90004-ZW5-000 Special (8X16) Bolt - Overview. The 90004-ZW5-000 Special (8X16) Bolt is a critical fastening component tailored for Honda marine engine systems. It plays an essential role in securing specific parts to ensure reliable operation of marine engines. Designed with precision engineering, this bolt supports structural integrity and longevity under the demanding conditions of marine environments. Its design enables seamless integration with existing hardware, maintaining optimal durabili