MS21044C04 | صواميل ذاتية القفل وفقًا للمواصفات العسكرية (250/عبوة)

Used these on a few engine mounts and they held tight even after hours of vibration. The nylon insert really does its job locking the threads.

Installed a dozen of these on the tractor deck and they held tight through a full afternoon of rough mowing. The nylon insert really locks the nut in place without galling the threads. Good deal for the quantity.

Picked up a pack for securing some brackets on my off-road rig, and the self-locking mechanism is a lifesaver—no more worrying about nuts backing off mid-drive. The mil-spec feel gives me confidence they’ll hold under constant vibration.