| Drill Number | Dia (inches) | Equivalent dia ISO mm |
Dia (inches) |
|---|---|---|---|
| 80 | 0.0135 | 0.35mm | 0.0138 |
| 79 | 0.0145 | 0.38mm | 0.0150 |
| 78 | 0.0160 | 0.40mm | 0.0157 |
| 77 | 0.0180 | 0.45mm | 0.0177 |
| 76 | 0.0200 | 0.50mm | 0.0197 |
| 75 | 0.0210 | 0.52mm | 0.0205 |
| 74 | 0.0225 | 0.58mm | 0.0228 |
| 73 | 0.0240 | 0.60mm | 0.0236 |
| 72 | 0.0250 | 0.65mm | 0.0256 |
| 71 | 0.0260 | 0.65mm | 0.0256 |
| 70 | 0.0280 | 0.70mm | 0.0276 |
| 69 | 0.0292 | 0.75mm | 0.0295 |
| 68 | 0.0310 | 1/32" | 0.3120 |
| 67 | 0.0320 | 0.82mm | 0.0323 |
| 66 | 0.0330 | 0.85mm | 0.0335 |
| 65 | 0.0350 | 0.90mm | 0.0354 |
| 64 | 0.0360 | 0.92mm | 0.0362 |
| 63 | 0.0370 | 0.95mm | 0.0374 |
| 62 | 0.0380 | 0.98mm | 0.0386 |
| 61 | 0.0390 | 1.00mm | 0.0394 |
| 60 | 0.0400 | 1.00mm | 0.0394 |
| 59 | 0.0410 | 1.05mm | 0.0413 |
| 58 | 0.0420 | 1.05mm | 0.0413 |
| 57 | 0.0430 | 1.10mm | 0.0433 |
| 56 | 0.0465 | 3/64" | 0.0469 |
| 55 | 0.0520 | 1.30mm | 0.0512 |
| 54 | 0.0550 | 1.40mm | 0.0551 |
| 53 | 0.0595 | 1.50mm | 0.0591 |
| 52 | 0.0635 | 1.60mm | 0.0630 |
| 51 | 0.0670 | 1.70mm | 0.0669 |
| 50 | 0.0700 | 1.80mm | 0.0709 |
| 49 | 0.0730 | 1.85mm | 0.0728 |
| 48 | 0.0760 | 1.95mm | 0.0768 |
| 47 | 0.0785 | 2.00mm | 0.0787 |
| 46 | 0.0810 | 2.05mm | 0.0807 |
| 45 | 0.0820 | 2.10mm | 0.0827 |
| 44 | 0.0860 | 2.20mm | 0.0866 |
| 43 | 0.0890 | 2.25mm | 0.0886 |
| 42 | 0.0935 | 3/32" | 0.0938 |
| 41 | 0.0960 | 2.45mm | 0.0965 |
| 40 | 0.0980 | 2.50mm | 0.0984 |
| 39 | 0.0995 | 2.55mm | 0.1004 |
| 38 | 0.1015 | 2.60mm | 0.1024 |
| 37 | 0.1040 | 2.65mm | 0.1043 |
| 36 | 0.1065 | 2.70mm | 0.1063 |
| 35 | 0.1100 | 2.80mm | 0.1102 |
| 34 | 0.1110 | 2.80mm | 0.1102 |
| 33 | 0.1130 | 2.85mm | 0.1122 |
| 32 | 0.1160 | 2.95mm | 0.1161 |
| 31 | 0.1200 | 3.00mm | 0.1181 |
| 30 | 0.1285 | 3.30mm | 0.1299 |
| 29 | 0.1360 | 3.50mm | 0.1378 |
| 28 | 0.1405 | 9/64" | 0.1406 |
| 27 | 0.1440 | 3.70mm | 0.1457 |
| 26 | 0.1470 | 3.70mm | 0.1457 |
| 25 | 0.1495 | 3.80mm | 0.1496 |
| 24 | 0.1520 | 3.90mm | 0.1535 |
| 23 | 0.1540 | 3.90mm | 0.1535 |
| 22 | 0.1570 | 4.00mm | 0.1575 |
| 21 | 0.1590 | 4.10mm | 0.1614 |
| 20 | 0.1610 | 4.10mm | 0.1614 |
| 19 | 0.1660 | 4.20mm | 0.1654 |
| 18 | 0.1695 | 4.30mm | 0.1693 |
| 17 | 0.1730 | 4.40mm | 0.1732 |
| 16 | 0.1770 | 4.50mm | 0.1772 |
| 15 | 0.1800 | 4.60mm | 0.1811 |
| 14 | 0.1820 | 4.60mm | 0.1811 |
| 13 | 0.1850 | 4.70mm | 0.1850 |
| 12 | 0.1890 | 4.80mm | 0.1890 |
| 11 | 0.1910 | 4.90mm | 0.1929 |
| 10 | 0.1935 | 4.90mm | 0.1929 |
| 9 | 0.1960 | 5.00mm | 0.1969 |
| 8 | 0.1990 | 5.10mm | 0.2008 |
| 7 | 0.2010 | 5.10mm | 0.2008 |
| 6 | 0.2040 | 5.20mm | 0.2047 |
| 5 | 0.2055 | 5.20mm | 0.2047 |
| 4 | 0.2090 | 5.30mm | 0.2087 |
| 3 | 0.2130 | 5.40mm | 0.2126 |
| 2 | 0.2210 | 5.60mm | 0.2205 |
| 1 | 0.2280 | 5.80mm | 0.2283 |
| A | 0.2340 | 15/64" | 0.2344 |
| B | 0.2380 | 6.00mm | 0.2362 |
| C | 0.2420 | 6.10mm | 0.2402 |
| D | 0.2460 | 6.20mm | 0.2441 |
| E | 0.2500 | 1/4" | 0.2500 |
| F | 0.2570 | 6.50mm | 0.2559 |
| G | 0.2610 | 6.60mm | 0.2598 |
| H | 0.2660 | 17/64" | 0.2656 |
| I | 0.2720 | 6.90mm | 0.2717 |
| J | 0.2770 | 7.00mm | 0.2756 |
| K | 0.2810 | 9/32" | 0.2812 |
| L | 0.2900 | 7.40mm | 0.2913 |
| M | 0.2950 | 7.50mm | 0.2953 |
| N | 0.3020 | 7.70mm | 0.3031 |
| O | 0.3160 | 8.00mm | 0.3150 |
| P | 0.3230 | 8.20mm | 0.3228 |
| Q | 0.3320 | 8.40mm | 0.3307 |
| R | 0.3390 | 8.60mm | 0.3386 |
| S | 0.3480 | 8.80mm | 0.3465 |
| T | 0.3580 | 9.10mm | 0.3583 |
| U | 0.3680 | 9.30mm | 0.3661 |
| V | 0.3770 | 3/8" | 0.3750 |
| W | 0.3860 | 9.80mm | 0.3858 |
| X | 0.3970 | 10.10mm | 0.3976 |
| Y | 0.4040 | 10.30mm | 0.4055 |
| Z | 0.4130 | 10.50mm | 0.4134 |