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Standard Drill Size

Standard Drill Sizes – Inches

Drill Size   Decimal Equiv.   Drill Size   Decimal Equiv.   Drill Size   Decimal Equiv.   Drill Size   Decimal Equiv.   Drill Size   Decimal Equiv.
80 = 0.0135   50 = 0.0700   22 = 0.1570   17/64 = 0.2656   1/2 = 0.5000
79 = 0.0145   49 = 0.0730   21 = 0.1590   H = 0.2660   33/64 = 0.5156
1/64 = 0.0156   48 = 0.0760   20 = 0.1610   I = 0.2720   17/32 = 0.5313
78 = 0.0160   5/64 = 0.0781   19 = 0.1660   J = 0.2770   35/64 = 0.5469
77 = 0.0180   47 = 0.0785   18 = 0.1695   K = 0.2810   9/16 = 0.5625
76 = 0.0200   46 = 0.0810   11/64 = 0.1719   9/32 = 0.2813   37/64 = 0.5781
75 = 0.0210   45 = 0.0820   17 = 0.1730   L = 0.2900   19/32 = 0.5938
74 = 0.0225   44 = 0.0860   16 = 0.1770   M = 0.2950   39/64 = 0.6094
73 = 0.0240   43 = 0.0890   15 = 0.1800   19/64 = 0.2969   5/8 = 0.6250
72 = 0.0250   42 = 0.0935   14 = 0.1820   N = 0.3020   41/64 = 0.6406
71 = 0.0260   3/32 = 0.0938   13 = 0.1850   5/16 = 0.3125   21/32 = 0.6563
70 = 0.0280   41 = 0.0960   3/16 = 0.1875   O = 0.3160   43/64 = 0.6719
69 = 0.0292   40 = 0.0980   12 = 0.1890   P = 0.3230   11/16 = 0.6875
68 = 0.0310   39 = 0.0995   11 = 0.1910   21/64 = 0.3281   45/64 = 0.7031
1/32 = 0.0313   38 = 0.1015   10 = 0.1935   Q = 0.3320   23/32 = 0.7188
67 = 0.0320   37 = 0.1040   9 = 0.1960   R = 0.3390   47/64 = 0.7344
66 = 0.0330   36 = 0.1065   8 = 0.1990   11/32 = 0.3438   3/4 = 0.7500
65 = 0.0350   7/64 = 0.1094   7 = 0.2010   S = 0.3480   49/64 = 0.7656
64 = 0.0360   35 = 0.1100   13/64 = 0.2031   T = 0.3580   25/32 = 0.7813
63 = 0.0370   34 = 0.1110   6 = 0.2040   23/64 = 0.3594   51/64 = 0.7969
62 = 0.0380   33 = 0.1130   5 = 0.2055   U = 0.3680   13/16 = 0.8125
61 = 0.0390   32 = 0.1160   4 = 0.2090   3/8 = 0.3750   53/64 = 0.8281
60 = 0.0400   31 = 0.1200   3 = 0.2130   V = 0.3770   27/32 = 0.8438
59 = 0.0410   1/8 = 0.1250   7/32 = 0.2188   W = 0.3860   55/64 = 0.8594
58 = 0.0420   30 = 0.1285   2 = 0.2210   25/64 = 0.3906   7/8 = 0.8750
57 = 0.0430   29 = 0.1360   1 = 0.2280   X = 0.3970   57/64 = 0.8906
56 = 0.0465   28 = 0.1405   A = 0.2340   Y = 0.4040   29/32 = 0.9063
3/64 = 0.0469   9/64 = 0.1406   15/64 = 0.2344   13/32 = 0.4063   59/64 = 0.9219
55 = 0.0520   27 = 0.1440   B = 0.2380   Z = 0.4130   15/16 = 0.9375
54 = 0.0550   26 = 0.1470   C = 0.2420   27/64 = 0.4219   61/64 = 0.9531
53 = 0.0595   25 = 0.1495   D = 0.2460   7/16 = 0.4375   31/32 = 0.9688
1/16 = 0.0625   24 = 0.1520   1/4 (E) = 0.2500   29/64 = 0.4531   63/64 = 0.9844
52 = 0.0635   23 = 0.1540   F = 0.2570   15/32 = 0.4688        
51 = 0.0670   5/32 = 0.1563   G = 0.2610   31/64 = 0.4844