The AirTAC AirTAC SDA20X40SB 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 SDA20X40SB is a double-acting single-rod compact cylinder engineered for tight axial spaces. A riveted assembly unites the barrel, rear cover, piston, and rod to minimize mounting depth, yielding a 157.1 N push force at 0.5 MPa. The bore is hard-anodized and uses a two-way piston seal for reliable pneumatics. This specific unit includes a built-in piston magnet (-S) for position sensing and a male-thread piston rod (-B).
Equipped with an 8 mm piston rod and an M5x0.8 air port, it operates at speeds between 30 and 500 mm/s. Instead of an adjustable air cushion, the ends feature a fixed NBR bumper to decelerate the stroke. Grooves around the body accept AirTAC reed or electronic switches, enabling precise end-of-stroke detection when paired with the internal magnet.
| Model | AirTAC SDA20X40SB 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).
Actuates the tooling head on an electronic board depaneling machine, utilizing the male M6 rod end for secure cutter mounting within a compact footprint.
Folds minor flaps on a packaging line where the 40 mm stroke and 157.1 N extension force provide sufficient push without excessive axial bulk.
Indexes a liquid dispensing valve over microplate wells, using the built-in magnet with a solid-state switch to confirm injection depth.
When sizing this 20 mm bore actuator, consider stepping down to the SDA16 which provides 100.5 N push at 0.5 MPa, or moving up to the SDA25 which yields 245.4 N push at 0.5 MPa. Based on the 157.1 N output at 0.5 MPa, the safe working load is roughly 94 N (about 60% capacity), translating to a vertical lift capability of approximately 8 kg with a 2:1 safety margin. To order, confirm the 20 mm bore, 40 mm stroke, M5x0.8 port, male M6x1.0 rod thread, and the required magnetic sensor. Note that a standard cylinder drifts if air pressure drops or the valve is centered; the fixed bumper only decelerates near stroke end and does not function as a lock. For suspended loads, integrate an external rod lock or pilot-operated check valve.
Quick checklist
This 20 mm bore 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 and the pull is 184.7 N. The theoretical maximum push force is 32 kgf at 1.0 MPa.
No, the SDA20X40SB uses a fixed NBR bumper at each end to decelerate the piston, not an adjustable air cushion. For high kinetic energy or rapid cycling, you should slow the approach speed or install an external shock absorber.
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