90108-881-000 Hex (6x28) Bolt - Overview. The 90108-881-000 Hex (6x28) Bolt is a critical fastening component designed specifically for Honda marine engine systems. This hex bolt secures essential parts within the engine assembly to ensure the system remains reliably operational under marine conditions. Manufactured to fit perfectly within Honda marine equipment, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This hex bolt serv