What is NPT Thread?

NPT stands for National Pipe Thread and refers to a family of standard threaded pipe fittings mostly used in the United States. It is one of the most widely used thread types in the world and is commonly found in plumbing and industrial piping applications.

NPT threads is tapered thread, which means that the diameter of the thread decreases slightly along the length of the fitting. This taper creates a tight seal when the fitting is tightened into place, helping to prevent leaks. There are two main types of NPT threads: male and female. Male threads have external threads that screw into a female fitting, while female threads have internal threads that accept a male fitting.