The invention relates to a tool body (1) for a milling tool. The tool body includes 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 spindle of a machine, at least one insert seat (3) in which a cutting insert (2) can be securely mounted formed in a transition between the front end (5) and the envelope surface (7), and at least one coolant passageway for passage of coolant from the central recess (8) to the exterior of the tool body (1). The coolant passageway 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 (11) is located in the insert seat (3) and/or in the envelope surface (7) behind the insert seat with respect to a rotation direction of the tool body (1). The second portion of the coolant passageway is directed towards the insert seat (3) such that, when a cutting insert (2) comprising a cutting edge (24) and a flank face is mounted in the insert seat (3) such that the flank face faces outward with respect to the tool body, coolant emerging from the outlet (11) will pass along the flank face towards the cutting edge (24). The second portion of the coolant passageway is a channel (10) having a length that is greater than a width thereof.