94001-05020-0S Hex (5mm) Nut - Overview. The 94001-05020-0S Hex (5mm) Nut is a critical hardware component in Honda marine engine systems. This hexagonal nut plays a vital role in securing various assemblies, contributing to the reliable operation and integrity of your marine engine setup. Engineered to meet exact Honda specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This is a genuine Honda OEM hex nut with a 5mm