U.S. screw machine length twist drill size chart
Size | Diameter | Flute Length | Overall Length | ||
---|---|---|---|---|---|
U.S. | Metric (mm) | inch | mm | inch | inch |
1.00 | 0.0394 | 1.00 | 1/2 | 1 3/8 | |
60 | 0.0400 | 1.016 | 1/2 | 1 3/8 | |
59 | 0.0410 | 1.041 | 1/2 | 1 3/8 | |
1.05 | 0.0413 | 1.050 | 1/2 | 1 3/8 | |
58 | 0.0420 | 1.067 | 1/2 | 1 3/8 | |
57 | 0.0430 | 1.092 | 1/2 | 1 3/8 | |
1.10 | 0.0433 | 1.100 | 1/2 | 1 3/8 | |
1.15 | 0.0453 | 1.150 | 1/2 | 1 3/8 | |
56 | 0.0465 | 1.181 | 1/2 | 1 3/8 | |
3/64 | 0.0469 | 1.191 | 1/2 | 1 3/8 | |
1.20 | 0.0472 | 1.200 | 5/8 | 1 5/8 | |
1.25 | 0.0492 | 1.250 | 5/8 | 1 5/8 | |
1.30 | 0.0512 | 1.300 | 5/8 | 1 5/8 | |
55 | 0.0520 | 1.321 | 5/8 | 1 5/8 | |
1.35 | 0.0531 | 1.350 | 5/8 | 1 5/8 | |
54 | 0.0550 | 1.397 | 5/8 | 1 5/8 | |
1.40 | 0.0551 | 1.400 | 5/8 | 1 5/8 | |
1.45 | 0.0571 | 1.450 | 5/8 | 1 5/8 | |
1.50 | 0.0591 | 1.500 | 5/8 | 1 5/8 | |
53 | 0.0595 | 1.511 | 5/8 | 1 5/8 | |
1.55 | 0.0610 | 1.550 | 5/8 | 1 5/8 | |
1/16 | 0.0625 | 1.588 | 5/8 | 1 5/8 | |
1.60 | 0.0630 | 1.600 | 11/16 | 1 11/16 | |
52 | 0.0635 | 1.613 | 11/16 | 1 11/16 | |
1.65 | 0.0650 | 1.650 | 11/16 | 1 11/16 | |
1.70 | 0.0669 | 1.700 | 11/16 | 1 11/16 | |
51 | 0.0670 | 1.702 | 11/16 | 1 11/16 | |
1.75 | 0.0689 | 1.750 | 11/16 | 1 11/16 | |
50 | 0.0700 | 1.778 | 11/16 | 1 11/16 | |
1.80 | 0.0709 | 1.800 | 11/16 | 1 11/16 | |
1.85 | 0.0728 | 1.850 | 11/16 | 1 11/16 | |
49 | 0.0730 | 1.854 | 11/16 | 1 11/16 | |
1.90 | 0.0748 | 1.900 | 11/16 | 1 11/16 | |
48 | 0.0760 | 1.930 | 11/16 | 1 11/16 | |
1.95 | 0.0768 | 1.950 | 11/16 | 1 11/16 | |
5/64 | 0.0781 | 1.984 | 11/16 | 1 11/16 | |
47 | 0.0785 | 1.994 | 11/16 | 1 11/16 | |
2.00 | 0.0787 | 2.000 | 11/16 | 1 11/16 | |
2.05 | 0.0807 | 2.050 | 3/4 | 1 3/4 | |
46 | 0.0810 | 2.057 | 3/4 | 1 3/4 | |
45 | 0.0820 | 2.083 | 3/4 | 1 3/4 | |
2.10 | 0.0827 | 2.100 | 3/4 | 1 3/4 | |
2.15 | 0.0846 | 2.150 | 3/4 | 1 3/4 | |
44 | 0.0860 | 2.184 | 3/4 | 1 3/4 | |
