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Original on http://www.aracnet.com/~gpatrick/drill.html
| Standard Drill Sizes Unless otherwise marked, dimensions are in inches. Cyan sizes are metric drills, (all have two decimal places) Yellow sizes are numbered drills, (also marked with #) Green sizes are fractional drills (all have / in number.) (Typo at 2.35mm corrected was 0.0295) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Hole | Size | Hole | Size | Hole | Size | Hole | Size | Hole | |||||
| 0.10 | .0040 | 0.80 | .0315 | #46 | .0810 | 3.80 | .1496 | 5.70 | .2244 | |||||
| 0.13 | .0050 | #67 | .0320 | #45 | .0820 | #24 | .1520 | 5.75 | .2264 | |||||
| 0.15 | .0059 | #66 | .0330 | 2.10 | .0827 | 3.90 | .1535 | #1 | .2280 | |||||
| #97 | .0059 | 0.85 | .0335 | 2.15 | .0846 | #23 | .1540 | 5.80 | .2283 | |||||
| #96 | .0063 | #65 | .0350 | #44 | .0860 | 5/32 | .1562 | 5.90 | .2323 | |||||
| #95 | .0067 | 0.90 | .0354 | 2.20 | .0866 | #22 | .1570 | #A | .2340 | |||||
| #94 | .0071 | #64 | .0360 | 2.25 | .0886 | 4.00 | .1575 | 15/64 | .2344 | |||||
| #93 | .0075 | #63 | .0370 | #43 | .0890 | #21 | .1590 | 6.00 | .2362 | |||||
| #92 | .0079 | 0.95 | .0374 | 2.30 | .0906 | #20 | .1610 | #B | .2380 | |||||
| 0.20 | .0079 | #62 | .0380 | 2.35 | .0925 | 4.10 | .1614 | 6.10 | .2402 | |||||
| #91 | .0083 | #61 | .0390 | #42 | .0935 | 4.20 | .1654 | #C | .2420 | |||||
| #90 | .0087 | 1.00 | .0394 | 3/32 | .0938 | #19 | .1660 | 6.20 | .2441 | |||||
| 0.22 | .0087 | #60 | .0400 | 2.40 | .0945 | 4.25 | .1673 | #D | .2460 | |||||
| #89 | .0091 | #59 | .0410 | #41 | .0960 | 4.30 | .1693 | 6.25 | .2461 | |||||
| #88 | .0095 | 1.05 | .0413 | 2.45 | .0965 | #18 | .1695 | 6.30 | .2480 | |||||
| 0.25 | .0098 | #58 | .0420 | #40 | .0980 | 11/64 | .1719 | #E | .2500 | |||||
| #87 | .0100 | #57 | .0430 | 2.50 | .0984 | #17 | .1730 | 1/4 | .2500 | |||||
| #86 | .0105 | 1.10 | .0433 | #39 | .0995 | 4.40 | .1732 | 6.40 | .2520 | |||||
| #85 | .0110 | 1.15 | .0453 | #38 | .1015 | #16 | .1770 | 6.50 | .2559 | |||||
| 0.28 | .0110 | #56 | .0465 | 2.60 | .1024 | 4.50 | .1772 | #F | .2570 | |||||
| #84 | .0115 | 3/64 | .0469 | #37 | .1040 | #15 | .1800 | 6.60 | .2598 | |||||
| 0.30 | .0118 | 1.20 | .0472 | 2.70 | .1063 | 4.60 | .1811 | #G | .2610 | |||||
| #83 | .0120 | 1.25 | .0492 | #36 | .1065 | #14 | .1820 | 6.70 | .2638 | |||||
| #82 | .0125 | 1.30 | .0512 | 2.75 | .1083 | #13 | .1850 | 17/64 | .2656 | |||||
| 0.32 | .0126 | #55 | .0520 | 7/64 | .1094 | 4.70 | .1850 | 6.75 | .2657 | |||||
