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Number, Letter and Fractional Drill sizes in inches and millimetres
Number, Letter and Fractional Drill Sizes
| drill | inch | mm | |
drill | inch | mm | |
drill | inch | mm |
| #80 | 0.0135 | 0.343 | | #40 | 0.0980 | 2.489 | | #2 | 0.2210 | 5.613 |
| #79 | 0.0145 | 0.368 | | #39 | 0.0995 | 2.527 | | #1 | 0.2280 | 5.791 |
| 1/64" | 0.0156 | 0.397 | | #38 | 0.1015 | 2.578 | | A | 0.2340 | 5.944 |
| #78 | 0.0160 | 0.406 | | #37 | 0.1040 | 2.642 | | 15/64" | 0.2344 | 5.953 |
| #77 | 0.0180 | 0.457 | | #36 | 0.1065 | 2.705 | | B | 0.2380 | 6.045 |
| #76 | 0.0200 | 0.508 | | 7/64" | 0.1094 | 2.778 | | C | 0.2420 | 6.147 |
| #75 | 0.0210 | 0.533 | | #35 | 0.1100 | 2.794 | | D | 0.2460 | 6.248 |
| #74 | 0.0225 | 0.572 | | #34 | 0.1110 | 2.819 | | 1/4" | 0.2500 | 6.350 |
| #73 | 0.0240 | 0.610 | | #33 | 0.1130 | 2.870 | | E | 0.2500 | 6.350 |
| #72 | 0.0250 | 0.635 | | #32 | 0.1160 | 2.946 | | F | 0.2570 | 6.528 |
| #71 | 0.0260 | 0.660 | | #31 | 0.1200 | 3.048 | | G | 0.2610 | 6.629 |
| #70 | 0.0280 | 0.711 | | 1/8" | 0.1250 | 3.175 | | 17/64" | 0.2656 | 6.747 |
| #69 | 0.0292 | 0.742 | | #30 | 0.1285 | 3.264 | | H | 0.2660 | 6.756 |
| #68 | 0.0310 | 0.787 | | #29 | 0.1360 | 3.454 | | I | 0.2720 | 6.909 |
| 1/32" | 0.0313 | 0.794 | | #28 | 0.1405 | 3.569 | | J | 0.2770 | 7.036 |
| #67 | 0.0320 | 0.813 | | 9/64" | 0.1406 | 3.572 | | K | 0.2810 | 7.137 |
| #66 | 0.0330 | 0.838 | | #27 | 0.1440 | 3.658 | | 9/32" | 0.2813 | 7.144 |
| #65 | 0.0350 | 0.889 | | #26 | 0.1470 | 3.734 | | L | 0.2900 | 7.366 |
| #64 | 0.0360 | 0.914 | | #25 | 0.1495 | 3.797 | | M | 0.2950 | 7.493 |
| #63 | 0.0370 | 0.940 | | #24 | 0.1520 | 3.861 | | 19/64" | 0.2969 | 7.541 |
| #62 | 0.0380 | 0.965 | | #23 | 0.1540 | 3.912 | | N | 0.3020 | 7.671 |
| #61 | 0.0390 | 0.991 | | 5/32" | 0.1563 | 3.969 | | 5/16" | 0.3125 | 7.938 |
| #60 | 0.0400 | 1.016 | | #22 | 0.1570 | 3.988 | | O | 0.3160 | 8.026 |
| #59 | 0.0410 | 1.041 | | #21 | 0.1590 | 4.039 | | P | 0.3230 | 8.204 |
| #58 | 0.0420 | 1.067 | | #20 | 0.1610 | 4.089 | | 21/64" | 0.3281 | 8.334 |
| #57 | 0.0430 | 1.092 | | #19 | 0.1660 | 4.216 | | Q | 0.3320 | 8.433 |
| #56 | 0.0465 | 1.181 | | #18 | 0.1695 | 4.305 | | R | 0.3390 | 8.611 |
| 3/64" | 0.0469 | 1.191 | | 11/64" | 0.1719 | 4.366 | | 11/32" | 0.3438 | 8.731 |
| #55 | 0.0520 | 1.321 | | #17 | 0.1730 | 4.394 | | S | 0.3480 | 8.839 |
| #54 | 0.0550 | 1.397 | | #16 | 0.1770 | 4.496 | | T | 0.3580 | 9.093 |
| #53 | 0.0595 | 1.511 | | #15 | 0.1800 | 4.572 | | 23/64" | 0.3594 | 9.128 |
| 1/16" | 0.0625 | 1.588 | | #14 | 0.1820 | 4.623 | | U | 0.3680 | 9.347 |
| #52 | 0.0635 | 1.613 | | #13 | 0.1850 | 4.699 | | 3/8" | 0.3750 | 9.525 |
| #51 | 0.0670 | 1.702 | | 3/16" | 0.1875 | 4.763 | | V | 0.3770 | 9.576 |
| #50 | 0.0700 | 1.778 | | #12 | 0.1890 | 4.801 | | W | 0.3860 | 9.804 |
| #49 | 0.0730 | 1.854 | | #11 | 0.1910 | 4.851 | | 25/64" | 0.3906 | 9.922 |
| #48 | 0.0760 | 1.930 | | #10 | 0.1935 | 4.915 | | X | 0.3970 | 10.084 |
| 5/64" | 0.0781 | 1.984 | | #9 | 0.1960 | 4.978 | | Y | 0.4040 | 10.262 |
| #47 | 0.0785 | 1.994 | | #8 | 0.1990 | 5.055 | | 13/32" | 0.4063 | 10.319 |
| #46 | 0.0810 | 2.057 | | #7 | 0.2010 | 5.105 | | Z | 0.4130 | 10.490 |
| #45 | 0.0820 | 2.083 | | 13/64" | 0.2031 | 5.159 | | 27/64" | 0.4219 | 10.716 |
| #44 | 0.0860 | 2.184 | | #6 | 0.2040 | 5.182 | | 7/16" | 0.4375 | 11.113 |
| #43 | 0.0890 | 2.261 | | #5 | 0.2055 | 5.220 | | 29/64" | 0.4531 | 11.509 |
| #42 | 0.0935 | 2.375 | | #4 | 0.2090 | 5.309 | | 15/32" | 0.4688 | 11.906 |
| 3/32" | 0.0938 | 2.381 | | #3 | 0.2130 | 5.410 | | 31/64" | 0.4844 | 12.303 |
| #41 | 0.0960 | 2.438 | | 7/32" | 0.2188 | 5.556 | | 1/2" | 0.5000 | 12.700 |