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ANSI (Imperial) and ISO Metric Drill Sizes
The first column gives the ANSI Number or Letter drill size and the second column gives the exact size in inches. The third column gives the closest available ISO Metric drill size (or fractional inch size) and finally the fourth column then gives the exact size in inches of this drill.
Example
#31 - The exact size is 0.1200 inches.
The closest ISO size is 3.00mm or 0.1181 inches.
Number or Letter Size Diameter (Inches) Nearest Approved Size Diameter (Inches)
80 0.0135 0.35mm 0.0138
79 0.0145 0.38mm 0.0150
78 0.0160 0.40mm 0.0157
77 0.0180 0.45mm 0.0177
76 0.0200 0.50mm 0.0197
75 0.0210 0.52mm 0.0205
74 0.0225 0.58mm 0.0228
73 0.0240 0.60mm 0.0236
72 0.0250 0.65mm 0.0256
71 0.0260 0.65mm 0.0256
70 0.0280 0.70mm 0.0276
69 0.0292 0.75mm 0.0295
68 0.0310 1/32" 0.3120
67 0.0320 0.82mm 0.0323
66 0.0330 0.85mm 0.0335
65 0.0350 0.90mm 0.0354
64 0.0360 0.92mm 0.0362
63 0.0370 0.95mm 0.0374
62 0.0380 0.98mm 0.0386
61 0.0390 1.00mm 0.0394
60 0.0400 1.00mm 0.0394
59 0.0410 1.05mm 0.0413
58 0.0420 1.05mm 0.0413
57 0.0430 1.10mm 0.0433
56 0.0465 3/64" 0.0469
55 0.0520 1.30mm 0.0512
54 0.0550 1.40mm 0.0551
53 0.0595 1.50mm 0.0591
52 0.0635 1.60mm 0.0630
51 0.0670 1.70mm 0.0669
50 0.0700 1.80mm 0.0709
49 0.0730 1.85mm 0.0728
48 0.0760 1.95mm 0.0768
47 0.0785 2.00mm 0.0787
46 0.0810 2.05mm 0.0807
45 0.0820 2.10mm 0.0827
44 0.0860 2.20mm 0.0866
43 0.0890 2.25mm 0.0886
42 0.0935 3/32" 0.0938
41 0.0960 2.45mm 0.0965
40 0.0980 2.50mm 0.0984
39 0.0995 2.55mm 0.1004
38 0.1015 2.60mm 0.1024
37 0.1040 2.65mm 0.1043
36 0.1065 2.70mm 0.1063
35 0.1100 2.80mm 0.1102
34 0.1110 2.80mm 0.1102
33 0.1130 2.85mm 0.1122
32 0.1160 2.95mm 0.1161
31 0.1200 3.00mm 0.1181
30 0.1285 3.30mm 0.1299
29 0.1360 3.50mm 0.1378
28 0.1405 9/64" 0.1406
27 0.1440 3.70mm 0.1457
26 0.1470 3.70mm 0.1457
25 0.1495 3.80mm 0.1496
24 0.1520 3.90mm 0.1535
23 0.1540 3.90mm 0.1535
22 0.1570 4.00mm 0.1575
21 0.1590 4.10mm 0.1614
20 0.1610 4.10mm 0.1614
19 0.1660 4.20mm 0.1654
18 0.1695 4.30mm 0.1693
17 0.1730 4.40mm 0.1732
16 0.1770 4.50mm 0.1772
15 0.1800 4.60mm 0.1811
14 0.1820 4.60mm 0.1811
13 0.1850 4.70mm 0.1850
12 0.1890 4.80mm 0.1890
11 0.1910 4.90mm 0.1929
10 0.1935 4.90mm 0.1929
9 0.1960 5.00mm 0.1969
8 0.1990 5.10mm 0.2008
7 0.2010 5.10mm 0.2008
6 0.2040 5.20mm 0.2047
5 0.2055 5.20mm 0.2047
4 0.2090 5.30mm 0.2087
3 0.2130 5.40mm 0.2126
2 0.2210 5.60mm 0.2205
1 0.2280 5.80mm 0.2283
A 0.2340 15/64" 0.2344
B 0.2380 6.00mm 0.2362
C 0.2420 6.10mm 0.2402
D 0.2460 6.20mm 0.2441
E 0.2500 1/4" 0.2500
F 0.2570 6.50mm 0.2559
G 0.2610 6.60mm 0.2598
H 0.2660 17/64" 0.2656
I 0.2720 6.90mm 0.2717
J 0.2770 7.00mm 0.2756
K 0.2810 9/32" 0.2812
L 0.2900 7.40mm 0.2913
M 0.2950 7.50mm 0.2953
N 0.3020 7.70mm 0.3031
O 0.3160 8.00mm 0.3150
P 0.3230 8.20mm 0.3228
Q 0.3320 8.40mm 0.3307
R 0.3390 8.60mm 0.3386
S 0.3480 8.80mm 0.3465
T 0.3580 9.10mm 0.3583
U 0.3680 9.30mm 0.3661
V 0.3770 3/8" 0.3750
W 0.3860 9.80mm 0.3858
X 0.3970 10.10mm 0.3976
Y 0.4040 10.30mm 0.4055
Z 0.4130 10.50mm 0.4134