Martyr Zinc Skeg Trim Tab Anode Yamaha 225-300HP CMT-61A4537100Z
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The Martyr CMT-61A4537100Z is a zinc skeg / trim tab anode for select Yamaha outboards. It cross-references to Yamaha 61A-45371-00-00 and is designed to help protect the lower unit from galvanic corrosion in saltwater service.
Key Features
- Zinc sacrificial skeg / trim tab anode
- Martyr part number: CMT-61A4537100Z / CM61A4537100Z
- Cross-reference: Yamaha 61A-45371-00-00
- Designed for saltwater use
- Common size references: about 4 in. diameter with M10 x 1.25 mm thread pattern.
Engine Compatibility
Current fitment references support this anode for select Yamaha 225–250 HP applications, and broader current Yamaha/OEM-pattern references also associate the 61A-45371-00-00 pattern with models such as F225, F250, F300, plus older 225/250 applications.
Serial Number Fitment Notice
Fitment should be verified by engine model, serial number, and installed anode pattern before ordering. Matching by 61A-45371-00-00 / CMT-61A4537100Z remains the safest method.
When This Part Needs Replacement
Replace the anode when it is heavily consumed, pitted, cracked, loose, or significantly reduced in size. This is a zinc anode and is not recommended for freshwater use.
Installation Notes
Install on a clean bare-metal mounting surface and do not paint the anode. Always check propeller clearance after installing new trim tab anodes. Mounting bolt availability varies by listing, so hardware should be confirmed against the exact stocked item.
Alternate / Superseded Part Numbers when applicable
- CMT-61A4537100Z / CM61A4537100Z
- 61A-45371-00-00
- 22-3318
Parts Desk Insight
The important match point on this part is the 61A-45371-00-00 skeg / trim-tab pattern. On Yamaha lower units, this anode does double duty by fitting the skeg/trim-tab location while also protecting a much more expensive gearcase assembly.
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.