Skip to main content Drill Chart
ANSI | Fractional | ISO | in | mm |
107 | | | 0.0019 | 0.048 |
| | 0.05 | 0.002 | 0.05 |
106 | | | 0.0023 | 0.058 |
105 | | | 0.0027 | 0.069 |
104 | | | 0.0031 | 0.079 |
103 | | | 0.0035 | 0.089 |
102 | | | 0.0039 | 0.099 |
| | 0.1 | 0.0039 | 0.1 |
101 | | | 0.0043 | 0.109 |
100 | | | 0.0047 | 0.119 |
99 | | | 0.0051 | 0.13 |
98 | | | 0.0055 | 0.14 |
97 | | | 0.0059 | 0.15 |
96 | | | 0.0063 | 0.16 |
95 | | | 0.0067 | 0.17 |
94 | | | 0.0071 | 0.18 |
93 | | | 0.0075 | 0.191 |
| | 0.2 | 0.0079 | 0.2 |
92 | | | 0.0079 | 0.201 |
91 | | | 0.0083 | 0.211 |
90 | | | 0.0087 | 0.221 |
89 | | | 0.0091 | 0.231 |
88 | | | 0.0095 | 0.241 |
| | 0.25 | 0.0098 | 0.25 |
87 | | | 0.01 | 0.254 |
86 | | | 0.0105 | 0.267 |
85 | | | 0.011 | 0.279 |
84 | | | 0.0115 | 0.292 |
| | 0.3 | 0.0118 | 0.3 |
83 | | | 0.012 | 0.305 |
82 | | | 0.0125 | 0.318 |
81 | | | 0.013 | 0.33 |
80 | | | 0.0135 | 0.343 |
| | 0.35 | 0.0138 | 0.35 |
79 | | | 0.0145 | 0.368 |
| | 0.38 | 0.015 | 0.38 |
| 1/64 | | 0.0156 | 0.396 |
| | 0.4 | 0.0157 | 0.4 |
78 | | | 0.016 | 0.406 |
| | 0.42 | 0.0165 | 0.42 |
| | 0.44 | 0.0173 | 0.44 |
| | 0.45 | 0.0177 | 0.45 |
77 | | | 0.018 | 0.457 |
| | 0.46 | 0.0181 | 0.46 |
| | 0.48 | 0.0189 | 0.48 |
| | 0.5 | 0.0197 | 0.5 |
76 | | | 0.02 | 0.508 |
75 | | | 0.021 | 0.533 |
| | 0.55 | 0.0217 | 0.55 |
74 | | | 0.0225 | 0.572 |
| | 0.6 | 0.0236 | 0.6 |
73 | | | 0.024 | 0.61 |
72 | | | 0.025 | 0.635 |
| | 0.65 | 0.0256 | 0.65 |
71 | | | 0.026 | 0.66 |
| | 0.7 | 0.0276 | 0.7 |
70 | | | 0.028 | 0.711 |
69 | | | 0.0292 | 0.742 |
| | 0.75 | 0.0295 | 0.75 |
68 | | | 0.031 | 0.787 |
| 1/32 | | 0.0313 | 0.795 |
| | 0.8 | 0.0315 | 0.8 |
67 | | | 0.032 | 0.813 |
66 | | | 0.033 | 0.838 |
| | 0.85 | 0.0335 | 0.85 |
65 | | | 0.035 | 0.889 |
| | 0.9 | 0.0354 | 0.9 |
64 | | | 0.036 | 0.914 |
63 | | | 0.037 | 0.94 |
| | 0.95 | 0.0374 | 0.95 |
62 | | | 0.038 | 0.965 |
61 | | | 0.039 | 0.991 |
| | 1 | 0.0394 | 1 |
60 | | | 0.04 | 1.016 |
59 | | | 0.041 | 1.041 |
| | 1.05 | 0.0413 | 1.05 |
58 | | | 0.042 | 1.067 |
57 | | | 0.043 | 1.092 |
| | 1.1 | 0.0433 | 1.1 |
| | 1.15 | 0.0453 | 1.15 |
56 | | | 0.0465 | 1.181 |
