Number Drill Sizes
This chart shows the diameters of number gauge drills size 80 (the smallest) to size 1 (the largest).
| Drill | Inch | mm |
|---|---|---|
| 80 | 0.0135 | 0.34 |
| 79 | 0.0145 | 0.37 |
| 78 | 0.016 | 0.41 |
| 77 | 0.018 | 0.46 |
| 76 | 0.020 | 0.51 |
| 75 | 0.021 | 0.53 |
| 74 | 0.0225 | 0.57 |
| 73 | 0.024 | 0.61 |
| 72 | 0.025 | 0.64 |
| 71 | 0.026 | 0.66 |
| 70 | 0.028 | 0.71 |
| 69 | 0.029 | 0.74 |
| 68 | 0.031 | 0.79 |
| 67 | 0.032 | 0.81 |
| 66 | 0.033 | 0.84 |
| 65 | 0.035 | 0.89 |
| 64 | 0.036 | 0.91 |
| 63 | 0.037 | 0.94 |
| 62 | 0.038 | 0.97 |
| 61 | 0.039 | 0.99 |
| 60 | 0.040 | 1.02 |
| 59 | 0.041 | 1.04 |
| 58 | 0.042 | 1.07 |
| 57 | 0.043 | 1.09 |
| 56 | 0.0465 | 1.18 |
| 55 | 0.052 | 1.32 |
| 54 | 0.055 | 1.40 |
| 53 | 0.0595 | 1.51 |
| 52 | 0.0635 | 1.61 |
| 51 | 0.067 | 1.70 |
| 50 | 0.070 | 1.78 |
| 49 | 0.073 | 1.85 |
| 48 | 0.076 | 1.93 |
| 47 | 0.0785 | 1.99 |
| 46 | 0.081 | 2.06 |
| 45 | 0.082 | 2.08 |
| 44 | 0.086 | 2.18 |
| 43 | 0.089 | 2.26 |
| 42 | 0.0935 | 2.37 |
| 41 | 0.096 | 2.44 |
| 40 | 0.098 | 2.49 |
| 39 | 0.0995 | 2.53 |
| 38 | 0.1015 | 2.58 |
| 37 | 0.104 | 2.64 |
| 36 | 0.1065 | 2.71 |
| 35 | 0.11 | 2.79 |
| 34 | 0.111 | 2.82 |
| 33 | 0.113 | 2.87 |
| 32 | 0.116 | 2.95 |
| 31 | 0.120 | 3.05 |
| 30 | 0.1285 | 3.26 |
| 29 | 0.136 | 3.45 |
| 28 | 0.14 | 3.56 |
| 27 | 0.144 | 3.66 |
| 26 | 0.147 | 3.73 |
| 25 | 0.150 | 3.81 |
| 24 | 0.152 | 3.86 |
| 23 | 0.154 | 3.91 |
| 22 | 0.157 | 3.99 |
| 21 | 0.159 | 4.04 |
| 20 | 0.161 | 4.09 |
| 19 | 0.166 | 4.22 |
| 18 | 0.170 | 4.32 |
| 17 | 0.173 | 4.39 |
| 16 | 0.177 | 4.50 |
| 15 | 0.18 | 4.57 |
| 14 | 0.182 | 4.62 |
| 13 | 0.185 | 4.70 |
| 12 | 0.189 | 4.80 |
| 11 | 0.191 | 4.85 |
| 10 | 0.193 | 4.90 |
| 9 | 0.196 | 4.98 |
| 8 | 0.199 | 5.05 |
| 7 | 0.201 | 5.11 |
| 6 | 0.204 | 5.18 |
| 5 | 0.205 | 5.21 |
| 4 | 0.209 | 5.31 |
| 3 | 0.213 | 5.41 |
| 2 | 0.221 | 5.61 |
| 1 | 0.228 | 5.79 |