90024-ZW9-030 Special (8mm) Bolt - Overview. The 90024-ZW9-030 Special (8mm) Bolt is a crucial fastening component used in Honda marine engine systems. This specially designed bolt supports various mechanical systems, particularly in Honda's marine applications, ensuring secure assembly and maintaining the integrity of the engine and rigging components. Manufactured to meet factory specifications and tolerances, it ensures seamless integration with existing parts, maintaining optimal performance