A question was recently asked,” If Spiral-flute taps will work in both blind and through holes, why do I need a Spiral-point?” Sounds a bit like the lyrics to a sad Country song.
The answer to the question lies in the details of the application. Technically, all flute configurations will make threads in both “through” and “blind” holes. The decision on which is appropriate is based on producing desired chip flow. Chip evacuation is an issue that contributes heavily to the success, or failure of a tap. Also remember that flutes accommodate the volume of