90018-Zw5-000 Flange (6X20) Bolt - Overview. The 90018-ZW5-000 Flange (6X20) Bolt is a crucial component in Honda marine engine systems. This precision-engineered flange bolt supports mounting and securing components within the engine, ensuring mechanical stability and reliable operation. Designed according to factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM flange bolt designed for Honda marin