Metric Din 6926 Hex Nylon Insert Flange Locknut Serrated A2 Stainless Steel

Hex nut with a nylon-filled collar at its back end and an enlarged circular base flaring out from the front end of the nut. When an externally threaded fastener reached the collar, the threads and nylon form a tight, frictional fit as the nylon applies download pressure that forces contact between the internal and external threads