90302-ZW5-003 Flange (12Mm) Nut - Overview. The 90302-ZW5-003 Flange (12Mm) Nut is a critical fastening component used in Honda marine engine systems. It plays a vital role in securely joining parts together while distributing load evenly through its flanged surface. This nut is designed to maintain the integrity and reliability of the marine engine system by ensuring that connections remain firm under varying conditions. Its compatibility with Honda marine applications guarantees seamless integ