Hole and Drill Data
Metric Tap and Clearance Hole Sizes
Below is a table of tap and clearance hole sizes for metric threads. All values are in mm.
Screw Size |
Tap Hole Drill Size |
Clearance Holes Close Fit Drill Size |
Clearance Holes Free Fit Drill Size |
| M 1.6 | 1.25 | 1.7 | 2.0 |
| M 2 | 1.60 | 2.2 | 2.6 |
| M 2.5 | 2.05 | 2.7 | 3.1 |
| M 3 | 2.50 | 3.2 | 3.6 |
| M 4 | 3.30 | 4.3 | 4.8 |
| M 5 | 4.20 | 5.3 | 5.8 |
| M 6 | 5.00 | 6.4 | 7.0 |
| M 7 | 6.00 | 7.4 | 8.0 |
| M 8 | 6.80 | 8.4 | 10.0 |
| M 10 | 8.50 | 10.5 | 12.0 |
| M 12 | 10.20 | 13 | 15.0 |
| M 14 | 12.00 | 15 | 17.0 |
| M 16 | 14.00 | 17.0 | 19.0 |
| M 18 | 15.50 | 19.0 | 21.0 |
| M 20 | 17.50 | 21.0 | 24.0 |
| M 22 | 19.50 | 23.0 | 26.0 |
| M 24 | 21.00 | 25.0 | 28.0 |
| M 27 | 24.00 | 28.0 | 32.0 |
| M 30 | 26.50 | 31.0 | 35.0 |
| M 33 | 29.50 | 34.0 | 38.0 |
Standard Drill Sizes
Below is a table of standard drill sizes and their decimal equivalents:
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
80 |
- |
0.0135 |
0.34 |
- |
0.35 |
0.0138 |
0.35 |
79 |
- |
0.0145 |
0.37 |
1/64 |
- |
0.0156 |
0.40 |
- |
0.40 |
0.0157 |
0.40 |
78 |
- |
0.0160 |
0.41 |
- |
0.45 |
0.0177 |
0.45 |
77 |
- |
0.0180 |
0.46 |
- |
0.50 |
0.0197 |
0.50 |
76 |
- |
0.0200 |
0.51 |
75 |
- |
0.0210 |
0.53 |
- |
0.55 |
0.0217 |
0.55 |
74 |
- |
0.0225 |
0.57 |
- |
0.60 |
0.0236 |
0.60 |
73 |
- |
0.0240 |
0.61 |
72 |
- |
0.0250 |
0.64 |
- |
0.65 |
0.0256 |
0.65 |
71 |
- |
0.0260 |
0.66 |
- |
0.70 |
0.0276 |
0.70 |
70 |
- |
0.0280 |
0.71 |
69 |
- |
0.0292 |
0.74 |
- |
0.75 |
0.0295 |
0.75 |
68 |
- |
0.0310 |
0.79 |
1/32 |
- |
0.0313 |
0.80 |
- |
0.80 |
0.0315 |
0.80 |
67 |
- |
0.0320 |
0.81 |
66 |
- |
0.0330 |
0.84 |
- |
0.85 |
0.0335 |
0.85 |
65 |
- |
0.0350 |
0.89 |
- |
0.90 |
0.0355 |
0.90 |
64 |
- |
0.0360 |
0.91 |
63 |
- |
0.0370 |
0.94 |
- |
0.95 |
0.0374 |
0.95 |
62 |
- |
0.0380 |
0.97 |
61 |
- |
0.0390 |
0.99 |
- |
1.00 |
0.0394 |
1.00 |
60 |
- |
0.0400 |
1.02 |
59 |
- |
0.0410 |
1.04 |
- |
1.05 |
0.0413 |
1.05 |
58 |
- |
0.0420 |
1.07 |
57 |
- |
0.0430 |
1.09 |
- |
