Understanding NPT, NPTF & NPS Thread Connections
https://www.buyfittingsonline.com/pages/npt-vs-nps-vs-nptf-thread-connections-the-difference.html
WebFeb 1, 2024 · NPS = National Pipe Straight. NPT = National Pipe Thread. NPTF = National Pipe Thread Fuel. 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.
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