90018-ZZ5-M01 Flange (6X20) Bolt - Overview. The 90018-ZZ5-M01 Flange (6X20) Bolt is a crucial component within Honda marine engine systems. It plays an essential role in securely fastening parts to maintain system integrity and reliable operation. Engineered with precise dimensions, this flange bolt ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine Honda OEM bolt designed specifically for marine use, assuring quality and rel