How to measure pipe thread size with pictures
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If you buy a 1/2 inch thread and measure the diameter, it will measure over 1 inch because it's designed to have a nominal pipe fitting. The dimension in column 3 will be your nominal pipe thread size. 2.) second, use a thread pitch gauge to identify the number of threads per inch.
Use a ruler or tape measure to measure the inner diameter of the pipe.
Use a tape rule (or vernier gauge) to measure across the outside of the male thread. Using the table below we can see that a thread measuring 1/2 is actually a 1/4 bsp thread. Spread the ruler across the diameter of the pipe and measure. This number will help determine the thread dimension.
