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 |
- |
- |
- |
|
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 |
- |
- |
|