Abstract: A tool holder having a cutting insert comprising an upper face having a pair of protruding surfaces, i.e. an abutment surface for clamping of the insert by means of a screw in a tool holder, and a deflection surface for deflecting chips away from the screw.

Abstract: The cutting insert (10) has an upper face (1) having a pair of proud surfaces (13B, 13X), namely an entrainment stop surface (13B), for stopping the entrainment of the insert (10) by a slide (81) of the tool holder (101) into a mounting position, and, further to the front, a deflection surface (13X), for deflecting the path of chips away from a direction (13F) going from a rear edge of a disengagement surface (13D) to the entrainment stop surface (13B).

Abstract: The inventive reversible cutting insert comprises the part of a front layer (1A) provided with the lateral faces of a front circumference (3A, 4A, 5A, 6A) defining together with a large front face (1) a given number of cutting edges (13a, 13b; 14a, 14b; 15a, 15b; 16a, 16b) and the part of a rear layer (1B) provided with lateral faces of a rear circumference whose at least certain faces are embodied in the form of faces supporting a frame (3B, 4B, 5B, 6B) on the walls of a toolholder housing (30), wherein the number of the frame supporting faces (3B, 4B, 5B, 6B) is less than the number of cutting edges (13a, 13b; 14a, 14b; 15a, 15b; 16a, 16b).