Related Resources: hardware

ISO metric tap and drill sizes

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

ISO metric tapping and clearance drills, coarse thread series

Nominal
size
Tapping drill size (mm)
Clearance drill
size (mm)
Recommended
80%
engagement
Alternative
70%
engagement
Close
fit
Medium
fit
Free
fit
M1.6
1.25
1.30
1.7
1.8
2.0
M2
1.60
1.65
2.2
2.4
2.6
M2.5
2.05
2.10
2.7
2.9
3.1
M3
2.50
2.55
3.2
3.4
3.6
M4
3.30
3.40
4.3
4.5
4.8
M5
4.20
4.30
5.3
5.5
5.8
M6
5.00
5.10
6.4
6.6
7.0
M8
6.80
6.90
8.4
9.0
10.0
M10
8.50
8.60
10.5
11.0
12.0
M12
10.20
10.40
13.0
14.0
15.0
M14
12.00
12.20
15.0
16.0
17.0
M16
14.00
14.25
17.0
18.0
19.0
M18
15.50
15.75
19.0
20.0
21.0
M20
17.50
17.75
21.0
22.0
24.0
M22
19.50
19.75
23.0
24.0
26.0
M24
21.00
21.25
25.0
26.0
28.0
M27
24.00
24.25
28.0
30.0
32.0
M30
26.50
26.75
31.0
33.0
35.0
M33
29.50
29.75
34.0
36.0
38.0
M36
32.00
37.0
39.0
42.0
M39
35.00
40.0
42.0
45.0
M42
37.50
43.0
45.0
48.0
M45
40.50
46.0
48.0
52.0
M48
43.00
50.0
52.0
56.0
M52
47.00
54.0
56.0
62.0
 
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