---
product_id: 90981032
title: "Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw, silver"
brand: "martyr"
price: "$34.07"
currency: USD
in_stock: true
reviews_count: 13
category: "Martyr"
url: https://www.desertcart.us/products/90981032-martyr-cmr03al-aluminum-rudder-trim-tab-anode-with-allen-screw
store_origin: US
region: United States of America
---

# Optimized for brackish water corrosion Includes stainless steel Allen screw hardware 50% longer life aluminum anode Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw, silver

**Brand:** martyr
**Price:** $34.07
**Availability:** ✅ In Stock

## Summary

> 🛥️ Sail Smooth, Stay Protected – The Ultimate Aluminum Anode Upgrade!

## Quick Answers

- **What is this?** Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw, silver by martyr
- **How much does it cost?** $34.07 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/90981032-martyr-cmr03al-aluminum-rudder-trim-tab-anode-with-allen-screw)

## Best For

- martyr enthusiasts

## Why This Product

- Trusted martyr brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Balanced Pair:** Sold as a pair with stainless steel bolts for secure, even protection on rudder and trim tabs.
- • **Trusted Quality Assurance:** ISO 9001 certified manufacturing ensures consistent, reliable corrosion protection every time.
- • **Eco-Friendly & Lightweight:** Cadmium-free aluminum reduces environmental impact and helps improve fuel efficiency.
- • **Versatile Brackish Water Defense:** Engineered to resist corrosion in varying salinity, perfect for diverse marine environments.
- • **Extended Protection, Less Replacement:** Aluminum anodes last up to 50% longer than zinc, cutting maintenance time and costs.

## Overview

Martyr CMR03AL Aluminum Rudder/Trim Tab Anode offers superior corrosion protection with up to 50% longer lifespan than traditional zinc anodes. Designed specifically for brackish water environments, it includes a complete pair with stainless steel Allen screw hardware for balanced, secure installation. Lightweight, cadmium-free, and ISO 9001 certified, this anode ensures reliable, eco-conscious defense against costly marine corrosion.

## Description

Buy Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw, silver | Sacrificial Anode for your Rudder, Corrosion protection for your boat in BRACKISH water: Deck Hardware - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Zinks that work - good price work well
Review: Good value! - Good replacement anodes!

## Features

- PREVENT COSTLY MARINE CORROSION DAMAGE: Protect propellers, hull plating, and underwater components from galvanic corrosion. Stop pitting, metal loss, and costly repairs with reliable protection for boats in saltwater and freshwater environments.
- BRACKISH WATER ANODE PERFORMANCE: Aluminum marine anodes deliver reliable corrosion protection in varying salinity conditions, resisting passivation for consistent performance in brackish water applications.
- HIGH-EFFICIENCY ALUMINUM ANODES: Up to 50% longer life than zinc, delivering greater corrosion protection per pound with a lightweight design that helps reduce fuel use. Cadmium-free for a cleaner, environmentally responsible choice.
- SOLD AS A COMPLETE PAIR: Includes two precision-cast sacrificial anodes with stainless steel bolt and nut hardware for secure installation on both sides of the rudder or trim tab, providing balanced corrosion protection.
- TRUSTED MARINE BRAND, ISO 9001 MANUFACTURING: Martyr produces zinc, aluminum, and magnesium sacrificial anodes using a certified ISO 9001 process for consistent quality, reliable corrosion protection, and dependable replacement intervals.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003E1UHOQ |
| Best Sellers Rank | #86,972 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #20 in Sailing Hardware |
| Brand | MARTYR |
| Color | silver |
| Compatible Groove Diameter | 3.75 inches |
| Customer Reviews | 4.7 out of 5 stars 274 Reviews |
| Drive System | "" |
| Exterior Finish | Aluminum |
| Fastener Size | 5/16'' x 1-1/2'' |
| Fastener Type | Screw |
| Finish Types | Uncoated |
| Global Trade Identification Number | 00628309127855 |
| Head Style | Trim |
| Head Type | Flat |
| Included Components | Aluminum Rudder / Trim Tab Anode with Allen Screw |
| Item Diameter | 3.75 inches |
| Item Dimensions | 11.63 x 7 x 5 inches |
| Item Weight | 8.96 ounces |
| Item dimensions L x W x H | 11.63 x 7 x 5 inches |
| Manufacturer | Martyr |
| Material | Aluminum |
| Material Type | Aluminum |
| Maximum Shear Strength | 2,700 psi |
| Metal Type | Aluminum |
| Model | CMR03AL |
| Number Of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Part Number | CMR03AL |
| Point Style | Hex Point |
| Screw Head Style | Trim |
| Screw Point Style | Hex Point |
| Set Screw Thread Type | UNC or UNF |
| Size Name | 0.5" x 3.75" x 0.34" |
| Thread Class | 2A |
| Thread Coverage | "" |
| Thread Size | "" |
| Thread Style | "" |
| Thread Type | Unc Or Unf |
| UPC | 628309127855 |
| Unit Count | 1 Count |
| Warranty Description | 90 days |

## Product Details

- **Exterior Finish:** Aluminum
- **Head Style:** Trim
- **Item dimensions L x W x H:** 11.63 x 7 x 5 inches
- **Material:** Aluminum
- **Thread Size:** ""

## Images

![Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw, silver - Image 1](https://m.media-amazon.com/images/I/81EgL799fAL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Zinks that work
*by P***T on July 29, 2026*

good price work well

### ⭐⭐⭐⭐⭐ Good value!
*by J***S on August 11, 2025*

Good replacement anodes!

### ⭐⭐⭐⭐⭐ Excellent quality
*by J***N on March 15, 2025*

These were quite a bit lighter than the Zinc’s that I’ve used in the past. To test them out I used on of the heavier brand ( more expensive) and one of these. Same performance at half the price!

## Frequently Bought Together

- Martyr CMR03AL Aluminum Rudder/Trim Tab Anode with Allen Screw
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- Martyr Anodes, Streamlined Shaft Anodes with Stainless Steel Slotted Head

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-25*