90303-ZW1-B02 Hex (16mm) Nut - Overview. The 90303-ZW1-B02 Hex (16mm) Nut is a vital component within Honda marine engine systems. This OEM nut serves as a robust fastening solution, critical for securing various engine or hull components, supporting the overall mechanical integrity and reliability of your marine equipment. Designed to meet exact Honda factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Preci