The AirTAC AirTAC SDA20X85SB 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 SDA20X85SB 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, making it highly effective for machinery where a standard round-body unit would be too long. The unit includes a built-in piston magnet for position sensing and a male M6x1.0 threaded rod end for straightforward load coupling.
This model relies on a fixed NBR bumper at each end to decelerate the piston near stroke completion rather than an adjustable air cushion. The hard-anodized 20 mm bore operates at speeds between 30 and 500 mm/s. Because the 85 mm stroke approaches the 100 mm maximum standard stroke for this bore size, ensuring adequate side-load support is critical for the 8 mm rod.
| Model | AirTAC SDA20X85SB 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 flap on a logistics sorting line, utilizing the 85 mm stroke and 157.1 N push force to redirect small parcels at high throughput.
Extends a male M6x1.0 threaded pin to secure circuit boards during wave soldering, where the compact riveted body minimizes axial footprint inside the fixture.
Drives a short mechanical arm to tuck minor flaps on a case erector, relying on the fixed NBR bumper to absorb the end-stop impact without external adjustments.
When sizing this 20 mm bore, stepping down to the SDA16 yields 100.5 N of push force at 0.5 MPa, while stepping up to the SDA25 provides 245.4 N. For this specific configuration, the safe working load is approximately 94 N (about 60% of the 157.1 N figure), allowing a vertical lift of roughly 8 kg with a 2:1 safety margin. If your application must maintain a vertical position without live air pressure, note that this cylinder will drift; an external rod lock or pilot-operated check valve is required to hold the load. Confirm your ordering essentials: 20 mm bore, 85 mm stroke, M5x0.8 port, built-in magnet (S), and male M6x1.0 rod thread (B).
Quick checklist
At 0.5 MPa, this double-acting cylinder provides 157.1 N of push force and 131.9 N of pull force. At 0.7 MPa, push increases to 219.9 N and pull to 184.7 N. The theoretical maximum push force is 32 kgf at 1.0 MPa, which is the maximum operating pressure.
Yes, the built-in magnet (-S) is fully compatible with AirTAC reed or electronic switches mounted in the body grooves. Additionally, the -B option means the 8 mm piston rod features a male M6x1.0 thread for direct mounting, rather than the default female M4x0.7 thread.
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