90123-ZY3-000 Hex (12x45) Bolt - Overview. The 90123-ZY3-000 Hex (12x45) Bolt is a critical fastener used within Honda marine engine systems. Serving as a hex bolt with dimensions 12x45 mm, this genuine OEM part supports mechanical connections by securely fastening components to maintain the structural integrity of the engine and rigging assemblies. Designed specifically for Honda marine applications, it ensures seamless integration with existing parts, maintaining optimal performance and durabi