The HPF extruding tap of FETTE company is formed by two parts, one part is to have tall turn round tigidity " stretch " steel qualitative knife handle, another part is to use the extruding knife head that exceeds material of fine grained hard alloy to be made. Extruding knife head used TiCN-PLUS coating technology, have good wear-resisting function and the join property with steeliness knife handle, can deliver the tall torque of the generation when extruding thread machining by knife head to arbor, undertake machining with higher cutting rate thereby. HPF tap is had inside cooling function. Divide metric tooth model outside, still Whitworth is in charge of whorl and UNF tooth model. Treatment of use extruding tap can control the stability of dimension not only, and the exterior quality that still can assure workpiece, but premise is beforehand bore diameter must satisfy precision requirement, rolled out the HPF broach that can cooperate to use with HPF tap for this FETTE company, can utmost ground assures thread machining quality. CNC Milling