HSK (hollow taper shanks) DIN 69063-1 (ISO 12164-1) Form A Standard type for machining centres and mil- ling machines. HSK for automatic tool change with DIN 69871 gripper groove and index notch. Manual operation is via access hole in taper. ISO 60 ❷ ❶ ❷ ❼ ❻ MA S 403 BT DIN 2080 ❸ ❸ HSK-A ❾ VDI ❺ ❹ ❽ Term definitions of HSK-A interface for automatic tooling systems ❶ Gripper groove: circular groove MORSE ❷ Index notch: sickle-shaped notch across gripper groove ❸ Keyway on collar: index notch or for attachment in tool magazine or grippers. ❹ Coding/identification: bore in collar for attachment of identification system (coding chip) ❺ Thread for coolant: for attachment of coolant supply set ❻ Keyway on taper shank: form closed torque transmission to spindle ❼ Radial bore in taper shank: necessary for manual clamping systems ❽ Clamping shoulder: circular chamfer for drawing in the tool ❾ Position of the tool edge of single-edged tools 258