94021-06020 Nut Cap (6mm) - Overview. The 94021-06020 Nut Cap (6mm) is a critical fastening component within Honda marine engine systems. This genuine OEM part functions as a protective and secure cap nut, primarily used in rigging and accessory assemblies to maintain the integrity of the system and prevent exposure of threaded components. Designed to integrate seamlessly with existing hardware, it maintains optimal performance and durability in demanding marine environments.. Key Features. Stan