Zinc Shaft Anode MDX-7 1-1/2"
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The MDX-7 is a sacrificial zinc shaft-style anode designed to protect outboard and inboard drivetrain components from galvanic corrosion. Installed on the shaft or running gear, it corrodes first—preserving critical metal components like shafts, propellers, and brackets.
Manufactured from marine-grade zinc alloy, it is specifically suited for saltwater environments, where zinc provides stable and predictable corrosion protection.
Key Features
- MDX-7 shaft-style zinc anode
- Designed for 1-1/2" shaft applications
- Marine-grade zinc alloy construction
- Protects shafts, propellers, and underwater metals
- Two-piece clamp-style design (typical configuration)
- Reliable performance in saltwater use
Application / Compatibility
Designed for:
- 1-1/2" propeller shafts
- Inboard and some outboard drivetrain setups
- Shaft-driven vessels
âś” Common on:
- Inboard boats
- Sailboats
- Commercial and recreational vessels
âś” Protects:
- Shafts
- Struts
- Prop hubs and nearby hardware
Serial Number / Fitment Notice
Always confirm:
- Shaft diameter (1-1/2")
- Clearance for installation
- Correct MDX series sizing
Correct sizing is critical for proper clamping and corrosion protection.
When This Part Needs Replacement
- Anode is 50% or more consumed
- Loose fit on shaft
- Uneven or accelerated wear
- Routine haul-out inspection
Installation Notes
- Install tightly around clean shaft surface
- Ensure full metal-to-metal contact
- Do not paint the anode
- Position away from bearings and prop for clearance
- Recheck tightness after initial run
Alternate / Cross-Reference Part Numbers
- MDX-7 (Reliance / aftermarket reference)
- Comparable Martyr shaft anode sizes available
- Aluminum equivalent available for mixed water use
Parts Desk Insight
Shaft anodes like the MDX-7 are your primary defense for running gear. If these are wearing quickly, it’s usually a sign the system is working—not failing—but it’s worth checking bonding and stray current if wear is excessive.
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. âš“
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.