A spiral groove tap is a tool for machining threads. It is a type of tap, so named because of the spiral shape of its chip groove. Spiral groove taps are divided into left-hand spiral groove taps and right-hand spiral groove taps. The geometrical parameters of spiral groove taps are mainly reserved Read More

1, Fill some lubricating oil, use a sharp pin or chopper to slowly knock out the broken surface in the reverse direction, and reverse the iron sharpening from time to time (the most common method in the workshop, but it may not be suitable for threaded holes with too small apertures or broken taps that are too long, but you can try). Read More