Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides

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Drill Bit Diameter Chart with Standard Depth Ring Colors

The chart below lists the diameters of commonly available cutters.  The color of each size represents the color of the depth setting ring found on 1/8 in. shank solid carbide drill bits.

Drill Size Decimal Inch   Drill Size Decimal Inch   Drill Size Decimal Inch   Drill Size Decimal Inch
0.05 mm 0.0020" 1.10 mm 0.0433" 2.85 mm 0.1122" 4.75 mm 0.1870"
0.10 mm 0.0040" 1.15 mm 0.0453" 33 0.1130" 3/16" 0.1875"
0.13 mm 0.0050" 56 0.0465" 2.90 mm 0.1142" 4.80 mm & 12 0.1890"
0.15 mm & 97 0.0059" 1.20 mm 0.0472" 32 0.1160" 4.85 mm 0.1909"
96 0.0063" 1.25 mm 0.0492" 2.95 mm 0.1161" 11 0.1910"
95 0.0067" 1.30 mm 0.0512" 3.00 mm 0.1181" 4.90 mm 0.1929"
94 0.0071" 55 0.0520" 31 0.1200" 10 0.1935"
93 0.0075" 1.35 mm 0.0531" 3.05 mm 0.1201" 4.95 mm 0.1949"
0.20 mm & 92 0.0079" 54 0.0550" 3.10 mm 0.1220" 9 0.1960"
91 0.0083" 1.40 mm 0.0551" 3.15 mm 0.1240" 5.00 mm 0.1968"
90 0.0087" 1.45 mm 0.0571" 1/8" 0.1250" 5.05 mm 0.1988"
89 0.0091" 1.50 mm 0.0591" 3.20 mm 0.1260" 8 0.1990"
88 0.0095" 53 0.0595" 3.25 mm 0.1280" 5.10 mm 0.2008"
0.25 mm 0.0098" 1.55 mm 0.0610" 30 0.1285" 7 0.2010"
87 0.0100" 1/16" 0.0625" 3.30 mm 0.1299" 5.15 mm 0.2028"
86 0.0105" 1.60 mm 0.0630" 3.35 mm 0.1319" 6 0.2040"
85 0.0110" 52 0.0635" 3.40 mm 0.1339" 5.20 mm 0.2047"
84 0.0115" 1.65 mm 0.0650" 3.45 mm 0.1358" 5 0.2055"
0.30 mm 0.0118" 1.70 mm 0.0669" 29 0.1360" 5.25 mm 0.2067"
83 0.0120" 51 0.0670" 3.50 mm 0.1378" 5.30 mm 0.2087"
82 0.0125" 1.75 mm 0.0689" 3.55 mm 0.1398" 4 0.2090"
81 0.0130" 50 0.0700" 28 0.1405" 5.35 mm 0.2106"
80 0.0135" 1.80 mm 0.0709" 3.60 mm 0.1417" 5.40 mm 0.2126"
0.35 mm 0.0138" 1.85 mm 0.0728" 3.65 mm 0.1437" 3 0.2130"
79 0.0145" 49 0.0730" 27 0.1440" 5.45 mm 0.2146"
0.40 mm 0.0157" 1.90 mm 0.0748" 3.70 mm 0.1457" 5.50 mm 0.2165"
78 0.0160" 48 0.0760" 26 0.1470" 5.55 mm 0.2185"
0.45 mm 0.0177" 1.95 mm 0.0768" 3.75 mm 0.1476" 5.60 mm 0.2205"
77 0.0180" 47 0.0785" 25 0.1495" 2 0.2210"
0.50 mm 0.0197" 2.00 mm 0.0787" 3.80 mm 0.1496" 5.65 mm 0.2224"
76 0.0200" 2.05 mm 0.0807" 3.85 mm 0.1516" 5.70 mm 0.2244"
75 0.0210" 46 0.0810" 24 0.1520" 5.75 mm 0.2264"
0.55 mm 0.0217" 45 0.0820" 3.90 mm 0.1535" 1 0.2280"
74 0.0225" 2.10 mm 0.0827" 23 0.1540" 5.80 mm 0.2283"
0.60 mm 0.0236" 2.15 mm 0.0846" 3.95 mm 0.1555" 5.85 mm 0.2302"
73 0.0240" 44 0.0860" 5/32" 0.1562" 5.90 mm 0.2323"
72 0.0250" 2.20 mm 0.0866" 22 0.1570" 5.95 mm 0.2343"
0.65 mm 0.0256" 2.25 mm 0.0886" 4.00 mm 0.1575" 6.00 mm 0.2362"
71 0.0260" 43 0.0890" 21 0.1590" 6.05 mm 0.2382"
0.70 mm 0.0276" 2.30 mm 0.0906" 4.05 mm 0.1594" 6.10 mm 0.2402"
70 0.0280" 2.35 mm 0.0925" 20 0.1610" 6.15 mm 0.2421"
69 0.0292" 42 0.0935" 4.10 mm 0.1614" 6.20 mm 0.2441"
0.75 mm 0.0295" 3/32" 0.0938" 4.15 mm 0.1634" 6.25 mm 0.2461"
68 0.0310" 2.40 mm 0.0945" 4.20 mm 0.1654" 6.30 mm 0.2480"
0.80 mm 0.0315" 41 0.0960" 19 0.1660" 6.35 mm & E 0.2500"
67 0.0320" 2.45 mm 0.0965" 4.25 mm 0.1673" 6.40 mm 0.2520"
66 0.0330" 40 0.0980" 4.30 mm 0.1693" 6.50 mm 0.2559"
0.85 mm 0.0335" 2.50 mm 0.0984" 18 0.1695" F 0.2570"
65 0.0350" 39 0.0995" 4.35 mm 0.1713" 6.60 mm 0.2598"
0.90 mm 0.0354" 2.55 mm 0.1004" 11/64" 0.1719" 6.70 mm 0.2638"
64 0.0360" 38 0.1015" 17 0.1730"
63 0.0370" 2.60 mm 0.1024" 4.40 mm 0.1732"
0.95 mm 0.0374" 37 0.1040" 4.45 mm 0.1752"
62 0.0380" 2.65 mm 0.1043" 16 0.1770"
61 0.0390" 2.70 mm 0.1063" 4.50 mm

0.1772"

1.00 mm 0.0394" 36 0.1065" 4.55 mm 0.1791"
60 0.0400" 2.75 mm

0.1083"

15 0.1800"
59 0.0410" 7/64" 0.1094" 4.60 mm 0.1811"
1.05 mm 0.0413" 35 0.1100" 14 0.1820"
58 0.0420" 2.80 mm 0.1102" 4.65 mm 0.1831"
57 0.0430" 34 0.1110" 4.70 mm & 13 0.1850"