d
Threads per inch
1/4
20
5/16
18
3/8
16
1/2
13
5/8
11
3/4
10
7/8
9
1.IN.
8
Thread
Material
Class
Packaging
Code
Page
UNC
St
≥4.8
3 feet
Standard
20280
4-15
St.St. A4
55073