A CUTTING TOOL

A cutting tool comprising a body (100) and a circular cutting insert (200) mounted in an insert seat (104) of the body (100), the cutting insert comprising an anti-rotation stopping indent (205) formed in a transition between a bottom surface (202) and a side surface (203) of the cutting insert and comprising a first stop surface (206), the insert seat comprising at least one anti-rotation stop (108), which protrudes with respect to a side wall (107) of the insert seat and comprises a second stop surface (109), a concavely curved first duct (110) separating the second stop surface from the side wall. The anti-rotation stop is adapted to inhibit rotation of the cutting insert in the insert seat by contact between the first and second stop surfaces. The second stop surface is completely located within the anti-rotation stopping indent when the cutting insert is mounted. Seen in a section perpendicular to a common central axis, an angle of less than 180° is formed between a tangent to the second stop surface and a tangent to the first duct at a transition between the two.