Technical Foundation
What Is a Pneumatic Cylinder?
A pneumatic cylinder converts compressed air pressure into linear mechanical force and motion, using a piston inside a bored tube that's pushed by air pressure on one or both sides. Double-acting cylinders use air pressure to extend and retract the rod; single-acting cylinders use air (or a spring) for one direction and a spring for the return stroke, which limits available force to whatever the spring doesn't absorb but simplifies air routing and control for simple push/release applications.
Bore size and rod diameter determine the theoretical force output at a given air pressure, calculated from the piston's effective area — but real-world force should be de-rated from the theoretical maximum to account for friction and any back-pressure in the system. ISO 15552 (formerly ISO 6431/VDMA 24562) and NFPA standards define interchangeable mounting dimensions across manufacturers for profile and round-body cylinders respectively, so a cylinder built to spec from one supplier will physically mount and connect the same as another's within that standard.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Bore Size | Standard diameters per ISO 15552 or NFPA, e.g., 32mm, 2" | Sets the piston area and, with system pressure, the theoretical force output of the cylinder |
| Stroke Length | Specified per application, up to several meters for rodless designs | Must match the actual travel distance needed — non-standard strokes are typically special-order |
| Action Type | Double-acting vs. single-acting (spring extend/retract) | Double-acting provides powered force in both directions; single-acting simplifies control at reduced return force |
| Mounting Style | Foot, flange, trunnion, clevis, rod/tie-rod | Determines how the cylinder is fixed to the machine frame and how side-load or misalignment is accommodated |
| Cushioning & Sensing | Adjustable pneumatic cushions, magnetic piston for reed/proximity sensors | Cushioning reduces end-of-stroke impact; magnetic pistons enable non-contact position sensing without an internal switch |
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Applications
Where Pneumatic Cylinders Get Used
Pneumatic cylinders are specified anywhere a machine needs repeatable, controllable linear force and motion driven by compressed air.
Automated Assembly & Packaging Machinery
Compact and profile cylinders providing repeatable, high-cycle linear actuation for pick-and-place and clamping operations.
Material Handling & Conveyor Systems
Rodless cylinders providing long-stroke linear motion for pushers, diverters and transfer stations without the length penalty of a rod cylinder.
Machine Tool & Fixturing
Compact cylinders actuating clamps, stops and locating pins in CNC and manual machine tooling.
Automotive Manufacturing
High-cycle double-acting cylinders driving robotic end-of-arm tooling and body-in-white assembly fixtures.
Food & Packaging Equipment
Stainless and washdown-rated cylinders specified for sanitary environments requiring frequent cleaning cycles.
General Industrial Automation
NFPA and ISO standard cylinders selected for their interchangeable mounting dimensions across OEM equipment designs.
FAQ
Pneumatic Cylinders Questions, Answered
How do I calculate the force output of a pneumatic cylinder?
Theoretical force equals system air pressure multiplied by the piston's effective area (bore area for extension, bore area minus rod area for retraction). Real-world available force should be de-rated from that theoretical number to account for seal friction and any pressure drop in the air supply line, so don't size a cylinder to its exact theoretical output with no margin.
What's the difference between a rod cylinder and a rodless cylinder?
A rod cylinder extends a piston rod out of the cylinder body, so the overall length grows with the stroke — for very long strokes this becomes impractical. A rodless cylinder carries the load on a carriage that travels along the outside of the cylinder body (mechanically or magnetically coupled to the internal piston), keeping the overall footprint compact for long-stroke applications.
What does ISO 15552 mean and why does it matter for cylinder selection?
ISO 15552 (which superseded ISO 6431/VDMA 24562) standardizes the mounting dimensions, bore sizes and port locations for profile-style pneumatic cylinders, so a cylinder built to this standard from one manufacturer will physically interchange with another manufacturer's ISO 15552 cylinder of the same bore and stroke. This matters for spare parts sourcing and multi-vendor equipment design.
What is cylinder cushioning and when do I need it?
Cushioning is an adjustable air-metering feature near the end of the stroke that decelerates the piston before it reaches the end cap, reducing mechanical shock and noise. It's important on cylinders running at higher speed, longer stroke, or heavier load, where an uncushioned piston slamming into the end cap accelerates wear and can damage the mounted load.
How does a magnetic piston cylinder work with position sensors?
A magnetic piston has a ring magnet built into the piston assembly, which lets external reed or proximity sensors mounted on the cylinder body detect piston position without any wiring or seal penetrating the cylinder bore. This is the standard way to add position feedback (end-of-stroke or intermediate position sensing) to a pneumatic cylinder in an automated system.
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