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For male thread measure the outside diameter of the largest portion of the thread (A). Find the actually inch size closest to what you get for A on the chart belowand then to the right of thatyou will see the pipe size.
For female thread measure the top of thread at B. Find the actual size closest to the measurement that you get for B and then to the right of that you will see the pipe size.
| Actual size in Inches |
Pipe Thread Size |
| 0.540 |
1/4 |
| 0.675 |
3/8 |
| 0.840 |
1/2 |
| 1.050 |
3/4 |
| 1.315 |
1 |
| 1.660 |
1-1/4 |
| 1.900 |
1-1/2 |
| 2.375 |
2 |
| 2.875 |
2-1/2 |
| 3.5 |
3 |
| 4.5 |
4 |
Title: How do I measure male and female threads?
Description: Brief description oF measuring internal and external threads.
Published: 7/9/2003
Last Edited: 12/28/2022
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