Marine anodes, including zinc, aluminum, and magnesium anodes, are sacrificial metal components used to protect the hull and underwater metal parts of boats and yachts from galvanic corrosion. By corroding preferentially, the anodes help protect more valuable submerged components such as hull fittings, propeller shafts, rudders, trim tabs, and other bonded metal parts.
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1-2 weeks delivery time Tecnoseal zinc plain rod anodes available in diameters from Ø10 to Ø240 mm and lengths from 100 to 750 mm. The range includes multiple length options for selected diameters, including Ø20, Ø25, Ø45, Ø50, Ø60, Ø70, Ø80, Ø90, Ø100 and Ø150 mm. Individual weights range from 0.22 kg to 132.00 kg depending on diameter and length. All variants in this card are zinc (ZN) plain, non-threaded rods. Select the required model according to rod diameter, overall length and weight.
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$ 19.20
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1-2 weeks delivery time Vetus split zinc shaft collar anodes for cathodic protection of marine propeller shafts, available for metric shaft diameters from 25 to 60 mm and imperial sizes from 1" to 2". The two-piece collar design allows installation around the shaft and is secured with 2 or 4 bolts depending on size. Metric ZINKAS models range from 0.46 to 1.87 kg, while ZASA inch-size versions range from 0.40 to 1.40 kg. Manufactured from zinc to MIL-A-18001K specification for marine shaft installations.
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$ 28.04
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1-2 weeks delivery time Vetus SAC USA Type zinc shaft collar anodes for cathodic protection of marine propeller shafts. The range covers imperial shaft diameters from 1 1/4" to 2 1/2", with outside diameters from 58 to 105 mm, heights from 50 to 98 mm and net weights from 0.45 to 2.35 kg. The split collar construction allows direct installation around the shaft and is secured with two bolts.
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$ 20.28
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1-2 weeks delivery time Vetus SAR zinc shaft ring anodes for cathodic protection of marine propeller shafts in salt and brackish water. The split ring design allows direct installation around metric shafts from Ø25 to Ø50 mm. Available models have outside diameters from 65 to 89 mm, heights from 18 to 25 mm and zinc weights from 0.25 to 0.71 kg.
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$ 17.29
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1-2 weeks delivery time Vetus BOA rectangular aluminium hull anodes with integrated steel mounting strap for cathodic protection of underwater metal components. Available in five sizes with anode body dimensions from 130 x 60 x 30 mm to 340 x 150 x 35 mm and net aluminium weights from 0.31 to 3.70 kg. BOA003A, BOA004A and BOA005A use mounting straps with fixing slots, while BOA006A and BOA007A are supplied with steel straps without holes.
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$ 18.49
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1-2 weeks delivery time Vetus BOA rectangular zinc hull anodes with integrated steel mounting straps for cathodic protection of underwater metal components in salt and brackish water. The range includes seven sizes with anode body dimensions from 85 x 35 x 16 mm to 340 x 150 x 35 mm and net zinc weights from 0.20 to 9.70 kg. BOA001Z through BOA005Z feature slotted mounting straps, while BOA006Z and BOA007Z are supplied with steel straps without holes.
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$ 90.67
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1-2 weeks delivery time Vetus BOA zinc plate hull anodes for cathodic protection of underwater metal components in salt and brackish water. The low-profile rectangular range includes five bolt-on sizes from 146 x 64 x 19 mm to 303 x 151 x 13 mm, with net zinc weights from 0.90 to 3.30 kg. Each model features two elongated mounting slots with specified centre-to-centre spacing for secure installation and straightforward replacement.
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$ 29.82
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1-2 weeks delivery time Vetus STAD zinc stern disc anodes for cathodic protection of stern-mounted underwater metal components. Available in four versions with outside diameters from Ø125 to Ø140 mm, heights from 30 to 47 mm and net zinc weights from 2.70 to 3.70 kg. STAD001Z, STAD002Z and STAD003Z use recessed central mounting bores, while STAD004Z features an M50x3 threaded connection.
