U.S. jobber length twist "drill bit" sizes
U.S. sizes 100–50
Jobber length drill dimensions: 100–50
Size |
Diameter |
Flute Length |
Overall Length |
U.S. |
Metric (mm) |
inch |
mm |
inch |
inch |
97 |
0.15 |
0.0059 |
0.150 |
3/4 |
1/16 |
96 |
0.16 |
0.0063 |
0.160 |
3/4 |
1/16 |
95 |
0.17 |
0.0067 |
0.170 |
3/4 |
1/16 |
94 |
0.18 |
0.0071 |
0.180 |
3/4 |
1/16 |
93 |
0.20 |
0.0075 |
0.200 |
3/4 |
1/16 |
92 |
0.20 |
0.0079 |
0.200 |
3/4 |
1/16 |
91 |
|
0.0083 |
0.211 |
3/4 |
5/64 |
90 |
0.22 |
0.0087 |
0.221 |
3/4 |
5/64 |
89 |
|
0.0091 |
0.231 |
3/4 |
5/64 |
88 |
|
0.0095 |
0.241 |
3/4 |
5/64 |
|
0.25 |
0.0098 |
0.250 |
3/4 |
5/64 |
87 |
|
0.0100 |
0.254 |
3/4 |
5/64 |
86 |
|
0.0105 |
0.267 |
3/4 |
3/32 |
85 |
0.28 |
0.0110 |
0.280 |
3/4 |
3/32 |
84 |
|
0.0115 |
0.292 |
3/4 |
3/32 |
|
0.30 |
0.0118 |
0.300 |
3/4 |
3/32 |
83 |
|
0.0120 |
0.305 |
3/4 |
3/32 |
82 |
|
0.0125 |
0.138 |
3/4 |
3/32 |
|
0.32 |
0.0126 |
0.320 |
3/4 |
3/32 |
81 |
|
0.0130 |
0.330 |
3/4 |
3/32 |
80 |
|
0.0135 |
0.343 |
3/4 |
1/8 |
|
0.35 |
0.0138 |
0.350 |
3/4 |
1/8 |
79 |
|
0.0145 |
0.368 |
3/4 |
1/8 |
|
0.38 |
0.0150 |
0.380 |
3/4 |
3/16 |
1/64 |
|
0.0156 |
0.396 |
3/4 |
3/16 |
|
0.40 |
0.0157 |
0.400 |
3/4 |
3/16 |
78 |
|
0.0160 |
0.406 |
7/8 |
3/16 |
|
0.42 |
0.0165 |
0.420 |
7/8 |
3/16 |
|
0.45 |
0.0177 |
0.450 |
7/8 |
3/16 |
77 |
|
0.0180 |
0.457 |
7/8 |
3/16 |
|
0.48 |
0.0189 |
0.480 |
7/8 |
3/16 |
|
0.50 |
0.0197 |
0.500 |
7/8 |
3/16 |
76 |
|
0.0200 |
0.508 |
7/8 |
3/16 |
75 |
|
0.0210 |
0.533 |
1 |
1/4 |
|
0.55 |
0.0217 |
0.550 |
1 |
1/4 |
74 |
|
0.0225 |
0.572 |
1 |
1/4 |
|
0.60 |
0.0236 |
0.600 |
1 1/8 |
5/16 |
73 |
|
0.0240 |
0.610 |
1 1/8 |
5/16 |
72 |
|
0.0250 |
0.635 |
1 1/8 |
5/16 |
|
0.65 |
0.0256 |
0.650 |
1 1/4 |
3/8 |
71 |
|
0.0260 |
0.660 |
1 1/4 |
3/8 |
|
0.70 |
0.0276 |
0.700 |
1 1/4 |
3/8 |
70 |
|
0.0280 |
0.711 |
1 1/4 |
3/8 |
69 |
|
0.0292 |
0.742 |
1 3/8 |
1/2 |
|
0.75 |
0.0295 |
0.750 |
1 3/8 |
1/2 |
68 |
|
0.0310 |
0.787 |
1 3/8 |
1/2 |
1/32 |
