NPT fitting sizes can often cause confusion, as they don’t match the actual physical dimensions of the fitting. Instead, NPT sizes correspond to the nominal pipe size (NPS), which relates to the inside diameter of the pipe that the fitting connects to, not the outer dimensions of the fitting itself. For example, a 1/2” NPT fitting does not have an outer diameter of 1/2”, but rather, it fits into a pipe with a nominal diameter of 1/2”.
The most common NPT sizes range from 1/8” to 2” for smaller-scale applications, although larger sizes are available for industrial use.
Key Points for Measuring NPT Sizes:
Npt pipe fitting sizes: The NPT size is based on the pipe’s inside diameter, not the fitting’s external dimensions.
Tapered Threads: The threads are tapered to provide a tight seal, and measurements should take this into account.
Thread Pitch: The number of threads per inch must be measured to ensure the proper fit. NPT thread pitch varies based on size.
Outside Diameter (OD): The actual outside diameter of the fitting is larger than the NPT size, which can be confusing for those unfamiliar with these measurements.
Post time: Dec-10-2024