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Tap & Drill Chart
  Clearance Hole Drills
Size of Screw   Tap Drill Close Fit Free Fit
No. or Dia. Decimal (inch) Threads Per Inch Drill Size Decimal (inch) Drill Size Decimal (inch) Drill Size Decimal (inch)
#0 0.06 80 3/64 0.0469 52 0.0635 50 0.07
#1 0.073 64 53 0.0595 48 0.076 46 0.081
#1 0.073 72 53 0.0595 48 0.076 46 0.081
#2 0.086 56 50 0.07 43 0.089 41 0.096
#2 0.086 64 50 0.07 43 0.089 41 0.096
#3 0.099 48 47 0.0785 37 0.104 35 0.11
#3 0.099 56 45 0.082 37 0.104 35 0.11
#4 0.112 36 44 0.086 32 0.116 30 0.1285
#4 0.112 40 43 0.089 32 0.116 30 0.1285
#4 0.112 48 42 0.0935 32 0.116 30 0.1285
#5 0.125 40 38 0.1015 30 0.1285 29 0.136
#5 0.125 44 37 0.104 30 0.1285 29 0.136
#6 0.138 32 36 0.1065 27 0.144 25 0.1495
#6 0.138 40 33 0.113 27 0.144 25 0.1495
#8 0.164 32 29 0.136 18 0.1695 16 0.177
#8 0.164 36 29 0.136 18 0.1695 16 0.177
#10 0.19 24 25 0.1495 9 0.196 7 0.201
#10 0.19 32 21 0.159 9 0.196 7 0.201
#12 0.216 24 16 0.177 2 0.221 I 0.228
#12 0.216 28 14 0.182 2 0.221 I 0.228
#14 0.242 20 10 0.1935 D 0.246 F 0.257
#14 0.242 24 7 0.201 D 0.246 F 0.257
1/4 0.25 20 7 0.201 F 0.257 H 0.266
1/4 0.25 28 3 0.213 F 0.257 H 0.266
5/16 0.3125 18 F 0.257 P 0.323 Q 0.332
5/16 0.3125 24 I 0.272 P 0.323 Q 0.332
3/8 0.375 16 5/16 0.3125 W 0.386 X 0.397
3/8 0.375 24 Q 0.332 W 0.386 X 0.397
7/16 0.4375 14 U 0.368 29/64 0.4531 15/32 0.4687
7/16 0.4375 20 25/64 0.3906 29/64 0.4531 15/32 0.4687
1/2 0.5 13 27/64 0.4219 33/64 0.5156 17/32 0.5312
1/2 0.5 20 29/64 0.4531 33/64 0.5156 17/32 0.5312
Tap Fractional Drill Bit Number Drill Bit Letter Drill Bit
0-80 3/64 - -
1-64 - 53 -
2-56 - 50 -
3-48 - 47 -
4-40 3/32 43 -
5-40 - 38 -
6-32 7/64 35 -
8-32 - 29 -
10-24 5/32 25 -
10-32 5/32 21 -
12-24 11/64 16 -
1/4-20 13/64 7 -
1/4-28 7/32 3 -
5/16-18 17/64 - F
5/16-24 - - I
3/8-16 5/16 - -
3/8-24 21/64 - Q
7/16-14 23/64 - U
7/16-20 25/64 - -
1/2-13 27/64 - -
1/2-20 29/64 - -
9/16-12 31/64 - -
9/16-18 33/64 - -
5/8-11 17/32 - -
5/8-18 37/64 - -
3/4-10 21/32 - -
3/4-16 11/16 - -
Drill sizes are for 75% depth of thread.

 

Standard Drill Sizes - Inches

Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
.
Drill
Size
.
Decimal
Equiv.
80 =

.0135

   43 = .089   8 = .199   25/64 = .3906
79 = .0145   42 = .0935   7 = .201   X = .397
1/64 = .0156   3/32 = .0938   13/64 = .2031   Y = .404
78 = .016   41 = .096   6 = .204   13/32 = .4063
77 = .018   40 = .098   5 = .2055   Z = .413
76 = .020   39 = .0995   4 = .209   27/64 = .4219
75 = .021   38 = .1015   3 = .213   7/16 = .4375
74 = .0225   37 = .104   7/32 = .2188   29/64 = .4531
73 = .024   36 = .1065   2 = .221   15/32 = .4688
72 = .025   7/64 = .1094   1 = .228   31/64 = .4844
71 = .026   35 = .110   A = .234   1/2 = .500
70 = .028   34 = .111   15/64 = .2344   33/64 = .5156
69 = .0292   33 = .113   B = .238   17/32 = .5313
68 = .031   32 = .116   C = .242   35/64 = .5469
1/32 = .0313   31 = .120   D = .246   9/16 = .5625
67 = .032   1/8 = .1250   1/4 (E) = .250   37/64 = .5781
66 = .033   30 = .1285   F = .257   19/32 = .5938
65 = .035   29 = .136   G = .261   39/64 = .6094
64 = .036   28 = .1405   17/64 = .2656   5/8 = .625
63 = .037   9/64 = .1406   H = .266   41/64 = .6406
62 = .038   27 = .144   I = .272   21/32 = .6563
61 = .039   26 = .147   J = .277   43/64 = .6719
60 = .040   25 = .1495   K = .281   11/16 = .6875
59 = .041   24 = .152   9/32 = .2813   45/64 = .7031
58 = .042   23 = .154   L = .290   23/32 = .7188
57 = .043   5/32 = .1563   M = .295   47/64 = .7344
56 = .0465   22 = .157   19/64 = .2969   3/4 = .750
3/64 = .0469   21 = .159   N = .302   49/64 = .7656
55 = .052   20 = .161   5/16 = .3125   25/32 = .7813
54 = .055   19 = .166   O = .316   51/64 = .7969
53 = .0595   18 = .1695   P = .323   13/16 = .8125
1/16 = .0625   11/64 = .1719   21/64 = .3281   53/64 = .8281
52 = .0635   17 = .173   Q = .332   27/32 = .8438
51 = .067   16 = .177   R = .339   55/64 = .8594
50 = .070   15 = .180   11/32 = .3438   7/8 = .875
49 = .073   14 = .182   S = .348   57/64 = .8906
48 = .076   13 = .185   T = .358   29/32 = .9063
5/64 = .0781   3/16 = .1875   23/64 = .3594   59/64 = .9219
47 = .0785   12 = .189   U = .368   15/16 = .9375
46 = .081   11 = .191   3/8 = .375   61/64 = .9531
45 = .082   10 = .1935   V = .377   31/32 = .9688
44 = .086   9 = .196  

W

 = .386   63/64 = .9844