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 Renault Marine type propeller nuts for shaft sizes from Ø22–25 mm up to Ø40/50 mm. The range includes several thread configurations, including 16x2, 20x2.5, 28x2.5, M20, M24, M27, M30, 20x2, 26x2, 27x1.5, 30x1.5 and 36x1.5. Depending on the model, the nuts measure 36–54 mm in height and Ø27–50 mm in outside diameter, with individual weights from 0.08 to 0.45 kg. Select the required version by shaft size and thread specification.
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$ 34.37
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1-2 weeks delivery time Tecnoseal zinc replacement propeller anodes for Riva installations, available in two versions for shaft sizes Ø20–30 mm and Ø35–50 mm. Tecnoseal 00430 measures Ø38 x 38 mm, weighs 0.16 kg and replaces Riva propeller anodes 00440 through 00448. Tecnoseal 00431 measures Ø52 x 53 mm, weighs 0.34 kg and replaces models 00449 through 00454-1. Both versions feature a Ø2 diameter of 6.5 mm.
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$ 19.45
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1-2 weeks delivery time Tecnoseal zinc Riva propeller anodes supplied complete with brass plug, available for shaft sizes Ø20–30 mm and Ø35–50 mm. The Ø20–30 mm versions measure Ø38 x 65 mm and are offered with several thread options from 14x1.5 to 20x2.5, including a 3/4" W version and a no-thread configuration. The larger Ø35–50 mm models measure Ø52 x 84 mm and are available with threads from 24x1.5 to 33x2, as well as 1" GAS, 1" W and a no-thread version. Select the required model according to shaft size and thread specification.
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$ 121.04
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1-2 weeks delivery time Tecnoseal zinc Riva propeller anodes with fixed brass plug, available for shaft sizes Ø20–30 mm and Ø35–50 mm. The Ø20–30 mm models measure Ø38 x 69 mm, weigh 0.39 kg and are offered with thread options from 14x1.5 to 20x2.5, including a 3/4" W version. The larger Ø35–50 mm models measure Ø52 x 102 mm, weigh 1.09 kg and are available with 25x1.5, 24x2, 26x2, 30x2, 33x2 and 1" GAS threads. The brass plug is fixed and the zinc part is not replaceable.
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$ 111.29
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1-2 weeks delivery time Tecnoseal zinc Riva MTF series propeller anodes for shaft sizes Ø20–30 mm and Ø35–50 mm. Models for Ø20–30 mm shafts measure Ø38 x 60 mm and are available with 14x1.5, 16x1.5, 18x1.5 and 20x1.5 threads, as well as a no-thread version. Models for Ø35–50 mm shafts measure Ø52 x 84 mm and are offered with 24x2, 26x2 and 30x2 threads or without thread. Individual weights range from 0.37 to 0.96 kg. Select the required version according to shaft size and thread configuration.
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$ 121.04
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1-2 weeks delivery time Tecnoseal zinc replacement propeller anodes for MTF series installations, available for shaft ranges Ø20–30 mm, Ø35–50 mm and Ø50–100 mm. Tecnoseal 00430MTF measures Ø38 x 38 mm and weighs 0.14 kg, 00431MTF measures Ø52 x 50 mm and weighs 0.25 kg, while 00432MTF measures Ø66 x 74 mm and weighs 0.77 kg. Select the required version according to shaft diameter and matching anode dimensions.
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$ 19.45
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1-2 weeks delivery time Tecnoseal zinc propeller anodes for Solé Diesel installations, available for shaft sizes Ø25, Ø30, Ø35–40, Ø45–50 and Ø60–65 mm. Depending on the model, the anodes measure Ø32–75 mm in outside diameter and 39–85 mm in height, with individual weights from 0.12 to 1.50 kg. Corresponding Solé original part numbers are 40025092, 40030092, 40035092, 40045092 and 40060092. Select the required version according to shaft diameter and matching anode dimensions.
