A milling tool body for a milling tool, the milling tool body comprising:
- an axial front end surface;
- an axial rear end surface opposite to the axial front end surface;
- a peripheral mantle surface extending between the axial front end surface and the axial rear end surface;
- a front end extending from the axial front end surface toward the axial rear end surface;
- a rear end extending from the axial rear end surface toward the front end, the rear end being configured for attachment of the milling tool to a machine;
- a first longitudinal centre axis extending between the axial front end surface and the axial rear end surface, the tool body being rotatable around the first longitudinal centre axis in a direction of rotation;
- at least two insert seats being entirely provided in the front end and distributed in a circumferential direction of the milling tool body, each of the at least two insert seats being configured to accommodate a cutting insert;
- a chip pocket provided in front of each of the at least two insert seats in the direction of rotation and delimited by a chip pocket wall entirely provided in the front end;
- at least one coolant inlet and at least one coolant outlet;
- and
- a cooling duct system extending from the at least one coolant inlet to the at least one coolant outlet, wherein the cooling duct system is arranged such that coolant supplied via the at least one coolant inlet flows through the cooling duct system to the at least one coolant outlet without leaving the milling tool body along its way between the at least one coolant inlet and the at least one coolant outlet, wherein the at least one coolant inlet is arranged in a first ring-shaped section of the peripheral mantle surface, and the at least one coolant outlet is arranged in a second ring-shaped section of the peripheral mantle surface, wherein the first and the second ring-shaped sections are separated from each other by an intermediate ring-shaped section of the peripheral mantle surface, wherein the first ring-shaped section is flanked by a third ring-shaped section of the peripheral mantle surface such that the first ring-shaped section is axially located between the intermediate ring-shaped section and the third ring-shaped section when seen in a direction of the first longitudinal centre axis, wherein the second ring-shaped section is flanked by a fourth ring-shaped section of the peripheral mantle surface such that the second ring-shaped section is axially located between the intermediate ring-shaped section and the fourth ring-shaped section when seen in the direction of the first longitudinal centre axis, and wherein the first, the second, the third, the fourth ring-shaped section and the intermediate ring-shaped section extend between the front end and the axial rear end surface, wherein each of the third, the fourth and the intermediate ring-shaped section is a surface of revolution created by a 360° rotation of a curve or a line around the first longitudinal centre axis of the milling tool body, and is arranged to be a sealing surface and co-operate with a sealing ring arrangement.