DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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ISO METRIC COARSE THREAD
Tap M |
Pitch mm |
Max Interal Diameter mm |
Drill Diameter mm |
1.6 |
0.35 |
1.321 |
1.25 |
1.8 |
0.35 |
1.521 |
1.45 |
2 |
0.4 |
1.679 |
1.6 |
2.2 |
0.45 |
1.833 |
1.75 |
2.5 |
0.45 |
2.138 |
2.05 |
3 |
0.5 |
2.599 |
2.5 |
3.5 |
0.6 |
3.01 |
2.9 |
4 |
0.7 |
3.422 |
3.3 |
4.5 |
0.75 |
3.878 |
3.8 |
5 |
0.8 |
4.334 |
4.2 |
6 |
1 |
5.153 |
5 |
7 |
1 |
6.153 |
6 |
8 |
1.25 |
6.912 |
6.8 |
9 |
1.25 |
7.912 |
7.8 |
10 |
1.5 |
8.676 |
8.5 |
11 |
1.5 |
9.676 |
9.5 |
12 |
1.75 |
10.441 |
10.3 |
14 |
2 |
12.21 |
12 |
16 |
2 |
14.21 |
14 |
18 |
2.5 |
15.744 |
15.5 |
20 |
2.5 |
17.744 |
17.5 |
22 |
2.5 |
19.744 |
19.5 |
24 |
3 |
21.252 |
21 |
27 |
3 |
24.252 |
24 |
30 |
3.5 |
26.771 |
26.5 |
33 |
3.5 |
29.771 |
29.5 |
36 |
4 |
32.27 |
32 |
39 |
4 |
35.27 |
35 |
42 |
4.5 |
37.799 |
37.5 |
45 |
4.5 |
40.799 |
40.5 |
48 |
5 |
43.297 |
43 |
52 |
5 |
47.297 |
47 | |