1.10 |
0.0433 |
1.10 |
- |
1.15 |
0.0453 |
1.15 |
56 |
- |
0.0465 |
1.18 |
3/64 |
- |
0.0469 |
1.19 |
- |
1.20 |
0.0472 |
1.20 |
- |
1.25 |
0.0492 |
1.25 |
- |
1.30 |
0.0512 |
1.30 |
55 |
- |
0.0520 |
1.32 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
- |
1.35 |
0.0531 |
1.35 |
54 |
- |
0.0550 |
1.40 |
- |
1.40 |
0.0551 |
1.40 |
- |
1.45 |
0.0571 |
1.45 |
- |
1.50 |
0.0591 |
1.50 |
53 |
- |
0.0595 |
1.51 |
- |
1.55 |
0.0610 |
1.55 |
1/16 |
- |
0.0625 |
1.59 |
- |
1.60 |
0.0629 |
1.60 |
52 |
- |
0.0635 |
1.61 |
- |
1.65 |
0.0650 |
1.65 |
- |
1.70 |
0.0669 |
1.70 |
51 |
- |
0.0670 |
1.70 |
- |
1.75 |
0.0689 |
1.75 |
50 |
- |
0.0700 |
1.78 |
- |
1.80 |
0.0709 |
1.80 |
- |
1.85 |
0.0728 |
1.85 |
49 |
- |
0.0730 |
1.85 |
- |
1.90 |
0.0748 |
1.90 |
48 |
- |
0.0760 |
1.93 |
- |
1.95 |
0.0768 |
1.95 |
5/64 |
- |
0.0781 |
1.98 |
47 |
- |
0.0785 |
1.99 |
- |
2.00 |
0.0787 |
2.00 |
- |
2.05 |
0.0807 |
2.05 |
46 |
- |
0.0810 |
2.06 |
45 |
- |
0.0820 |
2.08 |
- |
2.10 |
0.0827 |
2.10 |
- |
2.15 |
0.0846 |
2.15 |
44 |
- |
0.0860 |
2.18 |
- |
2.20 |
0.0866 |
2.20 |
- |
2.25 |
0.0886 |
2.25 |
43 |
- |
0.0890 |
2.26 |
- |
2.30 |
0.0905 |
2.30 |
- |
2.35 |
0.0925 |
2.35 |
42 |
- |
0.0935 |
2.37 |
3/32 |
- |
0.0937 |
2.38 |
- |
2.40 |
0.0945 |
2.40 |
41 |
- |
0.0960 |
2.44 |
- |
2.45 |
0.0965 |
2.45 |
40 |
- |
0.0980 |
2.49 |
- |
2.50 |
0.0984 |
2.50 |
39 |
- |
0.0995 |
2.53 |
- |
2.55 |
0.1004 |
2.55 |
38 |
- |
0.1015 |
2.58 |
- |
2.60 |
0.1024 |
2.60 |
37 |
- |
0.1040 |
2.64 |
- |
2.65 |
0.1043 |
2.65 |
- |
2.70 |
0.1063 |
2.70 |
36 |
- |
0.1065 |
2.71 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
- |
2.75 |
0.1083 |
2.75 |
7/64 |
- |
0.1093 |
2.78 |
35 |
- |
0.1100 |
2.79 |
- |
2.80 |
0.1102 |
2.80 |
34 |
- |
0.1110 |
2.82 |
33 |
- |
0.1130 |
2.87 |
- |
2.90 |
0.1142 |
2.90 |
32 |
- |
0.1160 |
2.95 |
- |
3.00 |
0.1181 |
3.00 |
31 |
- |
0.1200 |
3.05 |
- |
3.10 |
0.1220 |
3.10 |
1/8 |
- |
0.1250 |
3.18 |
- |
3.20 |
0.1260 |
3.20 |
- |
3.25 |
0.1280 |
3.25 |
30 |
- |
0.1285 |
3.26 |
- |
3.30 |
0.1299 |
3.30 |
- |
3.40 |
