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Thread Difference Between BSPT, BSPP & NPT

Views: 825     Author: Site Editor     Publish Time: 2021-08-14      Origin: Site

Thread Difference Between BSPT, BSPP & NPT

Thread Difference Between BSPT, BSPP & NPT

barrel nipple half nipple

There are three different thread types: BSPT, BSPP & NPT thread, the thread type have a little difference and Different thread sealing depending on the geographical region,size of the pressure system and the environment. Fox example, In Asia, such as China, Korea, Japan etc normally use BSPT; In U.S, Canada etc always use NPT, then for BSPP thread most popular in UK, Europe, Australia, New Zealand and South Africa. While one sealing style is not inherently better than another each style has its application.

How to divide them and know your choice ? Pls see below information:

1. NPT Connections ( National Pipe Thread)- US & Canada

It is according to ANSI/ASME B1.20.1 Pipe Threads. 60 degree of thread angle. NPT male adapters have a taper thread that wedges into the female NPT adapter.


2. BSPT Connections (British Standard Pipe Taper)- China, Korea, Japan

BSPT thread is similar to NPT except for one important difference. The angle across the flanks of threads is 55 degrees instead of 60 degree as it is for NPT thread. Thus an NPT male thread could fit into BSPT female thread, but couldn’t sealing.


3. BSPP Connections ( British Standard Pipe Parallel)- UK, Europe, Australia,South Africa

BSPP thread is also British standard, BS 21:1985 parallel thread. It is a parallel thread fitting that uses a bonded seal ring to do the sealing. For historical reasons, BSPP has other different names at the same time. Such as BSPF ( British standard pipe fitting), BSPM(British Standard Pipe Mechanical) and PS (British Standard Pipe Straight) and so on.


BSPT & BSPP both referred to as BSP, so most of our customer maybe only told you needs BSP thread. Normally for female thread, 99% is BSPP. For male thread, BSPT & BSPP, 50%.

1) BSPP male thread could 100% connected with BSPP female thread,but NOT MATCH BSPT Female Thread


2) BSPT male thread couldn't 100% connected with BSPP female thread, needs using PTFE tap.


For our thread valves & thread fittings, thread standard always most important for manufacture.

So please pay more attention about these difference.


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