Standard: ISO (Coarse) |
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Nominal Thread (D) |
Pitch |
Wrench Size (S) |
M3 |
0.50 |
5.5 |
M4 |
0.70 |
7.0 |
M5 |
0.75 |
8.0 |
M6 |
0.80 |
10.0 |
M8 |
1.25 |
13.0 |
M10 |
1.50 |
15.0 |
M12 |
1.75 |
18.0 |
M14 |
2.00 |
21.0 |
M16 |
2.00 |
24.0 |
M20 |
2.50 |
30.0 |
Standard: UNC |
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Nominal Thread (D) |
TPI |
Wrench Size (S) |
1/4'' |
20 |
7/16'' |
5/16'' |
18 |
1/2'' |
3/8'' |
16 |
9/16'' |
7/16'' |
14 |
11/16'' |
1/2'' |
13 |
3/4'' |
9/16'' |
12 |
7/8'' |
5/8'' |
11 |
15/16'' |
3/4'' |
10 |
1-1/8'' |