90120-ZV4-010 Hex (6x40) Bolt - Overview. The 90120-ZV4-010 Hex (6x40) Bolt is a critical fastening component designed specifically for Honda marine engine systems. This hex bolt plays an essential role in securing parts within the engine assembly, ensuring reliable operation and structural integrity. Manufactured to meet exact factory specifications, it seamlessly integrates with existing hardware to maintain optimal performance and durability of the marine engine.. Key Features. Genuine OEM he