| Screw Thread | 1-3/8 | ||
| D | 1.375 | ||
| P | 6 | ||
| B | Min | L≤10 | 3 |
| B | Min | 10＜L≤16 | 3.25 |
| B | Min | L＞16 | 3.75 |
| U | Max | UNC | 0.333 |
| U | Max | UNF | 0.167 |
| U | Max | BUN | 0.25 |
| Ds | Max | 1.375 | |
| Ds | Min | UNC | 1.354 |
| Ds | Min | UNF | 1.362 |
| Ds | Min | BUN | 1.358 |
| Ds1 | Max | UNC | 1.354 |
| Ds1 | Max | UNF | 1.362 |
| Ds1 | Max | BUN | 1.358 |
| Ds1 | Min | UNC | 1.256 |
| Ds1 | Min | UNF | 1.313 |
| Ds1 | Min | BUN | 1.284 |