90185-22043-00 – NUT, SELF-LOCKING – Yamaha

The 90185-22043-00 Yamaha nut is a self-locking nut used on Yamaha outboard engines as part of various mounting and hardware assemblies. This locking nut secures components where vibration and engine movement can loosen ordinary nuts. Many outboard systems use self-locking nuts on gearcases, brackets, and linkage fittings to help maintain tight mechanical connections.

This 90185-22043-00 Yamaha nut fits a wide range of Yamaha outboards. Aftermarket listings show it fits engines from approximately 9.9 HP up to 250 HP on 2-stroke and 4-stroke models, where self-locking hardware is needed.([turn0search0][turn0search1][turn0search13]) It also appears on diagrams for mounting brackets and control components in older Yamaha parts diagrams. Because this nut locks itself as torque is applied, it resists backing off under vibration and load. Ordinary nuts may loosen over time, but this design helps keep your assembly secure.

When a self-locking nut wears or its locking element fatigues, components can loosen. You might hear rattles, feel sloppy mounts, or notice fasteners backing out. Replacing old nuts with a correct-spec unit like the 90185-22043-00 Yamaha nut restores proper clamp force and helps prevent fastener failure. Tight, secure hardware also lowers the risk of parts shifting under load or vibration while underway.

Shop at Arizona Outboard Dismantlers to keep your outboard running strong and ready for the water.