Face milling tool and a tangential cutting insert therefore

A face milling tool for chip removing machining comprising:

• a tool body being rotatable around a central rotation axis in a direction of rotation, the central rotation axis defining an axial forward-rearward direction, the tool body including an envelope surface being concentric with the central rotation axis and an axial front end surface extending transverse to the central rotation axis, the axial front end surface being the axially forward-most surface of the tool body, the axial front end surface having a plurality of seats;
• and
• a plurality of tangential cutting inserts, each of the plurality of tangential cutting inserts being mounted in corresponding ones of the plurality of seats, each of the plurality of seats including a plurality of support surfaces for rotationally locking and supporting one of the plurality of tangential cutting inserts respectively in one of the plurality of seats, one of the plurality of support surfaces of each of the plurality of seats being a flat axial support surface for supporting one of the plurality of tangential cutting inserts in an axial direction defined by the central rotation axis, the flat axial support surface of each of the plurality of seats extending perpendicular to the central rotation axis and situated at an axially forward-most portion of the tool body at the axial front end surface, the flat axial support surface being co-planar with the axial front end surface, wherein each seat of the plurality of seats is provided with a recess in relation to the flat axial support surface, the recess including a bottom surface and a side wall, the side wall forming non-circular side support surfaces for rotationally locking and supporting one of the tangential cutting inserts in a direction perpendicular to the axial direction, each of the plurality of tangential cutting inserts including an axial back side having a flat axial contact surface abutting the flat axial support surface and a projecting member extending axially from the flat axial contact surface, the projecting member including a circumferential side surface forming non-circular side contact surfaces abutting the non-circular side support surfaces, wherein a gap is provided between the bottom surface of the recess and the projecting member of the tangential cutting insert mounted in a respective seat, wherein there are exactly two non-circular side support surfaces in the side wall of the recess, wherein the circumferential side surface of the projecting member forms exactly two non-circular side contact surfaces abutting the exactly two non-circular side support surfaces.