| #81 | .0130 | 1.35 | .0531 | #35 | .1100 | 4.75 | .1870 | #H | .2660 | |||||
| #80 | .0135 | #54 | .0550 | 2.80 | .1102 | 3/16 | .1875 | 6.80 | .2677 | |||||
| 0.35 | .0138 | 1.40 | .0551 | #34 | .1110 | 4.80 | .1890 | 6.90 | .2717 | |||||
| #79 | .0145 | 1.45 | .0571 | #33 | .1130 | #12 | .1890 | #I | .2720 | |||||
| 1/64 | .0156 | 1.50 | .0591 | 2.90 | .1142 | #11 | .1910 | 7.00 | .2756 | |||||
| 0.40 | .0157 | #53 | .0595 | #32 | .1160 | 4.90 | .1929 | #J | .2770 | |||||
| #78 | .0160 | 1.55 | .0610 | 3.00 | .1181 | #10 | .1935 | 7.10 | .2795 | |||||
| 0.45 | .0177 | 1/16 | .0625 | #31 | .1200 | #9 | .1960 | #K | .2810 | |||||
| #77 | .0180 | 1.60 | .0630 | 3.10 | .1220 | 5.00 | .1969 | 9/32 | .2812 | |||||
| 0.50 | .0197 | #52 | .0635 | 1/8 | .1250 | #8 | .1990 | 7.20 | .2835 | |||||
| #76 | .0200 | 1.65 | .0650 | 3.20 | .1260 | 5.10 | .2008 | 7.25 | .2854 | |||||
| #75 | .0210 | 1.70 | .0669 | 3.15 | .1280 | #7 | .2010 | 7.30 | .2874 | |||||
| 0.55 | .0217 | #51 | .0670 | #30 | .1285 | 13/64 | .2031 | #L | .2900 | |||||
| #74 | .0225 | 1.75 | .0689 | 3.30 | .1299 | #6 | .2040 | 7.40 | .2913 | |||||
| 0.60 | .0236 | #50 | .0700 | 3.40 | .1339 | 5.20 | .2047 | #M | .2950 | |||||
| #73 | .0240 | 1.80 | .0709 | #29 | .1360 | #5 | .2055 | 7.50 | .2953 | |||||
| #72 | .0250 | 1.85 | .0728 | 3.50 | .1378 | 5.25 | .2067 | 19/64 | .2969 | |||||
| 0.65 | .0256 | #49 | .0730 | #28 | .1405 | 5.30 | .2087 | 7.60 | .2992 | |||||
| #71 | .0260 | 1.90 | .0748 | 9/64 | .1406 | #4 | .2090 | #N | .3020 | |||||
| 0.70 | .0276 | #48 | .0760 | 3.60 | .1417 | 5.40 | .2126 | 7.70 | .3031 | |||||
| #70 | .0280 | 1.95 | .0768 | #27 | .1440 | #3 | .2130 | 7.75 | .3051 | |||||
| #69 | .0292 | 5/64 | .0781 | 3.70 | .1457 | 5.50 | .2165 | 7.8 | .3071 | |||||
| 0.75 | .0295 | #47 | .0785 | #26 | .1470 | 7/32 | .2188 | 7.90 | .3110 | |||||
| #68 | .0310 | 2.00 | .0787 | 3.75 | .1476 | 5.6 | .2205 | 5/16 | .3125 | |||||
| 1/32 | .0312 | 2.05 | .0807 | #25 | .1495 | #2 | .2210 | |||||||
The smallest bit I have seen in a good store is a #80 (0.0135) while the table shows down to a #97 (0.0059") and a metric to 0.010 mm (0.00039) Alan Notis has been good enough to send me this link http://www.madison.k12.wi.us/toki/codrills.htm which shows sizes down to 107 0.0019 and this site http://www.ukam.com/micro_core_drills.htm with diamond bits down to 0.001 which are to be spun at 150,000 rpm or MORE and have a feed rate of 0.010" per minute or 1" in 100 minutes. 2004-06-28