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 Radice hexagonal-type propeller sacrificial anodes for fixed pitch propeller installations, supplied complete with a brass plug. The range includes standard and non-standard configurations for shaft sizes from Ø22–25 mm up to Ø70/100 mm, with weights from 0.27 to 6.90 kg. Standard versions use the corresponding metric brass plug thread, while non-standard versions include alternative metric threads, Whitworth threads and Ø hole configurations. Available models range from 18 to 46 mm in h dimension, 18 to 54 mm in h1 dimension and from Ø37 to Ø100 mm in overall diameter. Select the required version according to shaft size, m configuration, dimensions and weight.
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$ 77.65
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1-2 weeks delivery time Tecnoseal zinc Beneteau propeller anodes supplied complete with brass plug, available for shaft sizes from Ø22–25 to Ø50 mm. The range covers body diameters from Ø37 to Ø75 mm, h dimensions from 20 to 30 mm, h1 dimensions from 18 to 33 mm and metric threads from 16x1.5 to 36x3. Individual weights range from 0.30 to 2.29 kg. Select the required version according to shaft diameter, body dimensions and thread size.
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$ 64.40
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1-2 weeks delivery time Tecnoseal stainless steel washers for fastening Radice propeller anodes, available in nine sizes for shaft diameters from 22–25 mm up to 70–100 mm. The range includes washers with Ø1 outside diameters from 38 to 100 mm, Ø2 dimensions from 16 to 50 mm and c dimensions from 6 to 20 mm. Weights range from 0.005 to 0.05 kg. Select the required washer according to shaft size and Ø1, Ø2 and c dimensions.
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$ 7.57
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1-2 weeks delivery time Tecnoseal aluminium UK Type disc sacrificial anodes with steel insert for rudders and trim tabs, supplied individually without mounting hardware. The range includes 00101UKAL with Ø70 × 33 mm dimensions and 170 g weight, 00102UKAL with 98 × 82 × 32 mm dimensions and 400 g weight, and 00105UKAL with Ø148 × 36 mm dimensions and 860 g weight. Depending on the model, Ø1 ranges from 30 to 42 mm and Ø2 from 11 to 14.5 mm.
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$ 19
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1-2 weeks delivery time Tecnoseal aluminium Scandinavian Type bolt-on sacrificial anodes with mounting strap, available in weights from 150 g to 2.40 kg. The range includes multiple body and strap configurations with body lengths from 75 to 260 mm, widths from 34 to 96 mm, heights from 16 to 46 mm, overall dimension i from 117 to 315 mm and mounting slots from 7 × 25 to 13 × 35 mm. Select the required model according to body dimensions, mounting-slot size, overall dimension i and strap dimensions.
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$ 19.62
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1-2 weeks delivery time Tecnoseal aluminium Oval Type bolt-on sacrificial anodes with integrated mounting strap and slotted fixing holes. The range includes seven models weighing from 0.46 to 2.50 kg, with anode body dimensions from 100 × 60 × 18 mm to 300 × 80 × 40 mm, mounting dimension i from 200 to 355 mm and slotted holes from 12 × 20 to 13 × 40 mm. Strap sizes range from 240 × 25 × 5 mm to 400 × 30 × 6 mm. Select the required version according to body dimensions, mounting dimension, slot size and strap dimensions.
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$ 48.19
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1-2 weeks delivery time Tecnoseal aluminium Teardrop Type bolt-on sacrificial anodes with integrated mounting strap and slotted fixing holes. The range includes five models weighing from 0.54 to 1.30 kg, with anode body dimensions from 120 × 78 × 25 mm to 160 × 100 × 40 mm, mounting dimension i of 200 or 220 mm and slotted holes of 13 × 25 or 13 × 35 mm. Strap sizes are 250 × 25 × 5 mm or 255 × 25 × 5 mm. Select the required version according to body dimensions, mounting dimension i, slot size and strap dimensions.
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$ 43.67
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1-2 weeks delivery time Tecnoseal aluminium large disc sacrificial anodes with steel insert for hull and transom applications. The range includes seven models with outside diameters from Ø150 to Ø230 mm, heights from 25 to 35 mm and weights from 1.30 to 3.80 kg. Central mounting hole diameters are Ø14 or Ø16 mm depending on the model. Select the required version according to outside diameter, height, central hole diameter and anode weight.
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$ 218.89
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1-2 weeks delivery time Tecnoseal aluminium stern disc sacrificial anodes for stern applications, available either as anode only without insert or as complete kits with mounting components. The range covers Ø125 and Ø140 mm outside diameters, heights from 30 to 38 mm and weights from 1.00 to 1.60 kg depending on size and supply configuration. All versions feature Ø1 50 mm, Ø2 14.5 mm and Ø3 48 mm dimensions. Complete kits include the corresponding aluminium stern disc anode together with 00153-PERNOCOMPLETO / nut, PP cap and pad. Tecnoseal 00140AL corresponds to Osculati 43.210.12 and Tecnoseal 00131AL corresponds to Osculati 43.210.13. Select the required version according to diameter, height, weight and supply configuration.
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$ 92.08
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1-2 weeks delivery time Tecnoseal aluminium stern disc sacrificial anodes supplied as anode only, without insert. The range includes four models with outside diameters from Ø100 to Ø145 mm, heights from 25 to 40 mm and weights from 0.74 to 1.80 kg. Available versions feature Ø1 dimensions of 38 or 40 mm and Ø2 mounting-hole diameters from 10 to 12.5 mm. Select the required model according to outside diameter, height, mounting dimensions and weight.
