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

Drill Bit Diameter Chart with Standard Depth Ring Colors

The chart below lists the diameters of commonly available cutters. The ring color represents the color of the depth setting ring found on 1/8" shank drill bits (with rings @ 0.800").


Drill Size Decimal Inch MM Ring Color Part Number
0.05mm 0.0020" 0.05mm
104 0.0031" 0.08mm
103 0.0035" 0.09mm
0.10mm & 102 0.0039" 0.10mm
101 0.0043" 0.11mm
100 0.0047" 0.12mm
0.13mm & 99 0.0051" 0.13mm
98 0.0055" 0.14mm
0.15mm & 97 0.0059" 0.15mm DC208-M015-012D
96 0.0063" 0.16mm
95 0.0067" 0.17mm
94 0.0071" 0.18mm DC208-0071-015D
93 0.0075" 0.19mm
0.20mm & 92 0.0079" 0.20mm DC208-M020-015D
91 0.0083" 0.21mm DC208-0083-010D
90 0.0087" 0.22mm DC208-0087-010D
89 0.0091" 0.23mm
88 0.0095" 0.24mm DC208-0095-015D
0.25mm 0.0098" 0.25mm DC208-M025-015D
87 0.0100" 0.25mm DC208-M025-015D (0.25mm)
86 0.0105" 0.27mm DC208-0105-022D
85 0.0110" 0.28mm DC208-0110-015D
84 0.0115" 0.29mm DC208-M030-023D (0.30mm)
0.30mm 0.0118" 0.30mm DC208-M030-023D
83 0.0120" 0.30mm DC208-M030-023D (0.30mm)
82 0.0125" 0.32mm DC208-0125-028D
81 0.0130" 0.33mm DC208-0130-023D
80 0.0135" 0.34mm DC208-0135-022D
0.35mm 0.0138" 0.35mm DC208-M035-022D
79 0.0145" 0.37mm DC208-0145-022D
1/64" 0.0150" 0.40mm 0000-160
0.40mm 0.0157" 0.40mm DC208-M040-022D
78 0.0160" 0.41mm DC208-0160-030D
0.45mm 0.0177" 0.45mm M0.6x0.15 DC208-M045-022D
77 0.0180" 0.46mm DC208-0180-031D
0.50mm 0.0197" 0.50mm DC208-M050-036D
76 0.0200" 0.51mm DC208-0200-036D
75 0.0210" 0.53mm DC208-0210-036D
0.55mm 0.0217" 0.55mm DC208-M055-036D
74 0.0225" 0.57mm DC208-0225-036D
0.60mm 0.0236" 0.60mm M0.8x0.20 DC208-M060-036D
73 0.0240" 0.61mm 0000-160 DC208-0240-040D
72 0.0250" 0.64mm DC208-0250-040D
0.65mm 0.0256" 0.65mm DC208-M065-040D
71 0.0260" 0.66mm 000-120 DC208-0260-040D
0.70mm 0.0276" 0.70mm DC208-M070-040D
70 0.0280" 0.71mm DC208-0280-040D
69 0.0292" 0.74mm DC208-0292-040D
0.75mm 0.0295" 0.75mm M1x0.25 DC208-M075-040D
68 0.0310" 0.79mm DC208-0310-040D
1/32" 0.0313" 0.79mm DC208-M080-040D (0.80mm)
0.80mm 0.0315" 0.80mm DC208-M080-040D
67 0.0320" 0.81mm DC208-0320-040D
66 0.0330" 0.84mm DC208-0330-040D
0.85mm 0.0335" 0.85mm DC208-M085-040D
65 0.0350" 0.89mm 00-90 DC208-0350-040D
0.90mm 0.0354" 0.90mm DC208-M090-040D
64 0.0360" 0.91mm DC208-0360-040D
63 0.0370" 0.94mm 000-120 DC208-0370-040D
0.95mm 0.0374" 0.95mm M1.2x0.25 DC208-M095-040D
