90305-ZW1-V01 Hex (12Mm) Nut - Overview. The 90305-ZW1-V01 Hex (12Mm) Nut is an essential component in Honda marine engine systems. This 12mm hexagonal nut supports the rigging and hardware system by securely fastening parts and assemblies together, ensuring reliable mechanical connections and maintaining the integrity of the equipment during operation. Built to Honda factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key