Axially adjustable tool holder

Axially adjustable tool holder, essentially constituted by a principal body (1) with attachment, in a recess (2) of which is slidably mounted a mobile part (3) for mounting a tool (4), characterized in that the mobile part (3) for mounting a tool (4) cooperates with a ring for transverse adjustment (5), freely mounted in rotation on an extremity of the principal body (1) including the recess (2) for mounting said mobile part (3) for mounting a tool (4), and secured transversely to said extremity, by means of a ball bearing device (8), and presented in the form of a sleeve provided with an interior thread (5′), said ball bearing device (8) allowing axial play of said ring for transverse adjustment (5), when the mobile part (3) is tightened, which guarantees application of a proximal face (51) of the adjustment ring (5) against a corresponding distal external supporting flange (1′) of the principal body (1), the mobile part (3) being locked in working position, after adjustment, by means of at least one device for tightening (6) by traction cooperating with a corresponding part (7) of the mobile part (3).