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Pipe Thread Male Thread O.D. Female Thread I.D. | JIC or O-Ring Thread Male Thread O.D. Female Thread I.D. | Flat Face O-Ring Thread size Male Thread O.D. Female Thread I.D.
-2 1/8-27 0.41 0.38 | -2 5/16-24 .312 .270 | -2


-3


| -3 3/8-24 .375 .335 | -3


-4 1/4-18 0.54 0.49 | -4 7/16-20 .437 .390 | -4 9/16-18 .562 .510
-5


| -5 1/2-20 .500 .450 | -5


-6 3/8-18 0.68 0.63 | -6 9/16-18 .562 .505 | -6 11/16-16 .687 .630
-8 1/2-14 0.84 0.77 | -8 3/4-16 .750 .690 | -8 13/16-16 .812 .750
-10


| -10 7/8-14 .875 .805 | -10 1-14 1.000 .930
-12 3/4-11 ½ 1.05 0.98 | -12 1 1/16-12 1.062 .980 | -12 1 3/16-12 1.190 1.110
-14


| -14 1 3/16-12 1.187 1.100 | -14


-16 1-11 ½ 1.32 1.24 | -16 1 5/16-12 1.312 1.230 | -16 1 7/16-12 1.437 1.360
-20 1 1/4-11 ½ 1.66 1.58 | -20 1 5/8-12 1.625 1.540 | -20 1 11/16-12 1.687 1.610
-24 1 1/2-11 ½ 1.9 1.82 | -24 1 7/8-12 1.875 1.790 | -24 2-12 2.000 1.920
-32 2-11 1/2 2.38 2.3 | -32 2-1/2-12 2.500 2.420 | -32