2.20 | 0.0866 | 2.200 | 3/4 | 1 3/4 | |
2.25 | 0.0886 | 2.250 | 3/4 | 1 3/4 | |
43 | 0.0890 | 2.261 | 3/4 | 1 3/4 | |
2.30 | 0.0906 | 2.300 | 3/4 | 1 3/4 | |
2.35 | 0.0925 | 2.350 | 3/4 | 1 3/4 | |
42 | 0.0935 | 2.375 | 3/4 | 1 3/4 | |
3/32 | 0.0938 | 2.383 | 3/4 | 1 3/4 | |
2.40 | 0.0945 | 2 1/2 | 13/16 | 1 13/16 | |
41 | 0.0960 | 2.438 | 13/16 | 1 13/16 | |
2.45 | 0.0965 | 2.450 | 13/16 | 1 13/16 | |
40 | 0.0980 | 2.489 | 13/16 | 1 13/16 | |
2.50 | 0.0984 | 2.500 | 13/16 | 1 13/16 | |
39 | 0.0995 | 2.527 | 13/16 | 1 13/16 | |
38 | 0.1015 | 2.578 | 13/16 | 1 13/16 | |
2.60 | 0.1024 | 2.600 | 13/16 | 1 13/16 | |
37 | 0.1040 | 2.642 | 13/16 | 1 13/16 | |
2.70 | 0.1063 | 2.700 | 13/16 | 1 13/16 | |
36 | 0.1065 | 2.705 | 13/16 | 1 13/16 | |
7/64 | 0.1094 | 2.779 | 13/16 | 1 13/16 | |
35 | 0.1100 | 2.794 | 7/8 | 1 7/8 | |
2.80 | 0.1102 | 2.800 | 7/8 | 1 7/8 | |
34 | 0.1110 | 2.819 | 7/8 | 1 7/8 | |
33 | 0.1130 | 2.870 | 7/8 | 1 7/8 | |
2.90 | 0.1142 | 2.900 | 7/8 | 1 7/8 | |
32 | 0.1160 | 2.946 | 7/8 | 1 7/8 | |
3.00 | 0.1181 | 3.000 | 7/8 | 1 7/8 | |
31 | 0.1200 | 3.048 | 7/8 | 1 7/8 | |
3.10 | 0.1220 | 3.100 | 7/8 | 1 7/8 | |
1/8 | 0.1250 | 3.0175 | 7/8 | 1 7/8 | |
3.20 | 0.1260 | 3.200 | 15/16 | 1 15/16 | |
30 | 0.1285 | 3.264 | 15/16 | 1 15/16 | |
3.30 | 0.1299 | 3.300 | 15/16 | 1 15/16 | |
3.40 | 0.1339 | 3.400 | 15/16 | 5 3/81 15/16 | |
29 | 0.1360 | 3.454 | 15/16 | 1 15/16 | |
3.50 | 0.1378 | 3.500 | 15/16 | 1 15/16 | |
28 | 0.1405 | 3.569 | 15/16 | 1 15/16 | |
9/64 | 0.1406 | 3.571 | 15/16 | 1 15/16 | |
3.60 | 0.1417 | 3.600 | 1 | 2 1/16 | |
27 | 0.1440 | 3.658 | 1 | 2 1/16 | |
3.70 | 0.1457 | 3.700 | 1 | 2 1/16 | |
26 | 0.1470 | 3.734 | 1 | 2 1/16 | |
25 | 0.1495 | 3.797 | 1 | 2 1/16 | |
3.80 | 0.1496 | 3.800 | 1 | 2 1/16 | |
24 | 0.1520 | 3.861 | 1 | 2 1/16 | |
3.90 | 0.1535 | 3.900 | 1 | 2 1/16 | |
23 | 0.1540 | 3.912 | 1 | 2 1/16 | |
5/32 | 0.1562 | 3.967 | 1 | 2 1/16 | |