0.1339 |
3.40 |
29 |
- |
0.1360 |
3.45 |
- |
3.50 |
0.1378 |
3.50 |
28 |
- |
0.1405 |
3.57 |
9/64 |
- |
0.1406 |
3.57 |
- |
3.60 |
0.1417 |
3.60 |
27 |
- |
0.1440 |
3.66 |
- |
3.70 |
0.1457 |
3.70 |
26 |
- |
0.1470 |
3.73 |
- |
3.75 |
0.1477 |
3.75 |
25 |
- |
0.1495 |
3.80 |
- |
3.80 |
0.1496 |
3.80 |
24 |
- |
0.1520 |
3.86 |
- |
3.90 |
0.1535 |
3.90 |
23 |
- |
0.1540 |
3.91 |
5/32 |
- |
0.1562 |
3.97 |
22 |
- |
0.1570 |
3.99 |
- |
4.00 |
0.1575 |
4.00 |
21 |
- |
0.1590 |
4.04 |
20 |
- |
0.1610 |
4.09 |
- |
4.10 |
0.1614 |
4.10 |
- |
4.20 |
0.1654 |
4.20 |
19 |
- |
0.1660 |
4.22 |
- |
4.25 |
0.1674 |
4.25 |
- |
4.30 |
0.1693 |
4.30 |
18 |
- |
0.1695 |
4.31 |
11/64 |
- |
0.1719 |
4.37 |
17 |
- |
0.1730 |
4.39 |
- |
4.40 |
0.1732 |
4.40 |
16 |
- |
0.1770 |
4.50 |
- |
4.50 |
0.1771 |
4.50 |
15 |
- |
0.1800 |
4.57 |
- |
4.60 |
0.1811 |
4.60 |
14 |
- |
0.1820 |
4.62 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
13 |
- |
0.1850 |
4.70 |
- |
4.70 |
0.1850 |
4.70 |
- |
4.75 |
0.1870 |
4.75 |
3/16 |
- |
0.1875 |
4.76 |
12 |
- |
0.1890 |
4.80 |
- |
4.80 |
0.1890 |
4.80 |
11 |
- |
0.1910 |
4.85 |
- |
4.90 |
0.1929 |
4.90 |
10 |
- |
0.1935 |
4.91 |
9 |
- |
0.1960 |
4.98 |
- |
5.00 |
0.1968 |
5.00 |
8 |
- |
0.1990 |
5.05 |
- |
5.10 |
0.2008 |
5.10 |
7 |
- |
0.2010 |
5.11 |
13/64 |
- |
0.2031 |
5.16 |
6 |
- |
0.2040 |
5.18 |
- |
5.20 |
0.2047 |
5.20 |
5 |
- |
0.2055 |
5.22 |
- |
5.25 |
0.2067 |
5.25 |
- |
5.30 |
0.2087 |
5.30 |
4 |
- |
0.2090 |
5.31 |
- |
5.40 |
0.2126 |
5.40 |
3 |
- |
0.2130 |
5.41 |
- |
5.50 |
0.2165 |
5.50 |
7/32 |
- |
0.2187 |
5.55 |
- |
5.60 |
0.2205 |
5.60 |
2 |
- |
0.2210 |
5.61 |
- |
5.70 |
0.2244 |
5.70 |
- |
5.75 |
0.2264 |
5.75 |
1 |
- |
0.2280 |
5.79 |
- |
5.80 |
0.2283 |
5.80 |
- |
5.90 |
0.2323 |
5.90 |
A |
- |
0.2340 |
5.94 |
15/64 |
- |
0.2344 |
5.95 |
- |
6.00 |
0.2362 |
6.00 |
B |
- |
0.2380 |
6.05 |
- |
6.10 |
0.2401 |
6.10 |
C |
- |
0.2420 |
6.15 |
- |
6.20 |
0.2441 |
6.20 |
D |
- |
0.2460 |
6.25 |
- |
6.25 |
0.2461 |
6.25 |
- |
6.30 |
0.2480 |
6.30 |
E |
- |
0.2500 |
6.35 |
1/4 |
- |
