d (nom.)
Threads per inch
Drill ø
1/4
20
6,7
5/16
18
8,4
3/8
16
10
7/16
14
11,6
1/2
13
13,2
9/16
12
14,9
5/8
11
16,5
3/4
19,8
7/8
9
23
1.IN.
8
26,4
Thread
Material
Brand
Packaging
Code
UNC
St.St. A2
AMECOIL
Standard
71140