62 0.0380" 0.97mm DC208-0380-040D
61 0.0390" 0.99mm DC208-0390-040D
1.00mm 0.0394" 1.00mm DC208-M100-040D
60 0.0400" 1.02mm DC208-0400-040D
59 0.0410" 1.04mm DC208-0410-040D
1.05mm 0.0413" 1.05mm DC208-M105-040D
58 0.0420" 1.07mm DC208-0420-040D
57 0.0430" 1.09mm DC208-0430-040D
1.10mm 0.0433" 1.10mm M1.4x0.30 DC208-M110-040D
1.15mm 0.0453" 1.15mm M1.5x0.35 DC208-0465-040D (#56)
56 0.0465" 1.18mm DC208-0465-040D
3/64" 0.0469" 1.19mm 0-80 DC208-M120-040D (1.20mm)
1.20mm 0.0472" 1.20mm DC208-M120-040D
1.25mm 0.0492" 1.25mm M1.6x0.35 DC208-M125-040D
1.30mm 0.0512" 1.30mm DC208-M130-040D
55 0.0520" 1.32mm 00-90 DC208-0520-040D
1.35mm 0.0531" 1.35mm M1.7x0.35 DC208-M135-040D
54 0.0550" 1.40mm DC208-0550-040D
1.40mm 0.0551" 1.40mm DC208-M140-040D
1.45mm 0.0571" 1.45mm M1.8x0.35 DC208-M145-040D
1.50mm 0.0591" 1.50mm DC208-M150-040D
53 0.0595" 1.51mm 1-64, 1-72 DC208-0595-040D
1.55mm 0.0610" 1.55mm M2x0.45 DC208-M155-040D
1/16" 0.0625" 1.59mm DC208-0625-040D
1.60mm 0.0630" 1.60mm M2x0.4 DC208-M160-040D
52 0.0635" 1.61mm 0-80 DC208-0635-040D
1.65mm 0.0650" 1.65mm DC208-M165-040D
1.70mm 0.0669" 1.70mm DC208-0670-040D (#51)
51 0.0670" 1.70mm DC208-0670-040D
1.75mm 0.0689" 1.75mm M2.2x0.45 DC208-M175-040D
50 0.0700" 1.78mm 2-56, 2-64 0-80 DC208-0700-040D
1.80mm 0.0709" 1.80mm DC208-M180-040D
1.85mm 0.0728" 1.85mm DC208-M185-040D
49 0.0730" 1.85mm DC208-0730-040D
1.90mm 0.0748" 1.90mm DC208-M190-040D
48 0.0760" 1.93mm 1-64, 1-72 DC208-0760-040D
1.95mm 0.0768" 1.95mm DC208-M195-040D
5/64" 0.0781" 1.98mm DC208-0785-040D (#47)
47 0.0785" 1.99mm 3-48 DC208-0785-040D
2.00mm 0.0787" 2.00mm DC208-M200-040D
2.05mm 0.0807" 2.05mm M2.5x0.45 DC208-M205-040D
46 0.0810" 2.06mm 1-64, 1-72 DC208-0810-040D
45 0.0820" 2.08mm 3-56 DC208-0820-040D
2.10mm 0.0827" 2.10mm DC208-M210-040D
2.15mm 0.0846" 2.15mm M2.5x0.35 DC208-M215-040D
44 0.0860" 2.18mm 4-36 DC208-0860-040D
2.20mm 0.0866" 2.20mm DC208-M220-040D
2.25mm 0.0886" 2.25mm DC208-M225-040D
43 0.0890" 2.26mm 4-40 2-56, 2-64 DC208-0890-040D
2.30mm 0.0906" 2.30mm DC208-M230-040D
2.35mm 0.0925" 2.35mm DC208-M235-040D
42 0.0935" 2.37mm 4-48 DC208-0935-040D
3/32" 0.0938" 2.38mm DC208-0938-040D
2.40mm 0.0945" 2.40mm M3x0.60 DC208-M240-040D
41 0.0960" 2.44mm 2-56, 2-64 DC208-0960-040D
2.45mm 0.0965" 2.45mm DC208-M245-040D
40 0.0980" 2.49mm DC208-0980-040D
2.50mm 0.0984" 2.50mm M3x0.5 DC208-M250-040D
39 0.0995" 2.53mm DC208-0995-040D
2.55mm 0.1004" 2.55mm DC208-M255-040D
