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TAP AND DRILL CHARTS
       
 
Wire Tap & Drill Chart
         
Tap size Drill Size Drill in Decimal % of Thread MM
0 - 80 # 56 .0465 73 1.18
  3 / 64" .0469 71 1.19
1 - 64 # 54 .0550 80 1.40
  # 53 .0595 59 1.51
1 - 72 # 53 .0595 67 1.51
  1 / 16" .0265 50 1.59
2 - 56 # 51 .0670 73 1.70
  # 50 .0700 62 1.78
2 - 64 # 50 .0700 70 1.78
  # 49 .0730 56 1.85
3 - 46 # 48 .0760 77 1.93
  5 / 64" .0781 70 1.98
3 - 56 # 46 .0810 69 2.06
  # 45 .0820 65 2.08
4 - 40 # 44 .0860 73 2.18
  # 43 .0890 65 2.26
4 - 48 # 42 .0935 61 2.37
  3 / 32" .0938 60 2.38
5 - 40 # 40 .0980 75 2.50
  # 38 .1015 65 2.58
5 - 44 # 38 .1015 71 2.58
  # 37 .1040 63 2.64
6 - 32 # 37 .1040 77 2.64
  7 / 64" .1094 64 2.78
6 - 40 # 34 .1110 69 2.82
  # 33 .1130 69 2.87
8 - 32 # 29 .1360 62 3.45
  # 28 .1405 51 3.57
8 - 36 # 29 1360 70 3.45
  9 / 64" .1406 57 3.57
10 - 24 # 27 .1440 78 3.66
  # 25 .1495 69 3.80
10 -32 5 / 32" .1563 74 3.97
  # 21 .1590 68 4.04
12 - 24 11 / 64" .1719 74 4.37
  # 17 .1730 73 4.39
12 - 28 # 16 .1770 76 4.50
  # 15 .1800 70 4.57
Tap size Drill Size Drill in Decimal % of Thread MM
 
Fractional Tap & Drill Chart
         
Tap size Drill Size Drill in Decimal % of Thread MM
1/4 - 20 # 7 .2010 70 5.11
  13 / 64" .2031 66 5.16
1/4 -28 # 3 .2130 72 5.41
  7 / 32" .2188 59 5.56
5/16 -18 F .2570 71 6.35
     7 / 32" .2188 59 5.56
5/16 - 24 H .2660 77 6.76
  I .2720 67 6.91
3/8 - 16 5 / 16" .3281 71 7.94
  0 .3106 68 8.03
3/8 - 24 21 / 64" .3281 78 8.33
  Q .3320 71 8.43
7/16 - 14 T .3580 80 9.09
  23 / 64" .3594 79 9.13
7/16 - 20 W .3860 71 9.80
  25 / 64" .3906 65 9.92
1/2 - 13 27 / 64" .4219 72 10.72
  7 /16" .4375 58 11.11
1/2 - 20 29 / 64" .4231 65 11.51
9/16 - 12 15 / 32" .4844 80 11.91
  31 / 64" .4844 68 12.30
9/16 - 18 1 / 2" .5000 78 12.70
  33 / 64" .5156 58 13.10
5/8 - 11 17/32" .5321 75 13.49
5/8 - 18 37/64" .5781 58 14.68
3/4 - 10 21/32" 16.67 68 16.67
3/4 - 16 11/16" .6875 71 14.46
7/8 - 9 49/64" .7656 72 19.45
7/8 - 14 13/16" .8125 62 20.64
1" - 8 7/8" .8750 73 22.23
1" - 12 59/64" .9219 67 23.42
1" - 14 15/16" .9375 61 23.81
1 1/8 - 7 63/64" .9844 72 25
1 1/8 - 12 1-3/64"   65  
1 1/4 - 7 1-7/64"   75  
1 1/4 - 12 1-11/64"   72  
1 1/2 - 6 1-11/32"   72  
         
Tap size Drill Size Drill in Decimal % of Thread MM
       
       
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