Description

Taps and dies are tools used to create screw threads, which is called threading. ... A tap is used to cut or form the female portion of the mating pair (e.g. a nut). A die is used to cut or form the male portion of the mating pair (e.g. a bolt). To use a tap, choose the size that is appropriate for the size of the bolt or the hole you want to thread. Place the tap into the special wrench and tighten it in. Then, place the cutting end of the tap over the hole and turn. Use cutting oil to lubricate the tap. Bottoming tap or Bottoming tap. The tap illustrated in the top of the image has a continuous cutting edge with almost no taper between 1 and 1.5 threads of taper is typical.This feature enables a bottoming tap to cut threads to the bottom of a blind hole. A bottoming tap is usually used to cut threads in a hole that has already been partially threaded using one of the more tapered types of tap; the tapered end ("tap chamfer") of a bottoming tap is too short to successfully start into an unthreaded hole. In the US, they are commonly known as bottoming taps, but in Australia and Britain they are also known as plug taps. Intermediate tap, second tap, or plug tap The tap illustrated in the middle of the image has tapered cutting edges, which assist in aligning and starting the tap into an untapped hole.