In article ,
Australopithecus scobis wrote:

Greetings,
Recently someone here pointed out that hexagonal dies are for
rethreading and that the OP needed the round die for his
threading application.

Are there also two types of taps, threading and rethreading?

You can make a rethreading tap EZ by cutting a slot in a bolt or
grinding the end to a suitable shape

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