FlowMarket
Where to find pneumatic cylinders: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the movement — force or bore, stroke, mounting, speed, cycle rate, the standard and whether sensing is needed — and the agent matches you with suppliers of cylinders, actuators and grippers, then requests quotes and lead times so you can compare them in one place.
Sourcing pneumatic actuators
Pneumatics is the one area of machine building where standardisation actually delivers what it promises. ISO 15552 fixes the mounting dimensions, port positions and rod threads for profile cylinders; ISO 6432 does the same for mini cylinders and ISO 21287 for compacts. A cylinder from one manufacturer bolts into another's brackets, which makes this a genuinely competitive market and a rare case where the second quote is worth getting.
That matters most when something breaks. A discontinued series or a sixteen-week lead time is far less serious here than in hydraulics, because an equivalent from another maker usually drops in. Say the standard and the dimensions in the enquiry rather than only the original part number, and suppliers can answer with what they actually have.
Sizing without oversizing
Force is bore area times pressure, minus friction, and the honest way to size is to add a margin to the calculated load rather than to round the bore up twice. Every millimetre of extra bore is air consumed on every stroke for the life of the machine, and compressed air is the most expensive utility in most factories.
Remember the retract stroke is weaker: the rod takes area away from the piston, so a cylinder that pushes 1,800 N at 6 bar may only pull 1,500 N. If the working stroke is the retracting one, size on that number. And on long strokes check buckling — a slender rod at full extension under compression is the failure people design in without noticing.
The details that decide whether it lasts
- Cushioning — a cylinder arriving at the end stop at full speed destroys itself and everything mounted to it. Adjustable pneumatic cushioning handles most cases; high speed or high mass needs shock absorbers, and the energy calculation is worth asking for.
- Magnetic piston — needed if position is to be sensed with reed or Hall switches. Specifying it after the machine is designed means changing the cylinder, so decide early.
- Seals and lubrication — modern cylinders run non-lubricated for life, and once run on oiled air they must continue on it. Mixing the two washes out the factory grease and the cylinder fails early.
- Rod material and coating — standard chrome-plated steel for dry environments, stainless for wash-down or corrosive atmospheres. A food plant will destroy a standard rod on a schedule.
- Speed control — regulate the exhaust side, not the supply. Meter-out control gives a stable, controllable motion; meter-in gives a lurch.
Air consumption is a running cost
Each stroke consumes the swept volume at working pressure, so consumption scales with the square of the bore. A 63 mm cylinder uses roughly 1.6 times the air of a 50 mm one for the same stroke, every cycle, forever. On a machine cycling twenty times a minute across two shifts, that difference is a real annual number.
Two cheap savings follow. Size the bore honestly rather than defensively, and use the lowest pressure that does the job — many machines run at 6 bar because that is what the line supplies, when 4 would move the load. Both are decided at the design stage and are almost impossible to recover later.
Beyond the standard cylinder
Where a rod will not fit or the stroke is long, rodless cylinders carry the load along the barrel and halve the installed length. Guided and twin-rod units take side loads a plain cylinder cannot and remove a separate linear guide. Rotary actuators, grippers and vacuum components come from the same suppliers and are worth quoting together, since handling stations rarely need only one of them.
Electric actuators are the honest alternative to mention: for positioning at several points, variable force, or where air is scarce, an electric axis costs more to buy and far less to run. If your application is a two-position push, pneumatics wins comfortably. If you are asking for three positions, describe the application and let the agent surface both.
How the AI agent matches suppliers
The agent reads your requirement rather than your keywords. It searches the FlowMarket network and connected industrial directories together, scores every candidate on how well it answers what you described — standard, bore and stroke range, environment, sensing, geography — and drops anything that does not clear the bar. Each match comes back with a plain-language reason, which is quicker than checking which catalogue covers your series.