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Thread Size (UNF) Major Diameter (inches) Minor Diameter (inches) Pitch Diameter (inches)
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#0-80 0.0600 0.0537 0.0576
#1-72 0.0730 0.0667 0.0706
#2-64 0.0860 0.0797 0.0836
#3-56 0.0990 0.0927 0.0966
#4-48 0.1120 0.1057 0.1096
#5-44 0.1250 0.1187 0.1226
#6-40 0.1380 0.1317 0.1356
#8-36 0.1640 0.1577 0.1616
#10-32 0.1900 0.1837 0.1876
#12-28 0.2160 0.2097 0.2136
1/4-28 0.2500 0.2437 0.2476
5/16-24 0.3125 0.3062 0.3101
3/8-24 0.3750 0.3687 0.3726
7/16-20 0.4375 0.4312 0.4351
1/2-20 0.5000 0.4937 0.4976
9/16-18 0.5625 0.5562 0.5601
5/8-18 0.6250 0.6187 0.6226
3/4-16 0.7500 0.7437 0.7476
7/8-14 0.8750 0.8687 0.8726
1-12 1.0000 0.9937 0.9976