The AirTAC AirTAC SDA20X70SB 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 SDA20X70SB 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 assembly significantly reduces axial mounting depth compared to conventional round-body units, making it ideal for tight machine footprints. The unit includes a built-in piston magnet (-S) for position sensing and a male M6x1.0 threaded rod end (-B) for secure load coupling.
Instead of an adjustable air cushion, the bore relies on a fixed NBR bumper at each end to decelerate the stroke. Because the piston drifts when air pressure is lost or a valve centers, an external rod lock or pilot-operated check valve is required if your application must hold a load securely. The hard-anodized inner wall and two-way piston seal ensure durable, consistent linear motion.
| Model | AirTAC SDA20X70SB 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).
Actuates the cutting head alignment gate on an electronics depaneling machine, utilizing the 70 mm stroke and male M6 rod to push the board carrier firmly into the start position.
Folds the minor flaps on small pharmaceutical cartons on a high-speed packaging line, where the compact riveted body saves critical axial space within the narrow folding turret.
Indexes a pipetting head over a microplate tray, using the built-in magnet with a reed or electronic switch to confirm the exact 70 mm extension before fluid dispensing begins.
When sizing this 20 mm bore actuator, consider stepping down to the SDA16 which yields 100.5 N of push at 0.5 MPa for lighter duties, or stepping up to the SDA25 which provides 245.4 N if your mechanism requires greater thrust. At 0.5 MPa, this SDA20 configuration provides a safe working load of roughly 94 N (about 60% of its rated output) and can vertically lift approximately 8 kg with a 2:1 safety margin.
To finalize your order, confirm the 20 mm bore, 70 mm stroke, M5x0.8 air port, and the specific -S magnet and -B male M6x1.0 rod end options. Operating speed spans 30-500 mm/s, but for high-velocity cycles, consider slowing the approach or adding an external shock absorber since the standard bumper is not field-adjustable.
Quick checklist
This double-acting 20 mm bore cylinder generates 157.1 N push and 131.9 N pull at 0.5 MPa, and 219.9 N push at 0.7 MPa. Its theoretical maximum push force is 32 kgf at 1.0 MPa. It operates between 0.15-1.0 MPa with a speed range of 30-500 mm/s.
No, a standard compact 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 act as a lock or brake. To maintain vertical position without live pressure, you must install an external rod lock or a pilot-operated check valve.
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