| Screw Thread | 1-7/8 | ||
| D | 1.8750 | ||
| P | 12 | ||
| B | Min | L≤10 | 4.000 |
| B | Min | 10＜L≤16 | 4.250 |
| B | Min | L＞16 | 4.750 |
| U | Max | UNC | None |
| U | Max | UNF | None |
| U | Max | BUN | 0.250 |
| Ds | Max | 1.8750 | |
| Ds | Min | UNC | None |
| Ds | Min | UNF | None |
| Ds | Min | BUN | 1.858 |
| Ds1 | Max | UNC | None |
| Ds1 | Max | UNF | None |
| Ds1 | Max | BUN | 1.858 |
| Ds1 | Min | UNC | None |
| Ds1 | Min | UNF | None |
| Ds1 | Min | BUN | 1.784 |