ST8918 Series
| Type | ST8918S4508 | ST8918M4508 | ST8918L4508 | ST8918L6708 |
| Current per winding [A] | 6,4 | 6,4 | 6,4 | 9,5 |
| Holding torque [Ncm] | 311,1 | 594,0 | 933,4 | 933,4 |
| Resistance per winding [Ohm] | 0,28 | 0,33 | 0,55 | 0,23 |
| Inductance per winding [mH] | 1,60 | 3,0 | 6,3 | 2,7 |
| Rotor moment of inertia [gcm²] | 1000 | 2700 | 3000 | 3000 |
| Weight [kg] | 1,7 | 2,8 | 3,95 | 3,95 |
| Length "A" [mm] | 65 | 96 | 126 | 126 |