38 0.1015" 2.58mm 5-40 DC208-1015-040D
2.60mm 0.1024" 2.60mm DC208-M260-040D
37 0.1040" 2.64mm 5-44 3-48, 3-56 DC208-1040-040D
2.65mm 0.1043" 2.65mm DC208-M265-040D
2.70mm 0.1063" 2.70mm DC208-M270-040D
36 0.1065" 2.71mm 6-32 DC208-1065-040D
2.75mm 0.1083" 2.75mm DC208-M275-040D
7/64" 0.1094" 2.78mm DC208-1094-040D
35 0.1100" 2.79mm 3-48, 3-56 DC208-1100-040D
2.80mm 0.1102" 2.80mm DC208-M280-040D
34 0.1110" 2.82mm DC208-1110-040D
2.85mm 0.1122" 2.85mm DC208-M285-040D
33 0.1130" 2.87mm 6-40 DC208-1130-040D
2.90mm 0.1142" 2.90mm M3.5x0.6 DC208-M290-040D
32 0.1160" 2.95mm 4-36, 4-40, 4-48 DC208-1160-040D
2.95mm 0.1161" 2.95mm DC208-M295-040D
3.00mm 0.1181" 3.00mm DC208-M300-040D
31 0.1200" 3.05mm DC208-1200-040D
3.05mm 0.1201" 3.05mm DC208-1200-040D (#31)
3.10mm 0.1220" 3.10mm DC208-M310-040D
3.15mm 0.1240" 3.15mm DC208-M315-040D
1/8" 0.1250" 3.18mm DC208-1250-040D
3.20mm 0.1260" 3.20mm DC208-M320-050D
3.25mm 0.1280" 3.25mm M4x0.75 DC208-1285-050D (#30)
30 0.1285" 3.26mm 5-40, 5-44 4-36, 4-40, 4-48 DC208-1285-050D
3.30mm 0.1299" 3.30mm M4x0.7 DC208-M330-050D
3.35mm 0.1319" 3.35mm DC208-M335-050D
3.40mm 0.1339" 3.40mm DC208-M340-050D
3.45mm 0.1358" 3.45mm DC208-M345-050D
29 0.1360" 3.45mm 8-32, 8-36 5-40, 5-44 DC208-1360-050D
3.50mm 0.1378" 3.50mm M4x0.5 DC208-M350-050D
3.55mm 0.1398" 3.55mm
28 0.1405" 3.57mm DC208-1405-050D
9/64" 0.1406" 3.57mm DC208-1405-050D (#28)
3.60mm 0.1417" 3.60mm DC208-M360-050D
3.65mm 0.1437" 3.65mm DC208-1440-050D (#27)
27 0.1440" 3.66mm 6-32, 6-40 DC208-1440-050D
3.70mm 0.1457" 3.70mm DC208-M370-050D
26 0.1470" 3.73mm DC208-1470-050D
3.75mm 0.1476" 3.75mm M4.5x0.75
25 0.1495" 3.80mm 10-24 6-32, 6-40 DC208-1495-050D
3.80mm 0.1496" 3.80mm DC208-M380-050D
3.85mm 0.1516" 3.85mm DC208-1520-050D (#24)
24 0.1520" 3.86mm DC208-1520-050D
3.90mm 0.1535" 3.90mm DC208-M390-050D
23 0.1540" 3.91mm DC208-1540-050D
3.95mm 0.1555" 3.95mm
5/32" 0.1563" 3.97mm DC208-1563-050D
22 0.1570" 3.99mm DC208-1570-050D
4.00mm 0.1575" 4.00mm M5x1.00 DC208-1570-050D (#22)
21 0.1590" 4.04mm 10-32 DC208-M405-050D (4.05mm)
4.05mm 0.1594" 4.05mm DC208-M405-050D
20 0.1610" 4.09mm DC208-1612-050D
4.10mm 0.1614" 4.10mm M4x0.90 DC208-M410-050D
4.15mm 0.1634" 4.15mm DC208-M415-050D
4.20mm 0.1654" 4.20mm M5x0.8 DC208-M420-050D
19 0.1660" 4.22mm DC208-1660-050D
4.25mm 0.1673" 4.25mm DC208-M425-050D
4.30mm 0.1693" 4.30mm DC208-M430-050D
18 0.1695" 4.31mm 8-32, 8-36 DC208-M430-050D (4.30mm)