|
0.0312 |
0.792 |
1 3/8 |
1/2 |
|
0.80 |
0.0315 |
0.800 |
1 3/8 |
1/2 |
67 |
|
0.0320 |
0.813 |
1 3/8 |
1/2 |
66 |
|
0.0330 |
0.838 |
1 3/8 |
1/2 |
|
0.85 |
0.0335 |
0.850 |
1 1/2 |
5/8 |
65 |
|
0.0350 |
0.889 |
1 1/2 |
5/8 |
|
0.90 |
0.0354 |
0.899 |
1 1/2 |
5/8 |
64 |
|
0.0360 |
0.914 |
1 1/2 |
5/8 |
63 |
|
0.0370 |
0.940 |
1 1/2 |
5/8 |
|
0.95 |
0.0374 |
0.950 |
1 1/2 |
5/8 |
62 |
|
0.0380 |
0.965 |
1 1/2 |
5/8 |
61 |
|
0.0390 |
0.991 |
1 5/8 |
11/16 |
|
1.00 |
0.0394 |
1.00 |
1 5/8 |
11/16 |
60 |
|
0.0400 |
1.016 |
1 5/8 |
11/16 |
59 |
|
0.0410 |
1.041 |
1 5/8 |
11/16 |
|
1.05 |
0.0413 |
1.050 |
1 5/8 |
11/16 |
58 |
|
0.0420 |
1.067 |
1 5/8 |
11/16 |
57 |
|
0.0430 |
1.092 |
1 3/4 |
3/4 |
|
1.10 |
0.0433 |
1.100 |
1 3/4 |
3/4 |
|
1.15 |
0.0453 |
1.150 |
1 3/4 |
3/4 |
56 |
|
0.0465 |
1.181 |
1 3/4 |
3/4 |
3/64 |
|
0.0469 |
1.191 |
1 3/4 |
3/4 |
|
1.20 |
0.0472 |
1.200 |
1 7/8 |
7/8 |
|
1.25 |
0.0492 |
1.250 |
1 7/8 |
7/8 |
|
1.30 |
0.0512 |
1.300 |
1 7/8 |
7/8 |
55 |
|
0.0520 |
1.321 |
1 7/8 |
7/8 |
|
1.35 |
0.0531 |
1.350 |
1 7/8 |
7/8 |
54 |
|
0.0550 |
1.397 |
1 7/8 |
7/8 |
|
1.40 |
0.0551 |
1.400 |
17/8 |
7/8 |
|
1.45 |
0.0571 |
1.450 |
1 7/8 |
7/8 |
|
1.50 |
0.0591 |
1.500 |
1 7/8 |
7/8 |
53 |
|
0.0595 |
1.511 |
1 7/8 |
7/8 |
|
1.55 |
0.0610 |
1.550 |
1 7/8 |
7/8 |
1/16 |
|
0.0625 |
1.588 |
1 7/8 |
7/8 |
|
1.60 |
0.0630 |
1.600 |
1 7/8 |
7/8 |
52 |
|
0.0635 |
1.613 |
1 7/8 |
7/8 |
|
1.65 |
0.0650 |
1.650 |
2 |
1 |
|
1.70 |
0.0669 |
1.700 |
2 |
1 |
51 |
|
0.0670 |
1.702 |
2 |
1 |
|
1.75 |
0.0689 |
1.750 |
2 |
1 |
50 |
|
0.0700 |
1.778 |
2 |
1 |
|
1.80 |
0.0709 |
1.800 |
2 |
1 |
|
1.85 |
0.0728 |
1.850 |
2 |
1 |
U.S. sizes 49–0
Jobber length drill dimensions: 49–0
Size |
Diameter |
Flute Length |
Overall Length |
U.S. |
Metric (mm) |
inch |
mm |
inch |
inch |
49 |
|
0.0730 |
1.854 |
2 |
1 |
|
1.90 |
0.0748 |
1.900 |
2 |
1 |
48 |
|
0.0760 |
1.930 |
2 |
1 |
|
1.95 |
0.0768 |
1.950 |
2 |
1 |
5/64 |
|
0.0781 |
1.984 |
2 |
1 |
47 |
|
0.0785 |