| 3/64 | | 0.0469 | 1.191 |
| | 1.2 | 0.0472 | 1.2 |
| | 1.25 | 0.0492 | 1.25 |
| | 1.3 | 0.0512 | 1.3 |
55 | | | 0.052 | 1.321 |
| | 1.35 | 0.0532 | 1.35 |
54 | | | 0.055 | 1.397 |
| | 1.4 | 0.0551 | 1.4 |
| | 1.45 | 0.0571 | 1.45 |
| | 1.5 | 0.0591 | 1.5 |
53 | | | 0.0595 | 1.511 |
| | 1.55 | 0.061 | 1.55 |
| 1/16 | | 0.0625 | 1.588 |
| | 1.6 | 0.063 | 1.6 |
52 | | | 0.0635 | 1.613 |
| | 1.65 | 0.065 | 1.65 |
| | 1.7 | 0.0669 | 1.7 |
51 | | | 0.067 | 1.702 |
| | 1.75 | 0.0689 | 1.75 |
50 | | | 0.07 | 1.778 |
| | 1.8 | 0.0709 | 1.8 |
| | 1.85 | 0.0728 | 1.85 |
49 | | | 0.073 | 1.854 |
| | 1.9 | 0.0748 | 1.9 |
48 | | | 0.076 | 1.93 |
| | 1.95 | 0.0768 | 1.95 |
| | 1.96 | 0.0771 | 1.96 |
| | 1.97 | 0.0776 | 1.97 |
| 5/64 | | 0.0781 | 1.984 |
47 | | | 0.0785 | 1.994 |
| | 2 | 0.0787 | 2 |
| | 2.01 | 0.0791 | 2.01 |
| | 2.02 | 0.0795 | 2.02 |
| | 2.03 | 0.0799 | 2.03 |
| | 2.04 | 0.0803 | 2.04 |
| | 2.05 | 0.0807 | 2.05 |
46 | | | 0.081 | 2.057 |
| | 2.07 | 0.0815 | 2.07 |
45 | | | 0.082 | 2.083 |
| | 2.09 | 0.0823 | 2.09 |
| | 2.1 | 0.0827 | 2.1 |
| | 2.11 | 0.0831 | 2.11 |
| | 2.12 | 0.0835 | 2.12 |
| | 2.13 | 0.0839 | 2.13 |
| | 2.14 | 0.0843 | 2.14 |
| | 2.15 | 0.0846 | 2.15 |
| | 2.16 | 0.085 | 2.16 |
| | 2.17 | 0.0854 | 2.17 |
44 | | | 0.086 | 2.184 |
| | 2.19 | 0.0862 | 2.19 |
| | 2.2 | 0.0866 | 2.2 |
| | 2.21 | 0.087 | 2.21 |
| | 2.22 | 0.0874 | 2.22 |
| | 2.23 | 0.0878 | 2.23 |
| | 2.24 | 0.0882 | 2.24 |
| | 2.25 | 0.0886 | 2.25 |
| | 2.26 | 0.089 | 2.26 |
43 | | | 0.089 | 2.261 |
| | 2.27 | 0.0894 | 2.27 |
| | 2.28 | 0.0898 | 2.28 |
| | 2.29 | 0.0902 | 2.29 |
| | 2.3 | 0.0906 | 2.3 |
| | 2.31 | 0.0909 | 2.31 |
| | 2.32 | 0.0913 | 2.32 |
| | 2.33 | 0.0917 | 2.33 |
| | 2.34 | 0.0921 | 2.34 |
| | 2.35 | 0.0925 | 2.35 |
42 | | | 0.0935 | 2.375 |
| 3/32 | | 0.0937 | 2.38 |
| | 2.4 | 0.0945 | 2.4 |
41 | | | 0.096 | 2.438 |
| | 2.45 | 0.0965 | 2.45 |
40 | | | 0.098 | 2.489 |
| | 2.5 | 0.0984 | 2.5 |
39 | | | 0.0995 | 2.527 |
| | 2.55 | 0.1004 | 2.55 |
38 | | | 0.1015 | 2.578 |
| | 2.6 | 0.1024 | 2.6 |
37 | | | 0.104 | 2.642 |
| | 2.65 | 0.1043 | 2.65 |
| | 2.7 | 0.1063 | 2.7 |
36 | | | 0.1065 | 2.705 |
