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