90123-ZV5-010 Hex (10X40) Bolt - Overview. The 90123-ZV5-010 Hex (10X40) Bolt is an essential component designed specifically for Honda marine engine systems. This bolt plays a critical role in securely fastening parts within the engine assembly to maintain structural integrity and reliable operation. Engineered to precise factory specifications, the 10mm by 40mm hex bolt ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM