CMP CMX04 Zinc Streamlined Shaft Anode 1-1/8" for Saltwater

The CMP CMX04 is a zinc sacrificial shaft anode engineered to protect propeller shafts and rudders from galvanic corrosion in saltwater environments. Zinc is the proven alloy of choice for saltwater applications, offering reliable cathodic protection that sacrifices itself to preserve your vessel's valuable underwater metal components.

This streamlined, barrel-style anode features a two-piece interlocking design that clamps directly around a 1-1/8 inch diameter shaft and includes stainless steel hardware for secure fastening. The 100% circular inner radius ensures full, even shaft contact, maximizing protective coverage and extending service life. Extra alloy material around the fastener area helps prevent erosive separation, keeping the anode securely in place even in demanding conditions.

Key Features:

• Material: High-purity zinc alloy — for use in saltwater only
• Inner Diameter: 1-1/8 inch (fits 1-1/8" propeller shafts)
• Outer Diameter: 2.36 inches
• Height: 2-1/4 inches
• Two-piece interlocking halves for secure, gap-free shaft fit
• 100% circular inner radius for full shaft contact and maximum protection
• Extra alloy around fasteners to resist erosive separation
• Includes stainless steel hardware (bolts and lock washers)
• Can be installed or replaced underwater

Also known by cross-reference part numbers including X-4, X4, CMX04Z, and MDX-4. The CMX04 is a direct-fit replacement for compatible OEM shaft anodes on this shaft diameter. Replace when anode is approximately 50% consumed to maintain continuous corrosion protection.