Drill Bit Sizes - Drill Bit Conversion Table

Drill Bit Conversion Table

See also: drill and tap size chart
gauge in/mm
80 0.0135 in/0.343 mm
79 0.0145 in/0.368 mm
78 0.016 in/0.406 mm
77 0.018 in/0.457 mm
76 0.020 in/0.508 mm
75 0.021 in/0.533 mm
74 0.0225 in/0.572 mm
73 0.024 in/0.610 mm
72 0.025 in/0.635 mm
71 0.026 in/0.660 mm
70 0.028 in/0.711 mm
69 0.0292 in/0.742 mm
68 0.031 in/0.787 mm
67 0.032 in/0.813 mm
66 0.033 in/0.838 mm
65 0.035 in/0.889 mm
64 0.036 in/0.914 mm
63 0.037 in/0.940 mm
62 0.038 in/0.965 mm
61 0.039 in/0.991 mm
60 0.040 in/1.016 mm
59 0.041 in/1.041 mm
58 0.042 in/1.067 mm
57 0.043 in/1.092 mm
56 0.0465 in/1.181 mm
55 0.052 in/1.321 mm
54 0.055 in/1.397 mm
gauge in/mm
53 0.0595 in/1.511 mm
52 0.0635 in/1.613 mm
51 0.067 in/1.702 mm
50 0.070 in/1.778 mm
49 0.073 in/1.854 mm
48 0.076 in/1.930 mm
47 0.0785 in/1.994 mm
46 0.081 in/2.057 mm
45 0.082 in/2.083 mm
44 0.086 in/2.184 mm
43 0.089 in/2.261 mm
42 0.0935 in/2.375 mm
41 0.096 in/2.438 mm
40 0.098 in/2.489 mm
39 0.0995 in/2.527 mm
38 0.1015 in/2.578 mm
37 0.104 in/2.642 mm
36 0.1065 in/2.705 mm
35 0.110 in/2.794 mm
34 0.111 in/2.819 mm
33 0.113 in/2.870 mm
32 0.116 in/2.946 mm
31 0.120 in/3.048 mm
30 0.1285 in/3.264 mm
29 0.136 in/3.454 mm
28 0.1405 in/3.569 mm
27 0.144 in/3.658 mm
gauge in/mm
26 0.147 in/3.734 mm
25 0.1495 in/3.797 mm
24 0.152 in/3.861 mm
23 0.154 in/3.912 mm
22 0.157 in/3.988 mm
21 0.159 in/4.039 mm
20 0.161 in/4.089 mm
19 0.166 in/4.216 mm
18 0.1695 in/4.305 mm
17 0.173 in/4.394 mm
16 0.177 in/4.496 mm
15 0.180 in/4.572 mm
14 0.182 in/4.623 mm
13 0.185 in/4.699 mm
12 0.189 in/4.801 mm
11 0.191 in/4.851 mm
10 0.1935 in/4.915 mm
9 0.196 in/4.978 mm
8 0.199 in/5.055 mm
7 0.201 in/5.105 mm
6 0.204 in/5.182 mm
5 0.2055 in/5.220 mm
4 0.209 in/5.309 mm
3 0.213 in/5.410 mm
2 0.221 in/5.613 mm
1 0.228 in/5.791 mm
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gauge in/mm
A 0.234 in/5.944 mm
B 0.238 in/6.045 mm
C 0.242 in/6.147 mm
D 0.246 in/6.248 mm
E 0.250 in/6.350 mm
F 0.257 in/6.528 mm
G 0.261 in/6.629 mm
H 0.266 in/6.756 mm
I 0.272 in/6.909 mm
J 0.277 in/7.036 mm
K 0.281 in/7.137 mm
L 0.290 in/7.366 mm
M 0.295 in/7.493 mm
N 0.302 in/7.671 mm
O 0.316 in/8.026 mm
P 0.323 in/8.204 mm
Q 0.332 in/8.433 mm
R 0.339 in/8.611 mm
S 0.348 in/8.839 mm
T 0.358 in/9.093 mm
U 0.368 in/9.347 mm
V 0.377 in/9.576 mm
W 0.386 in/9.804 mm
X 0.397 in/10.08 mm
Y 0.404 in/10.26 mm
Z 0.413 in/10.49 mm
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