90004-ZW9-000 Flange (6X28) Bolt - Overview. The 90004-ZW9-000 flange (6x28) bolt is a critical fastening component used primarily in Honda marine engine systems. This flange bolt plays a crucial role in securing engine parts, ensuring they remain tightly connected to withstand the rigors of marine environments. Engineered to Honda's factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely designed flang