There are 2 types of threads which are use for Pipe threading or in screw Pipe Fittings, Fasteners and hydraulic systems.
- NPT threads
- BSP threads.
NPT thread is also known as National Pipe threads. It’s an American Pipe thread standard for the Pipe. Its s also known as MNPT, NPT, NPT, external thread for Male Pipe Fittings, external male threads and also FPT. NPT (F) is used for Female Internal thread. Usually top protect the thread from getting leak sealant is use but with PCFSCT threads you don’t even need to use the sealant, as it perfectly get connected with female fitting and there is no chance for Pipe to get the leak. It doesn’t depend on the die of the Pipe but the thread size. All the threads have the same pitch, angled as per 60 degrees, and shape is valleys and the flat peak.
|Trade Size||Threads per inch||Pitch||Major Diameter (O.D)|
|1 ¼||11 ½||0.08696||2.20878||1.660||42.16|
|1 ½||11 ½||0.08696||2.20878||1.900||48.26|
BSP threads are also known as British Standard Pipe Threads. BSP thread is commonly used in Australia and the countries which were affiliated with British in past. BSP thread is not base on the die of the pipe, but it is base on trade size. This can create some confusion sometimes.
Parallel BSP is known as BSPP and Tapered BSP is known is BSPT.
In BSP also all threads have the same pitch, 55-degree angle, its shape in round peaks and valley.
|Trade Size||Threads per inch||Pitch||Major Diameter||Minor Diameter||Gage Length|
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