Skip to content
Celebrating over 50 years of Trusted Marine Service
Over 50 years of Trusted Marine Service

Sacrificial Anodes

Marine Sacrificial Anodes & Corrosion Protection

Shop Marine Sacrificial Anodes

Find zinc anodes, aluminum anodes, magnesium anodes, anode kits, shaft anodes, trim tab anodes, engine anodes, outdrive anodes, propeller anodes, and installation hardware for corrosion protection in saltwater, brackish water, and freshwater applications.

Shop Sacrificial Anodes Zinc Anodes Anode Kits
Material Guide

Match anode material to your water type, then confirm dimensions, mounting style, and exact application.

Read Corrosion Protection Guide

Always confirm anode material, dimensions, fastener style, and application for your vessel, drive, engine, shaft, or underwater hardware.

Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM Shaft Anodes Trim Tab Anodes Outdrive Anodes Propeller Anodes Engine Anodes

Top OEM Anode Searches

Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM

Highlighted Anode Categories

Zinc AnodesCommon saltwater protection Aluminum AnodesSaltwater and brackish use Magnesium AnodesFreshwater applications Anode KitsMatched service sets Shaft AnodesProp shaft protection Trim Tab AnodesTabs and planes Engine AnodesCooling-system protection Outdrive AnodesSterndrive protection Propeller AnodesProp and hub protection

Browse Fast

Shop by Anode Category

Choose the anode material, kit, or application that matches your water type and the metal component you need to protect.

All Sacrificial Anodes Zinc Anodes Aluminum Anodes Magnesium Anodes Anode Kits Shaft Anodes Installation Hardware

Why It Matters

Anodes Help Protect Underwater Metals from Corrosion

Sacrificial anodes are designed to corrode before more valuable underwater metals such as shafts, propellers, trim tabs, outdrives, thru-hulls, and engine cooling components.

Using the correct anode material and replacing anodes before they are fully consumed helps reduce galvanic corrosion and supports longer component life.

H2O

Match Water Type

Zinc is commonly used for saltwater, aluminum can work in saltwater and brackish water, and magnesium is typically used for freshwater applications.

FIT

Confirm Shape and Size

Check diameter, length, hole spacing, thread, mounting hardware, contact surface, and whether the anode fits a shaft, tab, drive, engine, or propeller.

KIT

Use Kits When Possible

Anode kits help replace multiple matched pieces on a drive or engine at the same time, reducing missed parts during seasonal service.

Parts Desk Guidance

Single Anode or Complete Kit?

If one anode is damaged, missing, or consumed faster than the rest, a single replacement may be enough. For seasonal service or unknown history, a complete anode kit can be the better choice because it refreshes all key protection points together.

Choose zinc anodes For many saltwater applications where zinc is specified by the manufacturer or existing setup.
Choose aluminum anodes For many saltwater and brackish applications, especially where aluminum anodes are specified for drives or kits.
Choose magnesium anodes For freshwater applications where magnesium is required and saltwater exposure is not expected.
Choose anode kits For matched replacement sets on outdrives, engines, trim systems, thrusters, or other grouped applications.

Common Questions

Sacrificial Anode Buying Help

How do I choose the correct anode material?

Start with the water type and manufacturer recommendation. Zinc is often used in saltwater, aluminum is common for saltwater or brackish use, and magnesium is typically for freshwater.

When should sacrificial anodes be replaced?

Replace anodes when they are heavily wasted, loose, damaged, missing, or near half consumed. Inspect them regularly and during seasonal service.

Can I mix zinc, aluminum, and magnesium anodes?

Avoid mixing anode materials on the same bonded system unless the manufacturer specifically allows it. Mixed materials can reduce protection or cause uneven performance.

Why do anode dimensions matter?

Anodes need solid metal-to-metal contact and the correct mounting shape. Wrong dimensions, paint, loose fasteners, or poor contact can prevent proper protection.

Ready to Find Your Part?

Search Zinc, Aluminum, Magnesium Anodes & Kits

Use the collection page or search by water type, brand, application, kit, drive model, shaft size, or existing part number.

