The AirTAC AirTAC SDA20X40S Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 40mm 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 SDA20X40S is a double-acting single-rod compact cylinder engineered for tight spaces, delivering 157.1 N of push force and 131.9 N of pull force at 0.5 MPa. Its riveted assembly merges the barrel, rear cover, piston, and rod to drastically reduce axial mounting depth compared to round-body alternatives. The 20 mm bore features a hard-anodized inner wall and a two-way piston seal for reliable service.
Equipped with a built-in piston magnet (-S), this unit supports position sensing via AirTAC reed or electronic switches mounted in the body grooves. Travel termination relies on a fixed NBR bumper at each end rather than an adjustable air cushion, meaning external shock absorbers should be added for high-energy impacts. The 8 mm rod end provides a female M4x0.7 thread for straightforward load coupling.
| Model | AirTAC SDA20X40S Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 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. |
| ×40 | 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 at 0.5 MPa required to actuate the Z-axis cutting head on a printed circuit board routing machine, fitting neatly within the electronics assembly cell.
Drives the upper heat platen of a small medical blister packaging sealer, utilizing the 40 mm stroke and fixed NBR bumpers to maintain consistent downward pressure.
Actuates a pneumatic pinch valve for viscous reagent dispensing, using the integrated magnet to trigger an electronic switch for precise volumetric metering.
When sizing this actuator, evaluate your neighbours: 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. For the SDA20X40S, 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. Ensure your ordering essentials cover the 20 mm bore, 40 mm stroke, M5x0.8 port, required female M4x0.7 rod thread, and the integrated magnet.
Remember that a standard compact cylinder cannot hold a load if air pressure drops or the valve is centered—the piston will drift. The fixed NBR bumper only decelerates the stroke near its limits and does not function as a mechanical lock. If your application requires static holding without live pressure, incorporate an external rod lock or a pilot-operated check valve.
Quick checklist
This 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. Operating pressure spans 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and the speed range is 30-500 mm/s.
No, the SDA20X40S uses a fixed NBR bumper at each end to decelerate the piston near stroke completion. It is not an adjustable air cushion. For high-speed or high-energy cycles, you should slow the approach speed or install an external shock absorber to prevent damage.
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