Clamping chuck, notably expansion chuck

A clamping chuck, in particular an expansion chuck, having a dimensionally stable chuck body (1) in which is embodied a central receptacle (4) for the shank of a workpiece or tool to be clamped, and having a clamping mechanism (6) for securing in the receptacle (4) a shank inserted into the receptacle (4), a stop element (9) that can be axially adjusted by means of an adjusting device (12) being provided for axial positioning of the shank in the receptacle (4), characterized in that the adjusting device (12) is configured as a worm gear drive having a worm (13) rotatably mounted transversely to the receptacle (4) in the chuck body (1) and a worm gear (14) arranged coaxially with the receptacle (4), the stop element (9) being coupled to the worm gear (14) and retained in the chuck body (1) in such a way that a rotary motion of the worm gear (14) is converted into an axial motion of the stop element (9).