| Standards | Seamless | Welded | |
|---|---|---|---|
| 1 | ASTM | B 161 / 163 | B 725 / 730 |
| 2 | ASME | SB 161 / 163 | SB 725 / 730 |
| NB Sizes | Sch 5 | Sch 10 | Sch 40 | Sch 80 | Sch 160 |
|---|---|---|---|---|---|
| 1/8" | ✓ | ✓ | ✓ | ✓ | |
| 1/4" | ✓ | ✓ | ✓ | ✓ | |
| 3/8" | ✓ | ✓ | ✓ | ✓ | |
| 1/2" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3/4" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1 1/4" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 1 1/2" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 25 mm | ✓ | ✓ | ✓ | ✓ | ✓ |
| 2" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 2 1/2" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 4" | ✓ | ✓ | ✓ | ✓ | ✓ |
| 5" | ✓ | ✓ | ✓ | ✓ | |
| 6" | ✓ | ✓ | ✓ | ✓ |