Bellows cylinders function both as driving and pneumatic spring components. Bellows cylinders function as a driving component by providing supply and exhaust functions. When bellows cylinders are supplied with permanent pressure, they act as a cushioning component. The rodless drive consists of a ribbed rubber bellows which is fixed between two metal plates. A major advantage of bellows cylinders is their particularly low installation height compared to other cylinders and their ease of movement. This means that with bellows cylinders, for example, larger axis offsets and angular rotations of up to 20° are also possible. In addition, a large force can be generated by the unique design, since the compressed air acts on a relatively large surface (the metallic end faces). Despite their rough bowl, the cylinders react sensitively and evenly even to small pressure changes. The simple design also allows operation without stick-slip effects. Bellows actuators are single-acting pneumatic drives that do not require spring returns, as the reset is achieved by the application of external force (mostly the dead weight of the load to be lifted). For larger strokes the double-bellows cylinder is the right solution. Festo bellows cylinders cover many applications in pneumatic actuator technology. They are very often used as air springs to carry heavy loads and cushion vibrations. This function is often used in combination with active lifting of loads. Due to their hermetically sealed design, the products are also suitable for harsh, dusty ambient conditions. They are also maintenance-free, since no wearing parts such as seals are used. Bellows cylinders are available with diameters from 80 mm to 385 mm. Strokes of up to 230 mm are also possible. The max. load bearing capacity at 8 bar is 70 kN.