90121-ZV0-000 Flange (6X25) Bolt - Overview. The 90121-ZV0-000 Flange (6X25) Bolt is an essential fastening component used in Honda marine engine systems. This flange bolt supports secure mounting of marine engine parts, ensuring optimal mechanical integrity and system reliability. By maintaining precise factory specifications, dimensions, and tolerances, this bolt guarantees seamless integration within Honda marine applications and contributes to the overall durability and performance of your m