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$ 103.20
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1-2 weeks delivery time Vetus connection kits for installation of V-Quipment bolt-on hull anodes. ZKITS is designed for steel hulls and uses an M10 stud mounting system, while ZKITP is intended for GRP, fibreglass and wooden hulls with through-hull M10 mounting and electrical connection to the underwater metal components being protected. Type 8 anodes require one connection kit, while Types 15, 15S, 25, 25S and 35 require two kits.
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$ 18.49
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1-2 weeks delivery time Vetus RAD zinc rudder disc anodes for cathodic protection of marine rudder components in salt and brackish water. The range includes five bolt-on sizes from Ø50 x 11 mm to Ø140 x 30 mm, with zinc weights from 83 to 1500 g. Each disc features a recessed central mounting arrangement with specific d1 and d2 dimensions for secure installation.
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$ 56.07
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1-2 weeks delivery time Vetus V-Quipment aluminium weld-on hull anodes for cathodic protection of underwater metal components, manufactured from aluminium-indium-zinc alloy to MIL-A-24779 (SH). The range includes rectangular and drop-shaped versions with aluminium anode weights from 0.25 to 1.17 kg and body dimensions from 113 x 60 x 17 mm to 190 x 85 x 35 mm for rectangular models and from 118 x 78 x 25 mm to 160 x 100 x 42 mm for drop-shaped models. Each anode is supplied with an integrated steel strap for direct welding to the hull.
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$ 22.67
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1-2 weeks delivery time Vetus V-Quipment zinc weld-on hull anodes for cathodic protection of underwater metal components in salt and brackish water. Manufactured from zinc to MIL-A-18001K specification, the range includes rectangular and drop-shaped versions with net zinc weights from 0.77 to 2.72 kg. Anode body sizes range from 113 x 60 x 22 mm to 190 x 85 x 35 mm for rectangular models and from 118 x 78 x 25 mm to 160 x 100 x 42 mm for drop-shaped models. Each anode incorporates a steel mounting strap for direct welding to the hull.
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$ 32.21
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1-2 weeks delivery time The MgDuff MGDA Aluminium Propeller Shaft Anode is a ring-shaped sacrificial anode designed to protect marine propeller shafts against corrosion in brackish and saltwater environments. Its steel core prevents the anode from becoming loose around the shaft. Available in six versions for shaft diameters of 25, 30, 35, 40, 45 and 50 mm, with body lengths of 65–100 mm and external diameters of 56–85 mm. The aluminium construction provides sacrificial corrosion protection, while the steel core helps maintain the anode's position around the shaft.
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$ 46.97
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1-2 weeks delivery time The MgDuff ASC Aluminium Propeller Shaft Ring Anode is designed for installation against the front face of the propeller, providing sacrificial corrosion protection in brackish and saltwater environments. Available in seven variants for shaft diameters of 22, 25, 30, 35, 40, 45 and 50 mm. The ring-shaped aluminium anodes have external diameters of 60–81 mm and overall lengths of 15.5 or 18 mm, depending on the selected model. Choose the appropriate ASC version according to the propeller shaft diameter and required external dimensions.
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$ 17.53
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1-2 weeks delivery time The MG Duff ZSC Zinc Propeller Shaft Ring Anodes are designed to provide sacrificial corrosion protection for marine propeller shafts. Manufactured from zinc, the range includes four models for shaft diameters of 25, 30, 35 and 40 mm. The ZSC25 and ZSC30 have an external diameter of 63 mm, while the ZSC35 and ZSC40 measure 76 mm in external diameter. All four models have an overall length of 32 mm. The ZSC25 features a steel core designed to prevent loosening around the shaft and is specified for saltwater use. Available models: ZSC25, ZSC30, ZSC35 and ZSC40. Supplied individually.
