How to find the right Pneumatic Air Cylinders AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Pneumatic Air Cylinders
- Bore for required force
- Theoretical extend force is supply pressure × piston area. Retract force is lower by the rod area. Choose a bore so the working load is roughly half to three-quarters of the theoretical force. Friction, pressure drop and dynamic loads mean a cylinder sized at exactly 100% stalls or runs erratically.
- Mounting standard
- Replace like for like: ISO 15552 (tie-rod/profile), ISO 6432 (mini round), ISO 21287 (compact), NFPA (inch tie-rod), or the brand's own compact or round-body series Standardized cylinders share mounting dimensions and rod threads across brands. Non-standard bodies only fit their own brackets.
- Action type
- Double-acting for powered extend and retract. Single-acting spring-return only for short strokes and light return loads. The spring takes up stroke length and subtracts from output force.
- Magnetic piston
- Order a magnetic piston if you will use reed or Hall-effect position sensors Sensors cannot detect a standard piston, and the magnet cannot be added later.
- Cushioning and side load
- Use adjustable air cushions or external shock absorbers for fast or heavy moving loads. Use guided cylinders or external guides when there is any side load. End impacts and side loads on the rod are the main causes of seal and bearing wear.
- Stroke and rod thread
- Confirm the exact stroke length and the rod-end thread (metric M or UNF) and its length Rod clevises, rod eyes and floating joints must match the rod thread exactly.
Brands that matter
- SMC: Very wide ISO and compact cylinder range in metric bores.
- Festo: ISO 15552 and compact cylinders with an extensive sensor and mounting system.
- Bimba: Inch-bore round-body (Original Line) and NFPA cylinders.
- Parker: NFPA and ISO cylinders for industrial use.
- Norgren (IMI): ISO cylinders and accessories.
- Emerson (Aventics): Industrial ISO cylinders.
- Airtac: Budget ISO-pattern cylinders widely used on general machinery.
What to avoid
- Cylinders listed without bore, stroke, rod thread and maximum pressure
- Using an unguided cylinder to carry side or cantilevered loads
- Non-magnetic cylinders when position sensing may be needed later
- Mixing inch NFPA mounts with metric ISO cylinders
Questions
Do I need a magnetic piston?
Only if you plan to sense position with cylinder-mounted switches. It cannot be retrofitted, so choose it at purchase if there is any chance you will need it.