A holding device for a flanging tool includes two clamping parts movable towards one another to respective clamping positions. A stop is configured to abut, in an abutment position, an end of a pipe to be flanged. An actuating mechanism is configured to move the clamping parts into the respective clamping positions so as to clamp the pipe to be flanged. The actuating mechanism is coupled to the stop such that actuation of the actuating mechanism moves the stop out of the abutment position.