The AirTAC AirTAC SDA40X20SN Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 20mm stroke, PT1/8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA40X20SN is a double-acting, single-rod compact cylinder engineered to deliver 628.3 N of push force and 527.8 N of pull force at 0.5 MPa. Its riveted assembly merges the barrel, rear cover, piston, and rod into a highly shortened unit, drastically reducing axial footprint compared to conventional round-body designs.
This 40 mm bore model features a 16 mm piston rod and PT1/8 air ports. The S suffix equips the piston with a built-in magnet for direct mounting of AirTAC reed or electronic switches along the body grooves. End-stroke deceleration is handled by a fixed NBR bumper rather than an adjustable cushion, ensuring reliable stopping within tight machine envelopes.
| Model | AirTAC SDA40X20SN Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Double acting |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 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 120 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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).
Secures aluminum workpieces in a CNC machining center using the 628.3 N extend force, with the short 20 mm stroke keeping the fixture profile minimal.
Actuates side flaps on a continuous packaging line where the fixed NBR bumper absorbs the end-stop impact without requiring external adjustment.
Pushes parcels on a logistics conveyor, relying on the built-in magnet and electronic switch to confirm stroke position for the control system.
When sizing this actuator, evaluate your force requirements bidirectionally: stepping down to the SDA32 yields 402.1 N of push at 0.5 MPa, while stepping up to the SDA50 provides 981.7 N. For the SDA40X20SN, the safe working load is approximately 377 N (about 60% of the 628.3 N figure), translating to a vertical lift capacity of roughly 32 kg with a 2:1 safety margin. To finalize your order, confirm the 40 mm bore, 20 mm stroke, PT1/8 porting, female M8x1.25 rod-end thread, and the required magnetic switch.
Note that a standard compact cylinder cannot hold a load if air pressure drops or the valve is centered, as the piston will drift and the fixed bumper only decelerates near the stroke end. If your application demands position holding without live pressure, integrate an external rod lock or a pilot-operated check valve.
Quick checklist
This 40 mm bore double-acting cylinder generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum push force is 128 kgf at 1.0 MPa. It operates between 0.15 and 1.0 MPa, with a proof pressure of 1.5 MPa, and supports a speed range of 30-500 mm/s.
No, the SDA40X20SN uses a fixed NBR bumper at each end to decelerate the piston near the stroke limits. It is not an adjustable air cushion. For high-speed or high-energy cycles, you should slow the approach speed or install an external shock absorber.
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