Tap and die

In the context of threading, taps and dies are two classes of tools used to create or repair screw threads. A tap is used to cut or form the female portion of the mating pair. A die is a cutting tool used to cut the male portion of the mating pair.

The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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