The AirTAC AirTAC SDA20X55B 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 SDA20X55B is a double-acting, single-rod compact cylinder engineered for tight machinery footprints. Its riveted assembly shrinks axial mounting depth compared to round-body units, delivering a 157.1 N push at 0.5 MPa. This specific SKU features a male M6x1.0 threaded piston rod for direct load coupling, paired with an 8 mm rod diameter and an M5x0.8 air port.
Deceleration at the 55 mm stroke ends relies on a fixed NBR bumper rather than an adjustable air cushion. Because this configuration omits the -S magnet, it cannot host reed or electronic switches. Operating pressure spans 0.15-1.0 MPa, and the hard-anodized bore supports speeds from 30-500 mm/s.
| Model | AirTAC SDA20X55B 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).
Actuates the tooling head on a PCB depaneling machine, utilizing the 55 mm stroke and 94 N safe working load to separate circuit panels accurately.
Folds minor carton flaps on a continuous packaging line where the short riveted body minimizes axial intrusion into the conveyor framing.
Drives a precision fluid dispense valve using the male M6x1.0 rod end, applying controlled downward force for chemical reagent dosing.
When sizing this 20 mm bore, stepping down to the SDA16 yields 100.5 N of push at 0.5 MPa, while stepping up to the SDA25 provides 245.4 N. For this specific unit, a safe working load is approximately 94 N (about 60% of the 157.1 N figure), translating to a vertical lift capacity of roughly 8 kg with a 2:1 safety margin. Confirm your ordering essentials: 20 mm bore, 55 mm stroke, M5x0.8 port, male M6x1.0 rod thread, and no sensor magnet.
Note that a standard double-acting cylinder drifts when air pressure is lost or the valve is centered. The fixed NBR bumper only decelerates the piston near the stroke end and does not function as a locking brake. If your application requires strict position holding, integrate an external rod lock or a pilot-operated check valve.
Quick checklist
This double-acting cylinder generates a push of 157.1 N and a pull of 131.9 N at 0.5 MPa. At 0.7 MPa, the push is 219.9 N. The theoretical maximum push force is 32 kgf at 1.0 MPa, which is the maximum operating pressure.
No, this specific SKU lacks the internal piston magnet, so it cannot host reed or electronic switches. You would need the SDA20X55BS variant for sensing. Additionally, end-stop deceleration is handled by a fixed NBR bumper, not an adjustable air cushion.
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