Today, we are going to discuss the "Piping threads and connection screws (PT/PF/NPT/R/Rc/G)Here is a note about "The
It is easy to get a little confused in mechanical design when selecting piping connections and tube fittings connections, so here is a good place to start.Types of piping screws (connection screws)Note the following.
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Pipe connection screw
About taper thread PT and R/Rc for piping
Why is there confusion in the selection of connection screws for piping?In addition to the difference in the way to refer to male screws and female screws, there is a mix of manufacturers who have changed the way to refer to the old JIS standard and those who have changed the way to refer to the new JIS standard.It is. In the old JIS, taper threads for piping were "PT",In the new JIS (latest notation JISB0203), "male screw = R" and "female screw = Rc".The first two are the following.
Male thread (PT in old JIS = R in new JIS)
If you would like to purchase a piping taper screw thread,Select PT display or R(2) Select "R" to install the other side. Even if the other side displays PT, it can be attached by selecting "R".
Female thread (PT in old JIS = Rc in new JIS)
If you would like to purchase a piping taper screw thread,Select PT display or RcThe Rc is the number of the PT display. Even if the other side displays PT, it can be attached by selecting Rc.
About PF and G parallel threads for piping
There is also a difference between the old JIS and the new JIS for the PF and G designations, which are piping parallel threads. In the old JIS, parallel threads for piping were "PF",G" in new JIS (latest notation JISB0202)The first two are the following.
Male threads, female threads (PF in old JIS = G in new JIS)
If you would like to purchase piping parallel threads,Select PF display or GThe "G" is the number of the PF. Even if the other side displays PF, it can be attached by selecting "G".
About NPT (American Piping Taper Thread)
NPT is the American standard of the JIS standard taper thread for pipes (PT thread), which conforms to the international standard prevalent in Japan, and is called the NPT thread, which is the American taper thread for pipes.The NPT screw is a taper screw for American pipes and cannot be connected to the PT taper screw for JIS pipes because the angle and pitch of the peaks are different.
Incidentally, there are also parallel threads, and American plumbing parallel threads are called NPS.
Reference: NPT Standard
ANSI/ASME B.1.20.1-1983 (NPT)
Keywords for search in the blog (for personal use)
Piping screw, taper screw, piping hole, piping tap
That's it.