Martyr Anodes Aluminum Shaft Anode

Martyr Anodes aluminum shaft anodes are sacrificial marine anodes. They protect inboard propeller shafts and the metal parts near them from galvanic corrosion and stray-current corrosion. The aluminum alloy is intended for salt water and brackish water. These shaft collar anodes are also sold as prop shaft anodes or shaft zincs, though they are made of aluminum rather than zinc.

Key Features:

• High-purity aluminum alloy based on US Military Specification anode standards
• Two interlocking halves that align quickly and clamp around the shaft
• Full shaft contact with a 100% circular radius for good electrical contact
• Extra alloy around the fasteners for longer service life
• Stainless steel hardware with bolt retaining washers that stop screws from dropping off during underwater installation
• Can be installed without hauling the boat, so it is easy to replace

Aluminum anodes are not recommended for fresh water. Each anode corrodes in place of the shaft, so inspect it regularly and replace it once it has mostly eroded. Martyr has made sacrificial anodes for many years. Choose the shaft anode that matches your shaft's inside diameter and the clearance available at the mounting location.