heavy profile flex top locknuts for heavy vibration

These are taller and about 10% broader than regular flex-top nuts, which allows them to distribute bigger loads over a greater surface area. Unlike both distorted-thread and nylon-insert locknuts, the top part stretches to grasp the screw on all sides for a firmer hold. They are therefore appropriate for use in machinery that vibrates vigorously and continuously, such engines. Although these locknuts can be reused a few times, their holding capacity diminishes with each usage.