Tool head for a rotating tool

A tool head for a rotating tool, comprising:

• a basic body with a mid-axis and with an end face;
• an annular portion arranged on the end face on the basic body and surrounds a cavity having a cylindrical configuration;
• and
• an adjusting device which acts from inside on the annular portion and comprises an adjusting screw with a shank and an adjusting sleeve, the shank of the adjusting screw having a first shank portion engaging into an assigned threaded bore in the basic body and having a first external thread, the adjusting sleeve surrounding the shank of the adjusting screw and being arranged at least partially in the cavity, the adjusting sleeve being displaceable in the direction of the mid-axis by means of the adjusting screw, the adjusting sleeve having a conical outer face that interacts with an inner face of the annular portion in such a way that, when the adjusting screw is being screwed into the threaded bore, the annular portion is spread open by the adjusting sleeve,
• wherein the adjusting sleeve is provided with an internal thread, and
• wherein the adjusting screw has a second shank portion with a second external thread which is in engagement with the internal thread of the adjusting sleeve, and
• wherein the two external threads possess the same flight direction and the first external thread has a greater lead than the second external thread (h>g), or the two external threads possess different flight directions,
• wherein the adjusting screw and the adjusting sleeve are completely countersunk in the cavity.