The invention is based on a hand power tool having a tool mount capable of being driving in an at least rotating fashion via a drive motor and a drilling spindle (13), which said tool mount comprises a clamping device for securing tools that is capable of being operated in the direction of rotation of the drilling spindle (13), and having an arresting mechanism (38), via which the drilling spindle (13) can be coupled in torsion-resistant fashion relative to a part (27) of the machine housing (26) to tighten and loosen the clamping device of the tool mount (12), and which opens automatically when torque is transferred from the drive motor to the tool mount (12) and locks automatically when torque is transferred from the tool mount (12) to the drive motor. The arresting mechanism (38) is located on an intermediate shaft (17) and combined with a safety clutch (58) that is also located on the intermediate shaft (17) (FIG. 2).