| | 2.75 | 0.1083 | 2.75 |
| 7/64 | | 0.1093 | 2.776 |
35 | | | 0.11 | 2.794 |
| | 2.8 | 0.1102 | 2.8 |
34 | | | 0.111 | 2.819 |
33 | | | 0.113 | 2.87 |
| | 2.9 | 0.1142 | 2.9 |
32 | | | 0.116 | 2.946 |
| | 3 | 0.1181 | 3 |
31 | | | 0.12 | 3.048 |
| | 3.1 | 0.122 | 3.1 |
| 1/8 | | 0.125 | 3.175 |
| | 3.2 | 0.126 | 3.2 |
| | 3.25 | 0.1279 | 3.25 |
30 | | | 0.1285 | 3.264 |
| | 3.3 | 0.1299 | 3.3 |
| | 3.4 | 0.1339 | 3.4 |
29 | | | 0.136 | 3.454 |
| | 3.5 | 0.1378 | 3.5 |
28 | | | 0.1405 | 3.569 |
| 9/64 | | 0.1406 | 3.571 |
| | 3.6 | 0.1417 | 3.6 |
27 | | | 0.144 | 3.658 |
| | 3.7 | 0.1457 | 3.7 |
26 | | | 0.147 | 3.734 |
| | 3.75 | 0.1476 | 3.75 |
25 | | | 0.1495 | 3.797 |
| | 3.8 | 0.1496 | 3.8 |
24 | | | 0.152 | 3.861 |
| | 3.9 | 0.1535 | 3.9 |
23 | | | 0.154 | 3.912 |
| 5/32 | | 0.1562 | 3.967 |
22 | | | 0.157 | 3.988 |
| | 4 | 0.1575 | 4 |
21 | | | 0.159 | 4.039 |
20 | | | 0.161 | 4.089 |
| | 4.1 | 0.1614 | 4.1 |
| | 4.2 | 0.1654 | 4.2 |
19 | | | 0.166 | 4.216 |
| | 4.25 | 0.1673 | 4.25 |
| | 4.3 | 0.1693 | 4.3 |
18 | | | 0.1695 | 4.305 |
| 11/64 | | 0.1719 | 4.366 |
17 | | | 0.173 | 4.394 |
| | 4.4 | 0.1732 | 4.4 |
16 | | | 0.177 | 4.496 |
| | 4.5 | 0.1772 | 4.5 |
15 | | | 0.18 | 4.572 |
| | 4.6 | 0.1811 | 4.6 |
14 | | | 0.182 | 4.623 |
13 | | | 0.185 | 4.699 |
| | 4.7 | 0.185 | 4.7 |
| | 4.75 | 0.187 | 4.75 |
| 3/16 | | 0.1875 | 4.763 |
| | 4.8 | 0.189 | 4.8 |
12 | | | 0.189 | 4.801 |
11 | | | 0.191 | 4.851 |
| | 4.9 | 0.1929 | 4.9 |
10 | | | 0.1935 | 4.915 |
9 | | | 0.196 | 4.978 |
| | 5 | 0.1969 | 5 |
8 | | | 0.199 | 5.055 |
| | 5.1 | 0.2008 | 5.1 |
7 | | | 0.201 | 5.105 |
| 13/64 | | 0.2031 | 5.159 |
6 | | | 0.204 | 5.182 |
| | 5.2 | 0.2047 | 5.2 |
5 | | | 0.2055 | 5.22 |
| | 5.25 | 0.2067 | 5.25 |
| | 5.3 | 0.2087 | 5.3 |
4 | | | 0.209 | 5.309 |
| | 5.4 | 0.2126 | 5.4 |
3 | | | 0.213 | 5.41 |
| | 5.5 | 0.2165 | 5.5 |
| 7/32 | | 0.2187 | 5.555 |
| | 5.6 | 0.2205 | 5.6 |
2 | | | 0.221 | 5.613 |
| | 5.7 | 0.2244 | 5.7 |
| | 5.75 | 0.2264 | 5.75 |
1 | | | 0.228 | 5.791 |
| | 5.8 | 0.2283 | 5.8 |
| | 5.9 | 0.2323 | 5.9 |
A | | | 0.234 | 5.944 |
| 15/64 | | 0.2344 | 5.954 |
| | 6 | 0.2362 | 6 |
