Patent ID: 8764354

Claim:
A cutting tool for a machine tool, comprising: a cutting head having a number of blades, a cutting-head rear wall and a flat collar on the cutting-head rear wall; a shank; a coupling which detachably fixes the cutting head to the shank, said coupling consisting of a coupling pin on the cutting-head rear wall and a receptacle in the shank, said receptacle being complementary to the coupling pin and accommodating the coupling pin when the coupling is closed; and a central coolant passage in the shank, said coolant passage branching into two sub-passages in the region of the receptacle, wherein the two sub-passages flank the receptacle in a wall thereof, wherein: the two sub-passages open into a flat contact surface surrounding an opening edge of the receptacle in a ring-like manner and each sub passage opens into the flat contact surface via an orifice, the flat collar having an annular distribution groove formed on the cutting-head rear wall, wherein the flat collar defines a cut-out portion in communication with the distribution groove such that the cut-out portion is configured to widen a region of the distribution groove, the cut-out portion being located opposite one of the orifices when the coupling is closed, and at least one coolant bore connects the distribution groove to the number of blades on the cutting head.