Ultra-Precision Tool Holders with HSK-E25 Spindle Interface (DIN69893)

To use the potenatial of an Ultra-Precision tool spindle an ultra-precise and dynamically neutral tool holding is required. Hence DIN 69893 compliant and commercially available HSK tool holders are suitable to only a limited extend with our tool spindle models ASD-H25, ASD-H25A and UASD-H40.

By making use of our highly specialized manufacturing – what of course includes our spindle solutions – and innovative balancing methods we were able to develop and manufacture our HSK tool holding solution UTS-x. In compliance with DIN 60893 and for the first time ever Ultra-Precision HSK tool holding with the following properties can be offered to our customers: *):

  • Static Tool Run-Out:  < 0.8 micron
  • Balancing Quality:  G0,3 mm/s at 60.000 rpm
  • Repeatability, axial/radial:  < 0,2 µm

While tool run-out is reduced by 70% balancing quality is even more than 25 times better than the industry standard.

Hence our slogan: “Ultra-Precision meets Industrial Grade

*) if used with Levicron UASD-H40 tool spindle


Schnittstelle / DIN:


Verfügbare Spanndurchmesser, metrisch:

Verfügbare Spanndurchmesser, Zoll:

Garantierter Rundlauf am Werkzeug *):

Garantierte Auswuchtgüte *):

Wiederholaufspanngenauigkeit *):

*) Bei Verwendung mit Werkzeugspindel Levicron UASD-H40

HSK-E40, DIN69893-E

Thermisch Schrumpfen

6 mm, 4 mm, 3 mm

1/4″, 1/8″

< 0,8 µm

< G0,3 mm/s bei 60.000 Upm

< 0,2 µm


Bestellnr. / order no. Kegel / taper d1 (für h5) d2, mm d3, mm L, mm l, mm
023.332 HSK-E40, DIN 69893 6 12,5 18,6 55 34,5
023.221 HSK-E40, DIN 69893 4 10 15,2 50 30
023.111 HSK-E40, DIN 69893 3 9 13,5 45 26
023.432 HSK-E40, DIN 69893 1/4" 12,5 18,6 55 34,5
023.511 HSK-E40, DIN 69893 1/8" 9 13,5 45 26

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  • Tool Clamp Accuracy and Repeatability

Our highly specialized manufacturing allows us to guarantee a spindle taper run-out of under 50 nm. The same manufacturing technology is used to machine our Ultra-Precision HSK tool holders UTS-x for which we guarantee a tool run-out of under 0.8 micron and a balancing quality of better G0.3 mm/s at 60.000 rpm.

The picture on the right shows a tool run-out measurement of our ASD-H25 at a customer site and at 185 mm in front of the spindle nose. A measured value of below 0.5 micron confirms the quality and combination of our HSK tool interface and spindle taper.

As a standard test the tool change repeatability of every spindle is tested by our 4 x 90° reversal balancing test at top speed (lower picture). For this the residual imbalance of one of our UTS-x HSK tool holders is measured at 0°. Then the resdidual imbalance is measured after the holder was rotated by 90° against the shaft. This done three times. The distance from the midpoint of the resulting square to one of its corner represents the tool clamp repeatabilty where the imbalance is defined as an eccentricity of the tool holder mass. With this method we can guarantee a tool clamp repeatability of less than 0.2 micron.