| Screw Thread | M18 | ||
| D | 18 | ||
| P | 2.5 | ||
| A | Max | 7.5 | |
| A | Min | 2.5 | |
| C | Max | 0.8 | |
| C | Min | 0.2 | |
| Da | Max | 20.2 | |
| Dw | Grade A | Min | 25.34 |
| Dw | Grade B | Min | 24.85 |
| E | Grade A | Min | 30.14 |
| E | Grade B | Min | 29.56 |
| K | Nominal | 11.5 | |
| K | Grade A | Max | 11.715 |
| K | Grade A | Min | 11.285 |
| K | Grade B | Max | 11.85 |
| K | Grade B | Min | 11.15 |
| K1 | Grade A | Min | 7.9 |
| K1 | Grade B | Min | 7.81 |
| R | Min | 0.6 | |
| S | Max | 27 | |
| S | Grade A | Min | 26.67 |
| S | Grade B | Min | 26.16 |