Difference between G and PF

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

Can you tell if "G" internal parallel pipe threads are the same as "PF"? Which type of pipe taps should I use, "G taps" or "PF taps"? Please explain the difference between "G" and "PF" taps.

The internal parallel threads "G" is basically the same as "PF".
The symbol of the threads have been changed from "PF" to "G".
(Note: The "B" class internal threads defined in "PF" standard was obsoleted for the "G" standard)
YAMAWA "PF taps" and "G taps" for parallel pipe threads have different overall and thread lengths, but have the same class of fit in the thread form, so you can use these taps for both internal parallel pipe threads, "PF" and "G".

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