How much weight can linear actuators hold?

The weight that a linear actuator can hold or lift depends on several factors, including the type of actuator, the size and length of the actuator, the load's weight and size, and the force output of the actuator. 

Generally, electric linear actuators can lift and hold the most weight, with some models capable of lifting loads of up to several thousand pounds. Hydraulic linear actuators can also generate high forces, making them suitable for heavy-duty lifting applications.

Pneumatic linear actuators are typically less powerful than hydraulic or electric actuators and are often used for lighter loads. Mechanical linear actuators are also generally less powerful than hydraulic or electric actuators and may be better suited for applications where precise positioning is not critical.

It's important to note that the load capacity of a linear actuator is typically specified by the manufacturer, and exceeding the rated load capacity can result in damage to the actuator or even injury. When selecting a linear actuator for a particular application, it's important to choose one that is rated for the weight of the load being lifted or moved.