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Combination of screws for pipes < screws>
There are two types of pipe screws: tapered screws for pipes and parallel screws for pipes.
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The symbols in parentheses in the above table are the symbols used in the conventional JIS
Tapered screw for pipes
Tapered screws for pipes are used in water pipes, gas pipes, and other areas where fluids or gases leak through the gaps in the screws.
Its application is called tight bonding.
A taper is a shape that gradually becomes thinner or thicker.
I think it is easy to understand if you imagine the red cone used at construction sites.
Tapered thread combinations for pipes
Male threads are one type of tapered, but there are two types of internal threads: tapered and parallel.
Whether you attach the R tapered external thread to the Rc tapered thread or the Rp parallel internal thread,
It is getting thicker and thicker, so it will definitely stop somewhere.
Pipe parallel screw
On the other hand, if dense resistance is not required, such as a protective tube for a wiring cable, parallel screws for pipes are used.
Its application is called mechanical coupling.
Combination of parallel screws for pipes
Both the internal and internal threads are parallel. The G of the parallel thread for the pipe is also the internal thread and the internal thread, and the thread symbol is G.Basically, it is based on English, but only R is said to be derived from German for some reason.
It is said that it comes from the word "Rogebinde", which means pipe screw in German.
(ANSI) ASME B1.20.1
(ANSI) ASME B1.20.3
(DIN) DIN10226-1,-2