Shop All Anodes Corrosion Guide Volvo Penta Mercury / MerCruiser Yanmar Crusader Indmar PCM

Filters

$
$
Martyr CMT21 Tear Drop Zinc Hull Anode 5"L x 2"W x .8"H

Martyr CMT21 Tear Drop Zinc Hull Anode 5"L x 2"W x .8"H

$15.11 - $15.11
$15.11
$15.11 - $15.11
$15.11
In stock

Tear Drop Hull AnodeZinc: For use in salt waterAluminum: For use in brackish waterMagnesium: For use in fresh water

$15.11 - $15.11
$15.11
$15.11 - $15.11
$15.11
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$37.05 - $37.05
$37.05
$37.05 - $37.05
$37.05
In stock

Streamlined Shaft Anodes w/Allen Screw

$37.05 - $37.05
$37.05
$37.05 - $37.05
$37.05
Martyr CMX07AL Streamlined Shaft Anode With Stainless Steel Allen Head, Aluminum

Martyr CMX07AL Streamlined Shaft Anode With Stainless Steel Allen Head, Aluminum

$17.21 - $17.21
$17.21
$17.21 - $17.21
$17.21
In stock

Streamlined Shaft Anodes w/Allen Screw

$17.21 - $17.21
$17.21
$17.21 - $17.21
$17.21
Martyr CMT20 Tear Drop Zinc Hull Anode 3.4"L x 1.8"W x .6"H

Martyr CMT20 Tear Drop Zinc Hull Anode 3.4"L x 1.8"W x .6"H

$8.91 - $8.91
$8.91
$8.91 - $8.91
$8.91
In stock

Tear Drop Hull AnodeZinc: For use in salt waterAluminum: For use in brackish waterMagnesium: For use in fresh water

$8.91 - $8.91
$8.91
$8.91 - $8.91
$8.91
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$22.98 - $22.98
$22.98
$22.98 - $22.98
$22.98
In stock

Streamlined Shaft Anodes w/Allen Screw

$22.98 - $22.98
$22.98
$22.98 - $22.98
$22.98
Martyr Replacement Prop Nut Anode, Zinc, Series B

Martyr Replacement Prop Nut Anode, Zinc, Series B

$15.11 - $15.11
$15.11
$15.11 - $15.11
$15.11
In stock

Replacement Prop Nut Anode

$15.11 - $15.11
$15.11
$15.11 - $15.11
$15.11
Martyr CMSZ150350KITM Suzuki Anode Kit, 150-300HP, Magnesium

Martyr CMSZ150350KITM Suzuki Anode Kit, 150-300HP, Magnesium

$81.89 - $81.89
$81.89
$81.89 - $81.89
$81.89
In stock

Comes complete with anodes, hardware and installation instructions .CMSZ150350KIT 150-350HP Includes: CM3C7602181A0 (1), CM5532187J00 (8), CM553209...

View full details
$81.89 - $81.89
$81.89
$81.89 - $81.89
$81.89
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$23.40 - $23.40
$23.40
$23.40 - $23.40
$23.40
In stock

Streamlined Shaft Anodes w/Allen Screw

$23.40 - $23.40
$23.40
$23.40 - $23.40
$23.40
Martyr CMX05M Streamlined Shaft Anode With Stainless Steel Allen Head, Magnesium

Martyr CMX05M Streamlined Shaft Anode With Stainless Steel Allen Head, Magnesium

$27.89 - $27.89
$27.89
$27.89 - $27.89
$27.89
In stock

Streamlined Shaft Anodes w/Allen Screw

$27.89 - $27.89
$27.89
$27.89 - $27.89
$27.89
1-1/4" Shaft Anode Ext Heavy, Zinc

1-1/4" Shaft Anode Ext Heavy, Zinc

$28.86 - $28.86
$28.86
$28.86 - $28.86
$28.86
In stock

Streamlined Shaft Anodes w/Allen Screw

$28.86 - $28.86
$28.86
$28.86 - $28.86
$28.86
Martyr BRP OMC Johnson/Evinrude V4-V6 HP Anode Kit, Magnesium

Martyr BRP OMC Johnson/Evinrude V4-V6 HP Anode Kit, Magnesium

$71.29 - $71.29
$71.29
$71.29 - $71.29
$71.29
In stock

Comes complete with 3 anodes, hardware and installation instructions .CMOMCV4V6KIT BRP Johnson/Evinrude V4-V6 Kit- Includes: CM393023 (1), CM392123...

