What is the difference between NPT and NPS thread?

  • NPS = National Pipe Straight
  • NPT = National Pipe Thread

Both NPT and NPS have the same thread angle, shape, and pitch (threads per inch).  However, NPT threads are tapered and NPS threads are straight (parallel).  Both threads have a 60° included angle and have flat peaks and valleys.

Tapered Pipe Thread is commonly found on ends of pipe, nipples and fittings (i.e. couplings, elbows, tees, etc.). Note: Sharply angled threads are very critical to joint being tight with no leaks. Thread sealant or tape is typically required to complete the seal.

Straight Pipe Threads need a gasket or O-ring to create a seal.

While NPT and NPS threads will engage, they do not seal properly with each other.

Article Title:
What is the difference between NPT and NPS thread?
Article Summary:
NPT vs. NPS
Article Date:
3/13/2015
Article ID:
998
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