The AirTAC AirTAC SDA20X70S Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 70mm 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 SDA20X70S is a double-acting, single-rod compact cylinder engineered to deliver 157.1 N of push force and 131.9 N of pull force at 0.5 MPa. Its riveted body design integrates the barrel, rear cover, and piston into a highly unified structure, drastically reducing axial mounting depth compared to conventional round-body units. The 20 mm bore features a hard-anodized inner wall and an 8 mm piston rod, operating at speeds between 30 and 500 mm/s.
This specific configuration includes a built-in piston magnet (-S) for position sensing via AirTAC reed or electronic switches mounted in the body grooves. End-of-stroke deceleration is handled by fixed NBR bumpers rather than adjustable air cushions, meaning external shock absorbers should be added for high-energy cycles. The M5x0.8 port and 70 mm stroke make it well-suited for tight machinery footprints requiring a mid-range extension.
| Model | AirTAC SDA20X70S Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 70 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. |
| ×70 | 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).
Deploys the 70 mm stroke to push separated circuit boards from a routing fixture, utilizing the 8 kg vertical lift capacity to clear the tooling bed reliably.
Actuates side flaps on a small product carton sealing line, where the 157.1 N push force easily overcomes cardboard resistance within a narrow machine frame.
Extends a guide arm to deflect lightweight parcels between adjacent conveyor belts, relying on the built-in magnet to confirm diversion status via a reed or electronic switch.
When sizing this actuator, note that the SDA16 bore provides 100.5 N of push force at 0.5 MPa, while the larger SDA25 bore offers 245.4 N at the same pressure, allowing you to step up or down depending on your exact load requirements. For the SDA20X70S, the practical 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. To finalize your order, confirm the 20 mm bore, 70 mm stroke, M5x0.8 port, female M4x0.7 rod thread, and the required -S magnet option.
Keep in mind that a standard double-acting cylinder does not inherently hold its position if air pressure is lost or the directional valve is centered. The piston will drift under load, and the fixed NBR bumper only decelerates the stroke near the end points without acting as a mechanical lock. If your application demands strict position holding without live pressure, you must integrate an external rod lock or a pilot-operated check valve into the pneumatic circuit.
Quick checklist
This 20 mm bore double-acting cylinder generates 157.1 N push and 131.9 N pull at 0.5 MPa, increasing to 219.9 N push and 184.7 N pull at 0.7 MPa. The theoretical maximum push force is 32 kgf at 1.0 MPa. It operates within a pressure range of 0.15-1.0 MPa, has a proof pressure of 1.5 MPa, and functions in temperatures from -20 to +70 C.
It uses fixed NBR bumpers at both ends to decelerate the piston, which is not an adjustable air cushion and cannot hold a load if air pressure drops. For high-speed applications, adding an external shock absorber is advised. The -S option provides a built-in magnet for track-mounted AirTAC reed or electronic switches.
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