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 The MME M Clamp is a steel mounting component designed for securing tank anodes. It features an M-shaped clamping arrangement with a maximum clamping width of 40 mm and two high-tensile steel set bolts: M10 × 40 mm and M10 × 75 mm, both with lock nuts. The technical drawing specifies a Ø14 mm upper mounting hole and a nominal net weight of 0.95 kg. Product number MMEVMN010, EAN 8720193042244. Supplied individually.
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$ 24.57
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1-2 weeks delivery time E. Polipodio RI008 Riva shaft nut anode assembly for Ø40 mm shaft installations, corresponding to Trem L8113140 and model RI-5. The complete assembly consists of a bronze ogive with zinc anode and CE screw. Technical dimensions are A Ø52 mm and overall height H 88 mm, with F thread size 26x2 mm. Material of the sacrificial anode is zinc (ZN).
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$ 143.56
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1-2 weeks delivery time E. Polipodio Riva spare shaft nut zinc anodes, supplied as anode only, for Riva shaft installations. The range includes RI006 / Trem L8113125 for models RI-1/2/3/W/X with outside diameter A Ø38 mm and height H 38 mm, and RI010 / Trem L8113135 for model RI 4/5X with outside diameter A Ø52 mm and height H 59 mm. Both versions are manufactured from zinc (ZN). Select the required replacement according to Riva model and anode dimensions.
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$ 9.77
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1-2 weeks delivery time E. Polipodio zinc Riva shaft nut anodes with brass cone, available for Ø22, Ø25, Ø30 and Ø45 mm shafts. The range uses thread sizes from 16x1.5 to 30x2, with body diameter A of 38 or 52 mm and overall height H of 65 or 88 mm depending on the selected model. The Ø22, Ø25 and Ø30 mm versions share a 38 mm body diameter and 65 mm height, while the Ø45 mm version measures 52 mm in diameter and 88 mm in height. Select the required version according to shaft diameter, thread size and overall anode dimensions.
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$ 95.10
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1-2 weeks delivery time E. Polipodio zinc spare Riva shaft nut anodes, available in three configurations covering Ø20, Ø25, Ø30, Ø35, Ø40 and Ø45 mm shafts. The Ø20–25–30 mm version measures 38 mm in diameter A and 37 mm in height H, while the Ø35–40 mm and Ø45 mm versions measure 52 mm in diameter A and 59 mm in height H. Select the required replacement anode according to shaft diameter and overall dimensions.
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$ 15.29
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1-2 weeks delivery time E. Polipodio OG058 zinc anode for Flex-Fold shaft line applications, also referenced as Trem L8119559. The anode has an overall diameter of Ø68 mm and a height of 37 mm. Manufactured from zinc (ZN) and designed specifically as an Axis Line Flex-Fold anode.
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$ 34.04
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1-2 weeks delivery time E. Polipodio zinc Axis Line Ferretti anodes, available in five configurations with Polipodio references OG006, OG007, OG007A, OG008 and OG008A and corresponding Trem references L8114040, L8114045, L8114050, L8114055 and L8114075. The range covers Ferretti models F-RA-3M/1, F-RA-3M/2, F-RA-3M/2A, F-RA-3M/3 and F-RA-3M/3A. Depending on the version, outside dimension A ranges from Ø50 to Ø74 mm, dimension B from Ø41.5 to Ø61 mm, dimension C from 35 to 55 mm and overall height H from 65 to 95 mm. All versions are manufactured from zinc (ZN).
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$ 29.90
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1-2 weeks delivery time E. Polipodio OG030 zinc anode for Ferretti shaft-line applications, corresponding to Trem L8114125 and model F-RA-3M/4. The anode has an overall diameter A of Ø155 mm, diameter B of Ø116 mm, dimension C of 132 mm and overall height H of 126 mm. Manufactured from zinc (ZN) and supplied as a dedicated Ferretti-type anode configuration.
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$ 740.80
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1-2 weeks delivery time E. Polipodio Reggiani zinc anodes for shaft-line applications, available in eight configurations from model F-RG-2 to F-RG-9. Depending on the version, overall diameter A ranges from Ø34 to Ø88 mm, dimension B from 20 to 55 mm and overall height H from 34 to 85 mm. The range corresponds to E. Polipodio references OG017, OG018, OG019, OG020, OG021, OG022, OG047 and OG056 and Trem catalogue references L8110025 through L8110060. Select the required version according to model and dimensions A, B and H.
