Please tell us what types of parallel threads and tapered threads for pipes are currently in use.
G thread
The current JIS standard for parallel pipe threads includes the "G thread" introduced by ISO (international standard).
The conventional JIS "PF thread" is specified in the appendix of the current JIS standard, but some sizes and grades are not specified.
For details, please refer to the table below and JIS B 0202.
R thread
Taper pipe threads are commonly known as "R threads" that were introduced by ISO (international standard) in the current JIS.
A tapered female thread that mates with an "R male thread" is called an "Rc female thread", and a parallel female thread is called an "Rp female thread".
The conventional JIS "PT thread" is specified in the appendix of the current JIS, but some sizes are not specified.
A parallel female thread that mates with a "PT male thread" is called a "PS female thread".
For details, please refer to the table below and JIS B 0203.
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