| Screw Thread | M20 | ||
| D | 20 | ||
| P | Coarse Thread | 2.5 | |
| P | Fine Thread-1 | 1.5 | |
| P | Fine Thread-2 | None | |
| B | L≤125 | 46 | |
| B | 125＜L≤200 | 52 | |
| B | L＞200 | 65 | |
| C | Min | 3 | |
| Da | Foam A | Max | 22.4 |
| Da | Foam B | Max | 25.7 |
| Dc | Max | 43 | |
| Ds | Max | 20 | |
| Ds | Min | 19.67 | |
| Du | Max | 22 | |
| Dw | Min | 39.9 | |
| E | Min | 29.87 | |
| F | Max | 4 | |
| K | Max | 17.1 | |
| K1 | Min | 6.8 | |
| R1 | Min | 0.8 | |
| R2 | Max | 1.2 | |
| R3 | Min | 0.4 | |
| R4 | 8.5 | ||
| S | Max | 27 | |
| S | Min | 26.67 | |
| T | Max | 0.65 | |
| T | Min | 0.3 | |