Patent ID: 7004692

Claim:
A rotary cutting tool having a forward end and a rearward end and a longitudinal axis A passing through the forward and rear ends, the cutting tool comprising a cutting head, a screw member and a tool shank; the cutting head comprising a generally cylindrical main body portion and a rearwardly extending conical portion, and an axially directed through bore having a bore surface; a plurality of axially extending and inwardly radially protruding locking wings each having a sloping locking surface protruding from the bore surface; an axially extending stopper having a tangentially facing stop surface, protruding from each locking wing; the screw member comprises a plurality of axially extending and outwardly radially protruding clamping wings on a forward end thereof and an external screw thread rearward of the clamping wings, each clamping wing having a sloping clamping surface, and each clamping wing having an associated side abutment surface; the tool shank having a receiving bore opening to a forward end thereof and comprising a conical forward portion and an internally threaded portion rearward of the conical portion; wherein, the external screw thread of the screw member is in threaded engagement with the internally threaded portion of the tool shank, the conical portion of the cutting head is located within the conical portion of the tool shank, the clamping wings and locking wings are aligned in pairs with the locking and clamping surfaces of each pair in abutment, and with each stop surface in abutment with a given side abutment surface.