Patent ID: 7476063

Claim:
A threading insert, comprising a cutting edge, and wherein the insert comprises an insert supporting surface and a clamping surface for clamping the insert relative to a toolholder such that the insert supporting surface supports the insert against an abutment surface of the toolholder, and at least one layer of PCBN defining an entire face of the insert, the cutting edge extending at least partially around a periphery of the insert and being formed in the PCBN layer, the insert having a blunt end and a length-to-width ratio of less than about 1.7:1, wherein, during machining of a workpiece with the threading insert, a temperature of 700° C. to 800° C. is adapted to be generated at the cutting edge, wherein the cutting edge is defined by the blunt end and includes a first, straight edge portion and, at opposite ends of the first edge portion, two edge surfaces, each edge surface of the two edge surfaces defining an obtuse angle with the first edge portion.