Drill Sizes

A progressive list with smallest at top of top left column.
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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)
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