90150-ZW4-000 Flange (8X18) Bolt - Overview. The 90150-ZW4-000 Flange (8X18) Bolt is a crucial component specifically designed for Honda marine engine systems. This flange bolt plays an essential role in securing and mounting various parts within the engine assembly, ensuring the mechanical stability necessary for optimum marine performance. With precise dimensions measuring 8mm in diameter and 18mm in length, the bolt guarantees seamless integration with existing parts, maintaining optimal perf