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Fractional-inch drill bit sizes, ANSI B94.11M-1979 No. / Letter | Decimal Inch | mm | No. / Letter | Decimal Inch | mm | No. / Letter | Decimal Inch | mm | 80 | 0.0135 | 0.343 | 1/8 | 0.1250 | 3.175 | O | 0.3160 | 8.026 | 79 | 0.0145 | 0.368 | 30 | 0.1285 | 3.264 | P | 0.3230 | 8.204 | 1/64 | 0.0156 | 0.397 | 29 | 0.1360 | 3.454 | 21/64 | 0.3281 | 8.334 | 78 | 0.0160 | 0.406 | 28 | 0.1405 | 3.569 | Q | 0.3320 | 8.433 | 77 | 0.0180 | 0.457 | 9/64 | 0.1406 | 3.572 | R | 0.3390 | 8.611 | 76 | 0.0200 | 0.508 | 27 | 0.1440 | 3.658 | 11/32 | 0.3437 | 8.731 | 75 | 0.0210 | 0.533 | 26 | 0.1470 | 3.734 | S | 0.3480 | 8.839 | 74 | 0.0225 | 0.572 | 25 | 0.1495 | 3.797 | T | 0.3580 | 9.093 | 73 | 0.0240 | 0.610 | 24 | 0.1520 | 3.861 | 23/64 | 0.3594 | 9.128 | 72 | 0.0250 | 0.635 | 23 | 0.1540 | 3.912 | U | 0.3680 | 9.347 | 71 | 0.0260 | 0.660 | 5/32 | 0.1562 | 3.969 | 3/8 | 0.3750 | 9.525 | 70 | 0.0280 | 0.711 | 22 | 0.1570 | 3.988 | V | 0.3770 | 9.576 | 69 | 0.0292 | 0.742 | 21 | 0.1590 | 4.039 | W | 0.3860 | 9.804 | 68 | 0.0310 | 0.787 | 20 | 0.1610 | 4.089 | 25/64 | 0.3906 | 9.922 | 1/32 | 0.0313 | 0.794 | 19 | 0.1660 | 4.216 | X | 0.3970 | 10.084 | 67 | 0.0320 | 0.813 | 18 | 0.1695 | 4.305 | Y | 0.4040 | 10.261 | 66 | 0.0330 | 0.838 | 11/64 | 0.1719 | 4.366 | 13/32 | 0.4062 | 10.319 | 65 | 0.0350 | 0.889 | 17 | 0.1730 | 4.394 | Z | 0.4130 | 10.490 | 64 | 0.0360 | 0.914 | 16 | 0.1770 | 4.496 | 27/64 | 0.4219 | 10.716 | 63 | 0.0370 | 0.940 | 15 | 0.1800 | 4.572 | 7/16 | 0.4375 | 11.113 | 62 | 0.0380 | 0.965 | 14 | 0.1820 | 4.623 | 29/64 | 0.4531 | 11.509 | 61 | 0.0390 | 0.991 | 13 | 0.1850 | 4.699 | 15/32 | 0.4687 | 11.906 | 60 | 0.0400 | 1.016 | 3/16 | 0.1875 | 4.763 | 31/64 | 0.4844 | 12.303 | 59 | 0.0410 | 1.041 | 12 | 0.1890 | 4.801 | 1/2 | 0.5000 | 12.700 | 58 | 0.0420 | 1.067 | 11 | 0.1910 | 4.851 | 33/64 | 0.5156 | 13.097 | 57 | 0.0430 | 1.092 | 10 | 0.1935 | 4.915 | 17/32 | 0.5312 | 13.494 | 56 | 0.0465 | 1.181 | 9 | 0.1960 | 4.978 | 35/64 | 0.5469 | 13.891 | 3/64 | 0.0469 | 1.191 | 8 | 0.1990 | 5.055 | 9/16 | 0.5625 | 14.288 | 55 | 0.0520 | 1.321 | 7 | 0.2010 | 5.105 | 37/64 | 0.5781 | 14.684 | 54 | 0.0550 | 1.397 | 13/64 | 0.2031 | 5.159 | 19/32 | 0.5937 | 15.081 | 53 | 0.0595 | 1.511 | 6 | 0.2040 | 5.182 | 39/64 | 0.6094 | 15.478 | 1/16 | 0.0625 | 1.588 | 5 | 0.2055 | 5.220 | 5/8 | 0.6250 | 15.875 | 52 | 0.0635 | 1.613 | 4 | 0.2090 | 5.309 | 41/64 | 0.6406 | 16.272 | 51 | 0.0670 | 1.702 | 3 | 0.2130 | 5.410 | 21/32 | 0.6562 | 16.669 | 50 | 0.0700 | 1.778 | 7/32 | 0.2187 | 5.556 | 43/64 | 0.6719 | 17.066 | 49 | 0.0730 | 1.854 | 2 | 0.2210 | 5.613 | 11/16 | 0.6875 | 17.463 | 48 | 0.0760 | 1.930 | 1 | 0.2280 | 5.791 | 45/64 | 0.7031 | 17.859 | 5/64 | 0.0781 | 1.984 | A | 0.2340 | 5.944 | 23/32 | 0.7187 | 18.256 | 47 | 0.0785 | 1.994 | 15/64 | 0.2344 | 5.953 | 47/64 | 0.7344 | 18.653 | 46 | 0.0810 | 2.057 | B | 0.2380 | 6.045 | 3/4 | 0.7500 | 19.050 | 45 | 0.0820 | 2.083 | C | 0.2420 | 6.147 | 49/64 | 0.7656 | 19.447 | 44 | 0.0860 | 2.184 | D | 0.2460 | 6.248 | 25/32 | 0.7812 | 19.844 | 43 | 0.0890 | 2.261 | E | 0.2500 | 6.350 | 51/64 | 0.7969 | 20.241 | 42 | 0.0935 | 2.375 | 1/4 | 0.2500 | 6.350 | 13/16 | 0.8125 | 20.638 | 3/32 | 0.0937 | 2.381 | F | 0.2570 | 6.528 | 53/64 | 0.8281 | 21.034 | 41 | 0.0960 | 2.438 | G | 0.2610 | 6.629 | 27/32 | 0.8437 | 21.431 | 40 | 0.0980 | 2.489 | 17/64 | 0.2656 | 6.747 | 55/64 | 0.8594 | 21.828 | 39 | 0.0995 | 2.527 | H | 0.2660 | 6.756 | 7/8 | 0.8750 | 22.225 | 38 | 0.1015 | 2.578 | I | 0.2720 | 6.909 | 57/64 | 0.8906 | 22.622 | 37 | 0.1040 | 2.642 | J | 0.2770 | 7.036 | 29/32 | 0.9062 | 23.019 | 36 | 0.1065 | 2.705 | K | 0.2811 | 7.137 | 59/64 | 0.9219 | 23.416 | 7/64 | 0.1093 | 2.778 | 9/32 | 0.2812 | 7.144 | 15/16 | 0.9375 | 23.813 | 35 | 0.1100 | 2.794 | L | 0.2900 | 7.366 | 57/64 | 0.8906 | 22.820 | 34 | 0.1110 | 2.819 | M | 0.2950 | 7.493 | 31/32 | 0.9687 | 24.606 | 33 | 0.1130 | 2.870 | 19/64 | 0.2968 | 7.541 | 63/64 | 0.9844 | 25.003 | 32 | 0.1160 | 2.946 | N | 0.3020 | 7.671 | 1 | 1.000 | 25.400 | 31 | 0.1200 | 3.048 | 5/16 | 0.3125 | 7.937 | - | - | - |
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