View full details
$71.29 - $71.29
$71.29
$71.29 - $71.29
$71.29
Martyr CMX06M Streamlined Shaft Anode With Stainless Steel Allen Head, Magnesium

Martyr CMX06M Streamlined Shaft Anode With Stainless Steel Allen Head, Magnesium

$40.29 - $40.29
$40.29
$40.29 - $40.29
$40.29
In stock

Streamlined Shaft Anodes w/Allen Screw

$40.29 - $40.29
$40.29
$40.29 - $40.29
$40.29
1-1/4" Shaft Anode, Zinc

1-1/4" Shaft Anode, Zinc

$22.98 - $22.98
$22.98
$22.98 - $22.98
$22.98
In stock

Streamlined Shaft Anodes w/Allen Screw

$22.98 - $22.98
$22.98
$22.98 - $22.98
$22.98
Martyr CMSZ150350KITZ Suzuki Anode Kit, 150-300HP, Zinc

Martyr CMSZ150350KITZ Suzuki Anode Kit, 150-300HP, Zinc

$55.43 - $55.43
$55.43
$55.43 - $55.43
$55.43
In stock

Comes complete with anodes, hardware and installation instructions .CMSZ150350KIT 150-350HP Includes: CM3C7602181A0 (1), CM5532187J00 (8), CM553209...

View full details
$55.43 - $55.43
$55.43
$55.43 - $55.43
$55.43
Martyr CMN1 Zinc Hull Anode 3.16" x 8.5"

Martyr CMN1 Zinc Hull Anode 3.16" x 8.5"

$34.01 - $34.01
$34.01
$34.01 - $34.01
$34.01
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$34.01 - $34.01
$34.01
$34.01 - $34.01
$34.01
Martyr CMX06AL Streamlined Shaft Anode With Stainless Steel Allen Head, Aluminum

Martyr CMX06AL Streamlined Shaft Anode With Stainless Steel Allen Head, Aluminum

$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00
In stock

Streamlined Shaft Anodes w/Allen Screw

$17.00 - $17.00
$17.00
$17.00 - $17.00
$17.00
Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

$70.76 - $70.76
$70.76
$70.76 - $70.76
$70.76
In stock

CMSXAKIT Includes:CM3841427 (1)CM3883728 (1)

$70.76 - $70.76
$70.76
$70.76 - $70.76
$70.76
Martyr CMSZ150350KITA Suzuki Anode Kit, 150-300HP, Aluminum

Martyr CMSZ150350KITA Suzuki Anode Kit, 150-300HP, Aluminum

$52.38 - $52.38
$52.38
$52.38 - $52.38
$52.38
In stock

Comes complete with anodes, hardware and installation instructions .CMSZ150350KIT 150-350HP Includes: CM3C7602181A0 (1), CM5532187J00 (8), CM553209...

View full details
$52.38 - $52.38
$52.38
$52.38 - $52.38
$52.38
Sl Shaft Anode CMX04AL (1-1/8), Aluminum

Sl Shaft Anode CMX04AL (1-1/8), Aluminum

$13.22 - $13.22
$13.22
$13.22 - $13.22
$13.22
In stock

Streamlined Shaft Anodes w/Allen Screw

$13.22 - $13.22
$13.22
$13.22 - $13.22
$13.22
Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

$54.80 - $54.80
$54.80
$54.80 - $54.80
$54.80
In stock

CMSXAKIT Includes:CM3841427 (1)CM3883728 (1)

$54.80 - $54.80
$54.80
$54.80 - $54.80
$54.80
Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

Martyr Anode Kit For Volvo Penta SX-A/DPS Engine (Contains 1-3841427, 1-3883728 and Fastening Hardware)

$67.99 - $67.99
$67.99
$67.99 - $67.99
$67.99
In stock

CMSXAKIT Includes:CM3841427 (1)CM3883728 (1)

