90242-ZW1-000 Lock (64Mm) Nut - Overview. The 90242-ZW1-000 Lock (64Mm) Nut is a specialized locking fastener integral to Honda marine engine systems. This essential locking nut secures key components, ensuring mechanical stability and preventing loosening from vibration or torque. Designed specifically for compatibility with Honda marine engines, the lock nut plays a vital role in reliable operation and maintaining structural integrity during marine use. Manufactured to meet stringent factory s