B & S Anodes Collar Zinc Anode

B & S Anodes Collar Zinc Anodes, also called donut collar zincs or shaft zincs, are sacrificial anodes that protect propeller shafts and the metal parts around them from galvanic corrosion. When different metals sit in salt water, the less noble one corrodes first. The zinc collar is designed to corrode in its place, which helps protect your shaft, propeller, and other underwater metal.

Key Features:

• Zinc alloy construction: cast from zinc alloy that meets Military Specification MIL-A-18001K
• Hand-poured in the U.S.A.: B&S has been making its anodes this way for over 50 years
• Donut collar design: the collar mounts directly on the propeller shaft
• Salt water use: zinc alloy is intended for salt water environments
• Range of shaft sizes: each variant in the line is sized to match a specific shaft diameter

B&S says hand-poured zinc is more porous than die-cast zinc. That gives it more surface area exposed to corrosion for a given size. These collar zincs are a good choice for boat owners who want a replacement shaft anode for recreational or commercial vessels. Choose the variant that matches your shaft diameter.