22 | 0.1570 | 3.988 | 1 1/16 | 2 1/8 | |
4.00 | 0.1575 | 4.000 | 1 1/16 | 2 1/8 | |
21 | 0.1590 | 4.039 | 1 1/16 | 2 1/8 | |
20 | 0.1610 | 4.089 | 1 1/16 | 2 1/8 | |
4.10 | 0.1614 | 4.100 | 1 1/16 | 2 1/8 | |
4.20 | 0.1654 | 4.200 | 1 1/16 | 2 1/8 | |
19 | 0.1660 | 4.216 | 1 1/16 | 2 1/8 | |
4.30 | 0.1693 | 4.300 | 1 1/16 | 2 1/8 | |
18 | 0.1695 | 4.305 | 1 1/16 | 2 1/8 | |
11/64 | 0.1719 | 4.366 | 1 1/16 | 2 1/8 | |
17 | 0.1730 | 4.394 | 1 1/8 | 2 3/16 | |
4.40 | 0.1732 | 4.400 | 1 1/8 | 2 3/16 | |
16 | 0.1770 | 4.496 | 1 1/8 | 2 3/16 | |
4.50 | 0.1772 | 4.500 | 1 1/8 | 2 3/16 | |
15 | 0.1800 | 4.572 | 1 1/8 | 2 3/16 | |
4.60 | 0.1811 | 4.600 | 1 1/8 | 2 3/16 | |
14 | 0.1820 | 4.623 | 1 1/8 | 2 3/16 | |
13 | 4.70 | 0.1850 | 4.700 | 1 1/8 | 2 3/16 |
3/16 | 0.1875 | 4.762 | 1 1/8 | 2 3/16 | |
12 | 4.80 | 0.1890 | 4.800 | 1 3/16 | 2 1/4 |
11 | 0.1910 | 4.851 | 1 3/16 | 2 1/4 | |
4.90 | 0.1929 | 4.900 | 1 3/16 | 2 1/4 | |
10 | 0.1935 | 4.915 | 1 3/16 | 2 1/4 | |
9 | 0.1960 | 4.978 | 1 3/16 | 2 1/4 | |
5.00 | 0.1969 | 5.000 | 1 3/16 | 2 1/4 | |
8 | 0.1990 | 5.054 | 1 3/16 | 2 1/4 | |
5.10 | 0.2008 | 5.100 | 1 3/16 | 2 1/4 | |
7 | 0.2010 | 5.105 | 1 3/16 | 2 1/4 | |
13/64 | 0.2031 | 5.159 | 1 3/16 | 2 1/4 | |
6 | 0.2040 | 5.182 | 1 1/4 | 2 3/8 | |
5.20 | 0.2047 | 5.200 | 1 1/4 | 2 3/8 | |
5 | 0.2055 | 5.220 | 1 1/4 | 2 3/8 | |
5.30 | 0.2087 | 5.300 | 1 1/4 | 2 3/8 | |
4 | 0.2090 | 5.309 | 1 1/4 | 2 3/8 | |
5.40 | 0.2126 | 5.400 | 1 1/4 | 2 3/8 | |
3 | 0.2130 | 5.410 | 1 1/4 | 2 3/8 | |
5.50 | 0.2165 | 5.500 | 1 1/4 | 2 3/8 | |
7/32 | 0.2188 | 5.558 | 1 1/4 | 2 3/8 | |
5.60 | 0.2205 | 5.600 | 1 5/16 | 2 7/16 | |
2 | 0.2210 | 5.613 | 1 5/16 | 2 7/16 | |
5.70 | 0.2244 | 5.700 | 1 5/16 | 2 7/16 | |
1 | 0.2280 | 5.791 | 1 5/16 | 2 7/16 | |
5.80 | 0.2283 | 5.800 | 1 5/16 | 2 7/16 | |
5.90 | 0.2323 | 5.600 | 1 5/16 | 2 7/16 | |
A | 0.2340 | 5.944 | 1 5/16 | 2 7/16 | |
15/64 | 0.2344 | 5.954 | 1 5/16 | 2 7/16 | |
6.00 | 0.2362 | 6.000 | 1 3/8 | 2 1/2 | |
