NPT gauges are manufactured according to the B1.20.1 standards.

With basic step taper threads ring gauge

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With basic step taper threads plug gauge

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External Threads : As shown in the figure, when screwed into the component threads by hand, the Basic Step gauge should be flush with the end of the component face within single turn.

With min/max step taper threads ring gauge

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With min/max step taper threads plain gauge

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Internal Threads : As shown in the figure, when using a Min/Max Step type gauge, the component face end should be flush between the Minimum and Maximum step limits.

THREAD GAUGE PROFILE




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