MS21042-02 | صواميل ذاتية القفل حسب المواصفات العسكرية | فولاذ (100 / عبوة)

The lock washer design on these nuts did exactly what I needed—they held tight on a trailer hitch bolt where standard nuts kept backing off. No more rattling loose after a few miles of rough road.

Used these on a bracket that kept shaking loose every few weeks, and they've held rock solid through a month of daily vibration. The nylon insert grabs tight but still lets me back them out with a wrench when I need to.

The steel feels really solid, and these nuts held tight on my ATV's suspension bolts through a weekend of rough trails. I appreciate how the nylon insert locks them in place without needing threadlocker.