0.2500 |
6.35 |
- |
6.40 |
0.2520 |
6.40 |
- |
6.50 |
0.2559 |
6.50 |
F |
- |
0.2570 |
6.53 |
- |
6.60 |
0.2598 |
6.60 |
G |
- |
0.2610 |
6.63 |
- |
6.70 |
0.2638 |
6.70 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
17/64 |
- |
0.2656 |
6.75 |
- |
6.75 |
0.2658 |
6.75 |
H |
- |
0.2660 |
6.76 |
- |
6.80 |
0.2677 |
6.80 |
- |
6.90 |
0.2716 |
6.90 |
I |
- |
0.2720 |
6.91 |
- |
7.00 |
0.2756 |
7.00 |
J |
- |
0.2770 |
7.04 |
- |
7.10 |
0.2795 |
7.10 |
K |
- |
0.2811 |
7.14 |
9/32 |
- |
0.2812 |
7.14 |
- |
7.20 |
0.2835 |
7.20 |
- |
7.25 |
0.2855 |
7.25 |
- |
7.30 |
0.2874 |
7.30 |
L |
- |
0.2900 |
7.37 |
- |
7.40 |
0.2913 |
7.40 |
M |
- |
0.2950 |
7.49 |
- |
7.50 |
0.2953 |
7.50 |
19/64 |
- |
0.2968 |
7.54 |
- |
7.60 |
0.2990 |
7.60 |
N |
- |
0.3020 |
7.67 |
- |
7.70 |
0.3031 |
7.70 |
- |
7.75 |
0.3051 |
7.75 |
- |
7.80 |
0.3071 |
7.80 |
- |
7.90 |
0.3110 |
7.90 |
5/16 |
- |
0.3125 |
7.94 |
- |
8.00 |
0.3150 |
8.00 |
O |
- |
0.3160 |
8.03 |
- |
8.10 |
0.3189 |
8.10 |
- |
8.20 |
0.3228 |
8.20 |
P |
- |
0.3230 |
8.20 |
- |
8.25 |
0.3248 |
8.25 |
- |
8.30 |
0.3267 |
8.30 |
21/64 |
- |
0.3281 |
8.33 |
- |
8.40 |
0.3307 |
8.40 |
Q |
- |
0.3320 |
8.43 |
- |
8.50 |
0.3346 |
8.50 |
- |
8.60 |
0.3386 |
8.60 |
R |
- |
0.3390 |
8.61 |
- |
8.70 |
0.3425 |
8.70 |
11/32 |
- |
0.3437 |
8.73 |
- |
8.75 |
0.3445 |
8.75 |
- |
8.80 |
0.3465 |
8.80 |
S |
- |
0.3480 |
8.84 |
- |
8.90 |
0.3504 |
8.90 |
- |
9.00 |
0.3543 |
9.00 |
T |
- |
0.3580 |
9.09 |
- |
9.10 |
0.3583 |
9.10 |
23/64 |
- |
0.3594 |
9.13 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
- |
9.20 |
0.3622 |
9.20 |
- |
9.25 |
0.3642 |
9.25 |
- |
9.35 |
0.3661 |
9.35 |
U |
- |
0.3680 |
9.35 |
- |
9.40 |
0.3701 |
9.40 |
- |
9.50 |
0.3740 |
9.50 |
3/8 |
- |
0.3750 |
9.53 |
V |
- |
0.3770 |
9.58 |
- |
9.60 |
0.3780 |
9.60 |
- |
9.70 |
0.3819 |
9.70 |
- |
9.75 |
0.3839 |
9.75 |
- |
9.80 |
0.3858 |
9.80 |
W |
- |
0.3860 |
9.80 |
- |
9.90 |
0.3898 |
9.90 |
25/64 |
- |
0.3906 |
9.92 |
- |
10.00 |
0.3937 |
10.00 |
X |
- |
0.3970 |
10.08 |
Y |
- |
0.4040 |
10.26 |
13/32 |
- |
