Side cooling for milling tools

The invention relates to a tool body (1) for a milling tool. The tool body comprises: a front end (5); a rear end (6); an envelope surface (7) extending between the front end (5) and the rear end (6); a central recess (8) extending from the rear end (6) and configured to receive coolant from a main shaft of the machine; at least one insert seat (3) in which the cutting insert (2) can be firmly mounted, the at least one insert seat (3) being formed in a transition between the front end (5) and the envelope surface (7); and at least one coolant passage for passing coolant from the central recess (8) to the outside of the tool body (1). The coolant passage comprises a first portion (9) extending from the central recess (8) in an outward direction towards the envelope surface (7), and a second portion extending from the first portion (9) to an outlet (11) in the exterior of the tool body (1), wherein the outlet opening (11) is positioned in the insert holder (3) and/or in the envelope surface (7) downstream of th