90311-ZW1-003 Self-Lock Nut - Overview. The 90311-ZW1-003 Self-Lock Nut is a critical hardware component within Honda marine engine systems. It supports the rigging and accessory hardware systems by providing secure, vibration-resistant fastening that ensures components remain tightly joined under marine operating conditions. Manufactured to factory specifications, this self-locking nut helps maintain overall engine reliability by preventing loosening caused by vibration or movement, ensuring se