Patent ID: 7147413
Filing Date: 2006-12-12
Classification: B23G,Y10T

Abstract:
1. A precision cemented carbide tap, comprising: an axially rearward end including a cylindrical shank; and an axially forward end including a threaded body portion and a threaded cutting chamfer portion, wherein said precision cemented carbide tap is coated with a first wear resistant layer of metal nitrides, carbides, carbonitrides, borides and/or oxides, and wherein the metal is chosen from one or more of the following: aluminum, silicon and the transition metals from Groups Iva, Va, and VIa of the Periodic Chart, and wherein the cylindrical shank is held by precision hydraulic holders during grinding such that the threaded body portion and the threaded cutting chamfer portion are concentric to the cylindrical shank within a runout of 10 microns.