Abstract: A rotary cutting tool rotatable about a tool axis in a direction of rotation having a front cutting portion and a rear coupling portion. The front cutting portion has a front outer peripheral surface with a plurality of N circumferentially spaced apart cut-outs, each cut-out having an operative cutting edge associated therewith. A central coolant passage extends along the tool axis from a rear end of the rear coupling portion to the front cutting portion. A first plane perpendicular to the tool axis intersects the central coolant passage and the N operative cutting edges. In a cross-section taken in the first plane, the central coolant passage has a non-circular shape with N radially outer coolant regions. At least one coolant duct extends transversely from each radially outer coolant region to intersect with and open out at a corresponding one of the N cut-outs at a coolant exit port.