.