90021-ZW5-U00 Bolt (6X220) - Overview. The 90021-ZW5-U00 Bolt (6X220) is a critical component within Honda marine engine systems. Specially crafted as a genuine Honda OEM part, this bolt is designed for a secure fastening role, ensuring that various engine and rigging components are held firmly in place. Its precision dimensions (6mm diameter by 220mm length) and factory-matched tolerances make it essential for maintaining the mechanical integrity and reliable operation of Honda marine equipment