90021-ZV7-003 Bolt (6x20) - Overview. The 90021-ZV7-003 Bolt (6x20) is a critical fastening component designed specifically for Honda marine engine systems. This bolt plays an essential role in securing various components within the engine assembly, contributing to the reliable operation and structural integrity of the marine power system. Manufactured to meet Honda's rigorous factory specifications, the bolt ensures seamless integration with existing parts, maintaining optimal performance and d