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What’s the difference between BSP and NPT?


BSP and NPT are two common pipe threads. Their functions are exactly the same. They are used for the connection of pipe joints, and the two threads are universal in use worldwide. What is the difference?


  • Depending on the region of use. BSP is mostly used in Europe and the Commonwealth of Nations, and is a U.K. standard. NPT is the American standard pipe thread.
  • Tooth angle is different. NPT is a 60° tapered pipe thread, while BSP thread is a tapered thread with a 55° sealed pipe thread.
  • The pitch is different. In the case of the same nominal size, the NPT thread has a higher tooth height and a larger pitch.


NPT is the American Standard Taper Pipe Thread for general use. N means National (American) American national standard, P means Pipe, T means Thread, and the thread angle is 60°.


BSP is a British pipe thread, where B means British, S means Standard, and P implies Pipe. The thread angle is 55°, and the thread has a taper of 1:16. For BSP thread, now, for more convenient use, it is classified as a classification under ISO7/1. For details, you can refer to this article.


In actual use, it is actually very easy to distinguish between the two threads. We lightly touch the threaded surface with our fingers, and NPT is sharper than BSP. Of course, you can also use tools such as gauges and handy gauges to make distinctions.

In all the product series produced by JINSON Fittings, we provide both BSP and NPT threads. You can check our catalogue for specific products. You can click here to communicate with our sales for more details.

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