Types of Pneumatic Cylinders

Pneumatic cylinders are available in several constructions, each suited to different machine layouts, loads and operating environments.

The correct type depends on the movement required, available space, load support, mounting arrangement, working environment and whether standardised dimensions are needed.

ISO 15552 cylinders

ISO 15552 cylinders are widely used general-purpose industrial actuators. They are commonly produced in profile-body or tie-rod construction and are available in a broad range of bore and stroke combinations.

Typical applications include production machinery, conveyors, packaging equipment, material handling and general automation.

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ISO 6432 roundline cylinders

ISO 6432 cylinders are generally smaller round-body actuators used where a compact and relatively simple cylinder is required.

They are commonly used for stops, ejectors, indexing, light clamping and small machine movements.

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ISO 21287 compact cylinders

ISO 21287 compact cylinders provide a short body length compared with a conventional profile cylinder. They are used where installation space is restricted but a recognised compact format is preferred.

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Manufacturer-specific compact cylinders

Many manufacturers produce compact cylinders that do not follow ISO 21287 dimensions. These can provide specialised features or a smaller footprint but should not be assumed to interchange across brands.

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Guided cylinders

Guided cylinders combine the pneumatic actuator with an integrated guide mechanism. The guide supports the moving load, resists rotation and can manage forces that should not be applied directly to an unsupported piston rod.

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Rodless cylinders

Rodless cylinders move a carriage along the cylinder body without a piston rod extending beyond the end of the barrel. They are useful for long strokes where the total installed length of a conventional cylinder would be excessive.

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Clamping cylinders

Clamping cylinders are designed specifically for holding, locating or securing components. The category includes linear clamps, swing clamps and other workholding actuators.

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Stainless steel cylinders

Stainless steel cylinders are used where corrosion resistance, washdown performance or material cleanliness is important. The exact materials and suitability vary between individual ranges.

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Single acting and double acting cylinders

Single acting cylinders use air for movement in one direction, with a spring or external force providing the return movement. Double acting cylinders use compressed air for both extension and retraction.

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