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Vetus ZINKAS25C Shaft Collar Zinc Anode Ø25 mm
The Vetus ZINKAS25C is a precision-engineered shaft collar zinc anode developed for effective cathodic protection of propeller shafts with a diameter of 25 mm. Shaft anodes are exposed to continuous water flow and mechanical stress; therefore, Vetus designs these anodes to ensure a perfect fit and secure retention throughout their service life. The ZINKAS series incorporates an interlock system in both halves, guaranteeing exact alignment and preventing the anode from loosening, even as material is consumed.
This anode is manufactured from high-purity zinc in accordance with MIL-A-18001K specifications, ensuring predictable electrochemical performance in saltwater and brackish environments. Shaft anodes are not recommended for high-speed vessels, as they may create turbulence around the propeller and, during erosion, can introduce imbalance. For such applications, a propeller nut with integrated anode is preferred. For conventional propulsion systems, the ZINKAS25C provides dependable protection against galvanic corrosion of the shaft.
Key Features
- Split shaft collar zinc anode for Ø25 mm shafts
- Manufactured to MIL-A-18001K specification
- Integrated interlock system for perfect alignment
- Secure two-bolt fastening
- Designed to remain fixed even during erosion
Technical Specifications
Parameter Value Product Code ZINKAS25C Anode Material Zinc (MIL-A-18001K) Anode Type Shaft collar anode Shaft Diameter 25 mm Outer Diameter 56–58 mm Height 56 mm Number of Bolts 2 Weight 0.50–0.51 kg
Application Parameters
- Cathodic protection of propeller shafts
- Recommended for saltwater and brackish environments
- Designed for standard-speed propulsion systems
- Split design allows installation without shaft removal
- Recommended inspection annually and replacement at 50% wear
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