Because of the different relationship between the shape of the cutting object and the location of the tapping, when using NC, MC and other tapping machines to attack the teeth, the wire attack is sometimes not enough, so we need to use lengthened wire attack. There are three kinds of long wire attack: lengthening the straight slot [LS-HT], lengthening the spiral [LS-N-SP], and lengthening the first [LS-N-PO], and so on.
·Screwdriver precision grade：YAMAWA P level
·Screwdriver material：HSS-E
·Tooth number of cutting edge：LS-HT-[1.5tooth/5tooth]，LS-HC-SP-[2.5tooth]，LS-N-PO-[5tooth]
·length：L-70mm/100mm/120mm/150mm/200mm
·Suitable cutting material：tensile strength750N/mm2Light alloys, such as carbon steel, alloy steel, copper, aluminum, zinc, and so on。