These Zinc Rudder & Trim Tab Anodes are available in sizes extra small, small, medium, large and extra large. Manufactured to Mil-Spec standards these zinc anodes can be installed on rudders, trim tabs, struts or other flat areas.  Each Unit is designed with an encapsulated nut which prevents fallout. Here are the sizes of the machine screw depending on the mount size.

  1. Extra small mounts with 10-24X1″ machine screw.
  2. Small mounts with 1/4″-20X1-3/4″ machine screw.
  3. Medium mounts with 1/4″-20X2” machine screw.
  4. Large mounts with 5/16″-18X2″ machine screw.