Patent ID: 7150588
Filing Date: 2006-12-19
Classification: B23G,Y10T

Abstract:
1. A thread-forming tap comprising an elongated body having a first axial end section and an opposite second axial end section; the first end section including a connector portion; the second end section having a thread-forming portion for forming a thread in an interior wall of a workpiece; the thread-forming portion comprising at least one thread-forming thread separated by a first helical groove, said thread-forming thread having a non-circular cross section including at least three lobes adapted to physically deform the workpiece interior wall while forming an internal thread therein; wherein the second end section defines a terminal end at which there is disposed at least one generally radially extending cutting edge for cutting parts of the workpiece interior wall; the second end section further including a thread relief portion disposed between the thread-forming portion and the terminal end, the thread relief portion comprising a thread in the form of a truncated ridge separated by a second helical groove; the truncated ridge defining a circular cylinder.