B | 0.2380 | 6.045 | 1 3/8 | 2 1/2 | |
6.10 | 0.2402 | 6.100 | 1 3/8 | 2 1/2 | |
C | 0.2420 | 6.147 | 1 3/8 | 2 1/2 | |
6.20 | 0.2441 | 6.200 | 1 3/8 | 2 1/2 | |
D | 0.2460 | 6.248 | 1 3/8 | 2 1/2 | |
6.30 | 0.2480 | 6.300 | 1 3/8 | 2 1/2 | |
E, 1/4 | 0.2500 | 6.350 | 1 3/8 | 2 1/2 | |
6.40 | 0.2520 | 6.400 | 1 7/16 | 2 5/8 | |
6.50 | 0.2559 | 6.500 | 1 7/16 | 2 5/8 | |
F | 0.2570 | 6.528 | 1 7/16 | 2 5/8 | |
6.60 | 0.2598 | 6.600 | 1 7/16 | 2 5/8 | |
G | 0.2610 | 6.629 | 1 7/16 | 2 5/8 | |
6.70 | 0.2638 | 6.700 | 1 7/16 | 2 5/8 | |
17/64 | 0.2656 | 6.746 | 1 7/16 | 2 5/8 | |
H | 0.2660 | 6.756 | 1 1/2 | 2 11/16 | |
6.80 | 0.2677 | 6.800 | 1 1/2 | 2 11/16 | |
6.90 | 0.2717 | 6.900 | 1 1/2 | 2 11/16 | |
I | 0.2720 | 6.909 | 1 1/2 | 2 11/16 | |
7.00 | 0.2756 | 7.000 | 1 1/2 | 2 11/16 | |
J | 0.2770 | 7.036 | 1 1/2 | 2 11/16 | |
7.10 | 0.2795 | 7.100 | 1 1/2 | 2 11/16 | |
K | 0.2810 | 7.137 | 1 1/2 | 2 11/16 | |
9/32 | 0.2812 | 7.142 | 1 1/2 | 2 11/16 | |
7.20 | 0.2835 | 7.200 | 1 9/16 | 2 3/4 | |
7.30 | 0.2874 | 7.300 | 1 9/16 | 2 3/4 | |
L | 0.2900 | 7.366 | 1 9/16 | 2 3/4 | |
7.40 | 0.2913 | 7.400 | 1 9/16 | 2 3/4 | |
M | 0.2950 | 7.493 | 1 9/16 | 2 3/4 | |
7.50 | 0.2953 | 7.500 | 1 9/16 | 2 3/4 | |
19/64 | 0.2969 | 7.541 | 1 9/16 | 2 3/4 | |
7.60 | 0.2992 | 7.600 | 1 5/8 | 2 13/16 | |
N | 0.3020 | 7.671 | 1 5/8 | 2 13/16 | |
7.70 | 0.3031 | 7.700 | 1 5/8 | 2 13/16 | |
7.80 | 0.3071 | 7.800 | 1 5/8 | 2 13/16 | |
7.90 | 0.3110 | 7.900 | 1 5/8 | 2 13/16 | |
5/16 | 0.3125 | 7.938 | 1 5/8 | 2 13/16 | |
8.00 | 0.3150 | 8.000 | 1 11/16 | 2 15/16 | |
O | 0.3160 | 8.026 | 1 11/16 | 2 15/16 | |
8.10 | 0.3189 | 8.100 | 1 11/16 | 2 15/16 | |
8.20 | 0.3228 | 8.200 | 1 11/16 | 2 15/16 | |
P | 0.3230 | 8.204 | 1 11/16 | 2 15/16 | |
8.30 | 0.3268 | 8.300 | 1 11/16 | 2 15/16 | |
21/64 | 0.3281 | 8.334 | 1 11/16 | 2 15/16 | |
8.40 | 0.3307 | 8.400 | 1 11/16 | 3 | |
Q | 0.3320 | 8.433 | 1 11/16 | 3 | |
