| Screw Thread | 1/2 | ||
| D | 0.5000 | ||
| P | 13 | ||
| B | Min | L≤10 | 1.250 |
| B | Min | 10＜L≤16 | 1.500 |
| B | Min | L＞16 | 2.000 |
| U | Max | UNC | 0.154 |
| U | Max | UNF | 0.100 |
| U | Max | BUN | None |
| Ds | Max | 0.5000 | |
| Ds | Min | UNC | 0.488 |
| Ds | Min | UNF | 0.491 |
| Ds | Min | BUN | None |
| Ds1 | Max | UNC | 0.488 |
| Ds1 | Max | UNF | 0.491 |
| Ds1 | Max | BUN | None |
| Ds1 | Min | UNC | 0.444 |
| Ds1 | Min | UNF | 0.462 |
| Ds1 | Min | BUN | None |