94102-12200 Washer, Plain (12mm) - Overview. The 94102-12200 washer, plain (12mm) is a fundamental component in Honda marine engine systems supporting connection and mounting roles within mechanical assemblies. This flat washer provides an even surface to distribute load pressure evenly across bolt heads and nuts, protecting parts from damage and wear over time. Used widely in rigging and mechanical fastening applications, it ensures parts maintain secure, stable assemblies for reliable operatio