90303-ZV7-000 Special (10Mm) Nut - Overview. The 90303-ZV7-000 Special (10Mm) Nut is a vital hardware component used in Honda marine engine systems. Designed to provide secure fastening within the engine assembly, this specialized 10mm nut plays a critical role in maintaining the mechanical integrity and reliability of your boat's marine engine. Engineered for seamless integration with existing parts, it ensures optimal performance and durability by meeting strict factory specifications and tole