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$ 70.39
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1-2 weeks delivery time Tecnoseal aluminium Baglietto-type stern disc sacrificial anodes with steel insert for stern applications, available in two supply configurations. Tecnoseal 00152AL is supplied as anode only with PP cap and weighs 1.53 kg, while Tecnoseal 00153AL is supplied as a complete 1.76 kg kit comprising 00152AL together with 00153-PERNOCOMPLETO / nut, PP cap and pad. Both versions measure Ø135 x 47 mm and share dimensions a 35 mm, b 9 mm, Ø1 50x3 mm, Ø2 32 mm and Ø3 14.5 mm.
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$ 220.59
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1-2 weeks delivery time Tecnoseal 00154AL aluminium Baglietto-type stern disc sacrificial anode with steel insert, supplied as anode only. The anode measures Ø120 x 35 mm and weighs 0.89 kg. Technical dimensions are Ø1 50x3 mm, Ø2 32 mm and Ø3 14 mm.
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$ 151.74
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1-2 weeks delivery time Tecnoseal aluminium Vetus-type oval plate bolt-on sacrificial anodes for hull and transom applications. The range includes five models from 98 to 350 mm in length, 44 to 68 mm in width and 18 to 36 mm in height, with weights from 0.13 to 1.85 kg. Tecnoseal 00220-0AL, also referenced as Osculati 43.902.10, is the compact 98 x 44 x 18 mm version with 48.5 mm hole centres and Ø10.5 mm mounting holes. The larger models feature hole-centre distances from 80 to 200 mm, with Ø1 dimensions of 31–38 mm and slotted Ø2 mounting holes of 11x15 or 13x25 mm. Tecnoseal 00220AL corresponds to Osculati 43.902.20 and original part number ALU15C; 00221AL corresponds to Osculati 43.902.21 and ALU25C; and 00223AL corresponds to Osculati 43.902.22 and ALU35C.
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$ 26.47
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1-2 weeks delivery time Tecnoseal aluminium Vetus-Type profiled bar bolt-on sacrificial anodes for hull and transom applications. The range includes two models with lengths of 152 and 250 mm and weights of 0.53 and 1.30 kg. Tecnoseal 03510AL features 80 mm hole centres and overall dimensions of 152 x 68 x 23 mm, while 03511AL features 140 mm hole centres and overall dimensions of 250 x 75 x 29 mm. Both versions use Ø1 11 mm mounting holes with Ø2 11x15 mm recess dimensions. Select the required model according to overall dimensions, hole-centre distance and weight.
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$ 56.47
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1-2 weeks delivery time Tecnoseal aluminium UK-Type bolt-on bar sacrificial anodes for Fairline hull and transom applications, available in two configurations. Tecnoseal 00269E/AL measures 200 x 65 x 32 mm, weighs 0.55 kg and features 110 mm hole centres with Ø12 mm mounting holes. Tecnoseal 00270EAL measures 320 mm in length and 65 mm in width, weighs 1.00 kg and features 160 mm hole centres, 33 mm height, b 92 mm and c 12x65 mm mounting dimensions. Select the required model according to overall dimensions, hole-centre distance and weight.
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$ 53.71
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1-2 weeks delivery time Tecnoseal aluminium UK-Type bolt-on bar sacrificial anodes for Fairline hull and transom applications, available in two sizes. Tecnoseal 00271EAL measures 310 x 75 x 40 mm, weighs 1.75 kg and features 205 mm hole centres, b 35 mm and c 13x25 mm mounting dimensions. Tecnoseal 00272EAL measures 455 x 94 x 40 mm, weighs 2.75 kg and features 230 mm hole centres, Ø 19x30 mm and Ø1 70 mm mounting dimensions. Select the required model according to overall dimensions, mounting configuration, hole-centre distance and weight.
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$ 158.18
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1-2 weeks delivery time Tecnoseal 00273EAL aluminium UK-Type bolt-on bar sacrificial anode for Sunseeker hull and transom applications. The anode measures 450 x 105 x 50 mm, weighs 4.04 kg and features 230 mm hole centres. Mounting dimensions are Ø 19x30 mm with Ø1 70 mm. Select this model where the overall dimensions and mounting configuration match the existing installation.
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$ 276.07
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1-2 weeks delivery time Tecnoseal 03503AL aluminium Vetus-Type conical plate sacrificial anode for hull and transom applications. The anode measures Ø79 x 45 mm and weighs 0.41 kg. Technical dimensions include Ø1 11 mm, Ø2 46 mm and Ø3 34 mm. Select this model where the overall diameter, height and mounting dimensions match the existing installation.
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$ 55.43
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1-2 weeks delivery time Tecnoseal magnesium UK Type disc sacrificial anodes with steel insert for rudders and trim tabs, supplied individually without mounting hardware. The range includes 00101UKMG with Ø70 × 33 mm dimensions and 110 g weight, 00102UKMG with 98 × 82 × 32 mm dimensions and 250 g weight, and 00105UKMG with Ø148 × 36 mm dimensions and 550 g weight. Depending on the model, Ø1 ranges from 30 to 42 mm and Ø2 from 11 to 14.5 mm.
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$ 28.64
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1-2 weeks delivery time Tecnoseal magnesium Scandinavian Type bolt-on sacrificial anodes with mounting strap, available in four sizes from 140 to 700 g. The range includes body dimensions from 75 × 34 × 16 mm to 140 × 82 × 26 mm, overall dimension i from 132 to 180 mm, mounting slots of 9 × 20 or 13 × 35 mm and strap sizes from 170 × 20 × 3 to 255 × 25 × 5 mm. Select the required model according to body dimensions, mounting-slot size, overall dimension i and strap dimensions.
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$ 65.61
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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.