NPT gauges are manufactured according to the B1.20.1 standards.
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.
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.
For over a period of 11 years, engaged in Trading and Manufacturing of quality Thread Gauges in India.
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