Patent ID: 7553114

Claim:
A thread cutting tap having an elongated body, the body comprising at a first end thereof a connector portion adapted to be connected to a tool and at a second end thereof a threaded portion for cutting a thread in a surface of a workpiece, said threaded portion being provided with at least two cutting edges extending in the circumferential direction of said body, each of said cutting edges comprising an integral peripheral part of a flank portion of said body and extending substantially radially from the longitudinal extension of said body, said flank portions defining between themselves at least one chip removal flute extending generally in the longitudinal extension of said body for removal of chips, at least one of said flank portions having a side wall forming part of said at least one flute, said at least one flute provided with a chip-breaking member, wherein at least a portion of said at least one flute being helically shaped, and wherein at least a portion of the chip breaking member is located in the portion of the at least one flute that is helically shaped, wherein said side wall, as viewed in a cross section oriented perpendicularly to a longitudinal axis of said elongated body, is divided into a pair of elongated concave surfaces separated by an elongated ridge constituting the chip-breaking member, and wherein the elongated ridge on a trailing, non-cutting surface of the flute comprises an edge formed by the immediate interconnection of said concave surfaces.