8-32 Black-Oxide C.R.18-8 Stainless Steel Thin-Profile Nylon-Insert Locknuts
X1Tools Black-Oxide Corrosion-Resistant 18-8 Stainless Steel Thin-Profile / Low Profile Nylon-Insert Locknuts / Stop-Nuts are made to resists loosening due to use or vibration without damaging threads thus prevent a fastener from backing off.