8.50 | 0.3346 | 8.500 | 1 11/16 | 3 | |
8.60 | 0.3386 | 8.600 | 1 11/16 | 3 | |
R | 0.3390 | 8.611 | 1 11/16 | 3 | |
8.70 | 0.3425 | 8.700 | 1 11/16 | 3 | |
11/32 | 0.3438 | 8.733 | 1 11/16 | 3 | |
8.80 | 0.3465 | 8.800 | 1 3/4 | 3 1/16 | |
S | 0.3480 | 8.839 | 1 3/4 | 3 1/16 | |
8.90 | 0.3504 | 8.900 | 1 3/4 | 3 1/16 | |
9.00 | 0.3543 | 9.000 | 1 3/4 | 1/16 | |
T | 0.3580 | 9.093 | 1 3/4 | 3 1/16 | |
9.10 | 0.3583 | 9.100 | 1 3/4 | 3 1/16 | |
23/64 | 0.3594 | 9.129 | 1 3/4 | 3 1/16 | |
9.20 | 0.3622 | 9.200 | 1 13/16 | 3 1/8 | |
9.30 | 0.3661 | 9.300 | 1 13/16 | 3 1/8 | |
U | 0.3680 | 9.347 | 1 13/16 | 3 1/8 | |
9.40 | 0.3701 | 9.400 | 1 13/16 | 3 1/8 | |
9.50 | 0.3740 | 9.500 | 1 13/16 | 3 1/8 | |
3/8 | 0.3750 | 9.525 | 1 13/16 | 3 1/8 | |
V | 0.3770 | 9.576 | 1 7/8 | 3 1/4 | |
9.60 | 0.3780 | 9.600 | 1 7/8 | 3 1/4 | |
9.70 | 0.3819 | 9.700 | 1 7/8 | 3 1/4 | |
9.80 | 0.3858 | 9.800 | 1 7/8 | 3 1/4 | |
W | 0.3860 | 9.804 | 1 7/8 | 3 1/4 | |
9.90 | 0.3898 | 9.900 | 1 7/8 | 3 1/4 | |
25/64 | 0.3906 | 9.921 | 1 7/8 | 3 1/4 | |
10.00 | 0.3937 | 10.00 | 1 15/16 | 3 5/16 | |
X | 0.3970 | 10.084 | 1 15/16 | 3 5/16 | |
10.20 | 0.4016 | 10.200 | 1 15/16 | 3 5/16 | |
Y | 0.4040 | 10.262 | 1 15/16 | 3 5/16 | |
13/32 | 0.4062 | 10.317 | 1 15/16 | 3 5/16 | |
Z | 0.4130 | 10.490 | 2 | 3 3/8 | |
10.50 | 0.4134 | 10.500 | 2 | 3 3/8 | |
27/64 | 0.4219 | 10.716 | 2 | 3 3/8 | |
10.80 | 0.4252 | 10.800 | 2 1/16 | 3 7/16 | |
11.00 | 0.4331 | 11.000 | 2 1/16 | 3 7/16 | |
7/16 | 0.4375 | 11.112 | 2 1/16 | 3 7/16 | |
11.20 | 0.4409 | 11.200 | 2 1/8 | 3 9/16 | |
11.50 | 0.4528 | 11.500 | 2 1/8 | 3 9/16 | |
29/64 | 0.4531 | 11.509 | 2 1/8 | 3 9/16 | |
11.80 | 0.4646 | 11.800 | 2 1/8 | 3 5/8 | |
15/32 | 0.4688 | 11.908 | 2 1/8 | 3 5/8 | |
12.00 | 0.4724 | 12.000 | 2 3/16 | 3 11/16 | |
12.20 | 0.4803 | 12.200 | 2 3/16 | 3 11/16 | |
31/64 | 0.4844 | 12.304 | 2 3/16 | 3 11/16 | |
12.50 | 0.4921 | 12.500 | 2 1/4 | 3 3/4 | |
1/2 | 0.500 | 12.700 | 2 1/4 | 3 3/4 |