$67.99 - $67.99
$67.99
$67.99 - $67.99
$67.99
CMX04M Sl Shaft Anode (1-1/8), Magnesium

CMX04M Sl Shaft Anode (1-1/8), Magnesium

$26.99 - $26.99
$26.99
$26.99 - $26.99
$26.99
In stock

Streamlined Shaft Anodes w/Allen Screw

$26.99 - $26.99
$26.99
$26.99 - $26.99
$26.99
CMX03M 1" Shaft Anode, Magnesium

CMX03M 1" Shaft Anode, Magnesium

$26.59 - $26.59
$26.59
$26.59 - $26.59
$26.59
In stock

Streamlined Shaft Anodes w/Allen Screw

$26.59 - $26.59
$26.59
$26.59 - $26.59
$26.59
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$18.68 - $18.68
$18.68
$18.68 - $18.68
$18.68
In stock

Streamlined Shaft Anodes w/Allen Screw

$18.68 - $18.68
$18.68
$18.68 - $18.68
$18.68
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$92.91 - $92.91
$92.91
$92.91 - $92.91
$92.91
In stock

Streamlined Shaft Anodes w/Allen Screw

$92.91 - $92.91
$92.91
$92.91 - $92.91
$92.91
1" Shaft Anode, Zinc

1" Shaft Anode, Zinc

$16.68 - $16.68
$16.68
$16.68 - $16.68
$16.68
In stock

Streamlined Shaft Anodes w/Allen Screw

$16.68 - $16.68
$16.68
$16.68 - $16.68
$16.68
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$128.40 - $128.40
$128.40
$128.40 - $128.40
$128.40
In stock

Streamlined Shaft Anodes w/Allen Screw

$128.40 - $128.40
$128.40
$128.40 - $128.40
$128.40
Martyr CMMZ404 Zinc Hull Anode 3.375" x 8.8"

Martyr CMMZ404 Zinc Hull Anode 3.375" x 8.8"

$43.04 - $43.04
$43.04
$43.04 - $43.04
$43.04
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$43.04 - $43.04
$43.04
$43.04 - $43.04
$43.04
Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Streamlined Shaft Anode With Stainless Steel Allen Head, Zinc

$107.61 - $107.61
$107.61
$107.61 - $107.61
$107.61
In stock

Streamlined Shaft Anodes w/Allen Screw

$107.61 - $107.61
$107.61
$107.61 - $107.61
$107.61
1-1/8" Shaft Anode, Zinc

1-1/8" Shaft Anode, Zinc

$19.41 - $19.41
$19.41
$19.41 - $19.41
$19.41
In stock

Streamlined Shaft Anodes w/Allen Screw

$19.41 - $19.41
$19.41
$19.41 - $19.41
$19.41
Martyr CMMZC406 Zinc Hull Anode 4.4" x 9"

Martyr CMMZC406 Zinc Hull Anode 4.4" x 9"

$121.05 - $121.05
$121.05
$121.05 - $121.05
$121.05
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$121.05 - $121.05
$121.05
$121.05 - $121.05
$121.05
Sl Shaft Anode CMX03AL (1), Aluminum

Sl Shaft Anode CMX03AL (1), Aluminum

$11.85 - $11.85
$11.85
$11.85 - $11.85
$11.85
In stock

Streamlined Shaft Anodes w/Allen Screw

$11.85 - $11.85
$11.85
$11.85 - $11.85
$11.85
Martyr CMM40 Zinc Hull Anode .5" x 2.6" x 7.3"

Martyr CMM40 Zinc Hull Anode .5" x 2.6" x 7.3"

$27.29 - $27.29
$27.29
$27.29 - $27.29
$27.29
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$27.29 - $27.29
$27.29
$27.29 - $27.29
$27.29
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$38.31 - $38.31
$38.31
$38.31 - $38.31
$38.31
In stock

Limited Clearance Shaft Anode w/Allen Screw

$38.31 - $38.31
$38.31
$38.31 - $38.31
$38.31
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$38.84 - $38.84
$38.84
$38.84 - $38.84
$38.84
In stock

