Airtac SDA Ultra Thin Cylinder SDA20X40
The AirTAC Airtac SDA Ultra Thin Cylinder SDA20X40 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.
- BoreØ20 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SDA Ultra Thin Cylinder SDA20X40
The AirTAC SDA20X40 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 assembly securely joins the barrel, rear cover, piston, and rod, yielding an exceptionally short axial footprint where a conventional round-body unit would never fit. The hard-anodized bore minimizes friction, while the unit operates smoothly across a 30-500 mm/s speed range.
This specific SKU features an 8 mm piston rod and a female M4x0.7 rod-end thread, utilizing an M5x0.8 port. End-stop deceleration relies strictly on a fixed NBR bumper, which absorbs impact energy but is not a field-adjustable air cushion. Note that this base configuration omits the piston magnet, so it cannot host position sensing without upgrading to the -S variant.
Airtac SDA Ultra Thin Cylinder SDA20X40 Technical Specifications
| Model | Airtac SDA Ultra Thin Cylinder SDA20X40 |
|---|---|
| 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).
Theoretical Output Force (Ø20mm)
| 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.
Model Code: Airtac SDA Ultra Thin Cylinder SDA20X40
| 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).
Where the Airtac SDA Ultra Thin Cylinder SDA20X40 Is Used
PCB Depanelling Ejector
Uses the 157.1 N extend force to push singulated circuit boards out of a routing fixture, where the 40 mm stroke clears the workpiece without consuming excessive Z-axis height.
Carton Flap Folder
Actuates a short mechanical arm to tuck minor flaps on small primary packaging lines, benefiting from the compact riveted body to fit within tight side-frame clearances.
Lab Dispenser Tip Alignment
Positions a fluid nozzle over microplate wells with a 40 mm travel, leveraging the 8 mm rod and fixed NBR bumpers to ensure repeatable bottoming without complex shock tuning.
Is the Airtac SDA Ultra Thin Cylinder SDA20X40 the Right Cylinder?
When sizing this actuator, evaluate your force requirements bidirectionally: stepping down to the SDA16 provides 100.5 N of push at 0.5 MPa, whereas stepping up to the SDA25 yields 245.4 N. For the SDA20X40, a safe working load is approximately 94 N (about 60% of the 157.1 N figure), translating to a vertical lift capacity near 8 kg with a 2:1 safety margin. Confirm your ordering essentials: 20 mm bore, 40 mm stroke, M5x0.8 port, female rod thread, and no magnet.
Because this is a standard double-acting cylinder, it will not hold a load if air pressure drops or the directional valve centers; the piston drifts, and the fixed NBR bumper only decelerates near the stroke end rather than locking the rod. If your fixture demands fail-safe positioning, incorporate an external rod lock or a pilot-operated check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short-body depth vs. a round-body cylinder
- ✓ Port/thread type (PT)
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
- ✓ Side load — avoid on a compact rod
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the short piston rod.
- check Very long strokes are unsuitable for the compact body.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac SDA Ultra Thin Cylinder SDA20X40 FAQ
The SDA20X40 generates 157.1 N push and 131.9 N pull at 0.5 MPa, increasing to 219.9 N push and 184.7 N pull at 0.7 MPa. The theoretical maximum push is 32 kgf at 1.0 MPa. Operating pressure spans 0.15-1.0 MPa, with a proof pressure of 1.5 MPa and a speed range of 30-500 mm/s.
No, this model uses a fixed NBR bumper at each end to decelerate the stroke, which cannot be field-adjusted like an air cushion; for high-energy cycles, slow the approach or add an external shock absorber. Additionally, this SKU lacks a piston magnet, so it cannot accept reed or electronic switches unless you specify the -S option.
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