The first end tapping is mainly used for the thread cutting of various through hole materials. The apex wire attack has the same straight grooves in the general hand wire attack, but there is a specially designed spiral groove at the front end of the cutting part, so as to spin and push the chip away from the bottom of the hole. Because of the function of rotating and discharging chips, the precursor can not only keep the grooves clean, but also reduce the resistance when cutting, and avoid the damage of wire attack due to chip blockage. Therefore, the pre - end tapping can be used to cut high precision threads at a faster speed than the ordinary hand.
·Screwdriver precision grade：YAMAWA P level
·Screwdriver material：HSS-E
·The number of teeth in the cutting edge: 5 teeth
·surface treatment：PO/N+PO[OX]-Acidification treatment，PO/N+PO[V]-Titanium complex treatment(TiN)
·Suitable for cutting material. Suitable for cutting material: medium and low carbon steel, alloy steel, copper, aluminum, magnesium alloy, etc. under 750N/mm2 tensile strength...