The AirTAC AirTAC SDA20X85 Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 85mm 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 SDA20X85 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. Featuring a hard-anodized bore and a two-way piston seal, this unit provides a safe working load of roughly 94 N (about 60% of the 0.5 MPa push figure) and can vertically lift approximately 8 kg with a 2:1 safety margin.
Its short riveted body drastically reduces axial mounting depth compared to conventional round-body units, making it ideal for tight machine footprints. The stroke end is decelerated by a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or add an external shock absorber for high-energy cycles. This specific SKU lacks a piston magnet, so it cannot host magnetic switches without upgrading to the -S option.
| Model | AirTAC SDA20X85 Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 85 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. |
| ×85 | 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 guide on an electronic PCB depaneling machine, utilizing the 85 mm stroke to traverse the board edge while keeping the equipment footprint minimal.
Drives the mechanical flap tucker arm on a carton sealing conveyor, providing 157.1 N of push at 0.5 MPa to fold corrugated flaps prior to tape application.
Moves a pipetting head vertically to dispense reagents into test tubes, where the short body depth allows multiple cylinders to be mounted tightly on a crowded analysis carousel.
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 moving up to the SDA25, which provides 245.4 N at 0.5 MPa if your payload demands more thrust. To order this exact configuration, confirm the 20 mm bore, 85 mm stroke, M5x0.8 port, female M4x0.7 rod-end thread, and the absence of a sensor magnet.
Because this is a standard double-acting cylinder, it will not hold a load if air pressure drops or the valve centers—the piston will drift, as the fixed NBR bumper only decelerates near the stroke end and acts as neither a lock nor a brake. To maintain vertical position without live pressure, integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
Quick checklist
This double-acting 20 mm bore cylinder provides 157.1 N push and 131.9 N pull at 0.5 MPa, and 219.9 N push at 0.7 MPa. The theoretical maximum push is 32 kgf at 1.0 MPa. It operates on filtered air at 0.15-1.0 MPa, runs at 30-500 mm/s, and functions in environments from -20 to +70 C.
No, this specific SKU does not include a piston magnet, so it cannot trigger AirTAC reed or electronic switches. The body does feature the standard sensor grooves, but you must specify the -S option (e.g., SDA20X85S) to add the internal magnet required for position sensing.
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