HSK (hollow taper shanks) Ë Ê Ë Ð Ï Ì Ì Ò Î Í Ñ Term defi nitions of HSK-A interface for automatic tooling systems Ê Gripper groove: circular groove Ë Index notch: sickle-shaped notch across gripper groove Ì Keyway on collar: index notch or for attachment in tool magazine or grippers. With HSK-B/D also provides form closed torque transmission to spindle. Í Coding/identification: bore in collar for attachment of identifi cation system (coding chip) Î Thread for coolant: for attachment of coolant supply set Ï Keyway on taper shank: form closed torque transmission to spindle Ð Radial bore in taper shank: necessary for manual clamping systems Ñ Clamping shoulder: circular chamfer for drawing in the tool Ò Position of the tool edge of single-edged tools 13 KEMMLER 13.32