Thread Pitch Chart
Technical Info - Thread Pitch Chart
| Size | Diameter (in) | Thread Pitch (TPI) | |
|---|---|---|---|
| UNC | UNF | ||
| #0 | 0.0600 | - | 80 |
| #1 | 0.0730 | 64 | 72 |
| #2 | 0.0860 | 56 | 64 |
| #3 | 0.0990 | 48 | 56 |
| #4 | 0.1120 | 40 | 48 |
| #5 | 0.1250 | 40 | 44 |
| #6 | 0.1380 | 32 | 40 |
| #8 | 0.1640 | 32 | 36 |
| #10 | 0.1900 | 24 | 32 |
| #12 | 0.2160 | 24 | 28 |
| 1/4 | 0.2500 | 20 | 28 |
| 5/16 | 0.3125 | 18 | 24 |
| 3/8 | 0.3750 | 16 | 24 |
| 7/16 | 0.4375 | 14 | 20 |
| 1/2 | 0.5000 | 13 | 20 |
| 9/16 | 0.5625 | 12 | 18 |
| 5/8 | 0.6250 | 11 | 18 |
| 3/4 | 0.7500 | 10 | 16 |
| 7/8 | 0.8750 | 9 | 14 |
| 1 | 1.0000 | 8 | 12 |
| Size | Diameter (in) | Thread Pitch (TPI) | ||
|---|---|---|---|---|
| UNC | 8-UN | UNF | ||
| 1-1/8 | 1.1250 | 7 | 8 | 12 |
| 1-1/4 | 1.2500 | 7 | 8 | 12 |
| 1-3/8 | 1.3750 | 6 | 8 | 12 |
| 1-1/2 | 1.5000 | 6 | 8 | 12 |
| 1-5/8 | 1.6250 | - | 8 | - |
| 1-3/4 | 1.7500 | 5 | 8 | - |
| 1-7/8 | 1.8750 | - | 8 | - |
| 2 | 2.0000 | 4-1/2 | 8 | - |
| 2-1/4 | 2.2500 | 4-1/2 | 8 | - |
| 2-1/2 | 2.5000 | 4 | 8 | - |
| 2-3/4 | 2.7500 | 4 | 8 | - |
| 3 | 3.0000 | 4 | 8 | - |
| 3-1/4 | 3.2500 | 4 | 8 | - |
| 3-1/2 | 3.5000 | 4 | 8 | - |
| 3-3/4 | 3.7500 | 4 | 8 | - |
| 4 | 4.0000 | 4 | 8 | - |