Patent ID: 6872034

Claim:
A tangential cutting insert comprising: two identical opposing end surfaces having 180° rotational symmetry about a first axis A 1 passing therethrough, a peripheral side surface extending between the two opposing end surfaces, and a peripheral edge formed at the intersection of each end surface and the peripheral side surface, at least two sections of each peripheral edge constituting cutting edges, the peripheral side surface comprising: two identical opposing major side surfaces having 180° rotational symmetry about a second axis A 2 passing therethrough, the second axis A 2 being perpendicular to the first axis A 1 ; two identical opposing minor side surfaces having 180° rotational symmetry about a third axis A 3 passing therethrough, the third axis A 3 being perpendicular to the first axis A 1 and the second axis A 2 ; a minor plane P 1 defined by the first axis A 1 and the second axis A 2 ; a major plane P 2 defined by the first axis A 1 and the third axis A 3 ; a median plane M being defined by the second axis A 2 and the third axis A 3 ; each end surface having four corners, two lowered corners and two raised corners, the lowered corners being closer to the median plane M than the raised corners; each end surface being provided with at least one projecting abutment member having a projecting abutment surface, wherein in a side view of either major side surface, the projecting abutment surface lies on a concave surface.