The cutting tap is actually an invention of the marketing of the 1970s. At that time, the DIY stores were in a phase of great expansion and threading tools found their way into the assortments of these self-service stores. The idea behind it was to present an inexpensive internal thread tap. It should be sufficient for short through holes and for retapping threads and the customer only had to buy one tap instead of the three-part set with pre, medium and finishing tap. The marketing strategists wanted the name to make it clear that a whole thread can be cut with just one cut.
Technically, this has been achieved by combining the long lead of the taper tap with the full thread of the finished tap.
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