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

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Last Updated on: 05/01/2003