How to measure thread size plumbing with different way
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Shop all fittings how to measure pipe fittings measuring thread size may also be confusing. Using a vernier caliper, measure the o.d. For example a 1/2 bsp thread (see above) actually measures more like 3/4 with a ruler.
For pvc pipe measure the outer diameter, for the fittings measure the inner diameter.
The dimension in column 3 will be your nominal pipe thread size. Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference) divide the circumference by 3.14159; Wrap a string around the pipe; Subtract 1/4 inch (0.25) from the od measurement.