Nov 19, 2025
NPT stands for National Pipe Taper, known in Chinese as the "American National Tapered Pipe Thread." The threads of this type of fitting are tapered, resembling a pin, with the diameter gradually increasing from one end to the other. It creates a seal through the taper of the threads and requires the use of Teflon tape or pipe thread sealant to achieve an effective seal. This NPT fitting is widely used in various fluid (water, gas, oil) pipeline systems across North America.
Measuring NPT fittings primarily involves determining their nominal diameter rather than directly measuring the physical diameter of the threads. Here are the simple measurement steps:
Measure the outer diameter: For male threads, use calipers to measure the major diameter of the threads.
Refer to a size chart: Compare the measured outer diameter with a standard NPT size reference chart to identify the corresponding nominal diameter.
A quick estimation reference:
The major diameter of a 1/8-inch NPT male thread is approximately 10.3 mm.
The major diameter of a 1/4-inch NPT male thread is approximately 13.7 mm.
The major diameter of a 1/2-inch NPT male thread is approximately 21.0 mm.
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