90155-ZW4-000 Flange (8X40) Bolt - Overview. The 90155-ZW4-000 Flange (8X40) Bolt is an essential fastening component in Honda marine engine systems. This flange bolt, designed specifically for the Honda Active Marine series, plays a critical role in securing engine parts with its 8mm diameter and 40mm length. Its flange head provides increased surface contact and clamping force, ensuring the bolt maintains a reliable and secure fit. Manufactured to match factory specifications and tolerances, i