| Diameter of AL plate | Impact area | Spring coefficient | Damping coefficient c (kg/sec) | |||
| D (mm) | A (mm2) | k1 (kN/m) | k2 (kN/m) | 0 < t < 0.2 msec | 0.2 < t < 0.4 msec | t > 0.4 msec |
| 60 | 2827 | 1000 | 3000 | 2000 | Linearly decrease | 300 |
| 50 | 1963 | 694 | 2083 | 1389 | Linearly decrease | 208 |
| 40 | 1257 | 444 | 1333 | 889 | Linearly decrease | 133 |
| 30 | 707 | 250 | 750 | 378 | Linearly decrease | 75 |
| 20 | 315 | 111 | 333 | 222 | Linearly decrease | 33 |