Martyr Aluminum Prop Anode Side-Power 31180 CMT-SGSP31180A
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Martyr CMT-SGSP31180A is an aluminum replacement anode for Side-Power / Sleipner thruster applications using the 31180-style prop anode. It is designed to help protect the thruster gear leg and nearby underwater metal components from galvanic corrosion in saltwater, brackish, and mixed-water use. Published dimensions are approximately 25–26 mm outside diameter, 15 mm height, and 6 mm internal diameter.
Aluminum anodes are a strong choice for many boaters because they provide broad-environment protection and long service life. This anode is commonly referenced as a replacement for Side-Power / Sleipner 31180 / 31180A and is used on select 125 mm tunnel thruster applications.
Key Features
- Aluminum sacrificial prop/thruster anode
- Fits Side-Power / Sleipner 31180-style applications
- Intended for saltwater, brackish, and mixed-water environments
- Approx. dimensions: 25–26 mm OD x 15 mm height x 6 mm ID
- Helps reduce corrosion on thruster metal components
- Common replacement references include 31180 / 31180A / 01054AL
Application / Compatibility
Commonly listed for Side-Power / Sleipner thruster applications including select 125 mm tunnel thrusters and models such as SP30S, SP35S, SP40S, SE25, SE30, SE40, SEP40, and SE50S in some supplier fitment charts. Fitment references vary by seller, so this should be treated as a guide and confirmed against your exact thruster model and current anode dimensions before ordering.
Serial Number Fitment Notice
Please confirm fitment using your Side-Power / Sleipner thruster model, existing anode dimensions, and OEM part reference before ordering. If your thruster uses a different anode shape, diameter, or fastening style, this may not be the correct part.
When This Part Needs Replacement
Replace this anode when it is significantly wasted, pitted, reduced in size, or no longer making proper protective contact. Thruster anodes should be checked regularly during haul-out or routine underwater gear inspections, especially in saltwater and marinas with higher stray-current risk.
Installation Notes
Remove the remains of the old anode, clean the mounting surface, and install the new anode so it seats correctly and makes solid contact. Do not paint the anode. Confirm the mounting size and hardware style match your existing setup before installation. Some listings indicate a mounting screw may be included on comparable 31180A versions, but hardware inclusion can vary by supplier listing, so verify what is included with your exact part source.
Alternate / Superseded Part Numbers
- 31180
- 31180A
- 01054AL
Parts Desk Insight
This is a small part that protects a much more expensive thruster assembly. If your current Side-Power prop anode is thinning out or heavily consumed, replacing it on time helps avoid corrosion damage to the thruster leg and related underwater metals. Aluminum is the right material choice here for boaters running in salt, brackish, or mixed-water conditions.
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.