Tecnoseal R5 Rudder Anode - Zinc - 5" Diameter x 7/8" Thickness

The Tecnoseal R5 Rudder Anode in zinc is a critical marine corrosion-protection component designed for saltwater and brackish environments where metal hulls, rudders, and appendages face constant electrolytic attack. This 5" diameter x 7/8" thickness anode sacrifices itself to protect your vessel's steel and aluminum structures, absorbing corrosive seawater chemistry so your rudder hardware remains intact. Boat owners, marine repair facilities, and commercial fishing operations rely on quality rudder anodes to extend the service life of expensive maritime assets and avoid costly underwater damage.

Constructed from pure zinc, the Tecnoseal R5 is engineered to function as a galvanic anode in the electrochemical protection system standard on modern vessels. Zinc's electrochemical potential makes it more negative than steel and aluminum, causing it to corrode preferentially while leaving primary structures unharmed—a process called cathodic protection. The anode's full-size profile and 4.41 lb weight ensure sufficient surface area and mass for extended service intervals in harsh offshore conditions. Each unit includes a stainless steel hex nut and socket cap screw for secure installation, and the captive hex nut design eliminates dropped fasteners during underwater mounting—a practical feature that saves time and frustration during routine maintenance.

This rudder anode suits vessels ranging from commercial fishing boats and offshore supply ships to large recreational yachts and naval applications operating in seawater. Installation requires straightforward bolt-on mounting to existing rudder studs or brackets; no welding or complex fabrication needed. Tecnoseal's R5 specification is a proven OEM replacement for many major shipbuilders and is compatible with standard marine fastening systems. Plan for replacement every 3–5 years depending on water salinity, vessel speed, and environmental conditions—regular inspection ensures your cathodic protection system remains effective and your rudder assembly stays corrosion-free.