TAP Tap Drill Decimal Drill Size Theo. % of Thread Prob. Over size Prob. Hole Size % of Thread
#0-80 56 .0465 83% .0015 .0480 74%
  3/64 .0469 81% .0015 .0480 71%
#1-64 54 .0550 89% .0015 .0565 81%
  53 .0595 67% .0015 .0610 59%
#1-72 53 .0595 75% .0015 .0610 67%
  1/16 .0625 58% .0015 .0640 50%
#2-56 51 .0670 82% .0017 .0687 74%
  50 .0700 69% .0017 .0717 62%
  49 .0730 56% .0017 .0747 49%
#2-64 50 .0700 79% .0017 .0717 70%
  49 .0730 64% .0017 .0747 56%
#3-48 48 .0760 85% .0019 .0779 78%
  5/64 .0781 77% .0019 .0800 70%
  47 .0785 76% .0019 .0804 69%
  46 .0810 67% .0019 .0829 60%
  45 .0820 63% .0019 .0839 56%
#3-56 46 .0810 78% .0019 .0829 69%
  45 .0820 73% .0019 .0839 65%
  44 .0860 56% .0020 .0880 47%
#4-40 44 .0860 80% .0020 .0880 74%
  43 .0890 71% .0020 .0910 65%
  42 .0935 57% .0020 .0955 51%
  3/32 .0938 56% .0020 .0958 50%
#4-48 42 .0935 68% .0020 .0955 61%
  3/32 .0938 68% .0020 .0958 60%
  41 .0960 59% .0020 .0980 52%
#5-40 40 .0980 83% .0023 .1003 76%
  39 .0995 79% .0023 .1018 71%
  38 .1015 72% .0023 .1038 65%
  37 .1040 65% .0023 .1063 58%
#5-44 38 .1015 79% .0023 .1038 72%
  37 .1040 71% .0023 .1063 63%
  36 .1065 63% .0023 .1088 55%
#6-32 37 .1040 84% .0023 .1063 78%
  36 .1065 78% .0023 .1088 72%
  7-64 .1094 70% .0026 .1120 64%
  35 .1100 69% .0026 .1126 63%
  34 .1110 67% .0026 .1136 60%
  33 .1130 62% .0026 .1156 55%
#6-40 34 .1110 83% .0026 .1136 75%
  33 .1130 77% .0026 .1156 69%
  32 .1160 68% .0026 .1186 60%
#8-32 29 .1360 69% .0029 .1389 62%
  28 .1405 58% .0029 .1434 51%
#8-36 29 .1360 78% .0029 .1389 70%
  28 .1405 68% .0029 .1434 57%
  9-64 .1406 68% .0029 .1435 57%
#10-24 27 .1440 85% .0032 .1472 79%
  26 .1470 79% .0032 .1502 74%
  25 .1495 75% .0032 .1527 69%
  24 .1520 70% .0032 .1552 64%
  23 .1540 67% .0032 .1572 61%
#10-32 5/32 .1563 83% .0032 .1595 75%
  22 .1570 81% .0032 .1602 73%
  21 .1590 76% .0032 .1622 68%
  20 .1610 71% .0032 .1642 64%
  19 .1660 59% .0032 .1692 51%
#12-24 11/64 .1719 82% .0035 .1754 75%
  17 .1730 79% .0035 .1765 73%
  16 .1770 72% .0035 .1805 66%
  15 .1800 67% .0035 .1835 60%
  14 .1820 63% .0035 .1855 56%
#12-28 16 .1770 84% .0035 .1805 77%
  15 .1800 78% .0035 .1835 70%
  14 .1820 73% .0035 .1855 66%
  13 .1850 67% .0035 .1885 59%
  3/16 .1875 61% .0035 .1910 54%
1/4-20 9 .1960 83% .0038 .1998 77%
  8 .1990 79% .0038 .2028 73%
  7 .2010 75% .0038 .2048 70%
  13/64 .2031 72% .0038 .2069 66%
  6 .2040 71% .0038 .2078 65%
  5 .2055 69% .0038 .2093 63%
  4 .2090 63% .0038 .2128 57%
