How to measure pipe thread size with manual
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Many people like using pi tapes to measure the pipe size. To find out what size threaded fitting you have, measure the outer diameter of male threads and inner diameter of female fittings. Measure top diameter of thread at b;
In the chart below you can find the physical measurements of the thread size (col 1 and col 2 are the same dimension) and cross reference it with the pipe thread size in col 3.
The dimension in column 3 will be your nominal pipe thread size. Using the table below we can see that a thread measuring 1/2 is actually a 1/4 bsp thread. Measure circumference using a flexible tape and divide the outside circumference by 3.1415. To find out what size threaded fitting you have, measure the outer diameter of male threads and inner diameter of female fittings.
