| Screw Thread | 1-1/4 | ||
| D | 1.25 | ||
| P | 7 | ||
| B | Min | L≤10 | 2.75 |
| B | Min | 10＜L≤16 | 3 |
| B | Min | L＞16 | 3.5 |
| U | Max | UNC | 0.286 |
| U | Max | UNF | 0.167 |
| U | Max | BUN | 0.25 |
| Ds | Max | 1.25 | |
| Ds | Min | UNC | 1.231 |
| Ds | Min | UNF | 1.237 |
| Ds | Min | BUN | 1.233 |
| Ds1 | Max | UNC | 1.231 |
| Ds1 | Max | UNF | 1.237 |
| Ds1 | Max | BUN | 1.233 |
| Ds1 | Min | UNC | 1.148 |
| Ds1 | Min | UNF | 1.188 |
| Ds1 | Min | BUN | 1.16 |