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Thread Size (UNC) Major Diameter (inches) Minor Diameter (inches) Pitch Diameter (inches)
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#0-80 0.0600 0.0519 0.0559
#1-64 0.0730 0.0648 0.0689
#2-56 0.0860 0.0779 0.0820
#3-48 0.0990 0.0909 0.0949
#4-40 0.1120 0.1039 0.1079
#5-40 0.1250 0.1169 0.1209
#6-32 0.1380 0.1299 0.1339
#8-32 0.1640 0.1559 0.1599
#10-24 0.1900 0.1819 0.1859
#12-24 0.2160 0.2079 0.2119
1/4-20 0.2500 0.2419 0.2459
5/16-18 0.3125 0.3044 0.3084
3/8-16 0.3750 0.3669 0.3709
7/16-14 0.4375 0.4294 0.4334
1/2-13 0.5000 0.4919 0.4959
9/16-12 0.5625 0.5544 0.5584
5/8-11 0.6250 0.6169 0.6209
3/4-10 0.7500 0.7419 0.7459
7/8-9 0.8750 0.8669 0.8709
1-8 1.0000 0.9919 0.9959