Spiral wire tapping more CNC machining center for blind hole, processing speed, high precision, chip better, neutral good, spiral wire tapping more suitable viscous materials such as easy to stick crumbs thread processing, especially for threaded hole aluminum, copper, zinc alloys and other materials processing. A method of processing internally threaded tool, axially open grooves. Also called taps. Tap into the straight flute tap, spiral point and spiral flute tap tap according to its shape. Straight flute taps easily processed, precision slightly larger yield. Generally used lathe, drilling and tapping machine screw machining, cutting speed is slower. Spiral flute tap used for CNC machining centers blind hole drilling, processing speed, high precision, chip better, neutral good. Spiral point tap the front of tolerance cut grooves for processing via. Tap tap mostly coating plant to provide tools now, compared with uncoated taps life and cutting performance has greatly improved