Metric Din 986 Hex Nylon Insert Domed Cap Nut A2 Stainless Steel

A hex nut with a dome-shaped top (similar to an acorn) and a round collar where the hexagonal section and dome meet. Within this collar is a nylon insert. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when it is subjected to vibration. The nylon comes in various colors