B | | | 0.238 | 6.045 |
| | 6.1 | 0.2402 | 6.1 |
C | | | 0.242 | 6.147 |
| | 6.2 | 0.2441 | 6.2 |
D | | | 0.246 | 6.248 |
| | 6.25 | 0.2461 | 6.25 |
| | 6.3 | 0.248 | 6.3 |
E | 1/4 | | 0.25 | 6.35 |
| | 6.4 | 0.252 | 6.4 |
| | 6.5 | 0.2559 | 6.5 |
F | | | 0.257 | 6.528 |
| | 6.6 | 0.2598 | 6.6 |
G | | | 0.261 | 6.629 |
| | 6.7 | 0.2638 | 6.7 |
| 17/64 | | 0.2656 | 6.746 |
| | 6.75 | 0.2657 | 6.75 |
H | | | 0.266 | 6.756 |
| | 6.8 | 0.2677 | 6.8 |
| | 6.9 | 0.2717 | 6.9 |
I | | | 0.272 | 6.909 |
| | 7 | 0.2756 | 7 |
J | | | 0.277 | 7.036 |
| | 7.1 | 0.2795 | 7.1 |
K | | | 0.2811 | 7.14 |
| 9/32 | | 0.2812 | 7.142 |
| | 7.2 | 0.2835 | 7.2 |
| | 7.25 | 0.2854 | 7.25 |
| | 7.3 | 0.2874 | 7.3 |
L | | | 0.29 | 7.366 |
| | 7.4 | 0.2913 | 7.4 |
M | | | 0.295 | 7.493 |
| | 7.5 | 0.2953 | 7.5 |
| 19/64 | | 0.2968 | 7.539 |
| | 7.6 | 0.2992 | 7.6 |
N | | | 0.302 | 7.671 |
| | 7.7 | 0.3032 | 7.7 |
| | 7.75 | 0.3051 | 7.75 |
| | 7.8 | 0.3071 | 7.8 |
| | 7.9 | 0.311 | 7.9 |
| 5/16 | | 0.3125 | 7.938 |
| | 8 | 0.315 | 8 |
O | | | 0.316 | 8.026 |
| | 8.1 | 0.3189 | 8.1 |
| | 8.2 | 0.3228 | 8.2 |
P | | | 0.323 | 8.204 |
| | 8.25 | 0.3248 | 8.25 |
| | 8.3 | 0.3268 | 8.3 |
| 21/64 | | 0.3281 | 8.334 |
| | 8.4 | 0.3307 | 8.4 |
Q | | | 0.332 | 8.433 |
| | 8.5 | 0.3346 | 8.5 |
| | 8.6 | 0.3386 | 8.6 |
R | | | 0.339 | 8.611 |
| | 8.7 | 0.3425 | 8.7 |
| 11/32 | | 0.3437 | 8.73 |
| | 8.75 | 0.3445 | 8.75 |
| | 8.8 | 0.3465 | 8.8 |
S | | | 0.348 | 8.839 |
| | 8.9 | 0.3504 | 8.9 |
| | 9 | 0.3543 | 9 |
T | | | 0.358 | 9.093 |
| | 9.1 | 0.3583 | 9.1 |
| 23/64 | | 0.3594 | 9.129 |
| | 9.2 | 0.3622 | 9.2 |
| | 9.25 | 0.3642 | 9.25 |
| | 9.3 | 0.3661 | 9.3 |
U | | | 0.368 | 9.347 |
| | 9.4 | 0.3701 | 9.4 |
| | 9.5 | 0.374 | 9.5 |
| 3/8 | | 0.375 | 9.525 |
V | | | 0.377 | 9.576 |
| | 9.6 | 0.378 | 9.6 |
| | 9.7 | 0.3819 | 9.7 |
| | 9.75 | 0.3839 | 9.75 |
| | 9.8 | 0.3858 | 9.8 |
W | | | 0.386 | 9.804 |
| | 9.9 | 0.3898 | 9.9 |
| 25/64 | | 0.3906 | 9.921 |
| | 10 | 0.3937 | 10 |
X | | | 0.397 | 10.084 |
| | 10.2 | 0.4016 | 10.2 |
Y | | | 0.404 | 10.262 |
| 13/32 | | 0.4062 | 10.317 |
Z | | | 0.413 | 10.49 |
| | 10.5 | 0.4134 | 10.5 |