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$ 22.71
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1-2 weeks delivery time Tecnoseal zinc USA-type propeller nut anodes, available in eight sizes from Ø32 x 44 mm to Ø85 x 105 mm. Depending on the model, weights range from 0.10 to 1.60 kg, with c dimensions from 23 to 62 mm, h1 from 11 to 28 mm, Ø1 from 6.5 to 10.5 mm and Ø2 from 12 to 18 mm. The range includes Tecnoseal TEC-PNA, TEC-PNB, TEC-PNC, TEC-PND, TEC-PNE, TEC-PNF, TEC-PNG and TEC-PNH. Select the required version according to outside diameter, height and mounting dimensions.
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$ 41.25
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1-2 weeks delivery time The MG Duff CM865182A Aluminium Spherical Anode is designed to provide sacrificial corrosion protection for marine metal components. Manufactured from aluminium, the anode features a rounded body measuring 53 mm in diameter and 61 mm in length. Its specified mounting dimensions are 5/16"-18 × 1 1/2". The anode is designed for marine applications and helps protect electrically connected metal components against galvanic corrosion. Product number CM865182A, EAN 0628309123291. Supplied individually.
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$ 43.19
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1-2 weeks delivery time The MgDuff MGD Zinc Propeller Shaft Anode is a ring-shaped sacrificial anode designed to protect marine propeller shafts against corrosion in saltwater environments. Its integrated steel core prevents the anode from becoming loose around the shaft. Available in nine variants for imperial shaft diameters of 3/4", 7/8", 1", 1 1/8", 1 1/4", 1 3/8", 1 1/2", 1 3/4" and 2". Depending on the selected version, the anode measures 65, 78 or 100 mm in length, with external diameters of 56, 70 or 85 mm. Manufactured from zinc, it provides sacrificial corrosion protection for marine shaft installations.
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$ 46.16
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1-2 weeks delivery time The MgDuff Zinc Propeller Shaft Anode is a ring-shaped sacrificial anode designed to protect marine propeller shafts against corrosion in saltwater environments. Its integrated steel core prevents the anode from becoming loose around the shaft. Available in eight variants for shaft diameters of 25, 30, 40, 45, 50, 60 and 70 mm, with anode lengths ranging from 32 to 100 mm and external diameters from 56 to 113 mm. Two versions are available for Ø25 mm shafts, differing in their external dimensions: 65 × Ø56 mm and 32 × Ø63 mm. Manufactured from zinc, these anodes provide sacrificial corrosion protection for marine shaft installations.
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$ 34.49
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1-2 weeks delivery time The MG Duff CM865182Z Zinc Spherical Anode is designed to provide sacrificial corrosion protection for marine metal components. Manufactured from zinc, the anode features a rounded body measuring 53 mm in diameter and 61 mm in length, with a specified fitting size of 5/16"-18 × 1 1/2". It acts as a sacrificial component to help protect electrically connected metal parts against galvanic corrosion. Product number CM865182Z, EAN 0628309123581. Supplied individually.
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$ 47.55
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1-2 weeks delivery time The MME Zinc Propeller Shaft Anodes are designed to provide sacrificial corrosion protection for boat propeller shafts and associated metal components. Manufactured from zinc, the range includes six models: MME22ZS, MME25ZS, MME28ZS, MME32ZS, MME35ZS and MME38ZS. The anodes are intended for marine shaft installations, with the MME35ZS specifically described as suitable for saltwater environments. The product photograph shows an anode with a split body and visible fastening screws. Shaft compatibility and mounting dimensions should be checked for the selected model before ordering.
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$ 13.39
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1-2 weeks delivery time The MME Zinc Pencil Anodes are rod-shaped sacrificial anodes designed to provide corrosion protection for metal components. Manufactured from zinc, the range includes 10 variants with diameters of 10, 12, 16, 20 and 25 mm, each available in lengths of 50 or 100 mm. The cylindrical design provides a range of dimensional options for selecting replacement anodes according to the required diameter and length. Available models include MMEZP10-100, MMEZP10-50, MMEZP12-100, MMEZP12-50, MMEZP16-100, MMEZP16-50, MMEZP20-100, MMEZP20-50, MMEZP25-100 and MMEZP25-50. Each anode is supplied individually.
