HSK (hollow taper shanks)
HSK-toolholders DIN 69893
The hollow taper shank (HSK) has prevailed since its standardization as an
interface between machine and tool.
HSK benefi ts to the user include:
• High static and dynamic rigidity
• High precision axial and radial reproducibility
• High tool change accuracy and repeatability
• High speed machining performance
• Short tool changing times
• Coding and identifi cation
• Coolant feed
Balancing recommendations and r.p.m. limits
Kemmler HSK-toolholders are generally pre-balanced to G 6.3/15,000 rev./min.
Fine balancing on request is possible.
Because the rotational speed is the largest infl uencing factor together with the
limits regarding the spindle or spindle bearing interface, the following r.p.m.
limits for HSK interfaces have been recommended as guidelines within the HSK
standards:
HSK-A/C 32 to 30,000 rev./min
HSK-A/C 40 to 30,000 rev./min
HSK-A/C 50 to 30,000 rev./min
HSK-A/C 63 to 25,000 rev./min
HSK-A/C 100 to 16,000 rev./min
Depending on the tool, it may be necessary to balance both the tool holder and tool
when applying the maximum r.p.m. Exact limits can only be deter mined if machine
and spindle manufacturers are taken into consideration and it is possible to defi ne
tools and projecting lengths.
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KEMMLER
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HSK-A/C 80 to 20,000 rev./min