Linear Actuators are not recommended for use in applications where it they are run into dead stops or can be jammed. Examples of jamming include over-travelling the limit switches and jamming the nut and screw internally at the extreme ends of the stroke, or driving the actuator against an immovable object and thus overloading the actuator severely. Therefore consult Power Jacks if jamming is expected. Power Jacks can provide solutions for actuators which are required to exert a force against an end stop, for example an actuator fitted with a spring damper device where spring travel is limit by a limit switch.