8 Pitch
8 Pitch is a class of threads for fasteners with a diameter of 1 inch or larger. The thread pitch is the same for all sizes, 8 threads per inch. This is often used on ASTM parts such as A193 B7.
Other Names: 8UN
| Screw Size | Decimal | 8UN | Tap Drill |
|---|---|---|---|
| 1 1/8 | 1.1250 | 1 1/8-8 | 1 |
| 1 1/4 | 1.2500 | 1 1/4-8 | 1 1/8 |
| 1 3/8 | 1.3750 | 1 3/8-8 | 1 1/4 |
| 1 1/2 | 1.5000 | 1 1/2-8 | 1 3/8 |
| 1 5/8 | 1.6250 | 1 5/8-8 | 1 1/2 |
| 1 3/4 | 1.7500 | 1 3/4-8 | 1 5/8 |
| 1 7/8 | 1.8750 | 1 7/8-8 | 1 3/4 |
| 2 | 2.0000 | 2-8 | 1 7/8 |
| 2 1/4 | 2.2500 | 2 1/4-8 | 2 5/32 |