The AirTAC AirTAC SDA20X85S 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 SDA20X85S is a double-acting single-rod compact cylinder engineered for tight axial spaces. It generates 157.1 N of push force and 131.9 N of pull force at 0.5 MPa. The riveted unibody design significantly reduces mounting depth compared to conventional round-body units, making it highly effective for machinery with strict footprint limits.
This specific model includes a built-in piston magnet (-S) for direct mounting of AirTAC reed or electronic switches along the body grooves. End-of-travel deceleration is handled by a fixed NBR bumper rather than an adjustable cushion, and the hard-anodized 20 mm bore pairs with an M5x0.8 port and an 8 mm rod to support a safe working load of roughly 94 N.
| Model | AirTAC SDA20X85S 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 a routing blade carriage across an 85 mm travel path to singulate printed circuit boards, utilizing the short body to minimize Z-axis height.
Pushes lightweight parcels from a main conveyor belt onto a secondary gravity chute using 157.1 N of extend force at 0.5 MPa.
Drives a pipette head down into microplates, where the integrated magnet allows electronic switches to confirm the exact fluid dispensing position.
When sizing this 20 mm bore unit, stepping down to the SDA16 yields 100.5 N of push at 0.5 MPa, while stepping up to the SDA25 provides 245.4 N. This SDA20X85S configuration features an 85 mm stroke (within the 100 mm standard limit for this bore), an M5x0.8 port, and a female M4x0.7 rod-end thread. Because it is a double-acting cylinder, it relies on continuous air pressure; if your valve centers or air supply drops, the piston will drift and the bumper cannot lock the load. An external rod lock or pilot-operated check valve is required to hold a vertical load of approximately 8 kg safely in place without live pressure.
Quick checklist
At 0.5 MPa, this double-acting cylinder provides 157.1 N of push and 131.9 N of pull. At 0.7 MPa, push increases to 219.9 N and pull to 184.7 N. The theoretical maximum push is 32 kgf at 1.0 MPa, which is the maximum operating pressure.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not a field-adjustable air cushion. For high-speed cycling, you should add an external shock absorber. The -S suffix denotes a built-in magnet designed to trigger AirTAC reed or electronic switches mounted in the body grooves.
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