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Special
interfaces
30
SK Characteristics:
HSK / HSK-C Characteristics:
• Standardised to DIN 69871 with retention knob
• Torque transmission by means of the friction contact of the taper
with low strain
• For larger torques and sudden loads, driving keys are primarily
responsible for the transmission
• The driving keys are arranged asymmetrically on the spindle face
for clear orientation for the tool
• Easy production
• Self-centring due to steep taper
• High speeds can expand the spindle cone and the resulting
centrifugal force can cause axial distortion of the tool
• The centrifugal force distortion reduces the contact surfaces and
therefore the frictional transmission of torques
• Standardised to DIN 69893
• No retention nob
• Smaller (ca. 30 %) and lighter (ca. 50 %) than the steep taper (SK)
• Faster and easier tool change
• Rigidity 5 to 7 times higher than with steep taper holders due to
support on the tool holder over the collar
• Force-closing due to the taper and contact surface
• Form-closing by means of drive slots
• Excellent change accuracy (3 μm)
• Face contact on collar ensures axial wobble accuracy
• Close taper tolerance minimises radial run-out
• HSK-C has a shorter shank with a flatter taper angle