90016-ZW9-000 Flange (6X25) Bolt - Overview. The 90016-ZW9-000 flange (6X25) bolt is a specialized component designed to support Honda marine engine systems. As a critical fastening element, it contributes to the secure assembly and structural integrity of various engine components. Manufactured to precise factory specifications, this bolt ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. 6mm diameter by 25mm length flange bolt engin