Material used exclusively in the manufacture of cylindrical thread rolling dies or planetary thread rolling dies for "soft" applications, i.e. applications with a low mechanical demand. K material has been developed by HEROSLAM along with the leading producers of special steels in order to offer our customers the best alternative to D2 material on the market in terms of both quality and performance. The K material's increased resistance to wear and tear extends the service life of our customers' tools, in addition to offering a greater consistency of the main dimensions of threaded parts. HEROSLAM recommends using K steel to thread parts with a hardness of less than 28HRC. Likewise, using K is NOT recommended for threading stainless steel parts.