Stud & Bolt Thread Pitches
| Bolt Diameter in Inches |
Stud UN Thread Per Inch |
Bolts UNC Threads Per Inch |
Bolts UNF Threads Per Inch |
Wrench Size Inches |
|---|---|---|---|---|
| 1/4 | 20 | 20 | 28 | |
| 5/16 | 18 | 18 | 24 | |
| 3/8 | 16 | 16 | 24 | |
| 7/16 | 14 | 14 | 20 | |
| 1/2 | 13 | 13 | 20 | 7/8 |
| 9/16 | 12 | 12 | 18 | |
| 5/8 | 11 | 11 | 18 | 1-1/6 |
| 3/4 | 10 | 10 | 16 | 1-1/4 |
| 7/8 | 9 | 9 | 14 | 1-7/16 |
| 1 | 8 | 8 | 12 | 1-5/8 |
| 1-1/8 | 8 | 7 | 12 | 1-13/16 |
| 1-1/4 | 8 | 7 | 12 | 2 |
| 1-3/8 | 8 | 6 | 12 | 2-3/16 |
| 1-1/2 | 8 | 6 | 12 | 2-3/8 |
| 1-5/8 | 8 | 2-9/16 | ||
| 1-3/4 | 8 | 5 | 2-3/4 | |
| 1-7/8 | 8 | 2-15/16 | ||
| 2 | 8 | 4-1/2 | 3-1/8 | |
| 2-1/4 | 8 | 4-1/2 | 3-1/2 | |
| 2-1/2 | 8 | 4 | 3-7/8 | |
| 2-3/4 | 8 | 4 | 4-1/4 | |
| 3 | 8 | 4 | 4-5/8 | |
| 3-1/4 | 8 | 4 | ||
| 3-1/2 | 8 | 4 | ||
| 3-3/4 | 8 | 4 | ||
| 4 | 8 | 4 |