Portable Power Tool

A portable power tool has an exciter piston guided along a movement axis in a guide tube and a striker coupled to the exciter piston. A connecting rod is fastened to a piston pin in the exciter piston and to an electric motor. A bearing for supporting the piston pin is formed by a piston head of the exciter piston and a closure plate inserted into the exciter piston. A rotary closure is formed by a groove, extending in a direction of rotation about the movement axis, in the piston wall and by a radially protruding fin on the closure plate. A detent for locking the fin counter to the direction of rotation is pivotable in the radial direction between a locking position and a releasing position. The detent is deflected beyond the external dimensions of the piston wall in the radial direction in the releasing position.