U.S. Thread Chart
|
Diameter of Bolt |
Coarse Thread
(UNC)
TPI |
Fine Thread
(UNF)
TPI |
|
No. 2 |
56 |
- |
|
No. 3 |
48 |
- |
|
No. 4 |
40 |
- |
|
No. 5 |
40 |
- |
|
No. 6 |
32 |
- |
|
No. 8 |
32 |
- |
|
No. 10 |
24 |
32 |
|
No. 12 |
24 |
- |
|
1/4 |
20 |
28 |
|
5/16 |
18 |
24 |
|
3/8 |
16 |
24 |
|
7/16 |
14 |
20 |
|
1/2 |
13 |
20 |
|
9/16 |
12 |
18 |
|
5/8 |
11 |
18 |
|
3/4 |
10 |
16 |
|
7/8 |
9 |
14 |
|
1 |
8 |
14 |
|
1-1/8 |
7 |
12 |
|
1-1/4 |
7 |
12 |
|
1-1/2 |
6 |
12 |
|