1.994 |
2 |
1 |
|
2.00 |
0.0787 |
2.000 |
2 |
1 |
|
2.05 |
0.0807 |
2.050 |
2 1/8 |
1 1/8 |
46 |
|
0.0810 |
2.057 |
2 1/8 |
1 1/8 |
45 |
|
0.0820 |
2.083 |
2 1/8 |
1 1/8 |
|
2.10 |
0.0827 |
2.100 |
2 1/8 |
1 1/8 |
|
2.15 |
0.0846 |
2.150 |
2 1/8 |
1 1/8 |
44 |
|
0.0860 |
2.184 |
2 1/8 |
1 1/8 |
|
2.20 |
0.0866 |
2.200 |
2 1/4 |
1 1/4 |
|
2.25 |
0.0886 |
2.250 |
2 1/4 |
1 1/4 |
43 |
|
0.0890 |
2.261 |
2 1/4 |
1 1/4 |
|
2.30 |
0.0906 |
2.300 |
2 1/4 |
1 1/4 |
|
2.35 |
0.0925 |
2.350 |
2 1/4 |
1 1/4 |
42 |
|
0.0935 |
2.375 |
2 1/4 |
1 1/4 |
3/32 |
|
0.0938 |
2.383 |
2 1/4 |
1 1/4 |
|
2.40 |
0.0945 |
2.400 |
2 3/8 |
1 3/8 |
41 |
|
0.0960 |
2.438 |
2 3/8 |
1 3/8 |
|
2.45 |
0.0965 |
2.450 |
2 3/8 |
1 3/8 |
40 |
|
0.0980 |
2.489 |
2 3/8 |
1 3/8 |
|
2.50 |
0.0984 |
2.500 |
2 3/8 |
1 3/8 |
39 |
|
0.0995 |
2.527 |
2 3/8 |
1 3/8 |
38 |
|
0.1015 |
2.578 |
2 1/2 |
1 7/16 |
|
2.60 |
0.1024 |
2.600 |
2 1/2 |
1 7/16 |
37 |
|
0.1040 |
2.642 |
2 1/2 |
1 7/16 |
|
2.70 |
0.1063 |
2.700 |
2 1/2 |
1 7/16 |
36 |
|
0.1065 |
2.705 |
2 1/2 |
1 7/16 |
7/64 |
|
0.1094 |
2.779 |
2 5/8 |
1 1/2 |
35 |
|
0.1100 |
2.794 |
2 5/8 |
1 1/2 |
|
2.80 |
0.1102 |
2.800 |
2 5/8 |
1 1/2 |
34 |
|
0.1110 |
2.819 |
2 5/8 |
1 1/2 |
33 |
|
0.1130 |
2.870 |
2 5/8 |
1 1/2 |
|
2.90 |
0.1142 |
2.900 |
2 3/4 |
1 5/8 |
32 |
|
0.1160 |
2.946 |
2 3/4 |
1 5/8 |
|
3.00 |
0.1181 |
3.000 |
2 3/4 |
1 5/8 |
31 |
|
0.1200 |
3.048 |
2 3/4 |
1 5/8 |
|
3.10 |
0.1220 |
3.100 |
2 3/4 |
1 5/8 |
1/8 |
|
0.1250 |
3.0175 |
2 3/4 |
1 5/8 |
|
3.20 |
0.1260 |
3.200 |
2 3/4 |
1 5/8 |
30 |
|
0.1285 |
3.264 |
2 3/4 |
1 5/8 |
|
3.30 |
0.1299 |
3.300 |
2 7/8 |
1 3/4 |
|
3.40 |
0.1339 |
3.400 |
2 7/8 |
1 3/4 |
29 |
|
0.1360 |
3.454 |
2 7/8 |
1 3/4 |
|
3.50 |
0.1378 |
3.500 |
2 7/8 |
1 3/4 |
28 |
|
0.1405 |
3.569 |
2 7/8 |
1 3/4 |
9/64 |
|
0.1406 |
3.571 |
2 7/8 |
1 3/4 |
|
3.60 |
0.1417 |
3.600 |
3 |
1 7/8 |
27 |
|
0.1440 |
3.658 |
3 |
1 7/8 |
|
3.70 |
0.1457 |
3.700 |
3 |
1 7/8 |
26 |
|
0.1470 |
3.734 |
3 |
1 7/8 |
25 |
