Metal Guide

Al
Suitable for salt & fresh water
Mg
Suitable for fresh water
Zn
Suitable for salt water

Follow our colour coding for easy identification of metals.

How To Fit Shaft AnodesHow To Fit Shaft Anodes

Magnesium Shaft Collar Anodes

If you sail in fresh water, you'll need a Magnesium shaft collar anode, as there is lower open circuit potential in fresh water. In addition, unlike zinc shaft collar anodes and aluminium shaft collar anodes, magnesium anodes react rapidly when exposed to seawater, which is why they should only be used in fresh water. 

Typically located near the propeller of the boat, shaft collar anodes are used to prevent the propeller from sliding along the shaft. The collar anode works in the same way as a regular shaft anode; it attracts and neutralizes any stray electrical current that may be present in the water, protecting the shaft and the collar from corrosion.

Why shop with Anode Outlet?

Since 2009 we've been supplying a leading range of magnesium anodes to boat owners around the world, including magnesium engine anodes, magnesium sterndrive anodes and magnesium saildrive anodes. Our superb range of anodes are manufactured in Italy to US MIL specifications, giving you that added quality assurance.

If you have any questions about any of our anodes for sale - our highly experienced team love to share their expertise, and are here to help! Call us on 01634 568011 or send an email to info@anodeoutlet.co.uk, and we'll be more than happy to assist. All our orders are shipped on a fully tracked, next working day service (subject to stock availability), but if your order is urgent, please contact us before placing an order.