Serrated Flange Nuts

Serrated flange nuts are hex nuts with built-in non-spinning washers with serrations on the bottom. This kind of flange nut is used to help prevent loosening when vibrations are present. Like any other hex nut, you can tighten a locking flange nut with a wrench or ratchet of the appropriate size after threading it onto the end of the bolt you’re installing, flange acts as a washer, which allows the nut to fasten evenly to the installation material’s surface.