|
0.1495 |
3.797 |
3 |
1 7/8 |
|
3.80 |
0.1496 |
3.800 |
3 |
1 7/8 |
24 |
|
0.1520 |
3.861 |
3 1/8 |
2 |
|
3.90 |
0.1535 |
3.900 |
3 1/8 |
2 |
23 |
|
0.1540 |
3.912 |
3 1/8 |
2 |
5/32 |
|
0.1562 |
3.967 |
3 1/8 |
2 |
22 |
|
0.1570 |
3.988 |
3 1/8 |
2 |
|
4.00 |
0.1575 |
4.000 |
3 1/4 |
2 1/8 |
21 |
|
0.1590 |
4.039 |
3 1/4 |
2 1/8 |
20 |
|
0.1610 |
4.089 |
3 1/4 |
2 1/8 |
|
4.10 |
0.1614 |
4.100 |
3 1/4 |
2 1/8 |
|
4.20 |
0.1654 |
4.200 |
3 1/4 |
2 1/8 |
19 |
|
0.1660 |
4.216 |
3 1/4 |
2 1/8 |
|
4.30 |
0.1693 |
4.300 |
3 1/4 |
2 1/8 |
18 |
|
0.1695 |
4.305 |
3 1/4 |
2 1/8 |
11/64 |
|
0.1719 |
4.366 |
3 1/4 |
2 1/8 |
17 |
|
0.1730 |
4.394 |
3 3/8 |
2 3/16 |
|
4.40 |
0.1732 |
4.400 |
3 3/8 |
2 3/16 |
16 |
|
0.1770 |
4.496 |
3 3/8 |
2 3/16 |
|
4.50 |
0.1772 |
4.500 |
3 3/8 |
2 3/16 |
15 |
|
0.1800 |
4.572 |
3 3/8 |
2 3/16 |
|
4.60 |
0.1811 |
4.600 |
3 3/8 |
2 3/16 |
14 |
|
0.1820 |
4.623 |
3 3/8 |
2 3/16 |
13 |
4.70 |
0.1850 |
4.700 |
3 1/2 |
2 5/16 |
3/16 |
|
0.1875 |
4.762 |
3 1/2 |
2 5/16 |
12 |
4.80 |
0.1890 |
4.800 |
3 1/2 |
2 5/16 |
11 |
|
0.1910 |
4.851 |
3 1/2 |
2 5/16 |
|
4.90 |
0.1929 |
4.900 |
3 5/8 |
2 7/16 |
10 |
|
0.1935 |
4.915 |
3 5/8 |
2 7/16 |
9 |
|
0.1960 |
4.978 |
3 5/8 |
2 7/16 |
|
5.00 |
0.1969 |
5.000 |
3 5/8 |
2 7/16 |
8 |
|
0.1990 |
5.054 |
3 5/8 |
2 7/16 |
|
5.10 |
0.2008 |
5.100 |
3 5/8 |
2 7/16 |
7 |
|
0.2010 |
5.105 |
3 5/8 |
2 7/16 |
13/64 |
|
0.2031 |
5.159 |
3 5/8 |
2 7/16 |
6 |
|
0.2040 |
5.182 |
3 3/4 |
2 1/2 |
|
5.20 |
0.2047 |
5.200 |
3 3/4 |
2 1/2 |
5 |
|
0.2055 |
5.220 |
3 3/4 |
2 1/2 |
|
5.30 |
0.2087 |
5.300 |
3 3/4 |
2 1/2 |
4 |
|
0.2090 |
5.309 |
3 3/4 |
2 1/2 |
|
5.40 |
0.2126 |
5.400 |
3 3/4 |
2 1/2 |
3 |
|
0.2130 |
5.410 |
3 3/4 |
2 1/2 |
|
5.50 |
0.2165 |
5.500 |
3 3/4 |
2 1/2 |
7/32 |
|
0.2188 |
5.558 |
3 3/4 |
2 1/2 |
|
5.60 |
0.2205 |
5.600 |
3 7/8 |
2 5/8 |
2 |
|
0.2210 |
5.613 |
3 7/8 |
2 5/8 |
|
5.70 |
0.2244 |
5.700 |
3 7/8 |
2 5/8 |
1 |
|
0.2280 |
5.791 |
3 7/8 |
2 5/8 |
|
5.80 |
0.2283 |