0.4062 |
10.32 |
Z |
- |
0.4130 |
10.49 |
- |
10.50 |
0.4133 |
10.50 |
27/64 |
- |
0.4219 |
10.72 |
- |
11.00 |
0.4331 |
11.00 |
7/16 |
- |
0.4375 |
11.11 |
- |
11.50 |
0.4528 |
11.50 |
29/64 |
- |
0.4531 |
11.51 |
15/32 |
- |
0.4687 |
11.90 |
- |
12.00 |
0.4724 |
12.00 |
31/64 |
- |
0.4844 |
12.30 |
- |
12.50 |
0.4921 |
12.50 |
1/2 |
- |
0.5000 |
12.70 |
- |
13.00 |
0.5118 |
13.00 |
33/64 |
- |
0.5156 |
13.10 |
17/32 |
- |
0.5312 |
13.49 |
- |
13.50 |
0.5315 |
13.50 |
35/64 |
- |
0.5469 |
13.89 |
- |
14.00 |
0.5512 |
14.00 |
9/16 |
- |
0.5625 |
14.29 |
- |
14.50 |
0.5708 |
14.50 |
37/64 |
- |
0.5781 |
14.68 |
- |
15.00 |
0.5906 |
15.00 |
19/32 |
- |
0.5937 |
15.08 |
39/64 |
- |
0.6094 |
15.48 |
- |
15.50 |
0.6102 |
15.50 |
5/8 |
- |
0.6250 |
15.88 |
- |
16.00 |
0.6300 |
16.00 |
41/64 |
- |
0.6406 |
16.27 |
Drill Size |
Decimal Equivalent |
||
in. |
mm |
in. |
mm |
- |
16.50 |
0.6496 |
16.50 |
21/32 |
- |
0.6562 |
16.67 |
- |
17.00 |
0.6693 |
17.00 |
43/64 |
- |
0.6719 |
17.07 |
11/16 |
- |
0.6875 |
17.46 |
- |
17.50 |
0.6889 |
17.50 |
45/64 |
- |
0.7031 |
17.86 |
- |
18.00 |
0.7087 |
18.00 |
23/32 |
- |
0.7187 |
18.25 |
- |
18.50 |
0.7283 |
18.50 |
47/64 |
- |
0.7344 |
18.65 |
- |
19.00 |
0.7480 |
19.00 |
3/4 |
- |
0.7500 |
19.05 |
49/64 |
- |
0.7656 |
19.45 |
- |
19.50 |
0.7677 |
19.50 |
25/32 |
- |
0.7812 |
19.84 |
- |
20.00 |
0.7874 |
20.00 |
51/64 |
- |
0.7969 |
20.24 |
- |
20.50 |
0.8071 |
20.50 |
13/16 |
- |
0.8125 |
20.64 |
- |
21.00 |
0.8268 |
21.00 |
53/64 |
- |
0.8281 |
21.03 |
27/32 |
- |
0.8437 |
21.43 |
- |
21.50 |
0.8465 |
21.50 |
55/64 |
- |
0.8594 |
21.83 |
- |
22.00 |
0.8661 |
22.00 |
7/8 |
- |
0.8750 |
22.23 |
- |
22.50 |
0.8858 |
22.50 |
57/64 |
- |
0.8906 |
22.62 |
- |
23.00 |
0.9055 |
23.00 |
29/32 |
- |
0.9062 |
23.02 |
59/64 |
- |
0.9219 |
23.42 |
- |
23.50 |
0.9252 |
23.50 |
15/16 |
- |
0.9375 |
23.81 |
- |
24.00 |
0.9449 |
24.00 |
61/64 |
- |
0.9531 |
24.21 |
- |
24.50 |
0.9646 |
24.50 |
31/32 |
- |
0.9687 |
24.60 |
- |
25.00 |
0.9843 |
25.00 |
63/64 |
- |
0.9844 |
25.00 |
1 |
- |
1.0000 |
25.40 |