Double-Sided Cutting Insert Having a Circular Shape and Cutting Tool Using the Same

A cutting tool, comprising:

• a tool body having at least one pocket;
• and
• at least one double-sided cutting insert releasibly fixed to the pocket, the cutting insert comprising:
• a circular top surface, a bottom surface shaped to be identical to the top surface, a cylindrical side surface for connecting the top and bottom surfaces, and cutting edges formed between the top and side surfaces and between the bottom and side surfaces;
• wherein the side surface of the cutting insert has a plurality of rotation prevention surfaces substantially perpendicular to the top and bottom surfaces in the circumferential direction of the side surface,
• wherein the pocket of the tool body comprises:
• a pocket bottom surface in which the top surface or the bottom surface of the cutting insert is seated;
• and
• a pocket side surface in which the side surface of the cutting insert is seated;
• and
• wherein a protruding surface is formed in the pocket side surface for being mated with one of the rotation prevention surfaces of the cutting insert to prevent the rotation of the cutting insert.