90019-881-000 Bolt Hex (8X55) - Overview. The 90019-881-000 Bolt Hex (8X55) is a crucial fastening component designed for Honda marine engine systems. It serves the essential role of securely assembling and mounting various engine parts, ensuring reliable and stable operation. This bolt features a hexagonal head with dimensions of 8x55mm, matching factory specifications for exact fit and function. Manufactured to integrate seamlessly with existing parts, it maintains the optimal performance and