Zinc Shaft Anode 4″ CMT-X17

The CMT-X17 is a marine-grade zinc clamp-on shaft anode sized for 4″ diameter propeller shafts, providing heavy-duty sacrificial cathodic protection for propeller shafts, shaft couplings, and associated underwater hardware on larger vessels in saltwater environments.

Key Features

• High-purity zinc alloy proven saltwater corrosion protection
• 4″ bore designed for large-diameter propeller shafts
• Clamp-on design no shaft modification required
• Protects shaft, coupling, and adjacent underwater metals
• Heavy-duty construction for commercial and large recreational vessels
• Split design for easy installation without removing shaft

Application / Compatibility

Designed for:

• Vessels with 4″ diameter propeller shafts
• Inboard diesel and gasoline powered vessels
• Commercial, workboat, and large recreational applications

Protects:

• Propeller shaft
• Shaft coupling and keyway
• Cutlass bearing housing
• Adjacent bonded underwater metals

Serial Number Fitment Notice

• Confirm shaft diameter: 4″ (101.6mm)
• Verify clamp bore fits shaft without excessive play
• Check anode length and mass is appropriate for vessel size

When This Part Needs Replacement

• Anode is 50% or more consumed
• Uneven or accelerated wear
• Visible corrosion on shaft or coupling
• Annual haul-out or seasonal service

Installation Notes

• Clean shaft surface thoroughly before installation
• Ensure bare metal-to-metal contact no paint or coatings under anode
• Tighten clamp bolts evenly and securely
• Do not paint the anode surface
• Position anode away from propeller to avoid interference
• Inspect bonding system if uneven wear occurs

Alternate / Cross-Reference Part Numbers

• Camp Company: CMT-X17
• Martyr: CMX17
• Aluminum equivalent available for brackish/mixed water: CMT-X17A
• Magnesium version available for freshwater

Parts Desk Insight

A 4″ shaft anode is a serious piece of hardware typically found on larger inboard vessels, commercial boats, and workboats. At this shaft size, proper anode mass is critical: undersized anodes deplete quickly and leave the shaft unprotected between haul-outs. Replace on schedule and inspect the bonding system annually.

Shipping

Ships in 13 business days for fast Canada wide shipping.