| | 10.7 | 0.4213 | 10.7 |
| 27/64 | | 0.4219 | 10.716 |
| | 10.8 | 0.4252 | 10.8 |
| | 10.9 | 0.4291 | 10.9 |
| | 11 | 0.4331 | 11 |
| 7/16 | | 0.4375 | 11.113 |
| | 11.2 | 0.4409 | 11.2 |
| | 11.5 | 0.4528 | 11.5 |
| 29/64 | | 0.4531 | 11.509 |
| | 11.8 | 0.4646 | 11.8 |
| 15/32 | | 0.4687 | 11.905 |
| | 12 | 0.4724 | 12 |
| | 12.2 | 0.4803 | 12.2 |
| 31/64 | | 0.4844 | 12.304 |
| | 12.5 | 0.4921 | 12.5 |
| 1/2 | 12.7 | 0.5 | 12.7 |
| | 12.8 | 0.5039 | 12.8 |
| | 13 | 0.5118 | 13 |
| 33/64 | | 0.5156 | 13.096 |
| 17/32 | | 0.5312 | 13.492 |
| | 13.5 | 0.5315 | 13.5 |
| 35/64 | | 0.5469 | 13.891 |
| | 14 | 0.5512 | 14 |
| | 14.2 | 0.5591 | 14.2 |
| 9/16 | | 0.5625 | 14.288 |
| | 14.5 | 0.5709 | 14.5 |
| 37/64 | | 0.5781 | 14.684 |
| | 14.7 | 0.5787 | 14.7 |
| | 15 | 0.5906 | 15 |
| 19/32 | | 0.5937 | 15.08 |
| 39/64 | | 0.6094 | 15.479 |
| | 15.5 | 0.6102 | 15.5 |
| 5/8 | | 0.625 | 15.875 |
| | 16 | 0.6299 | 16 |
| 41/64 | | 0.6406 | 16.271 |
| | 16.5 | 0.6496 | 16.5 |
| 21/32 | | 0.6562 | 16.667 |
| | 16.8 | 0.6614 | 16.8 |
| | 17 | 0.6693 | 17 |
| 43/64 | | 0.6719 | 17.066 |
| 11/16 | | 0.6875 | 17.463 |
| | 17.5 | 0.689 | 17.5 |
| 45/64 | | 0.7031 | 17.859 |
| | 18 | 0.7087 | 18 |
| 23/32 | | 0.7187 | 18.255 |
| | 18.5 | 0.7283 | 18.5 |
| 47/64 | | 0.7344 | 18.654 |
| | 19 | 0.748 | 19 |
| 3/4 | | 0.75 | 19.05 |
| 49/64 | | 0.7656 | 19.446 |
| | 19.5 | 0.7677 | 19.5 |
| 25/32 | | 0.7812 | 19.842 |
| | 20 | 0.7874 | 20 |
| 51/64 | | 0.7969 | 20.241 |
| | 20.5 | 0.8071 | 20.5 |
| 13/16 | | 0.8125 | 20.638 |
| | 21 | 0.8268 | 21 |
| 53/64 | | 0.8281 | 21.034 |
| 27/32 | | 0.8437 | 21.43 |
| | 21.5 | 0.8465 | 21.5 |
| 55/64 | | 0.8594 | 21.829 |
| | 22 | 0.8661 | 22 |
| 7/8 | | 0.875 | 22.225 |
| | 22.5 | 0.8858 | 22.5 |
| 57/64 | | 0.8906 | 22.621 |
| | 23 | 0.9055 | 23 |
| 29/32 | | 0.9062 | 23.017 |
| 59/64 | | 0.9219 | 23.416 |
| | 23.5 | 0.9252 | 23.5 |
| 15/16 | | 0.9375 | 23.813 |
| | 24 | 0.9449 | 24 |
| 61/64 | | 0.9531 | 24.209 |
| | 24.5 | 0.9646 | 24.5 |
| 31/32 | | 0.9687 | 24.605 |
| | 25 | 0.9843 | 25 |
| 63/64 | | 0.9844 | 25.004 |
| 1 | | 1 | 25.4 |
| | 25.5 | 1.0039 | 25.5 |
| | 26 | 1.0236 | 26 |