DIN 69893-1:2011-04

This standard specifies the dimensions for hollow taper shanks with flange contact surface (HSK) to be applied on machine tools (e. g. turning machines, drilling machines, milling machines and grinding machines). A range of shank sizes has been specified and two shank types were included. Type A incorporated a grooved flange to enable automatic tool exchange. The tools are also manually exchangeable. Type C has no groove in its flange and can only be manually exchanged. For both types, a bore in the taper shank has been provided for manual clamping. The torque is transmitted by the drive key notch at the tail end of the shank as well as by friction lock.