The AirTAC AirTAC SDA20X55S Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 55mm stroke, M5×0.8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA20X55S is a double-acting single-rod compact cylinder engineered for tight machinery footprints. Its riveted assembly reduces axial mounting depth compared to round-body units, while the hard-anodized 20 mm bore yields 157.1 N of push force at 0.5 MPa. The 55 mm stroke operates at speeds between 30 and 500 mm/s.
This unit includes the -S option for a built-in piston magnet, allowing position detection via an AirTAC reed or electronic switch fitted into the body grooves. End-stroke deceleration relies on a fixed NBR bumper rather than an adjustable air cushion, meaning external shock absorbers are advised for high-energy cycles. The 8 mm rod uses an M4x0.7 female thread by default to connect your load.
| Model | AirTAC SDA20X55S Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 55 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 male (B) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed NBR bumper (both ends) |
| Max standard stroke | Up to 90 mm |
Specifications follow the official AirTAC SDA compact-cylinder datasheet. Confirm against the product label before installation. Port thread: PT (standard). Rod: female thread (blank) / male thread (B).
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SDA | Compact (thin) double-acting cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| B | Male-thread piston rod (omit = female-thread rod). |
Thread: PT standard. Related SDA-family variants: SSA (single-acting push), STA (single-acting pull), SDAD (double rod), SDAJ (adjustable stroke), SDAT (duplex), SDAW (duplex-end).
Pushes a carrier plate into position under a routing spindle, utilizing the 157.1 N extend force and 55 mm travel to handle standard panel sizes.
Extends to tuck minor flaps prior to case sealing tape application, where the compact riveted body minimizes interference on narrow packaging conveyors.
Drives a metering valve for precise chemical dosing, using the -S magnet to trigger an electronic switch at the exact dispensing stroke end.
When sizing this 20 mm bore, stepping down to the SDA16 provides 100.5 N of push at 0.5 MPa, whereas stepping up to the SDA25 increases that output to 245.4 N. For the SDA20X55S configuration, verify your requirements for the 55 mm stroke, M5x0.8 port, and the -S magnet. The theoretical safe working load is approximately 94 N, translating to a vertical lift capacity of about 8 kg with a 2:1 safety margin.
Keep in mind that a standard double-acting cylinder drifts when air pressure is lost or the control valve centers. The fixed NBR bumper only slows the piston near the stroke ends and does not function as a locking brake. If your fixture must hold a load without live pressure, integrate an external rod lock or a pilot-operated check valve.
Quick checklist
This 20 mm bore double-acting cylinder generates 157.1 N push and 131.9 N pull at 0.5 MPa. At 0.7 MPa, push increases to 219.9 N. The theoretical maximum push force is 32 kgf at 1.0 MPa, with an operating pressure range of 0.15-1.0 MPa.
No adjustable air cushion is featured; the cylinder uses a fixed NBR bumper at each end to decelerate the piston. Additionally, it cannot hold a load if air is lost, as the bumper is not a brake. You will need an external shock absorber for high speeds and a pilot-operated check valve for position holding.
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