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Product data

Dimension standardsMetric thread: ISO 2982-2, except for the width of KMK lock nuts

Grub screws:

  • KMK → ISO 4026, material class 45H
  • KMFE → ISO 4028, material class 45H
Lock nut outer diameter and slots for mounting according to DIN 981
TolerancesMetric thread, 5H: ISO 965-3
Mating shaft threads
(recommendation)
Metric thread, 6g: ISO 965-3
Loosening torque
KMK and KMFE lock nuts are locked on the shaft (sleeve) by friction. The friction, and therefore the loosening torque, varies as a result of the accuracy of the tightening torque of the grub (set) screw, the surface finish of the shaft (sleeve) thread, the amount of lubricant on the thread, etc. The lock nuts should be properly mounted to threads that are dry or only have a minimum amount of lubricant on them.

KMK and KMFE lock nuts provide sufficient locking for intended bearing applications.
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