The AirTAC AirTAC SDA20X85B 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 SDA20X85B 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. Its riveted body assembly significantly reduces axial mounting depth compared to round-body alternatives, making it highly effective for machinery where space footprint is critical. The unit features an 8 mm piston rod and utilizes a hard-anodized bore with a two-way piston seal for reliable pneumatic operation.
This specific configuration includes an 85 mm stroke and a male M6x1.0 threaded rod end (denoted by the B option) for direct load coupling, replacing the standard female M4x0.7 thread. End-stop deceleration is handled by a fixed NBR bumper rather than an adjustable air cushion, meaning operators should reduce approach speeds or add external shock absorbers for high-energy loads. Because this SKU lacks the S magnet option, it cannot host AirTAC reed or electronic switches.
| Model | AirTAC SDA20X85B 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).
Pushes lightweight cardboard cartons on a sorting line using 157.1 N of extend force, with the 85 mm travel providing ample reach to clear the belt edge.
Utilizes the male M6x1.0 rod end to mount a delrin guide finger, positioning circuit boards laterally within an SMT placement machine.
Maintains precise web tension in a vertical packaging film roll stand, moving 85 mm to compensate for material roll diameter changes.
When sizing this 20 mm bore actuator, evaluate your force margins carefully. Stepping down to the SDA16 reduces the 0.5 MPa push capacity to 100.5 N, whereas stepping up to the SDA25 increases it to 245.4 N. For the SDA20X85B, the safe working load is approximately 94 N (about 60% of the 157.1 N figure), translating to a vertical lift capability of roughly 8 kg with a 2:1 safety margin. To finalize your order, confirm the 20 mm bore, 85 mm stroke, M5x0.8 port, male M6x1.0 rod thread, and the absence of a sensor magnet. Note that a plain compact cylinder will drift and cannot hold a load if air pressure drops or the valve is centered; applying an external rod lock or pilot-operated check valve is necessary for position holding.
Quick checklist
At 0.5 MPa, the push force is 157.1 N and the pull force is 131.9 N. At 0.7 MPa, the push force is 219.9 N. The theoretical maximum push force is 32 kgf at 1.0 MPa. The operating pressure range is 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and the operational speed range spans 30-500 mm/s.
No, end-of-stroke deceleration relies on a fixed NBR bumper, which is not an adjustable air cushion. Additionally, because this SKU lacks the S magnet option, it cannot support AirTAC reed or electronic switches. If your application requires position sensing, you must select the SDA20X85BS variant.
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