Prototek Machining Drill Sizes Chart

Decimal Equivalents of Drill Size

This Drill Sizes Chart is for converting and identifying various drill bit sizes. Because of differences in numbering systems, some conversions are approximated but are within .0001 inch. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.

Number sizes
1 .2280 2 .2210 3 .2130 4 .2090 5 .2055 6 .2040 7 .2010 8 .1990 9 .1960 10 .1935 11 .1910 12 .1890 13 .1850 14 .1820 15 .1800 16 .1770 17 .1730 18 .1695 19 .1660 20 .1610 21 .1590 22 .1570 23 .1540 24 .1520 25 .1495 26 .1470 27 .1440 28 .1405 29 .1360 30 .1285 31 .1200 32 .1160 33 .1130 34 .1110 35 .1100 36 .1065 37 .1040 38 .1015 39 .0995 40 0980	41 .0960 42 .0935 43 .0890 44 .0860 45 .0820 46 .0810 47 .0785 48 .0760 49 .0730 50 .0700 51 .0670 52 .0635 53 .0595 54 .0550 55 .0520 56 .0465 57 .0430 58 .0420 59 .0410 60 .0400 61 .0390 62 .0380 63 .0370 64 .0360 65 .0350 66 .0330 67 .0320 68 .0310 69 .0292 70 .0280 71 .0260 72 .0250 73 .0240 74 .0225 75 .0210 76 .0200 77 .0180

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