5.800 |
3 7/8 |
2 5/8 |
|
5.90 |
0.2323 |
5.600 |
3 7/8 |
2 5/8 |
A |
|
0.2340 |
5.944 |
3 7/8 |
2 5/8 |
15/64 |
|
0.2344 |
5.954 |
3 7/8 |
2 5/8 |
|
6.00 |
0.2362 |
6.000 |
4 |
2 3/4 |
B |
|
0.2380 |
6.045 |
4 |
2 3/4 |
|
6.10 |
0.2402 |
6.100 |
4 |
2 3/4 |
C |
|
0.2420 |
6.147 |
4 |
2 3/4 |
|
6.20 |
0.2441 |
6.200 |
4 |
2 3/4 |
D |
|
0.2460 |
6.248 |
4 |
2 3/4 |
|
6.30 |
0.2480 |
6.300 |
4 |
2 3/4 |
E, 1/4 |
|
0.2500 |
6.350 |
4 |
2 3/4 |
|
6.40 |
0.2520 |
6.400 |
4 1/8 |
2 7/8 |
|
6.50 |
0.2559 |
6.500 |
4 1/8 |
2 7/8 |
F |
|
0.2570 |
6.528 |
4 1/8 |
2 7/8 |
|
6.60 |
0.2598 |
6.600 |
4 1/8 |
2 7/8 |
G |
|
0.2610 |
6.629 |
4 1/8 |
2 7/8 |
|
6.70 |
0.2638 |
6.700 |
4 1/8 |
2 7/8 |
17/64 |
|
0.2656 |
6.746 |
4 1/8 |
2 7/8 |
H |
|
0.2660 |
6.756 |
4 1/8 |
2 7/8 |
|
6.80 |
0.2677 |
6.800 |
4 1/8 |
2 7/8 |
|
6.90 |
0.2717 |
6.900 |
4 1/8 |
2 7/8 |
I |
|
0.2720 |
6.909 |
4 1/8 |
2 7/8 |
|
7.00 |
0.2756 |
7.000 |
4 1/8 |
2 7/8 |
J |
|
0.2770 |
7.036 |
4 1/8 |
2 7/8 |
|
7.10 |
0.2795 |
7.100 |
4 1/4 |
2 15/16 |
K |
|
0.2810 |
7.137 |
4 1/4 |
2 15/16 |
9/32 |
|
0.2812 |
7.142 |
4 1/4 |
2 15/16 |
|
7.20 |
0.2835 |
7.200 |
4 1/4 |
2 15/16 |
|
7.30 |
0.2874 |
7.300 |
4 1/4 |
2 15/16 |
L |
|
0.2900 |
7.366 |
4 1/4 |
2 15/16 |
|
7.40 |
0.2913 |
7.400 |
4 3/8 |
3 1/16 |
M |
|
0.2950 |
7.493 |
4 3/8 |
3 1/16 |
|
7.50 |
0.2953 |
7.500 |
4 3/8 |
3 1/16 |
19/64 |
|
0.2969 |
7.541 |
4 3/8 |
3 1/16 |
|
7.60 |
0.2992 |
7.600 |
4 3/8 |
3 1/16 |
N |
|
0.3020 |
7.671 |
4 3/8 |
3 1/16 |
|
7.70 |
0.3031 |
7.700 |
4 1/2 |
3 3/16 |
|
7.80 |
0.3071 |
7.800 |
4 1/2 |
3 3/16 |
|
7.90 |
0.3110 |
7.900 |
4 1/2 |
3 3/16 |
5/16 |
|
0.3125 |
7.938 |
4 1/2 |
3 3/16 |
|
8.00 |
0.3150 |
8.000 |
4 1/2 |
3 3/16 |
O |
|
0.3160 |
8.026 |
4 1/2 |
3 3/16 |
|
8.10 |
0.3189 |
8.100 |
4 5/8 |
3 5/16 |
|
8.20 |
0.3228 |
8.200 |
4 5/8 |
3 5/16 |
P |
|
0.3230 |
8.204 |
4 5/8 |
3 5/16 |
|
8.30 |
0.3268 |
8.300 |
4 5/8 |
3 5/16 |
21/64 |
|
0.3281 |
8.334 |
4 5/8 |
3 5/16 |
|
8.40 |
0.3307 |
8.400 |
