90109-ZVD-000 Special (8x20) Bolt - Overview. The 90109-ZVD-000 Special (8x20) Bolt is a crucial component within Honda marine engine systems, designed to provide reliable and durable fastening solutions for specialized applications. It supports critical system functions by ensuring mechanical stability and secure assembly of specific engine parts. This bolt plays a vital role in maintaining overall equipment reliability and performance. Engineered to exact factory specifications and tolerances,