90020-ZVD-000 Bolt, Special (6Mm) - Overview. The 90020-ZVD-000 Bolt, Special (6Mm) is a specialized fastener designed for Honda marine engine systems. It plays a crucial role in securing components within the marine engine system, ensuring that structural and mechanical parts remain firmly in place to maintain reliable operation in demanding marine environments. Precision manufactured for Honda marine applications, it ensures seamless integration with existing parts, maintaining optimal perform