British Standard Pipe (BSP) is a set of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings by mating an external (male) thread with an internal (female) thread. It has been adopted as standard in plumbing and pipe fitting, except in North America, where NPT and related threads are used.
The final step in identifying your thread type is to identify the thread type standard. NPT, PT, and G are all examples of thread type standards. Gather the information from the previous steps and compare it with the measurements in the tables below. You can also download all this information in a convenient PDF file.
British Standard Pipe.pdf
Pipe thread is also different. The standard tapered pipe thread in the US is the NPT or National Pipe Thread. The British use the BSP or British Standard Pipe thread. Although similar, again, they should NOT, under any circumstances, be interchanged. The sad part of this thread confusion is the fact so many classic British cars, motorcycles, and yes, even airplanes have been butchered over the years by those not conversant with these thread systems (detailed later in this article).
Standard British O-Rings sizes. Tolerances vary by use, please see out tolerance pages. Thousands of non-standard sizes are available in stock or can be made within a few weeks typically without tooling fees so no need to settle for a less than optimal fit.
These are pipe threads where pressure-tightness is made through the mating of two threads together. They always use a taper male thread but can have either parallel or taper female threads. (International standards require all female threads to be parallel.)
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