Drill Charts

Number, Fraction or Letter Size Decimal Equivalent Tap Size
80 .0135
79 .0145
1/64 .0156
78 .0160
77 .0180
76 .0200
75 .0210
74 .0225
73 .0240
72 .0250
71 .0260
70 .0280
69 .0292
68 .0310
1/32 .0312
67 .0320
66 .0330
65 .0350
64 .0360
63 .0370
62 .0380
61 .0390
60 .0400
59 .0410
58 .0420
57 .0430
56 .0465
3/64 .0469 0-80
55 .0520
54 .0550
53 .0595 1-64, 72
1/16 .0625
52 .0635
51 .0670
50 .0700 2-56, 64
49 .0730
48 .0760
5/64 .0781
47 .0785 3-48
46 .0810
45 .0820 3-56
44 .0860
43 .0890 4-40
42 .0935 4-48
3/32 .0938
41 .0960
40 .0980
39 .0995
38 .1015 5-40
37 .1040 5-44
36 .1065 6-32
7/64 .1094
35 .1100
34 .1110
33 .1130 6-40
32 .1160
31 .1200
1/8 .1250
30 .1285
29 .1360 8-32, 36
28 .1405
9/64 .1406
27 .1440
26 .1470
25 .1495 10-24
24 .1520
23 .1540
5/32 .1562
22 .1570
21 .1590 10-32
20 .1610
19 .1660
18 .1695
11/64 .1719
17 .1730
16 .1770 12-24
15 .1800
14 .1820 12-28
13 .1850
3/16 .1875
12 .1890
11 .1910
10 .1935
9 .1960
8 .1990
7 .2010 1/4-20
13/64 .2031
6 .2040
5 .2055
4 .2090
3 .2130 1/4-28
7/32 .2188
2 .2210
1 .2280
A .2340
15/64 .2344
B .2380
C .2420
D .2460
1/4 - E .2500
F .2570 5/16-18
G .2610
17/64 .2656
H .2660
I .2720 5/16-24
J .2770
K .2810
9/32 .2812
L .2900
M .2950
19/64 .2969
N .3020
5/16 .3125 3/8-16
O .3160
P .3230
21/64 .3281
Q .3320 3/8-24
R .3390
11/32 .3438
S .3480
T .3580
23/64 .3594
U .3680 7/16-14
3/8 .3750
V .3770
W .3860
25/64 .3906 7/16-20
X .3970
Y .4040
Z .4130
27/64 .4219 1/2-13
7/16 .4375
29/64 .4531 1/2-20
15/32 .4688
31/64 .4844 9/16-12
1/2 .5000
33/64 .5156 9/16-18
17/32 .5312 5/8-11
35/64 .5469
9/16 .5625
37/64 .5781 5/8-18
19/32  
39/64  
5/8  
41/64  
21/32 .6562 3/4-10
43/64 .6719
11/16 .6875 3/4-16
45/64 .7031
23/32 .7188
47/64 .7344
3/4 .7500
49/64 .7656 7/8-9
25/32 .7812
51/64 .7969
13/16 .8125 7/8-14
53/64 .8281
27/32 .8438
55/64 .8594
7/8 .8750 1-8
57/64 .8906
29/32 .9062
59/64 .9219
15/16 .9375 1-14
61/64 .9531
31/32 .9688
63/64 .9844 1 1/8-7
1 1.0000
1 3/64 1.0469 1 1/8-12
1 7/64 1.1094 1 1/4-7
1 1/8 1.1250
1 11/64 1.1719 1 1/4-12
1 7/32 1.2188 1 3/8-6
1 1/4 1.2500
1 19/64 1.2969 1 3/8-12
1 11/32 1.3438 1 1/2-6
1 3/8 1.3750
1 27/64 1.4219 1 1/2-12
1 1/2 1.5000

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