KMT/KMTA shaft lock nuts


The KMT/KMTA nuts are locked in place with three brass securing-pins that are uniformly distributed around the circumference, which in turn are attached at an angle to the nut. The angle at which the pins are worked into the nuts matches the internal thread's profile angle. While manufacturing the nut's internal thread, the end face of the securing pin is likewise provided with the thread profile.

The nuts are locked by pressing the securing pins against the shaft thread using setscrews. Subsequently the axial forces are absorbed by the thread flanks and not by the securing pins. The thread flanks are not relieved and the nuts do not deform. Securing the nuts against shifting is only effected through the friction between the securing pins and the shaft threads.

The nuts can be used as often as desired and retain their precision because the securing pins are not deformed by the cut-thread profile, meaning the shaft threads are also not damaged. As a shaft groove is superfluous, the shaft diameter can be made smaller and the costs for the groove are omitted.

Compensation for inaccuracies
The three securing pins, uniformly distributed around the circumference, facilitate setting an exact right-hand angle while securing, provided the play between the nuts and the shaft thread allows this. Inaccuracies from components attached to the shaft can be compensated with the nuts.

The KMT nuts have grooves distributed around the circumference and are provided with key surfaces up to size 15 on top of that. For mounting, you can use open-end wrenches, hook spanners and striking-face wrenches. The KMTA nuts have bore holes both on the circumference and on the face. You can mount them on the circumference using C-spanners with studs or on the face, for example with adjustable face-pin spanner wrenches.

The difference between KMT - KMTA
The KMTA shaft nuts differ from the KMT shaft nuts in their outer form and partially also in their thread leads. They have smaller overall diameters and smooth, cylindrical jacket shells. They are especially intended for applications involving limited installation room.

Material properties

  • Material: High strength steel
  • Surface treatment: black-finished
  • Securing pin: hard-drawn brass
  • Adjusting screws: in accordance with DIN 913/ISO 2343, property class
  • Nut thread tolerance: 5 H
  • Recommended shaft thread tolerance: 6g

The right to technical changes is reserved.

Update: 20.02.2009    |    Imprint   |    Overview   |    Webmaster
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