The AirTAC AirTAC SDA20X55SB 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 SDA20X55SB is a double-acting, single-rod compact cylinder engineered for tight machinery footprints. Its riveted body assembly significantly reduces axial mounting depth compared to round-body alternatives, yielding a push force of 157.1 N at 0.5 MPa. This specific configuration includes a built-in piston magnet and a male M6x1.0 threaded rod end for direct load coupling.
The 20 mm bore features a hard-anodized inner wall and operates at speeds between 30 and 500 mm/s. End-of-stroke deceleration is handled by a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or utilize external shock absorbers for high-energy loads. Grooves around the body accept AirTAC reed or electronic switches to track position.
| Model | AirTAC SDA20X55SB 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).
Provides the 157.1 N push stroke needed to eject separated circuit boards from a routing fixture without damaging delicate surface-mount components.
Drives the mechanical arm that tucks minor flaps on small product cartons prior to tape sealing, fitting neatly within the narrow side frame of the packaging line.
Actuates a precision valve head for chemical reagent dispensing, using the male M6 rod end to securely mount the fluid nozzle assembly.
When sizing this actuator, evaluate your force margins carefully. Stepping down to the SDA16 yields 100.5 N of push at 0.5 MPa, while moving up to the SDA25 provides 245.4 N at the same pressure. For the SDA20X55SB, the 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, 55 mm stroke, M5x0.8 port, male M6 rod thread, and the required magnetic sensor.
Remember that a standard compact cylinder does not maintain its position if air pressure drops or the directional valve is centered. The piston will drift, and the fixed NBR bumper only decelerates the stroke near its end without acting as a lock. If your application demands fail-safe load holding, 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 a push force of 157.1 N and a pull force of 131.9 N at 0.5 MPa. At 0.7 MPa, the push increases to 219.9 N. The theoretical maximum push force is 32 kgf at 1.0 MPa. It operates within a pressure range of 0.15-1.0 MPa and a speed range of 30-500 mm/s.
It includes a built-in piston magnet (-S) for use with AirTAC reed or electronic switches, but it does not feature adjustable air cushions. End-stroke deceleration is provided by a fixed NBR bumper. For high-speed applications, you should slow the approach speed or add an external shock absorber to absorb kinetic energy.
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