Cutting tool

1. A cutting tool (10) comprising: holder (12) plate having a front end (51) and comprising: socket (44) at the forward end plate (51), the shank (46) extending from the back seat (44) for the plate, and the first and second surfaces (50, 52) of the holder extending backward from the front end (51); wherein the socket (44) for the plate comprises: major surface (58) disposed between the second surface (52) of the holder and the imaginary plane M passing through the first surface (50) of the holder; an opening (62) slot, which opens outwardly towards the main surface (58); first and second main bearing surfaces (72, 74) extending from the major surface (58) and located on opposite sides of the opening (62) slot, wherein the first major support surface (72) is closer to the front end (51) than the second main abutment surface (74); and an auxiliary support surface (76) extending from the major surface (58) and positioned further from the front end (51) than the first major support surface (72), wherein the auxiliary support surface (76) transverse to the first and second main bearing surfaces (72, 74); and an indexable cutting insert (14) fixed in the socket (44) for the holder plate (12) of the plate, wherein the cutting insert (14) comprises: first and second side surfaces (18, 20) and a peripheral surface (22) extending therebetween; two cutting portions (26) located at opposite ends of the insert (14); an opening (24) of the plate, opens out at both side surfaces (18, 20), the opening (24) of the plate has a aperture plates S axis about which the cutting insert (14) has 180 ° rotational symmetry; Two major thrust surface (36) extending from the second side surface (20) and located on opposite sides of the opening (24) of the plate, wherein each major abutment surface is closer to the one cutting portion than the other cutting portion; first and second auxiliary abutment surfaces (38 ', 38' ') extending from the second side surface (20), and a top view of the second side surface (20) first and second auxiliary abutment surfaces (38', 38 '') transverse to the two main thrust surfaces (36); and Two major abutment surfaces associated with one main abutment surface (36) and one secondary abutment surface (38 ', 38' '(34) spaced from the second side surface (20) and turn away from it, each primary abutment surface (34) ); and: abutment surfaces (34, 36, 38 ', 38' ') are useful for organizing the first and second plurality of abutting surfaces of plates having a partly coinciding composition, wherein only one set is operable at a predetermined time, wherein the first set comprises two main bearings surface (34), two major thrust surface (36) and the first auxiliary abutment surface (38 '), the second set contains two major thrust surface (34), two major thrust surface (36) and a second auxiliary abutment surface (38' ') ; and and: two primary abutment surfaces (34) abut the main surface (58) of the holder (12) of the plate; the first of the two main thrust surfaces (36) abuts the first major support surface (72); the second of the two main thrust surfaces (36) abuts the second major support surface (74); and one of the auxiliary abutment surfaces (38) abuts the auxiliary support surface (76). 2. The cutting tool (10) according to claim 1, wherein the main thrust surface (34) parallel to the second side surface (20). 3. The cutting tool (10) according to claim 1, wherein the main and auxiliary abutment surfaces (36, 38 ', 38' ') are flat. 4. The cutting tool (10) according to claim 1, wherein the main and auxiliary abutment surfaces (36, 38 ', 38' ') perpendicular to the second side surface (20). 5. The cutting tool (10) according to claim 1, wherein a top surface of the second side (20), the main thrust surface (36) parallel to one another and to the longitudinal axis A1 of the insert plate (14), a longitudinal axis A1 and passes through the plate axle S through the hole plates and cutting portions (26). 6. The cutting tool (10) according to claim 1, wherein the major thrust surface (36) facing in opposite directions. 7. The cutting tool (10) according to claim 1, the cutting insert (14) further comprises two supporting beams (32 ', 32' '), which protrude from the second side surface (20), each support beam has formed on it a major thrust surface (34), one major thrust surface (36) and an auxiliary abutment surface (38 ', 38' '). 8. The cutting tool (10) according to claim 1, wherein the main surface (58), the first and second main bearing surfaces (72, 74) and the auxiliary support surface (76) are flat. 9. The cutting tool (10) according to claim 1, wherein the first and second main bearing surfaces (72, 74) and the auxiliary support surface (76) perpendicular to the main surface (58). 10. The cutting tool (10) according to claim 1, wherein: hole (62) has an axis P nest nest holes; and in a top major surface (58), the first and second main bearing surfaces (72, 74) are parallel to one another and parallel and are arranged on both sides of the longitudinal axis A2 of the holder, and A2 tool holder longitudinal axis extending through the axis P nest openings and through the shank (46 ). 11. The cutting tool (10) according to claim 1, wherein the first and second main bearing surfaces (72, 74) face in opposite directions. 12. The cutting tool (10) according to claim 1, wherein: first and second main bearing surfaces (72, 74) are arranged on the longitudinal protrusion (60) protruding from the major surface (58). 13. The cutting tool (10) according to claim 12, wherein the main surface (58) comprises: upper main bearing surface (58a) on one side of the longitudinal protrusion (60); and lower base support surface (58b) on the opposite side of the longitudinal protrusion (60). 14. The cutting tool (10) according to claim 13, wherein only the upper main bearing surface (58a), the lower main bearing surface (58b), the first and second main bearing surfaces (72, 74) and the auxiliary support surface (76) are made to support a thrust surface formed on the insert when the insert is mounted in the socket (44) to the plate. 15. The cutting tool according to claim 1, wherein: the main surface (58) comprises an upper main support surface (58a) and a lower base support surface (58b); the first of the two main thrust surfaces (34) abuts the upper main support surface (58a); and the second of the two major abutment surfaces (34) abuts the bottom surface of the main support (58b).