Abstract: A tool for metal-cutting comprises a holder (3) on which is mounted in its front part (3a) a cutting plate (6) and which is formed together with a base body (2) as an integral unit by being connected rigidly to the base body (2) in the region of its rear end (3b), a perforation (9) in the holder forming a parallel-type spring arrangement so that the holder is resiliently deflectable relative to a support (11) formed by the base body (2), and an adjustment device for deflecting the holder in use as desired.

Abstract: A tool holder (1) which can be inserted into the main spindle of a machine-tool is provided on the front region of its shank portion (2) with a cylindrical guide portion (11) for a tapered ring (12) which can be braced elastically and on the rear region of the shank portion (2) there is provided a second cylindrical guide portion (12) for a second tapered ring (14) which can also be braced elastically. At least one of the tapered rings (13, 14) is advantageously provided with a longitudinal slot or partial slots. A flange portion (3) is provided on the front portion which is applied against the front end face (27) of the main spindle (5) .

Abstract: To achieve reliable fastening of a toothed cutter carrier on the toothed bearing surface of a tool body, and to achieve favorable force ratios, in a rotary cutting tool, in particular a drilling head, the tooth formation of the bearing surface is constructed in a sawtooth shape with steep tooth flanks and inclined tooth flanks, the steep tooth flanks being disposed substantially on that side of the teeth which is orientated towards the cutting element of the cutter carrier. The tooth formation on the cutter carrier is constructed so that it is substantially similar to the tooth formation of the bearing surface for interengagement therewith.