Tool holder

1. A tool holder having a main body and a holding pin onto which a rotary tool with a holding bore is positionable, wherein at least one channel opens at the outer circumference of the holding pin and is arranged for transporting coolant and/or lubricant in the tool holder, wherein at least one longitudinal groove for conducting the coolant and/or lubricant in the longitudinal direction of the holding pin is arranged on the outer circumference of the holding pin and wherein the at least one channel opens at the transition of the holding pin to the main body and opens into the at least one longitudinal groove.

2. The tool holder of claim 1 , wherein the at least one longitudinal groove comprises a plurality of longitudinal grooves connected by an annular groove running in the circumferential direction of the holding pin.

3. The tool holder of claim 1 , wherein the at least one channel opens into an annular groove.

4. A tool arrangement having the tool holder of claim 1 , wherein the holding bore of the rotary tool, on the inner circumference thereof, has at least one tool-side longitudinal groove for conducting coolant and/or lubricant in the longitudinal direction of the rotary tool.

5. The tool arrangement of claim 4 , wherein the at least one channel of the tool holder opens into the at least one tool-side groove of the rotary tool.

6. The tool arrangement of claim 4 , wherein the at least one tool-side groove of the rotary tool overlaps the at least one longitudinal groove of the tool holder at least in part.

7. The tool holder of claim 1 , wherein the rotary tool is a milling tool.

8. A tool holder having a main body, a holding pin onto which a rotary tool with a holding bore is positionable, and a clamping bolt securing the rotary tool to the tool holder, wherein at least one channel arranged for transporting coolant and/or lubricant in the tool holder opens at an outlet at the outer circumference of the holding pin offset from the transition of the holding pin into the main body, the at least one channel in fluid communication with at least one longitudinal groove arranged on the outer circumference of the holding pin for conducting the coolant and/or lubricant in the longitudinal direction of the holding pin, and wherein the holding pin has a circumferential centering ridge on the outer circumference, with the centering ridge located between the outlet of the at least one channel and the transition of the holding pin into the main body.

9. The tool holder of claim 8 , wherein the at least one longitudinal groove comprises a plurality of longitudinal grooves connected by an annular groove and wherein the plurality of longitudinal grooves and the annular groove are arranged between the front end face of the holding pin and the centering ridge.

10. The tool holder of claim 8 , wherein the rotary tool is a milling tool.

11. A tool holder comprising:

a main body;

a holding pin onto which a rotary tool with a holding bore is positionable;

at least one channel opening at the outer circumference of the holding pin and arranged for transporting coolant and/or lubricant in the tool holder;

a plurality of longitudinal grooves in fluid communication with the at least one channel arranged on the outer circumference of the holding pin for conducting the coolant and/or lubricant in the longitudinal direction of the holding pin;

an annular groove on the outer circumference of the holding pin,

wherein an annular thin-walled intermediate sleeve, which covers the plurality of longitudinal grooves and the annular groove at least in part, is arranged on the holding pin.

12. The tool holder of claim 11 , wherein the intermediate sleeve is sealingly connected in a force-fitting manner to the holding pin.

13. The tool holder of claim 11 , wherein the intermediate sleeve, on the outer circumference thereof, has a centering bead for centering the rotary tool.