Anti-Corrosion Washers

The NOCO Anti-Corrosion Washers (SKU NOCB603) are engineered fastening components built specifically for the marine environment where saltwater, humidity, and constant moisture attack every metal surface. After years of running boats from coastal inlets to freshwater lakes, any serious boater knows that standard fasteners corrode within weeks—leading to seized bolts, rust streaking, and compromised structural integrity on critical components. These washers solve that problem by creating a protective barrier between fastener heads and metal surfaces, dramatically extending the service life of everything from battery terminals to engine mounts.

NOCO's anti-corrosion formula employs advanced materials and surface treatment that resist salt spray, oxidation, and electrochemical degradation—the primary failure modes for traditional washers in saltwater conditions. Unlike bare steel or low-grade stainless alternatives, these washers maintain their protective properties even when exposed to repeated wet-dry cycles and temperature swings common aboard working vessels. The design distributes load evenly while the corrosion-resistant coating prevents galvanic action between dissimilar metals, a critical consideration when fastening aluminum hulls, bronze through-hulls, or steel frameworks in close proximity.

These washers are essential for boaters installing or maintaining electrical systems, through-hull fittings, railings, cleats, and any structural fastener exposed to the marine environment. Both saltwater and freshwater anglers benefit from their extended corrosion resistance—particularly those who trailer boats regularly or moor in humid climates where galvanic corrosion accelerates. The compact 3.75 x 3.7 x 3.9 inch package weighs just 0.48 lbs, making it easy to stock spares onboard for routine maintenance and repairs that keep your vessel seaworthy season after season.