4.35mm 0.1713" 4.35mm
11/64" 0.1719" 4.37mm
17 0.1730" 4.39mm DC208-M440-050D (4.40mm)
4.40mm 0.1732" 4.40mm DC208-M440-050D
4.45mm 0.1752" 4.45mm
16 0.1770" 4.50mm 12-24 8-32, 8-36 DC208-M450-050D (4.50mm)
4.50mm 0.1772" 4.50mm DC208-M450-050D
4.55mm 0.1791" 4.55mm
15 0.1800" 4.57mm DC208-1800-050D
4.60mm 0.1811" 4.60mm
14 0.1820" 4.62mm 12-28 DC208-1820-050D
4.65mm 0.1831" 4.65mm
4.70mm & 13 0.1850" 4.70mm DC208-1850-050D
4.75mm 0.1870" 4.75mm DC208-M475-050D
3/16" 0.1875" 4.76mm DC208-1875-050D
4.80mm & 12 0.1890" 4.80mm DC208-1890-050D
4.85mm 0.1909" 4.85mm DC208-M485-050D
11 0.1910" 4.85mm DC208-M485-050D (4.85mm)
4.90mm 0.1929" 4.90mm
10 0.1935" 4.91mm 14-20
4.95mm 0.1949" 4.95mm DC208-M495-050D
9 0.1960" 4.98mm 10-24, 10-32 DC208-1960-050D
5.00mm 0.1969" 5.00mm M6x1.0 DC208-M500-050D
5.05mm 0.1988" 5.05mm DC208-1990-050D (#8)
8 0.1990" 5.05mm DC208-1990-050D
5.10mm 0.2008" 5.10mm DC208-M510-050D
7 0.2010" 5.11mm 1/4-20, 14-24 10-24, 10-32 DC208-2010-050D
5.15mm 0.2028" 5.15mm DC208-M515-050D
13/64" 0.2031" 5.16mm DC208-M515-050D (5.15mm)
6 0.2040" 5.18mm
5.20mm 0.2047" 5.20mm DC208-M520-050D
5 0.2055" 5.22mm
5.25mm 0.2067" 5.25mm M6x0.75
5.30mm 0.2087" 5.30mm DC208-2090-050D (#4)
4 0.2090" 5.31mm DC208-2090-050D
5.35mm 0.2106" 5.35mm
5.40mm 0.2126" 5.40mm
3 0.2130" 5.41mm 1/4-28
5.45mm 0.2146" 5.45mm
5.50mm 0.2165" 5.50mm DC208-M550-050D
5.55mm 0.2185" 5.55mm DC208-M555-050D
7/32" 0.2188" 5.56mm 1/4-32 DC208-M555-050D (5.55mm)
5.60mm 0.2205" 5.60mm DC208-2210-050D (#2)
2 0.2210" 5.61mm 12-24, 12-28 DC208-2210-050D
5.65mm 0.2224" 5.65mm
5.70mm 0.2244" 5.70mm
5.75mm 0.2264" 5.75mm
1 0.2280" 5.79mm 12-24, 12-28 DC208-2280-050D
5.80mm 0.2283" 5.80mm DC208-2280-050D (#1)
5.85mm 0.2303" 5.85mm
5.90mm 0.2323" 5.90mm
A 0.2340" 5.94mm DC208-2340-050D
5.95mm 0.2343" 5.95mm DC208-M595-050D
15/64" 0.2344" 5.95mm
6.00mm 0.2362" 6.00mm M7x1.0 DC208-M600-050D
B 0.2380" 6.05mm
6.05mm 0.2382" 6.05mm
6.10mm 0.2402" 6.10mm DC208-M610-050D
C 0.2420" 6.15mm DC208-2420-050D
6.15mm 0.2421" 6.15mm DC208-2420-050D (C)
6.20mm 0.2441" 6.20mm
D 0.2460" 6.25mm 14-20, 14-24 DC208-2460-050D
6.25mm 0.2461" 6.25mm M7x0.75 DC208-2460-050D (D)
6.30mm 0.2480" 6.30mm
6.35mm, 1/4", & E 0.2500" 6.35mm DC208-2500-050D
6.40mm 0.2520" 6.40mm
6.50mm 0.2559" 6.50mm M7x0.5
F 0.2570" 6.53mm 5/16-18 1/4-20, 1/4-28 14-20, 14-24 DC208-2570-050D
6.60mm 0.2598" 6.60mm
