90205-PP9-020 Self-Lock (6mm) Nut - Overview. The 90205-PP9-020 Self-Lock (6mm) Nut is a critical component designed for Honda marine engine systems, providing secure fastening to prevent loosening caused by vibration. Integral to rigging and accessory assemblies, this self-lock nut ensures reliable mechanical integrity and maintains the tightness of connections within component assemblies, contributing to the overall durability and performance of your equipment. Built to match Honda factory spe