Zinc Shaft Collar Anode 7/8" ID x 1" x 2-1/8" – CMT-C02
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Martyr CMT-C02 is a zinc limited-clearance shaft collar anode designed for 7/8" propeller shafts. This split collar shaft anode helps protect propeller shafts and nearby running gear from galvanic corrosion in saltwater service. It is commonly listed with a 7/8" inside diameter, 2-1/8" outside diameter, and 1" length. Zinc is intended for saltwater use only.
Key Features
- Zinc limited-clearance shaft collar anode
- Fits 7/8" shaft size
- Approximate dimensions: 7/8" ID x 2-1/8" OD x 1" length
- Split collar design for shaft installation
- Commonly listed with Allen screw fastening hardware
- Designed for propeller shaft and running gear corrosion protection
Engine Compatibility
This is not an engine-specific anode. It is a shaft-size-based replacement part for vessels using a 7/8" propeller shaft and the matching limited-clearance collar anode format. Fitment should be confirmed by shaft diameter, anode outside diameter, available clearance around the shaft, and the installed collar style before ordering.
Serial Number Fitment Notice
Fitment should be confirmed by shaft size and anode dimensions rather than engine serial number alone. Match the existing anode by 7/8" inside diameter, 2-1/8" outside diameter, 1" length, and split-collar configuration before purchase.
When This Part Needs Replacement
Replace when the zinc is heavily wasted, cracked, loose, or no longer maintaining proper protective mass on the shaft. Shaft anodes should be inspected regularly and replaced before they are fully consumed so the shaft and nearby running gear remain protected.
Installation Notes
Install only on applications that call for a 7/8" limited-clearance shaft anode. This split collar style is designed for easy installation, including underwater replacement in suitable service conditions, and some listings note retaining washers to help keep the halves in place during installation. Confirm full contact on the shaft and adequate clearance around the rotating assembly after installation. Zinc is for saltwater use and is not recommended for freshwater service.
Alternate / Superseded Part Numbers
- CMC02
- CMT-C02
- 194-CMC02
- 22-3180
- Sea Shield LC-0875
- Electro Guard LC-0875
- Reliance MDC-2
Parts Desk Insight
This is a limited-clearance shaft anode, which matters when space around the shaft is tight. On these collar anodes, the safest match is the shaft diameter first, then the outside diameter and overall length, because a wrong outside diameter can create clearance problems even when the shaft size looks correct.
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
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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.
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