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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