Hollow shank taper

Taper sizes HSK32 to HSK160, form A/B/C/E/F/T The hollow shank taper has been established as the modern interface between machine and tool, and is characterized by the following advantages:



  • Smaller (approx. 30 %) and lighter (approx. 50 %) than the steep taper
  • Easier and faster tool change as a result
  • High stiffness due to support on the tool holder via the collar
  • Transfer of torque
  • Frictionally via the taper and contact surface
  • Positive-locking via the driver grooves
  • Jerking loads and large torque can be transferred via positive lock by drivers.
  • Exceptional changeover precision (3 μm), since
  • Axial positioning precision is given by the planar contact on the collar 
  • Concentricity deviations are minimized by the tight taper tolerance
  • Suitable for high speeds, since problems resulting from expansion of the spindle, as are present with the steep taper, do not occur; 2 reasons:
  • The hollow shank taper expands at the same or greater dimension as the spindle due to centrifugal force (produces a clamping force increase) 
  • The planar contact prevents slipping in the axial direction.


We would be happy to provide you with more information about our wide range of standard and custom HSK tool holder products. (Standard tool holders with link to our e-shop)