How to measure thread size with caliper with smart ways
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How to measure threads 1.) first, use a combination o.d./i.d. In general smaller fasteners have finer thread so they have lower thread pitch. Use a caliper, measuring tape, or ruler to measure the thread diameter of a male thread or female thread.
For example, a 1” mpt pipe thread has an outside diameter of 1.315” npt size thread diameter od of mpt (id of fpt will be slightly less than this.) 1/8” 0.405” 1/4” 0.
For metric connections, measure the distance between threads. Caliper to measure the thread diameter. Measure the male thread with the bolt gauge or digital caliper. In general smaller fasteners have finer thread so they have lower thread pitch.
