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 |
| - |
- |
|