G 0.2610" 6.63mm DC208-2610-050D
6.70mm 0.2638" 6.70mm
17/64" 0.2656" 6.75mm
H 0.2660" 6.76mm 1/4-20, 1/4-28, 1/4-32
6.80mm 0.2677" 6.80mm M8x1.25
6.90mm 0.2717" 6.90mm
I 0.2720" 6.91mm 5/16-24
7.00mm 0.2756" 7.00mm M8x1.0
J 0.2770" 7.04mm
7.10mm 0.2795" 7.10mm
K 0.2810" 7.14mm
9/32" 0.2813" 7.14mm 5/16-32
7.20mm 0.2835" 7.20mm
7.30mm 0.2874" 7.30mm
L 0.2900" 7.37mm
7.40mm 0.2913" 7.40mm
M 0.2950" 7.49mm
7.50mm 0.2953" 7.50mm
19/64" 0.2969" 7.54mm
7.60mm 0.2992" 7.60mm
N 0.3020" 7.67mm
7.70mm 0.3032" 7.70mm
7.80mm 0.3071" 7.80mm M9x1.25
7.90mm 0.3110" 7.90mm
5/16" 0.3125" 7.94mm 3/8-16
8.00mm 0.3150" 8.00mm M9x1.00
O 0.3160" 8.03mm
8.10mm 0.3189" 8.10mm
8.20mm 0.3228" 8.20mm
P 0.3230" 8.20mm 5/16-18, 5/16-24
8.30mm 0.3268" 8.30mm
21/64" 0.3281" 8.33mm
8.40mm 0.3307" 8.40mm
Q 0.3320" 8.43mm 3/8-24 5/16-18, 5/16-24
8.50mm 0.3345" 8.50mm M10x1.5
8.60mm 0.3386" 8.60mm
R 0.3390" 8.61mm
8.70mm 0.3425" 8.70mm
11/32" 0.3438" 8.73mm
8.80mm 0.3465" 8.80mm M10x1.25
S 0.3480" 8.84mm
8.90mm 0.3504" 8.90mm
9.00mm 0.3543" 9.00mm M10x1.00
T 0.3580" 9.09mm
9.10mm 0.3583" 9.10mm
23/64" 0.3594" 9.13mm
9.20mm 0.3622" 9.20mm
9.30mm 0.3661" 9.30mm
U 0.3680" 9.35mm 7/16-14
9.40mm 0.3701" 9.40mm
9.50mm 0.3740" 9.50mm M11x1.50
3/8" 0.3750" 9.53mm
V 0.3770" 9.58mm
9.60mm 0.3780" 9.60mm
9.70mm 0.3819" 9.70mm
9.80mm 0.3858" 9.80mm
W 0.3860" 9.80mm 3/8-16, 3/8-24
9.90mm 0.3898" 9.90mm
25/64" 0.3906" 9.92mm 7/16-20
10.00mm 0.3937" 10.00mm
X 0.3970" 10.08mm 3/8-16, 3/8-24
10.10mm 0.3976" 10.10mm
10.20mm 0.4016" 10.20mm M12x1.75
Y 0.4040" 10.26mm
10.30mm 0.4055" 10.30mm
13/32" 0.4063" 10.32mm 7/16-40
10.40mm 0.4094" 10.40mm
Z 0.4130" 10.49mm
10.50mm 0.4134" 10.50mm M12x1.50
10.60mm 0.4173" 10.60mm
10.70mm 0.4213" 10.70mm
27/64" 0.4219" 10.72mm 1/2-13
10.80mm 0.4252" 10.80mm M12x1.25
10.90mm 0.4291" 10.90mm
11.00mm 0.4331" 11.00mm M12x1.0
11.10mm 0.4370" 11.10mm
7/16" 0.4375" 11.11mm
11.20mm 0.4409" 11.20mm
11.30mm 0.4449" 11.30mm
11.40mm 0.4488" 11.40mm
11.50mm 0.4528" 11.50mm
29/64" 0.4531" 11.51mm 1/2-20 7/16-14, 7/16-20
11.60mm 0.4567" 11.60mm
11.70mm 0.4606" 11.70mm
11.80mm 0.4645" 11.80mm
11.90mm 0.4685" 11.90mm
15/32" 0.4688" 11.91mm 9/16-12 7/16-14, 7/16-20
12.00mm 0.4724" 12.00mm M14x2
12.10mm 0.4764" 12.10mm
12.20mm 0.4803" 12.20mm
12.30mm 0.4843" 12.30mm
31/64" 0.4844" 12.30mm 9/16-12
12.40mm 0.4882" 12.40mm
12.50mm 0.4921" 12.50mm M14x1.5
12.60mm 0.4961" 12.60mm
1/2" & 12.70mm 0.5000" 12.70mm 9/16-18