Discovering the difference between NPT, BSPT, or BSPP Threads

Ever wonder what the difference is between NPT, BSPT, and BSPP Threads?


Quick disconnect couplings come in a variety of end terminations, one of the most common being a pipe thread. Depending where you are in the world will determine which standard pipe thread is commonly used. Your application can also determine which type of pipe thread is needed based on the location of the customer base.


NPT (National Pipe Thread)


National Pipe Thread Taper is the most popular type of thread used in the United States and Canada for tapered threads used on threaded pipes and fittings. Unlike straight threads that you find on a bolt, a taper thread pulls tight and therefore makes a fluid-tight seal.


BSPT (British Standard Pipe Thread)


Very similar to NPT, British Standard Pipe Threads are standard screw thread types that have been adopted internationally for interconnecting and sealing pipe ends. They are most popular in China, Japan and some of the European countries.


BSPP (British Standard Parallel Pipe)


British Standard Parallel Pipe Threads are the most popular type of thread used in the UK, Europe, Asia, Australia, New Zealand and South Africa. These are parallel thread fittings that are very similar to BSPT Threads but are not tapered.


LinkTech Couplings offers NPT (National Pipe Thread), BSPT (British Standard Pipe Thread) and UT (Universal Thread) thread configurations. There are several custom thread configurations that LinkTech has done in the past such as SAE flare fittings and BSPP (British Standard Parallel Pipe) Threads. For other thread types, please contact LinkTech Couplings for quoting.



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