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Product Description Stover lock nuts are one piece, all-metal 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 be capable of withstanding severe vibration and shock loads Since they are top locking and only the bottom surface is flat, these nuts are considered one way lock nuts because they are installed one way. From the Manufacturer Stover lock nuts are one piece, all-metal 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 be capable of withstanding severe vibration and shock loads. Since they are top locking and only the bottom surface is flat, these nuts are considered one way lock nuts because they are installed one way.