Zinc Hull Plate Anode 6-1/4" x 2-3/4" CMT-ZHC3AZ
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You have 30 days to request a return. All sale items are final sale.
The CMT-ZHC3AZ (Martyr CMZHC3AZ) is a bolt-on zinc hull plate anode designed to protect underwater hull surfaces from galvanic corrosion. Installed directly to the hull, it acts as a sacrificial metal—corroding first to preserve critical structural components.
Its streamlined rectangular design minimizes drag while maximizing exposed surface area for effective corrosion protection.
Key Features
- Marine-grade zinc construction (saltwater optimized)
- Streamlined plate design reduces drag
- Bolt-on installation (no welding required)
- High-purity zinc for consistent protection
- Durable cast construction for long service life
Specifications
- Length: 6-1/4"
- Width: 2-3/4"
- Thickness: ~3/4"
- Hole spacing: approx. 2-1/4" – 2-3/4" centers
- Weight: ~2.0 lbs
Application
Used for:
- Boat hull protection (below waterline)
- Transoms and underwater metal surfaces
- Commercial and recreational vessels
✔ Common on:
- Fiberglass boats with bonded metals
- Aluminum hulls (with proper bonding system)
- Steel hull applications
Serial Number / Fitment Notice
Always confirm:
- Mounting hole spacing
- Hull material compatibility
- Required anode size based on vessel size
When This Part Needs Replacement
- Anode is 50% consumed or more
- Uneven or accelerated corrosion
- Annual inspection / haul-out
- Loss of protective mass
Installation Notes
- Bolt directly to clean, bare metal surface
- Ensure solid electrical contact
- Do not paint anode
- Use proper backing plates if required
- Install multiple units for larger vessels
Alternate / Cross-Reference Part Numbers
- Martyr: CMZHC3AZ
- Common reference: ZHC-3
- Aluminum version: CMZHC3AA
- Magnesium version: CMZHC3AM
Parts Desk Insight
Hull plate anodes like this are your primary line of defense against galvanic corrosion on larger surfaces. Proper sizing and placement is critical—too small and they won’t protect effectively, too few and corrosion will find weak points quickly.
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.