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$ 45.32
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1-2 weeks delivery time The MG Duff ZSA Zinc Spherical Anodes are designed to provide sacrificial corrosion protection for marine propeller shafts. Manufactured from zinc, the range includes three models for shaft diameters of 38 mm (1 1/2"), 51 mm (2") and 57 mm (2 1/4"). The anodes feature rounded bodies with external diameters of 70, 91 and 108 mm and corresponding lengths of 63, 73 and 95 mm. Available models include ZSA150, ZSA200 and ZSA225. Each anode is supplied individually. Select the appropriate model according to the shaft diameter and available installation space.
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$ 50.83
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1-2 weeks delivery time The MgDuff CMAN Zinc Propeller Shaft Cap Nut Anode is designed for corrosion protection in marine propeller assemblies. It features a tapered section with an integrated keyway designed to match the OEM hub used in Beneteau and Jeanneau propeller configurations. Available in five variants for shaft diameters of 25, 30, 35, 40 and 45 mm, with corresponding mounting hole diameters of 25–45 mm and external anode diameters ranging from 34 to 61 mm. Manufactured from zinc, the anode provides sacrificial corrosion protection for marine metal components. Each variant is supplied individually.
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$ 15.27
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1-2 weeks delivery time The MgDuff Aluminium Hull and Rudder Anode is a rectangular sacrificial anode designed to protect marine metal components against galvanic corrosion in freshwater, brackish water and saltwater environments. Manufactured from an aluminium alloy designed for uniform consumption, the range includes three models: AD72B (457 × 102 × 64 mm) with 229 mm mounting hole spacing, AD77EURO (318 × 65 × 32 mm) with adjustable hole spacing of 110–210 mm and AD78B (305 × 76 × 32 mm) with 200 mm hole spacing. The AD77EURO and AD78B models feature two M10 bolt holes instead of a welding strip. Each anode is supplied individually.
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$ 165.49
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1-2 weeks delivery time The MG Duff 40AHD Aluminium Anode is a rectangular sacrificial anode designed to provide corrosion protection for boat hulls and rudders. Manufactured from aluminium, the anode measures 200 mm in length, 100 mm in width and 40 mm in height. It features two recessed mounting holes with a centre-to-centre spacing of 110 mm for bolt-on installation.
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$ 101.93
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1-2 weeks delivery time The MgDuff Magnesium Hull and Rudder Anode is a rectangular sacrificial anode designed to protect boat hulls and rudders against galvanic corrosion. Available in three models: MD72B (457 × 102 × 64 mm) with 229 mm mounting hole spacing, MD77EURO (318 × 65 × 32 mm) with a mounting hole spacing range of 110–210 mm, and MD78B (305 × 76 × 32 mm) with 200 mm mounting hole spacing. Manufactured from magnesium, these anodes feature mounting openings for installation on the vessel. Each model is supplied individually.
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$ 252.45
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How do Aluminum, Zinc, and Magnesium Anodes differ in protecting a boat?
Aluminum, zinc, and magnesium anodes all provide cathodic protection by acting as sacrificial metals, but their effectiveness depends on the water type and their electrochemical potential. Zinc anodes are traditionally used in saltwater and provide reliable protection in high-salinity environments. Aluminum anodes are more electrochemically active than zinc and offer a higher protective capacity for their weight, making them suitable for saltwater and brackish water and, with the correct alloy, many freshwater applications. Magnesium is the most active of the three materials and is primarily intended for freshwater, where its higher driving voltage provides effective protection in low-conductivity conditions. Magnesium anodes should generally not be used in saltwater or brackish water, as they may provide excessive protection and be consumed too rapidly.
Why is anode placement on the hull plate important for effective corrosion protection?
Correct anode placement is essential because sacrificial anodes must be electrically connected to the metal they protect and positioned where protective current can reach exposed underwater surfaces effectively. On metal hulls, anodes should be distributed around areas that are most susceptible to galvanic corrosion, including the hull plating, rudder, propeller shaft, stern gear, and other submerged metal components. Poorly positioned, undersized, or electrically isolated anodes may leave parts of the structure insufficiently protected. Proper distribution helps maintain a more uniform protective potential across the underwater metalwork and reduces the risk of localized corrosion.