90502-ZZ5-M00 Spring (5mm) Washer - Overview. The 90502-ZZ5-M00 Spring (5mm) Washer is a precision-engineered component designed to support Honda marine engine systems, particularly in the rigging and accessory assemblies. This spring washer plays a crucial role in maintaining the tension of fasteners, preventing loosening due to vibration or shock, thus ensuring your equipment operates reliably and smoothly. Its role in the mechanical system is fundamental for keeping assemblies secure during o