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What are the differences between BSP and NPT threading?

BSP (British Standard Pipe) and NPT (National Pipe Thread) are two different threading standards used for pipe and fitting connections. They originate from different regions and have distinct characteristics. Here’s a comparison between BSP and NPT threading:

BSP (British Standard Pipe) Thread

Origin

The BSP thread standard originates from the United Kingdom and is commonly used in European countries and other regions influenced by British standards.
Thread Angle: BSP threads have a 55-degree thread angle. This means that each thread is inclined at 55 degrees to the center axis of the pipe.

Thread Design

BSP threads come in two main variants: BSPP (British Standard Pipe Parallel) and BSPT (British Standard Pipe Tapered). BSPP threads have a parallel design, while BSPT threads are tapered.

Sealing Mechanism

BSPP threads rely on a gasket or seal to provide a leak-resistant connection. BSPT threads use the taper to create a tight seal without requiring a gasket.

Applications

BSP threads are commonly used in water supply, plumbing, and industrial applications in countries that adopt British standards.

NPT (National Pipe Thread) Thread

Origin

The NPT thread standard originates from the United States and is widely used in North America and some other regions.

Thread Angle

NPT threads have a 60-degree thread angle. This means that each thread is inclined at 60 degrees to the center axis of the pipe.

Thread Design

NPT threads are tapered, meaning that they become narrower as they move towards the end of the pipe. This taper assists in creating a seal.

Sealing Mechanism

NPT threads rely on the thread taper and the use of pipe sealant (thread sealant or Teflon tape) to create a seal and prevent leakage.

Applications

NPT threads are commonly used in a wide range of applications, including plumbing, industrial processes, and fluid transport in regions that follow American standards.

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