Locknut
The locknut is a machine element for axially securing shaft-hub connections , e.g. B. a gear on a shaft . The nut nuts have a relatively large inner diameter and are screwed onto shafts to exert axial pressure on hubs . The purpose of this pressure, however, is usually only to fix the hub, not to directly create a non-positive connection. The exception here is the preload of shafts supported by roller bearings.
Usually the locknut is used in combination with a locking plate according to DIN 5406, which prevents the locknut from loosening by itself. Locknuts are usually made with a fine thread . A suitable hook wrench or locknut wrench is required for clamping and releasing .
DIN 981 differentiates between different types of locknuts. The standard version with a metric ISO thread is called KM , a variant with a thinner edge is called KML . Locknuts with trapezoidal thread are given the designation HM ; in the case of reinforced versions, a T is appended to the abbreviation.
Norms
- DIN 981
- DIN 1804
- DIN 70852
- DIN 11851 locknut (food industry) (DN 10 - DN 150)