NominalDiam Pitch Minordiam G 7.723 0.907 6.561 G1/16 9.728 0.907 8.566 G1/8 13.157 1.337 11.445 G1/4 16.662 1.337 14.950 G3/8 20.955 1.814 18.631 G1/2 22.911 1.814 20.587 G5/8 26.441 1.814 24.117 G3/4 30.201 1.814 27.877 G7/8 33.249 2.309 30.291 G1 37.897 2.309 34.939 G1 1/8 41.910 2.309 38.952 G1 1/4 44.323 2.309 41.365 G1 3/8 47.803 2.309 44.845 G1 1/2 53.746 2.309 50.788 G1 3/4 59.614 2.309 56.656 G2