CMP CMC07AL Limited Clearance Shaft Anode Aluminum 1-1/2 Inch

The CMP Martyr CMC07AL is a 1-1/2 inch aluminum limited clearance donut collar shaft anode engineered to provide reliable sacrificial cathodic protection for marine propeller shafts in salt and brackish water environments. As part of the Martyr brand — a flagship line from Canada Metal (Pacific) Ltd. (CMP Group) — this anode is designed for boats and vessels where limited shaft clearance prevents the use of a standard-profile anode.

Key Features:

• Aluminum alloy construction — ideal for use in salt and brackish water
• Low-profile "donut" collar design engineered specifically for limited clearance shaft installations
• Interlocking halves for tool-free underwater alignment and a secure 100% circular shaft contact fit
• Includes stainless steel Allen head bolt with lock washer and bolt retaining washer to prevent anode loss during installation
• Extra alloy material around the fastener area for extended anode service life
• Pressure die-cast and manufactured to US Military Alloy Specification MIL-DTL 24779C (SH) for aluminum anodes
• Produced under an ISO 9001 Quality Management System for consistent quality and performance
• Do not paint — anode must remain exposed to water to function

Martyr limited clearance shaft anodes protect propeller shafts, stern tubes, shaft brackets, rudders, and surrounding underwater hardware from galvanic corrosion. The CMC07AL is the aluminum alloy variant of the CMC-7 series (MPN: CMC07 for zinc). Aluminum anodes are the preferred choice for salt and brackish water and offer a longer service life compared to zinc anodes in many marine environments.