1/4-28 3 .2130 80% .0038 .2168 72%
  7/32 .2188 67% .0038 .2226 59%
  2 .2210 63% .0038 .2248 55%
5/16-18 F .2570 77% .0038 .2608 72%
  G .2610 71% .0041 .2651 66%
  17/64 .2656 65% .0041 .2697 59%
  H .2660 64% .0041 .2701 59%
5/16-24 H .2660 86% .0041 .2701 78%
  I .2720 75% .0041 .2761 67%
  J .2770 66% .0041 .2811 58%
3/8-16 5/16 .3125 77% .0044 .3169 72%
  O .3160 73% .0044 .3204 68%
  P .323 64% .0044 .3274 59%
3/8-24 21/64 .3281 87% .0044 .3325 79%
  Q .3320 79% .0044 .3364 71%
  R .3390 67% .0044 .3434 58%
7/16-14 T .3580 86% .0046 .3626 81%
  23/64 .3594 84% .0046 .3640 79%
  U .3680 75% .0046 .3726 70%
  3/8 .3750 67% .0046 .3796 62%
  V .3770 65% .0046 .3816 60%
7/16-20 W .3860 79% .0046 .3906 72%
  25/64 .3906 72% .0046 .3952 65%
  X .3970 62% .0046 .4016 55%
1/2-13 27/64 .4219 78% .0047 .4266 73%
  7/16 .4375 63% .0047 .4422 58%
1/2-20 29/64 .4531 72% .0047 .4578 65%
9/16-12 15/32 .4688 87% .0048 .4736 82%
  31/64 .4844 72% .0048 .4892 68%
9/16-18 1/2 .500 87% .0048 .5048 80%
  33/64 .5156 65% .0048 .5204 58%
5/8-11 17/32 .5313 79% .0049 .5362 75%
  35/64 .5469 66% .0049 .5518 62%
5/8-18 9/16 .5625 87% .0049 .5674 80%
  37/64 .5781 65% .0049 .5831 58%
3/4-10 41/64 .6406 84% .0050 .6456 80%
  21/32 .6563 72% .0050 .6613 68%
3/4-16 11/16 .6875 77% .0050 .6925 71%
7/8-9 49/64 .7656 76% .0052 .7708 72%
  25/32 .7812 65% .0052 .7864 61%
7/8-14 51/64 .7969 84% .0052 .8021 79%
  13/16 .8125 67% .0052 .8177 62%
1-8 55/64 .8594 87% .0059 .8653 83%
  7/8 .875 77% .0059 .8809 73%
  57/64 .8906 67% .0059 .8965 64%
  29/32 .9063 58% .0059 .9122 54%
1-12 29/32 .9063 87% .0059 .9122 81%
  59/64 .9219 72% .0060 .9279 67%
  15/16 .9375 58% .0060 .9435 52%
1-14 59-64 .9219 84% .0060 .9279 78%
  15/16 .9375 67% .0060 .9435 61%
1 1/8-7 31/32 .9688 84% .0062 .9750 81%
  63/64 .9844 76% .0067 .9911 72%
  1 1.000 67% .0070 1.007 64%
  1 1/64 1.0156 59% .0070 1.0226 55%
1 1/8-12 1 1/32 1.0313 87% .0071 1.0384 80%
  1 3/64 1.0469 72% .0072 1.0541 66%
1 1/4-7 1 3/32 1.0938 84% REAM    
  1 7/64 1.1094 76% REAM    
  1 1/8 1.125 67% REAM    
1 1/4-12 1 5/32 1.1563 87% REAM    
  1 11/64 1.1719 72% REAM    
1 3/8-6 1 3/16 1.1875 87% REAM    
  1 13/64 1.2031 79% REAM    
  1 7/32 1.2188 72% REAM    
  1 15/64 1.2344 65% REAM    
1 3/8-12 1 9/32 1.2813 87% REAM    
  1 19/64 1.2969 72% REAM    
1 1/2-6 1 5/16 1.3125 87% REAM    
  1 21/64 1.3281 79% REAM    
  1 11/32 1.3438 72% REAM    
  1 23/64 1.3594 65% REAM    
1 1/2-12 1 13/32 1.4063 87% REAM    
  1 27/64 1.4219 72% REAM