Which combination of taps is commonly found in a standard set of imperial taps?

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In threading for imperial sizes, you typically use three taps in sequence to cut a full-depth thread. The taper tap starts the thread gradually, easing alignment and reducing tool deflection. The plug tap continues the cut deeper into the hole, expanding the threaded length. The bottoming tap finishes the remaining threads to full depth, which is essential for blind holes. A standard imperial tap set is built with these three types so you can start, progress, and finish a thread properly. Using only one type wouldn’t allow you to start and finish the thread in a blind hole, and a straight tap isn’t the usual complete set for this purpose.