How To Measure Pipe Thread Size. How to measure pipe fittings. Secondly, how far does a pipe thread into a fitting?
Measure the inner diameter (id) of the female thread and the outer diameter (od) of the male thread. Wrap a string around the pipe; Use a ruler or tape measure to measure the inner diameter of the pipe.
So, what is pipe thread basically?
For metric connections, measure the distance between threads. It could be either a male or, a female thread. Find figure nearest this dimension in column 1 or 2 of chart. Caliper to measure the thread diameter.