Screw-in tool and tool holder for such a screw-in tool

[0028]FIGS. 1 and 2 show a tool arrangement with a screw-in tool 1 and a corresponding tool holder 2 in a longitudinal section and a perspective view. The screw-in tool 1 has a tool head 3, which is designed here as a spherical-head cutter, and a tool shank 4, which tapers conically toward the rear, with an outer winding 5. A first supporting region with a first conical bearing face 6 is provided between the tool head 3 and the outer winding 5 for the placement on a counter-conical contact surface 7 on a front side of the tool holder 2, and a second conical bearing face 8 for the placement on a second conical contact surface 9 in the interior of the tool holder. In this way, a double cone, which ensures an improved centering and an increased supporting effect, is produced on the transition between the tool head 3 and the outer winding 5. A second supporting region 11 is found on a free rear end 10 of the tool shank 4.

[0029]As can be seen particularly from FIG. 2, the tool head 3 has, o