To gage Internal N.P.T. taper pipe threads, screw the N.P.T. thread plug firmly into the product – do not force. The thread is within the permissible tolerance when the gaging notch of the plug is not more than one turn plus or minus from being flush with the end of the product. N.P.T. plugs are regularly furnished wit
Technical Resources - BSP Thread Sizes, NPT Thread Sizes
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