Tecnoseal 00100 Series Standard Disc Rudder Anode

Tecnoseal 00100 Series standard disc rudder anodes provide sacrificial cathodic protection for compatible rudders, trim tabs and other electrically connected underwater metal components. This combined listing covers six circular sizes from Ø50mm to Ø140mm, with zinc, aluminium and magnesium versions of every size. Select the complete disc geometry first, then choose the alloy specified for the vessel's operating water and cathodic-protection system.

What Is This Disc Anode Used For?

The anode mounts against a suitable rudder, trim tab or other underwater metal component through its centre fixing. When installed with the required direct electrical continuity, the sacrificial alloy is consumed in preference to the connected underwater metalwork.

Some installations use one disc, while others use two matching discs on opposite faces of the protected component. Confirm the original arrangement before ordering and replace paired positions with matching sizes and alloys where required.

Key Features

• Brand: Tecnoseal
• Product category: Standard marine disc rudder / trim-tab anode
• Model families: 00100, 00101, 00102, 00103, 00104 and 00105
• Available alloys: Zinc, aluminium and magnesium
• Number of variants: 18
• Outside-diameter range: Ø50mm to Ø140mm
• Mounting: Centre fixing
• Applications: Compatible rudders, trim tabs and connected underwater metalwork
• Selection method: Match outside diameter, overall height, centre recess, fixing-hole diameter and alloy
• Manufacture: Made in Italy by Tecnoseal

Available Sizes and Part Numbers

• 00100 family: Ø50mm × 11mm, Ø20mm centre recess and Ø6.5mm fixing hole. Available as 00100 zinc, 00100AL aluminium and 00100MG magnesium.
• 00101 family: Ø70mm × 13mm, Ø22mm centre recess and Ø8.5mm fixing hole. Available as 00101 zinc, 00101AL aluminium and 00101MG magnesium.
• 00102 family: Ø90mm × 17mm, Ø31mm centre recess and Ø8.5mm fixing hole. Available as 00102 zinc, 00102AL aluminium and 00102MG magnesium.
• 00103 family: Ø110mm × 18mm, Ø31mm centre recess and Ø10.5mm fixing hole. Available as 00103 zinc, 00103AL aluminium and 00103MG magnesium.
• 00104 family: Ø125mm × 21mm, Ø31mm centre recess and Ø10.5mm fixing hole. Available as 00104 zinc, 00104AL aluminium and 00104MG magnesium.
• 00105 family: Ø140mm × 30mm, Ø33mm centre recess and Ø12.5mm fixing hole. Available as 00105 zinc, 00105AL aluminium and 00105MG magnesium.

How Do I Select the Correct Size?

Measure the existing anode and mounting arrangement before ordering. Confirm:

• Outside diameter: Ø50mm, Ø70mm, Ø90mm, Ø110mm, Ø125mm or Ø140mm.
• Overall height: The casting thickness must match the available clearance and original profile.
• Centre recess: The recessed seating diameter must match the existing installation.
• Fixing hole: Confirm the centre-hole diameter and the specified mounting hardware.
• Mounting arrangement: Check whether the component uses one anode or a matched pair.
• Electrical contact: The installation must retain the direct continuity required by the vessel's cathodic-protection design.

Do not select a replacement from outside diameter alone. Several sizes share the same centre-recess diameter but use different heights or fixing-hole diameters.

Important Product-Family Distinction

This listing covers the standard 00100–00105 Series. It does not cover the heavy-duty UK-pattern 00101UK, 00102UK or 00105UK anodes. For example, standard 00101 measures Ø70mm × 13mm with a Ø22mm recess and Ø8.5mm hole, while 00101UK measures Ø70mm × 33mm with a Ø30mm recess and Ø11mm hole. Match the complete part number and dimensions before ordering.

Which Anode Alloy Should I Choose?

• Zinc: A conventional selection for salt-water operation where zinc is specified.
• Aluminium: Generally selected for salt or brackish water and lower in mass than an equivalent zinc casting.
• Magnesium: Generally selected for fresh-water operation and normally unsuitable for prolonged salt-water use because it may be consumed too quickly.

Use the alloy specified by the vessel, equipment or cathodic-protection-system manufacturer. Keep the alloy consistent with the vessel's existing protection system unless a qualified marine-corrosion specialist specifies otherwise. Water salinity, connected metals, shore-power arrangements, bonding condition and stray-current activity can affect the correct selection.

Installation and Maintenance

Remove the old anode and clean the disc seating face, centre fixing and required electrical-contact surfaces to clean bare metal. Fit the replacement with suitable serviceable hardware and follow the vessel or equipment manufacturer's tightening procedure.

Do not paint the sacrificial casting or its required contact surfaces. Inspect the anode during scheduled servicing and replace it when substantially consumed, cracked, damaged or loose. Unusually rapid or uneven consumption can indicate incorrect alloy selection, poor electrical continuity, bonding faults or stray-current activity.

Alloy Standards and Manufacture

Tecnoseal manufactures zinc, aluminium and magnesium sacrificial anodes at its foundry in Grosseto, Tuscany, and checks alloy composition through spectrometric measurement against the applicable specification:

• Zinc alloy: US Mil Spec A-18001K
• Aluminium alloy: US Mil Spec A24779 SH
• Magnesium alloy: US Mil Spec A21412 SH

Frequently Asked Questions

• Is the outside diameter the only measurement that matters? No. Match the height, centre-recess diameter and fixing-hole diameter as well.
• Are standard 00101 and heavy-duty 00101UK interchangeable? No. They share a nominal Ø70mm outside diameter but have different heights, recesses, fixing holes and weights.
• Do zinc, aluminium and magnesium versions of the same base model share the same dimensions? Yes. Variants within each base family use the listed nominal geometry, but their weights differ because the alloys have different densities.
• Can I change from zinc to aluminium or magnesium? Only where the alternative alloy is appropriate for the operating water and compatible with the vessel's complete cathodic-protection system.
• Can the anode be painted? No. Keep the sacrificial alloy and required electrical-contact surfaces free from paint, grease and insulating sealant.
• Is mounting hardware included? Do not assume that bolts, nuts or washers are included unless the selected product offer specifically states this.
• Should opposed disc anodes be replaced together? Where the installation uses two matching discs, inspect both and normally renew them together using the same size and alloy.

Specifications

Specification note: Dimensions and current catalogue weights are taken from Tecnoseal's live 00100 Series data. The full-size selector combines outside diameter, overall height, centre-recess diameter and fixing-hole diameter to reduce selection errors.

Specification note: Dimensions and current catalogue weights are taken from Tecnoseal's live 00100 Series data. The full-size selector combines outside diameter, overall height, centre-recess diameter and fixing-hole diameter to reduce selection errors.