4 3/4 |
3 7/16 |
Q |
|
0.3320 |
8.433 |
4 3/4 |
3 7/16 |
|
8.50 |
0.3346 |
8.500 |
4 3/4 |
3 7/16 |
|
8.60 |
0.3386 |
8.600 |
4 3/4 |
3 7/16 |
R |
|
0.3390 |
8.611 |
4 3/4 |
3 7/16 |
|
8.70 |
0.3425 |
8.700 |
4 3/4 |
3 7/16 |
11/32 |
|
0.3438 |
8.733 |
4 3/4 |
3 7/16 |
|
8.80 |
0.3465 |
8.800 |
4 7/8 |
3 1/2 |
S |
|
0.3480 |
8.839 |
4 7/8 |
3 1/2 |
|
8.90 |
0.3504 |
8.900 |
4 7/8 |
3 1/2 |
|
9.00 |
0.3543 |
9.000 |
4 7/8 |
3 1/2 |
T |
|
0.3580 |
9.093 |
4 7/8 |
3 1/2 |
|
9.10 |
0.3583 |
9.100 |
4 7/8 |
3 1/2 |
23/64 |
|
0.3594 |
9.129 |
4 7/8 |
3 1/2 |
|
9.20 |
0.3622 |
9.200 |
5 |
3 5/8 |
|
9.30 |
0.3661 |
9.300 |
5 |
3 5/8 |
U |
|
0.3680 |
9.347 |
5 |
3 5/8 |
|
9.40 |
0.3701 |
9.400 |
5 |
3 5/8 |
|
9.50 |
0.3740 |
9.500 |
5 |
3 5/8 |
3/8 |
|
0.3750 |
9.525 |
5 |
3 5/8 |
V |
|
0.3770 |
9.576 |
5 |
3 5/8 |
|
9.60 |
0.3780 |
9.600 |
5 1/8 |
3 3/4 |
|
9.70 |
0.3819 |
9.700 |
5 1/8 |
3 3/4 |
|
9.80 |
0.3858 |
9.800 |
5 1/8 |
3 3/4 |
W |
|
0.3860 |
9.804 |
5 1/8 |
3 3/4 |
|
9.90 |
0.3898 |
9.900 |
5 1/8 |
3 3/4 |
25/64 |
|
0.3906 |
9.921 |
5 1/8 |
3 3/4 |
|
10.00 |
0.3937 |
10.00 |
5 1/8 |
3 3/4 |
X |
|
0.3970 |
10.084 |
5 1/8 |
3 3/4 |
|
10.20 |
0.4016 |
10.200 |
5 1/4 |
3 7/8 |
Y |
|
0.4040 |
10.262 |
5 1/4 |
3 7/8 |
13/32 |
|
0.4062 |
10.317 |
5 1/4 |
3 7/8 |
Z |
|
0.4130 |
10.490 |
5 1/4 |
3 7/8 |
|
10.50 |
0.4134 |
10.500 |
5 1/4 |
3 7/8 |
27/64 |
|
0.4219 |
10.716 |
5 3/8 |
3 15/16 |
|
10.80 |
0.4252 |
10.800 |
5 1/2 |
4 1/16 |
|
11.00 |
0.4331 |
11.000 |
5 1/2 |
4 1/16 |
7/16 |
|
0.4375 |
11.112 |
5 1/2 |
4 1/16 |
|
11.20 |
0.4409 |
11.200 |
5 5/8 |
4 3/16 |
|
11.50 |
0.4528 |
11.500 |
5 5/8 |
4 3/16 |
29/64 |
|
0.4531 |
11.509 |
5 5/8 |
4 3/16 |
|
11.80 |
0.4646 |
11.800 |
5 3/4 |
4 5/16 |
15/32 |
|
0.4688 |
11.908 |
5 3/4 |
4 5/16 |
|
12.00 |
0.4724 |
12.000 |
5 7/8 |
4 3/8 |
|
12.20 |
0.4803 |
12.200 |
5 7/8 |
4 3/8 |
31/64 |
|
0.4844 |
12.304 |
5 7/8 |
4 3/8 |
|
12.50 |
0.4921 |
12.500 |
6 |
4 1/2 |
1/2 |
|
0.500 |
12.700 |
6 |
4 1/2 |