Cutting head having torque transmission surfaces on a mounting protuberance and rotary cutting tool having such cutting head

Abstract

A cutting head rotatable about a head axis, has a cap portion and a mounting protuberance joined thereto and extending axially rearwardly therefrom. The mounting protuberance has a plurality of circumferentially spaced apart torque portions axially offset from a plurality of circumferentially spaced apart clamping portions. The clamping portions have clamping surfaces circumscribed by an imaginary clamping circle with a clamping diameter. The torque portions have torque protrusions and torque cut-outs, each torque protrusion having a torque transmission surface at least partially located outside an imaginary clamping cylinder defined by the imaginary clamping circle, and each torque cut-out having a recessed surface located inside the imaginary clamping cylinder. The cutting head is releasably secured to a head receiving pocket of a tool shank, with each clamping surface contacting a corresponding abutment surface of the pocket, and each torque transmission surface contacting a corresponding drive surface of the pocket.