high profile nylon insert locknuts

Because of their greater gripping surface and little height increase over standard-profile locknuts, your wrench or socket won't fall off when you tighten them. They are frequently seen in machinery and cars with hard-to-reach fasteners. Without causing thread damage, the nylon insert holds the screw in place and keeps it from loosening under mild vibration. However, exposure to high temperatures may cause the insert to become brittle. Although these locknuts can be reused a few times, their holding capacity diminishes with each usage.