Consult the “Step 2” column in Table 1 for possible pitches.Ĭombining the results of Steps 1 and 2 will determine – or help predict, in some cases – the correct procedure for Step 3. The result from Step 2 will narrow down the possible thread forms even more because most have a distinct pitch. Because some thread pitches are relatively similar, it is advisable to try a number of gages before deciding which one fits best. It is much easier to compare threads against a lighted background with a pitch gage. This can be deciphered using a pitch gage for comparison or by accurately measuring and calculating the number of pipe threads within a given distance. If this is not obvious by looking at the fitting, use the parallel jaws of a caliper to make a comparison. Tapered threads get smaller in diameter toward the end of the fitting while parallel threads maintain the same diameter from start to finish. In some cases, Step 1 can be accomplished by visual inspection alone. Metric Tapered and Metric Parallel speak for themselves. NPT/NPTF and BSPT are tapered threads while UN/UNF and BSPP are parallel. Step 1 – Determine if the stainless steel pipe thread is tapered or parallel.
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