Martyr CMR04AL Boat Anode Pair Aluminum 5in Ball Bearing

Description

Product Overview

The Martyr CMR04AL boat anode pair is designed for serious sailors who demand reliable, long‑lasting corrosion protection. Each anode is forged from high‑purity aluminum alloy, eliminating iron impurities that can accelerate galvanic wear. Integrated CMR04AL ball bearings ensure smooth electrical flow and reduce wear on the anode surface. With an outside diameter of 5 inches, a height of .65‑.87 inches and a wall thickness of .34‑.37 inches, the units fit standard rudder posts and other marine hardware. The package includes two anodes and stainless‑steel mounting bolts, ready for immediate installation.

Usage

These anodes are ideal for sailboats, motorboats, and any vessel with exposed metal fittings in saltwater environments. Install one pair on each side of the rudder or on the keel to create a sacrificial barrier that attracts corrosive elements away from critical components. The design works equally well on fresh‑water boats, offering consistent protection regardless of water chemistry. Because the anodes are cadmium‑free, they meet strict environmental regulations for protected waterways and marine parks.

Why Choose Us

Martyr’s reputation for marine hardware stems from decades of engineering expertise and rigorous ISO testing. Each CMR04AL anode undergoes a 2‑year EU spare‑part guarantee, reflecting confidence in durability and performance. The alloy composition is carefully balanced to provide a steady sacrificial reaction, extending service life by roughly half compared with traditional zinc anodes. Additionally, the inclusion of precision ball bearings reduces the risk of uneven wear, ensuring a uniform protective layer throughout the anode’s lifespan.

Key Features

• Pure aluminum alloy eliminates iron contaminants for consistent protection
• Integrated ball bearing design improves electrical flow and reduces wear
• Lasts up to 50% longer than standard zinc anodes, lowering replacement frequency
• Cadmium‑free formulation meets environmental standards for protected waters
• Includes stainless‑steel mounting bolts and a 2‑year EU spare‑part guarantee

FAQ

How often should I replace the Martyr CMR04AL anodes?

Replacement intervals depend on water conditions, but most sailors find the anodes last 2‑3 years in saltwater, significantly longer than traditional zinc options.

Can I use these anodes on a freshwater boat?

Yes, the aluminum alloy works effectively in both salt and fresh water, providing reliable sacrificial protection in any environment.

What size wrench is needed to install the stainless steel bolts?

The bolts are standard 1/4‑inch hex, compatible with most marine tool sets.

Are the anodes compatible with all rudder sizes?

The 5‑inch diameter fits the majority of standard rudders and keel fittings. For larger hardware, consult Martyr’s sizing guide.

Is there a warranty if the anode fails prematurely?

Martyr offers a 2‑year EU spare‑part warranty covering manufacturing defects. Contact customer support with proof of purchase for a replacement.