Description

The MDX-5 is a zinc shaft anode designed for 1-1/4″ propeller shafts, providing essential sacrificial protection for inboard running gear. Installed directly on the shaft, it corrodes first—protecting shafts, propellers, and nearby underwater metals from galvanic corrosion.

Constructed from marine-grade zinc alloy, it is specifically intended for saltwater environments, where zinc delivers stable and reliable corrosion protection.

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Key Features

• Fits 1-1/4″ shaft diameter
• Marine-grade high-purity zinc alloy
• Two-piece clamp-on design
• Provides 360° shaft protection
• Designed for saltwater use
• Easy installation and replacement

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Application / Compatibility

Designed for:

• 1-1/4″ propeller shafts
• Inboard propulsion systems
• Shaft-driven vessels

Common on:

• Cruisers
• Sailboats
• Sportfish and workboats

Protects:

• Propeller shafts
• Struts
• Prop hubs and surrounding metals

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Serial Number Fitment Notice

Always confirm:

• Shaft diameter (1-1/4″)
• Clearance between shaft and strut
• Proper anode length and OD

Correct sizing ensures proper clamping and electrical contact.

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When This Part Needs Replacement

• Anode is 50% or more consumed
• Loose fit on shaft
• Uneven or rapid wear
• Routine haul-out inspection

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Installation Notes

• Install on clean, bare shaft surface
• Tighten evenly for full contact
• Do not paint the anode
• Position clear of strut and propeller
• Recheck tightness after initial run

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Alternate / Cross-Reference Part Numbers

• MDX-5 (aftermarket reference)
• Martyr equivalent available
• Aluminum version available for mixed water
• Magnesium version available for freshwater

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Parts Desk Insight

Shaft anodes like the MDX-5 are your first line of defense for running gear. If they’re wearing quickly, it usually means they’re doing their job—but it can also indicate stray current issues worth checking.

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Shipping

Shipping: Ships same or next day for fast Canada wide shipping.