Electric actuator developed by brazilian company Suletec.Useful if you want to replace pneumatic actuators, the cons are the heavy weight and robust size and construction which makes hard to fit if you don't have the necessary space.
The spring is animatable and will change if you push or pull the cylinder. (Solidworks only)
Versions available:
-Solidworks 2013 (native)-IGES-STEP-x_t (parasolid)