Patent ID: 7413257

Claim:
A rotatable cutting tool for use in a mining or road planing holder having a central bore, said rotatable cutting tool comprising: a cutting tool body and a hard tip affixed to said cutting body, said cutting tool body having an axial forward end containing a socket and an axial rearward end, a cylindrical neck portion rearward of the forward end, a clearance portion axially rearward of the neck portion, a mediate portion axially rearward of the clearance portion, a shank portion axially rearward of the mediate portion and the cutting tool body having an axial length; wherein said hard tip is affixed to said cutting tool body in said socket, wherein said clearance portion has an axial forward generally circular cross section having an axial forward diameter and an axial rearward generally circular cross section having an axial rearward diameter, said axial forward diameter being greater than the axial rearward diameter and the axial length of said clearance portion equal to between about ten percent to about thirty-five percent of the axial length of the cutting tool body, wherein said mediate portion has a forward frusto-conical section, and a cylindrical section axially rearward of said forward frusto-conical section; wherein said mediate portion forward frusto-conical portion increases in diameter from adjacent said clearance portion to said mediate portion cylindrical section; and wherein only said shank portion of said cutting tool body is insertable into said central bore of said mining or road planning holder.