DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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ISO METRIC FINE THREAD
Tap M |
Max Interal Diameter mm |
Drill Diameter mm |
Ex1 |
3¡¿0.35 |
2.721 |
2.65 |
0 |
3.5¡¿0.35 |
3.221 |
3.2 |
0 |
4¡¿0.5 |
3.599 |
3.5 |
0 |
5¡¿0.5 |
4.599 |
4.5 |
0 |
5.5¡¿0.5 |
5.099 |
5 |
0 |
6¡¿0.75 |
5.378 |
5.3 |
0 |
7¡¿0.75 |
6.378 |
6.3 |
0 |
8¡¿0.75 |
7.378 |
7.3 |
0 |
8¡¿1 |
7.153 |
7 |
0 |
9¡¿1 |
8.153 |
8 |
0 |
10¡¿0.75 |
9.387 |
9.3 |
0 |
10¡¿1 |
9.153 |
9 |
0 |
10¡¿1.25 |
8.912 |
8.8 |
0 |
11¡¿1 |
10.153 |
10 |
0 |
12¡¿1 |
11.153 |
11 |
0 |
12¡¿1.25 |
10.912 |
10.8 |
0 |
12¡¿1.5 |
10.676 |
10.5 |
0 |
14¡¿1 |
13.153 |
13 |
0 |
14¡¿1.25 |
12.912 |
12.8 |
0 |
14¡¿1.5 |
12.676 |
12.5 |
0 |
15¡¿1 |
14.153 |
14 |
0 |
15¡¿1.5 |
13.676 |
13.5 |
0 |
16¡¿1 |
15.153 |
15 |
0 |
16¡¿1.5 |
14.676 |
14.5 |
0 |
18¡¿1 |
17.153 |
17 |
0 |
18¡¿1.5 |
16.676 |
16.5 |
0 |
18¡¿2 |
16.21 |
16 |
0 |
20¡¿1 |
19.153 |
19 |
0 |
20¡¿1.5 |
18.676 |
18.5 |
0 |
20¡¿2 |
18.21 |
18 |
0 |
22¡¿1 |
21.153 |
21 |
0 |
22¡¿1.5 |
20.676 |
20.5 |
0 |
22¡¿2 |
20.21 |
20 |
0 |
24¡¿1 |
23.153 |
23 |
0 |
24¡¿1.5 |
22.676 |
22.5 |
0 |
24¡¿2 |
22.21 |
22 |
0 |
25¡¿1 |
24.153 |
24 |
0 |
25¡¿1.5 |
23.676 |
23.5 |
0 |
25¡¿2 |
23.21 |
23 |
0 |
26¡¿1.5 |
24.676 |
24.5 |
0 |
27¡¿1.5 |
25.676 |
25.5 |
0 |
27¡¿2 |
25.21 |
25 |
0 |
28¡¿1.5 |
26.676 |
26.5 |
0 |
28¡¿2 |
26.21 |
26 |
0 |
30¡¿1.5 |
28.676 |
28.5 |
0 |
30¡¿2 |
28.21 |
28 |
0 |
32¡¿1.5 |
30.676 |
30.5 |
0 |
32¡¿2 |
30.21 |
30 |
0 |
33¡¿2 |
31.21 |
31 |
0 |
35¡¿1.5 |
33.676 |
33.5 |
0 |
36¡¿1.5 |
34.676 |
34.5 |
0 |
36¡¿2 |
34.21 |
34 |
0 |
36¡¿3 |
33.252 |
33 |
0 |
38¡¿1.5 |
36.676 |
36.5 |
0 |
39¡¿3 |
36.252 |
36 |
0 |
40¡¿1.5 |
38.676 |
38.5 |
0 |
40¡¿2 |
38.21 |
38 |
0 |
40¡¿3 |
37.252 |
37 |
0 |
42¡¿1.5 |
40.676 |
40.4 |
0 |
42¡¿2 |
40.21 |
40 |
0 |
42¡¿3 |
39.252 |
39 |
0 |
45¡¿1.5 |
43.676 |
43.5 |
0 |
45¡¿2 |
43.21 |
43 |
0 |
45¡¿3 |
45.252 |
42 |
0 |
48¡¿1.5 |
46.676 |
46.5 |
0 |
48¡¿2 |
46.21 |
46 |
0 |
48¡¿3 |
45.252 |
45 |
0 |
50¡¿1.5 |
48.676 |
48.2 |
0 |
50¡¿2 |
48.21 |
48 |
0 |
50¡¿3 |
47.252 |
47 |
0 | |