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Inst Tools > Blog > eBooks > What is Parallel Thread Pipe Fittings ?

What is Parallel Thread Pipe Fittings ?

Last updated: July 16, 2017 2:26 pm
Editorial Staff
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An alternative to tapered threads in pipe joints is the use of parallel threads, similar to the threads of machine screws and bolts. Since parallel threads are incapable of forming a pressure-tight seal on their own, the sealing action of a parallel thread pipe fitting must be achieved some other way. This function is usually met with an O-ring or gasket.

In the United States, a common design of parallel-thread pipe fitting is the SAE straight thread, named after the Society of Automotive Engineers:

SAE Straight Thread

Sealing is accomplished as the O-ring is compressed against the shoulder of the female fitting. The threads serve only to provide force (not fluid sealing), much like the threads of a fastener. Another parallel-thread pipe standard is the BSPP, or British Standard Pipe Parallel. Like the BSPT (tapered) standard, the thread angle of BSPP is 55 o . Like the SAE parallel-thread standard, sealing is accomplished by means of an O-ring which compresses against the shoulder of the matching female fitting:

BSPP Thread

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