Abstract: In order to improve cutting insert economy with simplified manufacture, an exchangeable insert (1) is configured generally symmetrical in the form of a four-cornered plate with four cutting edges (4) in the corners respectively and with plane-parallel abutment surfaces (5) disposed between the cutting edge portions and at right angles to each other. All of the cutting edge portions are mutually identical to each other, and each cutting edge portion is symmetrically formed about a bisector which passes through a circular center hole in the insert. This is provided in order to achieve a high degree of accuracy with respect to position and direction when attaching the cutting insert to the holder (3).

Abstract: In thread cutting and slotting, indexable inserts of hard metal are now used. Usually, the inserts used have been of triangular type. In order to improve cutting economy, implying improved positioning, closer tolerances, and increased strength, an insert (1) has been developed for use in, for example, internal thread cutting, said insert (1) being formed with two cutting edges (2, 2') on a bevelled cutting body (1, 3). Since the cutting body (1) is located on a cutting column (10), the cross section of which is symmetrical, the insert with the cutting body (1) and the cutting column (10) may be reversed half a turn with essentially retained directional geometry. The insert (1, 10) has a plurality of plane guiding and contact surfaces (5, 5', 6, 6', 14, 14') adapted to match the corresponding plane guiding and contact surfaces in an insert holder (13) in order to achieve correct positioning of the indexable insert in the insert holder.

Abstract: In thread cutting and slotting, indexable inserts of hard metal are now used. Usually, the inserts used have been of triangular type. In order to improve cutting economy, implying improved positioning, closer tolerances and increased strength, the insert (1) is formed with four cutting edges (2) with intermediate contact surfaces (4, 5) and is adapted for vertical mounting in an insert holder (9). Through this design, the cutting forces will be absorbed in a large angular area of the cutting edges, and the cutting forces will essentially act in the plane of the insert.