Prevailing Torque Nut, Zinc or Yellow Zinc, Grade C (GR.C)

Prevailing torque lock nuts are one piece, prevailing torque hex nuts with a conical top and a flat bottom bearing surface with chamfered corners. The locking action, created by distortion of their top threads, is said to resist loosening caused by shock, vibration and other dynamic forces. Since they are top locking and only the bottom surface is flat, prevailing torque lock nuts are considered one way lock nuts because they are installed one way—conical top up. Being all-metal, they are not subject to the temperature and chemical limitations of non-metallic (such as nylon) insert type lock nuts. Used in agricultural equipment and the automotive and metalworking industries, prevailing torque lock nuts are also known as: all metal lock nuts, all steel lock nuts, automation style lock nuts, top lock nuts. Lock washers are not used with prevailing torque lock nuts. Yellow Zinc offers a modest amount of corrosion resistance, slightly higher than that of clear zinc.