Tab washers and retaining brackets are suitable for securing locknuts.
Tab washers are used for smaller locknuts (series KM and KML). They have an inner tab and several outer tabs evenly spaced around the circumference. The inner tab grips in the slot on the adapter sleeve or shaft, one of the outer tabs is bent into a slot in the nut for location.
Retaining brackets are used for larger locknuts (series HM30 and HM31). They are fixed to the locknut using a hexagonal screw. They engage in a slot in the nut and in the adapter sleeve or shaft.