d (nom.)
Threads per inch
Drill ø
1/4
28
6,7
5/16
24
8,3
3/8
9,9
7/16
20
11,5
1/2
13,1
9/16
18
14,7
5/8
16,3
3/4
16
19,5
7/8
14
22,7
1.IN.
12
26
Thread
Material
Brand
Packaging
Code
UNF
St.St. A2
AMECOIL
Standard
71130