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$ 6.13
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1-2 weeks delivery time The MME Bronze Plugs are designed for mounting zinc pencil anodes with diameters of 10, 12, 16, 20 and 25 mm. The range includes five models with NPT connection sizes of 1/4", 3/8", 1/2", 3/4" and 1", respectively. Plug lengths vary from 19 to 36 mm depending on the selected version. Available models include MMEVMN070 for Ø10 mm pencils, MMEVMN071 for Ø12 mm, MMEVMN072 for Ø16 mm, MMEVMN073 for Ø20 mm and MMEVMN074 for Ø25 mm. Each plug is supplied individually.
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$ 20.43
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1-2 weeks delivery time The MME ZR Zinc Alloy Rod Anodes are cylindrical sacrificial anodes designed for cathodic corrosion protection in marine and industrial applications. Manufactured from zinc alloy specified according to U.S. MIL Spec. A-18001K, the range includes 13 variants with diameters of 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125 and 150 mm. All models have a nominal length of 500 mm, with an additional 600 mm version available in Ø20 mm. Nominal weights range from 1.12 to 63.09 kg. The zinc alloy has a nominal electrochemical capacity of 780 Ah/kg and a nominal potential of -1050 mV versus an Ag/AgCl reference cell in seawater. Each anode is supplied individually.
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$ 35.82
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1-2 weeks delivery time The MME Pitguard Aluminium Anodes are designed to provide sacrificial corrosion protection for boat hulls and marine metal components. Manufactured from aluminium, the range includes four models with body lengths of 205, 235 and 305 mm, widths of 63 or 80 mm and heights of 70 or 95 mm. The MME22AP and MME33AP feature bodies measuring 205 × 63 × 70 mm and 305 × 63 × 70 mm, respectively, while the MME45AP and MME58AP measure 235 × 80 × 95 mm and 305 × 80 × 95 mm. Specified anode strip lengths range from 260 to 360 mm, depending on the model. Each anode is supplied individually.
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$ 72.12
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1-2 weeks delivery time The MME Aluminium Tank Sacrificial Anodes are designed to provide corrosion protection for metal tanks. The range includes 28 variants in 14 body sizes, with rectangular aluminium bodies measuring 205–1525 mm in length, 63 or 80 mm in width and 70 or 95 mm in height. Each size is available in two mounting strip configurations: AT with bent ends and ATST with a straight strip. Specified strip lengths range from 720 to 2120 mm, depending on the selected model. Both versions share the same stated body dimensions and strip length within each size group but have different product numbers and EAN codes. Each anode is supplied individually.
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$ 50.15
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1-2 weeks delivery time The MME Pitguard Zinc Sacrificial Anodes are designed to protect marine metal components against corrosion. The range includes seven zinc alloy models with body lengths of 305–625 mm, widths of 45–80 mm and heights of 45–95 mm. Each anode features a steel mounting insert and an M10 clamping arrangement, with overall horizontal lengths ranging from 355 to 680 mm. Available models include MME40ZP, MME60ZP, MME89ZP, MME100ZP, MME120ZP, MME150ZP and MME156ZP. Nominal net weights range from 4.0 to 15.6 kg. The zinc alloy specifications are in accordance with U.S. MIL Spec. A-18001K. Each anode is supplied with one clamp.
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$ 276.63
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1-2 weeks delivery time The MME Zinc Tank Sacrificial Anodes are designed to provide corrosion protection for metal tanks. The range includes 26 variants in 13 body sizes, manufactured from zinc with rectangular bodies measuring 205–1250 mm in length, 50–80 mm in width and 45–95 mm in height. Each size is available in two mounting configurations: ZT with bent-end mounting strips and ZTST with straight mounting strips. Specified strip lengths range from 695 to 1870 mm, depending on the selected model. Corresponding ZT and ZTST variants share the same body dimensions and stated strip length but differ in mounting configuration. Each anode is supplied individually.
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$ 153.64
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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.