90302-ZVA-000 Hex (6mm) Nut - Overview. The 90302-ZVA-000 Hex (6mm) Nut is a critical fastening component used in Honda marine engine systems. This hexagonal nut functions to securely fasten parts and components together, supporting the structural integrity and reliable operation of the marine engine system. Specifically designed for compatibility with Honda marine applications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. He