The DUBO toothed collar ring is an unique addition to the DUBO retaining ring, and is 

　　intended for use in combination with high quality steel nuts (8.8). It will now be possible to 

　　admit any desired bolt tension without damaging the DUBO retaining ring on account of 

　　high bolt and nut loads, whereas this invention also permits to use whatever nut as a locking nut, which can be re-used. By putting the DUBO retaining ring into this toothed collar 

　　ring, optimum deformation of the DUBO ring is obtained after tightening the nut. The 

　　deformation of the DUBO ring causes the locking and tightening effect according to the 

　　DUBO principle.