1 2 npt threadsize chart

NPT Size  Tap Drill Size (in.) (Decimal) (in.) 1/16 - 27 "C" (0.242) 1/8 - 27 "Q"  (0.332) 1/4 - 18 7/16 (0.438) 3/8 - 18 9/16 (0.562) 1/2 - 14 45/64 (0.703) 3/4 - 14 29/32 (0.906) 1.0 - 11•1/2 1•9/64 (1.141) 1•1/4 - 11•1/2 1•31/64 (1.484) 1•1/2 - 11•1/2 1•23/32 (1.719) 2.0 - 11•1/2 2•3/16 (2.188) 2•1/2 - 8 2•39/64 (2.609) 3.0 - 8 3•15/64 (3.234)

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1 2 npt threadsizes

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