90502-ZZ5-M01 Spring (5mm) Washer - Overview. The 90502-ZZ5-M01 Spring (5mm) Washer is a critical component within Honda marine engine systems, supporting various rigging and fastening applications to enhance overall system reliability. Specifically engineered for Honda marine engines, this 5mm spring washer plays a vital role in securing assemblies by providing tension and preventing loosening due to vibrations and mechanical forces. Designed to exact factory specifications, the washer ensures