Category Archives: Welcome to my Thread Talks

Welcome to my Thread Talk #2: IPS and NPS

Iron Pipe Size (IPS) is an old pipe sizing system that came was started in the early 19th century. It remained in effect until after WWII and was mainly used in the US and UK. When IPS was introduced, pipes were cast in halves and welded together. The sizing of IPS refers to the inside…

Welcome to my Thread Talks #1: NPT vs NPTF

National Pipe Taper (NPT) and National Pipe Taper Fuel (NPTF) are remarkably similar: both have the same taper and threads per inch, and the pitch diameter is the same. The difference is in the root and crest of the threads. NPT thread crest parameters encapsulate NPTF thread crests, even though the NPTF crests have a…