90109-ZW1-003 Hex Bolt - Overview. The 90109-ZW1-003 Hex Bolt is a critical fastening component in Honda marine engine systems. This hex bolt supports the structural integrity by securely holding engine parts together, ensuring reliability and durability in demanding marine environments. Manufactured to Honda's exact factory specifications, it guarantees seamless integration with existing hardware, maintaining optimal performance and longevity.. Key Features. Durable hexagonal bolt designed spec