Abstract: A method and tool for cold forging or cold hammering of internally profiled tubes, whereby a forging blank (2) is while rotated, forged by the action of a number of forging hammers (4), whereby the workpiece (2) as a result of material displacement is formed around a profiling mandrel (3). Before cold forging, the mandrel (3) is adjusted with its axial center (c--c) to a position axially to the side of the forging blank's (2) axial center (c'--c') at a distance equal to half the rolled billets extension during cold forging, and in the direction away from the forging hammers' start position. The apparatus comprises an end socket (5) and a driver (10) between which both the workpiece (2) and mandrel (3) are arranged to be clamped.