KEPS NUTS, OR K LOCK NUTS, ARE HEX NUTS PRE-ASSEMBLED WITH A FREE SPINNING EXTERNAL TOOTH LOCK WASHER. THE LOCKING ACTION IS ACHIEVED WHEN THE NUT IS TIGHTENED AGAINST A BEARING SURFACE AS THE TEETH OF THE WASHER DIG INTO IT. THE K-LOCK NUT IS THE MOST POPULAR TYPE OF LOCKNUT BECAUSE OF ITS VERSATILITY, COST, AND EASE OF INSTALLATION