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This document specifies the dimensions for hollow taper shanks with flange contact surface (HSK). These shanks are the male part of the interface to the machine tools (e.g. milling/drilling, turning and grinding machines). This document specifies three types of shanks: —     type T has a peripherally grooved flange for automatic tool change in turning machines with a gripper for HSK type T; —     type TA has a peripherally grooved flange for automatic tool change in milling machines, enabled (designed) for turning, with a gripper for HSK type A or AB; —     type U has no peripheral groove flange and is designed for manual tool change in turning machines. HSK types T and TA can also be changed manually via radial access bore holes in the hollow shank taper.