The AirTAC AirTAC SDA20X40N 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 SDA20X40N is a double-acting, single-rod compact cylinder engineered for tight machinery footprints. Its riveted assembly yields a very short axial length, delivering 157.1 N of push force at 0.5 MPa alongside an 8 mm piston rod. This space efficiency makes it ideal for mounting in shallow frames where longer profile or round-body units fail to fit.
This unit relies on a fixed NBR bumper at each end to decelerate the stroke, rather than an adjustable air cushion. Operating at speeds of 30-500 mm/s, it features an M5x0.8 port and a female M4x0.7 rod-end thread. Note that this specific SKU lacks a piston magnet, so it cannot host magnetic switches without upgrading to an -S variant.
| Model | AirTAC SDA20X40N 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).
Provides a short 40 mm kick to push singulated circuit boards from a routing fixture, utilizing the compact 20 mm body to fit within dense electronics assembly machinery.
Drives a small mechanical finger to tuck minor flaps on small pharmaceutical cartons, where the 157.1 N extend force is sufficient and axial depth is highly restricted.
Actuates a lightweight routing flap on a conveyor line to redirect small plastic parts, benefiting from the 30-500 mm/s speed range to maintain high throughput.
When sizing this 20 mm bore actuator, compare its 157.1 N push at 0.5 MPa against adjacent options: step down to the SDA16 for 100.5 N, or up to the SDA25 for 245.4 N. A computed safe working load is roughly 94 N (about 60% of the 0.5 MPa figure), translating to a vertical lift of approximately 8 kg with a 2:1 safety margin. To finalize your order, confirm the 40 mm stroke, M5x0.8 port, female M4x0.7 rod thread, and the absence of a sensor magnet. If your application must hold a load during air loss or valve centering, note that this cylinder will drift; you must integrate an external rod lock or pilot-operated check valve.
Quick checklist
This double-acting cylinder generates 157.1 N push and 131.9 N pull at 0.5 MPa, and 219.9 N push at 0.7 MPa. Its theoretical maximum push force is 32 kgf at 1.0 MPa, with a proof pressure of 1.5 MPa.
No, this specific SKU does not include a piston magnet, so it cannot trigger AirTAC reed or electronic switches. You would need the -S option code to enable sensing. Additionally, it uses fixed NBR bumpers for end-stop deceleration, not an adjustable cushion.
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