Locknuts are used to position bearings on a shaft. The KM and KML nuts have metric threads and four equally spaced slots around their circumference for key placement. They should be secured with a lock washer to prevent accidental loosening. KM and KML locknuts can be reused as long as they are not damaged. The KMFE locknuts with an integrated locking screw are designed for axial positioning of CARB toroidal roller bearings, sealed spherical roller bearings, and sealed angular contact ball bearings on the shaft. They reduce shaft costs as no keyway is required. HM locknuts have metric trapezoidal threads and eight equally spaced slots around their circumference for impact wrench key placement.