Lock nuts requiring a keyway

-KM, KML, HM .. T metric lock nuts retained with a lock washer
-HM(E) metric lock nuts retained with a locking clip
-N and AN inch design lock nuts retained with lock washers
-N inch lock nuts retained with a locking plate

HM 3060 Lock nut with metric trapezoidal thread, for locking by clip

KM 30 Lock nut with metric thread, for locking by lock washer