Limited Clearance Shaft Anode w/Allen Screw

$38.84 - $38.84
$38.84
$38.84 - $38.84
$38.84
7/8" Shaft Anode, Zinc

7/8" Shaft Anode, Zinc

$18.26 - $18.26
$18.26
$18.26 - $18.26
$18.26
In stock

Streamlined Shaft Anodes w/Allen Screw

$18.26 - $18.26
$18.26
$18.26 - $18.26
$18.26
Sl Shaft Anode CMX02M (7/8), Magnesium

Sl Shaft Anode CMX02M (7/8), Magnesium

$21.19 - $21.19
$21.19
$21.19 - $21.19
$21.19
In stock

Streamlined Shaft Anodes w/Allen Screw

$21.19 - $21.19
$21.19
$21.19 - $21.19
$21.19
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$28.02 - $28.02
$28.02
$28.02 - $28.02
$28.02
In stock

Limited Clearance Shaft Anode w/Allen Screw

$28.02 - $28.02
$28.02
$28.02 - $28.02
$28.02
Sl Shaft Anode CMX02AL (7/8), Aluminum

Sl Shaft Anode CMX02AL (7/8), Aluminum

$11.85 - $11.85
$11.85
$11.85 - $11.85
$11.85
In stock

Streamlined Shaft Anodes w/Allen Screw

$11.85 - $11.85
$11.85
$11.85 - $11.85
$11.85
Martyr 875821 Anode For Volvo Penta

Martyr 875821 Anode For Volvo Penta

$29.19 - $29.19
$29.19
$29.19 - $29.19
$29.19
In stock

Volvo duo prop ring anode, magnesium.

$29.19 - $29.19
$29.19
$29.19 - $29.19
$29.19
Martyr 984513 Anode For BRP (OMC/Johnson Evinrude)

Martyr 984513 Anode For BRP (OMC/Johnson Evinrude)

$49.86 - $49.86
$49.86
$49.86 - $49.86
$49.86
In stock

Zinc: For use in salt waterAluminum: For use in brackish waterMagnesium: For use in fresh water

$49.86 - $49.86
$49.86
$49.86 - $49.86
$49.86
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$27.60 - $27.60
$27.60
$27.60 - $27.60
$27.60
In stock

Limited Clearance Shaft Anode w/Allen Screw

$27.60 - $27.60
$27.60
$27.60 - $27.60
$27.60
Martyr 875821 Anode For Volvo Penta

Martyr 875821 Anode For Volvo Penta

$34.01 - $34.01
$34.01
$34.01 - $34.01
$34.01
In stock

Volvo duo prop ring anode, zinc.

$34.01 - $34.01
$34.01
$34.01 - $34.01
$34.01
Martyr CMM25 Zinc Hull Anode .72" x 3.25" x 9.08"

Martyr CMM25 Zinc Hull Anode .72" x 3.25" x 9.08"

$39.05 - $39.05
$39.05
$39.05 - $39.05
$39.05
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$39.05 - $39.05
$39.05
$39.05 - $39.05
$39.05
Martyr CMM30 Zinc Hull Anode .56" x 2.67" x 6"

Martyr CMM30 Zinc Hull Anode .56" x 2.67" x 6"

$25.08 - $25.08
$25.08
$25.08 - $25.08
$25.08
In stock

Hull Anode - Zinc.Hole dimension is the distance between holes.

$25.08 - $25.08
$25.08
$25.08 - $25.08
$25.08
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$16.16 - $16.16
$16.16
$16.16 - $16.16
$16.16
In stock

Limited Clearance Shaft Anode w/Allen Screw

$16.16 - $16.16
$16.16
$16.16 - $16.16
$16.16
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$21.93 - $21.93
$21.93
$21.93 - $21.93
$21.93
In stock

Limited Clearance Shaft Anode w/Allen Screw

$21.93 - $21.93
$21.93
$21.93 - $21.93
$21.93
Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

Martyr Limited Clearance Shaft Anode With Stainless Steel Allen Head, Zinc

$16.89 - $16.89
$16.89
$16.89 - $16.89
$16.89
In stock

Limited Clearance Shaft Anode w/Allen Screw

$16.89 - $16.89
$16.89
$16.89 - $16.89
$16.89