Commercial Zinc Propeller Nut Anode, 2"

The Martyr Propeller Nut Anode CMPN13Z is a precision-engineered sacrificial prop nut anode designed to defend your propeller shaft from galvanic corrosion by mounting directly on the prop nut and rotating with the shaft. This zinc alloy anode is ideal for saltwater environments and delivers superior corrosion protection for props, shafts and underwater drive systems.

Features

• Material: Zinc (for salt-water use)
• Size (Type A):
  • Interior Diameter (ID): ~ 2.00 in
  • Outside Diameter (OD): ~ 2.76 in
  • Height/Depth: ~ 2.83 in
• Weight: ~ 2.094 lb (~0.95 kg)
• Designed to mount on the propeller shaft at the prop nut, turning with the shaft to equalize potential and prevent isolated corrosion.

Why You Should Use It
When your prop shaft is electrically isolated from the rest of the vessel (which many are), standard hull anodes may not protect the propeller itself. The Martyr prop-nut anode engages at the shaft axis and rotates with the propeller, making it highly effective at transferring sacrificial protection right where it’s needed most.

By installing this anode, you’re helping to preserve critical components like the propeller, shaft, rudder and surrounding structures—avoiding costly damage from galvanic corrosion over time.

Applications include:

• Saltwater and mixed-environment vessels where the prop shaft remains partially isolated.
• Replacement or scheduled-service anode for shafts that use standard prop nut mounting.
• Commercial or pleasure craft where prop integrity and underwater metal protection are critical.