90303-ZY3-000 Hex (18mm) Nut - Overview. The 90303-ZY3-000 Hex (18mm) Nut is a crucial fastener designed to support Honda marine engine systems. This nut plays a vital role in securing components, ensuring the stability and reliability of your marine equipment. Precisely manufactured to OEM standards, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Hexagonal nut with 18mm size designed specifically for Honda marine applications.. Genuine OEM component ensuring exact fit, dimensions, and tolerances.. Essential for securing various engine and rigging components.. Manufactured to meet Honda's stringent quality and performance standards.. Enhances the overall reliability and durability of marine engine assemblies.. Integrates cleanly with factory hardware and seals for dependable service.. Why Choose Genuine OEM. Using original Honda parts like the 90303-ZY3-000 Hex (18mm) Nut preserves the integrity of your marine engine.