Zinc Rudder Anode 5-1/8" CMT-R05
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The CMT-R05 is a 5-1/8" zinc rudder anode (R-5 style) designed to protect rudders and trim tabs from galvanic corrosion in saltwater environments. This two-piece “pancake” style anode clamps securely around the rudder surface, sacrificing itself to prevent damage to critical underwater metals.
Manufactured from high-purity zinc alloy, it delivers reliable and consistent corrosion protection for marine applications.
Key Features
- 5-1/8" diameter rudder/trim tab anode
- Two-piece clamshell design with stainless hardware
- Marine-grade zinc (saltwater optimized)
- Full surface contact for effective protection
- Easy bolt-on installation
- Meets or exceeds MIL-spec standards
Application / Compatibility
Designed for:
- Rudders
- Trim tabs
- Other flat underwater surfaces
✔ Common on:
- Inboard boats
- Cruisers and sportfish vessels
- Sailboats with rudder systems
✔ Protects:
- Rudder plates
- Trim tabs
- Adjacent bonded underwater metals
Serial Number Fitment Notice
Always confirm:
- Diameter (5-1/8")
- Thickness (~7/8")
- Mounting hole size and spacing
Proper fit ensures full contact and effective corrosion protection.
When This Part Needs Replacement
- Anode is 50% or more consumed
- Uneven wear or pitting
- Loss of structural thickness
- Routine haul-out inspection
Installation Notes
- Mount to clean, bare metal surface
- Tighten evenly across both halves
- Do not paint the anode
- Inspect hardware for corrosion
- Replace before full depletion
Alternate / Superseded Part Numbers
- Camp Company: CMT-R05
- Martyr: CMR05
- Common references: R-5, R5
- Aluminum version available for brackish water
- Magnesium version available for freshwater
Parts Desk Insight
The R-5 size is one of the most common rudder anodes. If customers see uneven wear, it often means poor bonding or electrical imbalance—not just normal consumption.
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.