Cutting insert and tool for chip removing machining

Indexable milling insert having parallelepipedic basic shape intended to be tangentially mounted in a milling body, the cutting insert comprising a mounting hole placed centrally in the cutting insert, a first support side and a second support side, which support sides are essentially parallel with each other and act as alternating support sides, the mounting hole mouthing in the support sides, the cutting insert being provided with main cutting edges, which are orientated perpendicularly to the centre axis of the mounting hole as well as provided in such a way that a rotation of the cutting insert around the centre axis of the mounting hole or a turning of the cutting insert to an alternative insert seat provides an identical location of the main cutting edges in relation to a piece to be machined, wherein the cutting insert comprises four identical sides for chip removing machining, that the sides extend between the essentially parallel support sides, and that each side has exactly two cutting edge areas, each said cutting edge area also having a minor cutting edge, wherein an imaginary extension line of a minor cutting edge for a chosen cutting edge area is spaced by a distance from an adjacent additional minor cutting edge and in that the adjacent additional minor cutting edge is comprised in a cutting edge area that faces away from the chosen cutting edge area.