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$ 24.28
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1-2 weeks delivery time E. Polipodio Solé zinc shaft-line anodes available in four configurations, F-SO-1 through F-SO-4. Depending on the model, outside diameter A ranges from Ø32 to Ø52 mm, lower dimension B from 24 to 41 mm and overall height H from 39 to 70 mm. The catalogue drawing specifies a Ø8 mm central opening. All versions are manufactured from zinc (ZN). Select the required model according to dimensions A, B and H.
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$ 19.96
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1-2 weeks delivery time E. Polipodio zinc spare ogive shaft nut anodes with horizontal pin, available in three configurations for shaft diameters from Ø20 to Ø45 mm. The smallest version fits Ø20, Ø22, Ø25 and Ø30 mm shafts and measures Ø38 x H38 mm with Ø1 29 mm and Ø2 8 mm. The Ø35–40 mm version measures Ø52 x H50 mm with Ø1 40 mm and Ø2 8 mm, while the Ø45 mm version measures Ø66 x H73 mm with Ø1 46 mm and Ø2 8 mm. Select the required replacement anode according to shaft diameter and dimensional configuration.
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$ 21.55
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1-2 weeks delivery time E. Polipodio zinc anodes for MTF applications, available in three dimensional configurations. OG001 / Trem L8113027, model F-MT-1, measures Ø38 mm in dimension A, Ø27 mm in dimension B and 38 mm in height. OG002 / Trem L8113035, model F-MT-2, measures Ø53 x Ø35 x 50 mm. OG003 / Trem L8113045, model F-MT-3, is the largest version with dimensions Ø65 x Ø65 x 77 mm. All variants are manufactured from zinc (ZN).
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$ 15.44
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1-2 weeks delivery time E. Polipodio RE001M20 metric threaded nut with M20 internal thread, manufactured from zinc (ZN). The rounded nut design is intended for metric threaded installations and is cross-referenced in the Trem catalogue as L8113420.
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$ 21.73
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1-2 weeks delivery time The Hollex 5959 Zinc Type V FB2 Propeller Shaft Anode is a sacrificial anode designed for marine propeller shafts with a diameter of 24.5 mm. Manufactured from zinc for saltwater applications, it features a V-model configuration with an external diameter of 58 mm and a height of 42 mm. Drawing dimensions: A Ø58 mm, E 24.5 mm and H 42 mm. The anode helps protect electrically connected shaft components against galvanic corrosion. Product number 5959, EAN 1957000012627. Supplied individually.
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$ 13.91
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1-2 weeks delivery time The Hollex 5960 Zinc Type V FB3 Propeller Shaft Anode is designed to provide sacrificial corrosion protection for marine propeller shafts in saltwater environments. Manufactured from zinc, it features a V-model configuration with a length of 40 mm, width of 24 mm and height of 24 mm. Drawing dimensions: A: 40 mm, B: 24 mm and H: 24 mm. The zinc body corrodes preferentially to help protect electrically connected metal components against galvanic corrosion. Product number 5960, EAN 1957000012634. Supplied individually.
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$ 7.16
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1-2 weeks delivery time Martyr Couach type zinc shaft end anodes for sacrificial corrosion protection of compatible propeller shaft installations. Available for shaft diameters Ø22–25 mm, Ø28–34 mm and Ø40 mm with threaded mounting sizes M16x2, M20x2.5 and M28x2.5 respectively. The range includes ANO100 at 79 g, ANO105 at 140 g and ANO110 at 216 g.
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$ 7.38
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1-2 weeks delivery time Super Marine ANO120 zinc shaft end anode for Cranchi propeller shaft installations. Designed for Ø68 mm shafts with a square fixing interface, the anode weighs 0.99 kg and has a height of 85 mm. It provides sacrificial corrosion protection for compatible marine shaft assemblies.
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$ 53.81
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1-2 weeks delivery time Super Marine zinc conical shaft nut anodes for sacrificial corrosion protection of compatible marine propeller shaft installations. Available for Ø22, Ø25 and Ø30 mm shafts with zinc weights of 0.80, 0.66 and 0.59 kg respectively. Each size is offered either as a packaged version or in bulk with mounting screws.
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$ 56.50
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1-2 weeks delivery time Super Marine zinc sacrificial anodes for Flex-O-Fold folding propellers, available in Ø56 and Ø70 mm versions. The Ø56 mm anode has a 39 mm mounting centre distance and weighs 340 g, while the Ø70 mm version has a 50 mm mounting centre distance and weighs 455 g. Both versions are designed for corrosion protection of compatible Flex-O-Fold propeller installations.
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$ 37.12
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1-2 weeks delivery time Super Marine ANO705 zinc sacrificial anode for compatible folding propeller installations. The anode has an outside diameter of 35 mm and a height of 10 mm. Manufactured from zinc and supplied in bulk for replacement of the corresponding propeller anode.
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$ 7.01
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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.