Hydraulic Cylinder Types Overview and Guide
Hydraulic cylinders turn oil pressure into linear force and form the working end of almost every hydraulic system. The design decides whether a cylinder only pushes or also actively pulls, how fast it extends and retracts, and how much force each direction delivers. This guide sorts the main cylinder types and shows what matters when selecting one.
View hydraulic cylindersSingle-acting or double-acting - what is the difference?
The basic difference is how many directions the oil pressure works in. A single-acting cylinder is pressurised in one direction only; a spring, gravity or the load handles the return. A double-acting cylinder has a port on each side of the piston and produces active force in both directions. For controlled motion under load, the double-acting design is the standard choice.
Which cylinder designs exist and what are they for?
Beyond the action, cylinders differ in piston and rod construction. The differential cylinder uses the smaller annular area on the rod side, so it retracts faster but with less force. The synchronous cylinder has a rod running right through, giving equal area, force and speed in both directions. The telescopic cylinder nests several stages inside one another and reaches a long stroke from a short retracted length.
Force equals piston area times pressure. The annular side gives less force than the full piston side.
Compare cylindersTelescopic saves body length; a standard cylinder is simpler and cheaper.
View designsFor long strokes with buckling risk, verify the rod diameter with an expert.
Ask for adviceHow do I choose size, mounting and seals?
Force and stroke come first: the required force and working pressure set the piston diameter, while the stroke drives body length and the buckling risk of the rod. Next come the mounting (flange, clevis, foot) and the seal materials matched to temperature and oil. Standardised series to ISO 6020 or ISO 6022 make later replacement easier.
- Fix the required force and maximum working pressure, then derive the piston diameter.
- Check stroke and mounting position; for long strokes mind the rod's buckling strength.
- Decide the mounting style early, as it affects body length and load path.
- Match seal materials to oil type, temperature and speed.
Frequently asked questions
Why does my cylinder retract faster than it extends?
In a differential cylinder the annular area on the rod side is smaller than the full piston area. At the same flow rate the piston therefore moves faster on the retract stroke but delivers less force. A synchronous cylinder with a through rod avoids this difference.
When do I need a double-acting instead of a single-acting cylinder?
Whenever the cylinder must also pull actively or retract a load under control. Single-acting cylinders only suit cases where gravity or a spring returns them reliably, such as a lift table.
Which standard matters for hydraulic cylinders?
ISO 6020 and ISO 6022 are common for mounting dimensions and body lengths, which eases swapping between makers. They are not mandatory, and many systems use maker-specific compact cylinders. Check the mounting pattern and ports before ordering a replacement.
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