A screw tap (also known as a thread tap) is an essential tool for thread machining. It can be classified by structure into straight flute, spiral flute, and spiral point taps. Straight flute taps are suitable for general materials, while spiral flute ones excel at chip removal in blind hole machining. Spiral point taps boost efficiency in through-hole processing. Choosing the right screw tap / thread tap based on materials and hole types ensures precise, smooth threading and reduces tool wear.