DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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ISO UNIFIED FINE THREAD
Tap UNF |
Max Interal Diameter mm |
Drill Diameter mm |
Ex1 |
nr 2-64 |
1.913 |
1.8 |
0 |
nr 3-56 |
2.197 |
2.1 |
0 |
nr 4-48 |
2.459 |
2.4 |
0 |
nr 5-44 |
2.741 |
2.7 |
0 |
nr 6-40 |
3.023 |
2.95 |
0 |
nr 8-36 |
3.607 |
3.5 |
0 |
nr 10-32 |
4.166 |
4.1 |
0 |
nr 12-28 |
4.724 |
4.7 |
0 |
1/4-28 |
5.58 |
5.5 |
0 |
5/18-24 |
7.038 |
6.9 |
0 |
3/8-24 |
8.626 |
8.5 |
0 |
7/16-20 |
10.03 |
9.9 |
0 |
1/2-20 |
11.618 |
11.5 |
0 |
9/16-18 |
13.084 |
12.9 |
0 |
5/8-18 |
14.671 |
14.5 |
0 |
3/4-16 |
17.689 |
17.5 |
0 |
7/8-14 |
20.663 |
20.5 |
0 |
1-12 |
23.569 |
23.25 |
0 |
1.1/8-12 |
26.744 |
26.5 |
0 |
1.1/4-12 |
29.919 |
29.5 |
0 |
1.3/8-12 |
33.094 |
33 |
0 |
1.1/2-12 |
36.269 |
36 |
0 | |