CMP CMC03 Limited Clearance Zinc Shaft Collar Anode 1 Inch

The CMP CMC03 is a limited clearance zinc collar shaft anode — commonly referred to as a "doughnut" anode — designed to provide sacrificial galvanic corrosion protection for 1-inch propeller shafts in saltwater environments. Its low-profile design makes it ideal for installations where standard shaft anodes won't fit due to tight clearance restrictions near struts or bearings.

Key Features:

• Shaft Size: Fits 1-inch (25mm) diameter propeller shafts
• Outside Diameter (OD): 2-1/2 inches (63mm)
• Inside Diameter (ID): 1-1/4 inches (32mm)
• Height/Length: 1-1/4 inches (32mm)
• Material: Zinc alloy — formulated for saltwater use only
• Hardware: Stainless steel Allen head bolt with bolt-retaining washers for secure mounting and easy underwater installation
• Alloy Standard: Manufactured to meet or exceed US Military Specification MIL-A-18001K

Zinc anodes are recommended for saltwater use only and are not suitable for fresh water or brackish water applications. The included bolt retainer washers prevent the anode from falling off the shaft during handling or underwater installation, making servicing straightforward even when hauling is not possible.