A threading tap for cutting threads in blind holes and method of manufacture

摘要

A threading tap for cutting threads in blind holes comprises an elongated body (2) with a central axis (A-A) and having at a first end (6) a connector portion (4) and at a second end (10) a threading portion (8), said threading portion being provided with at least one helical thread (16) about the circumference of said body and interconnected flank portions (14) defining at least one helical flute (12) from the region of said second end (10) towards said first end (6) and interrupting said helical thread (16). In accordance with the invention, the flank portions (14) are steam tempered. The invention also relates to methods of the manufacturing such a tap.