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.