Basic Diameter Position when processing with a Tapered Pipe Tap-Hand Tapping

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Cutting Taps Pipe Threads Standard (Screw Threads, Center Holes)

I am hand tapping a PT 1/4-19.
Unlike machining, I am unable to set the tap insertion depth by using a scale setting.
I am not sure how deep I should insert the taps into the workpiece. Is there any simple way for me to know how deep I should insert the tap?

PT taps have specific lengths from the tip to the basic major diameter, but they do not have a mark on the tap for this. Regarding PT1/4 (long thread type), you can make the standard-compliant PT internal taper pipe threads by driving the tap 21mm from the tip of the tap into the bored hole. Please put a mark on the position before tapping. Please refer the common usages on the attached PDF file.

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