U.S. Screw Machine Length Twist Drill Sizes




Automatic Drill Units, Pneumatic Drills, Multiple Spindle Drills


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Size Diameter Flute Length
inch
Overall Length
inch
U.S. Metric inch mm
  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 4.2161 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>/td> 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




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