Abstract: A grinding tool, in particular a concrete grinding tool, comprising a drive spindle (1) driven by a motor in the working rotational direction (A) having a tool receptacle (7) at its free end. The tool receptacle (7) is provided with a flange (2) non-rotationally disposed on the drive spindle (1) and a nut (3) that can be threaded onto the free end (6) for clamping the tool (5) against the flange (2). The tool receptacle (7) further comprises an anti-rotation device (4) that prevents a rotation of the tool (5) relative to the drive spindle (1) in the working direction of rotation (A) of the drive spindle (1).