| Single-Acting Cylinder | Compressed air drives the piston in one direction; a spring or external force provides the return stroke. | Clamping, ejecting, simple stopping, indexing, and short-stroke positioning. | Lower air consumption than an equivalent double-acting design; simple control circuit; predictable fail-return behavior. | Limited usable stroke; spring force reduces available output force; return performance can vary with load and orientation. | Check: required working direction, spring return or spring extend, return-load force, stroke, mounting orientation, and cycle frequency. | Confirm cylinder dimensions and mounting interfaces against ISO 6432, ISO 15552, or the applicable manufacturer’s dimensional standard. |
| Double-Acting Cylinder | Compressed air controls both extension and retraction. | Automation slides, handling equipment, gates, stops, lifting mechanisms, and general machine motion. | Positive control in both directions; suitable for longer strokes and higher cycle rates; force can be adjusted by pressure. | Uses air on both strokes; uncontrolled exhaust can cause impact, vibration, or excessive noise. | Check: bore, stroke, required extension and retraction force, operating pressure, cushioning, speed control, and sensor compatibility. | Calculate theoretical force as F = P × A; subtract friction and safety margins before selecting the bore. |
| Compact Cylinder | Usually double-acting linear motion with a shortened body length. | Space-restricted fixtures, small conveyors, compact pick-and-place units, and assembly tooling. | Short installation length; reduced machine footprint; often available with several mounting options. | Shorter bearing guidance and limited stroke-to-body ratios may reduce resistance to side loads. | Check: available installation space, side-load protection, required stroke, port orientation, rod thread, and mounting clearance. | Use external guides when the load creates bending, twisting, or significant radial force on the piston rod. |
| Guided Cylinder | Linear motion supported by guide rods, guide rails, or an integrated guided carriage. | Transfer units, pushing, clamping, pressing, loading, and applications requiring resistance to rotation. | Better resistance to side loads and torque than a basic rod cylinder; improved repeatability for guided movement. | Wider and heavier; guide components may require alignment, lubrication, and protection from contamination. | Check: allowable moment load, guide clearance, load center of gravity, stroke accuracy, mounting rigidity, and lubrication requirements. | Evaluate static and dynamic moments separately, especially during acceleration, deceleration, and emergency stops. |
| Rodless Cylinder | A piston moves inside a tube and drives an external carriage along the cylinder body. | Long-stroke transfer, material handling, door opening, positioning, and applications with limited axial space. | Provides a long stroke without a projecting piston rod; efficient use of floor space; carriage can support loads. | Sealing systems may be sensitive to dust or moisture; load guidance and external access must be considered. | Check: carriage load, moment capacity, stroke, leakage protection, mounting support, speed, cushioning, and environmental contamination. | Do not treat the carriage as a complete guide for every load; add external guidance when torque or side load exceeds the design rating. |
| Rotary Actuator | Converts compressed air into limited-angle rotary motion, commonly through a vane or rack-and-pinion mechanism. | Part turning, gripping, diverting, valve operation, and component orientation. | Compact rotary movement; simple pneumatic control; suitable for repetitive angular positioning. | Limited rotation angle; torque may change with angle and pressure; external loads can damage bearings or shafts. | Check: required angle, output torque, inertia, rotation speed, stopping energy, shaft load, cushioning, and end-position sensing. | Size for both static torque and dynamic torque; include the effects of acceleration, friction, and external impact. |
| Twin-Rod Cylinder | Two synchronized piston rods provide linear extension and retraction. | Compact transfer mechanisms, anti-rotation applications, pressing, and small guided movements. | Improved resistance to rotation; greater mounting stability than a single-rod cylinder in compact assemblies. | More components and seals; alignment errors can increase friction or cause uneven loading. | Check: rod synchronization, parallelism, mounting flatness, allowable load, stroke, and clearance around both rods. | Use rigid, accurately machined mounting surfaces and avoid forcing the rods to compensate for external misalignment. |
| Stainless-Steel or Corrosion-Resistant Cylinder | Linear pneumatic motion using corrosion-resistant construction and sealing materials. | Food processing, washdown areas, chemical environments, outdoor equipment, and humid production zones. | Improved resistance to moisture, cleaning agents, and corrosion when correctly specified. | May cost more; corrosion resistance depends on the complete assembly, including fasteners, ports, sensors, and fittings. | Check: cleaning chemicals, temperature, ingress exposure, surface finish, seal compatibility, drainage, and hygienic design requirements. | Confirm the required enclosure or ingress-protection rating for sensors and accessories; material selection alone does not guarantee washdown suitability. |
| High-Temperature or Low-Temperature Cylinder | Linear pneumatic motion using seals, lubricants, and materials rated for unusual temperatures. | Foundries, ovens, cold storage, outdoor machinery, and processes with thermal cycling. | Maintains function where standard seals or lubricants could harden, soften, or degrade. | Special seals may have different friction, service life, or pressure limits; sensor options can be restricted. | Check: continuous and peak temperature, thermal cycling, seal material, lubricant rating, sensor temperature range, and heat shielding. | Use the complete temperature range of the cylinder, fittings, tubing, sensors, and air preparation components—not only the barrel rating. |
| Cushioned Cylinder | Linear motion with adjustable or fixed end-of-stroke cushioning to reduce impact. | High-speed automation, long-stroke movement, heavy loads, and applications requiring lower noise and vibration. | Reduces end-of-stroke shock; can improve component life and positioning consistency. | Incorrect adjustment can cause sluggish movement or poor cushioning; cushioning is not a substitute for a mechanical stop in every application. | Check: moving mass, operating speed, stroke, air pressure, load direction, cushion adjustment range, and external stop requirements. | Estimate kinetic energy using E = ½mv² and verify that the cylinder’s cushioning system can absorb the application energy. |
| Cylinder with Position Sensing | Linear or rotary motion with magnetic, electronic, or other sensors for end-position feedback. | Sequencing, interlocking, fault detection, counting, and automated position confirmation. | Provides feedback to a controller; supports diagnostics and safer sequence verification. | Sensor signals may be affected by wiring, electromagnetic interference, temperature, mounting, or incorrect adjustment. | Check: sensor type, output circuit, supply voltage, switching current, connector protection, cable routing, and required sensing positions. | Match the sensor output to the input module and verify the required environmental protection, response time, and installation clearance. |
| Locking Cylinder | Linear motion with a mechanical or pneumatic locking function at one or more positions. | Vertical axes, stops, fixtures, access mechanisms, and applications requiring position retention during air loss. | Can help hold a position without continuous air supply, depending on the locking design and load direction. | Locking capacity is application-specific; it may not be suitable as the sole protection against falling loads or hazardous motion. | Check: holding force, emergency-stop behavior, vertical-load safety, locking position, release sequence, wear, and applicable risk assessment. | Use an independent mechanical safety device when a dropped load could cause injury or serious equipment damage. |
| Bellows or Air-Mount Actuator | Short-stroke linear movement generated by expansion of a flexible elastomeric body. | Vibration isolation, lifting, pressing, leveling, and environments where a conventional rod may be unsuitable. | No sliding piston seal; can tolerate some misalignment; useful for vibration isolation and low-maintenance lifting. | Limited stroke and guidance; vulnerable to sharp edges, excessive extension, twisting, and unsuitable chemicals. | Check: compressed and extended height, lateral movement, load, pressure range, chemical exposure, travel limits, and mechanical restraint. | Provide external guidance or travel stops whenever the actuator cannot safely control lateral movement or overextension. |