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Pipe taper gauge (R and PT) are not differentiated by accuracy class.
There is a distinction between parallel screws for pipes gauge (G and PF).
G screw, which is a parallel screw for ISO pipe
Internal thread : No distinction between precisions (only one type)
External thread : There is a distinction between A and B grades.
PF screws, which are conventional JIS parallel screws for pipes
Internal thread : There is a distinction between A and B grades.
External thread : There is a distinction between Class A and Class B
(FAQID:222)