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What’s Plain thread (General purpose metric
screw thread) and Pipe thread?
thread is also called General purpose metric screw
thread, it is mainly used to joint equipment parts, thread angle is 60 degree, and
it is named M thread.
Pipe thread is mainly used to joint pipeline, thread angle is 55 degree, and there are two types of pipe threads:
(1) Non-sealing pipe thread: it is named G thread, the male and female threads
are all cylinder shaped threads. A male G thread and female G thread together
do not have sealing effect, it is mainly used in wire tube / cable tube which
do not require sealing effect.
(2) Sealing pipe thread, these kinds of thread have sealing effect after screwed. There are three types of sealing pipe threads:
R thread: tapered male thread
Rc thead: tapered female thread
thread: parallel female thread
Rc thread plus R thread can produce sealing
effect, Rp thread plus R thread can also produce sealing effect. They are
mainly used in water pipe, gas pipe and oil pipe which require sealing effect.
Thread fitting product list see here: http://www.pursueplumbing.com/threaded-fittings.html
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