DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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ISO UNIFIED FINE THREAD
Tap UNF |
Max. Internal Diameter mm |
Drill Diameter mm |
Ex1 |
nr 1-72 |
1.613 |
1.7 |
0 |
nr 2-64 |
1.913 |
2 |
0 |
nr 3-56 |
2.197 |
2.3 |
0 |
nr 4-48 |
2.459 |
2.6 |
0 |
nr 5-44 |
2.741 |
2.9 |
0 |
nr 6-10 |
3.023 |
3.2 |
0 |
nr 8-36 |
3.607 |
3.9 |
0 |
nr 10-32 |
4.166 |
4.5 |
0 |
nr 12-28 |
4.724 |
5.1 |
0 |
1/4-28 |
5.588 |
6 |
0 |
5/16-24 |
7.038 |
7.5 |
0 |
3/8-24 |
8.626 |
9.1 |
0 |
7/16-20 |
10.03 |
10.6 |
0 |
1/2-20 |
11.618 |
12.1 |
0 | |