Airtac STA Single Acting Compact Guided Cylinder STA40X20
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X20 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø40mm bore and 20mm stroke. Air pulles the rod and an internal spring returns it, so one solenoid line drives the motion — ideal for short-stroke clamping and ejection in tight spaces.
- BoreØ40 mm
- Stroke20 mm
- Port sizePT1/8
- Acting typeSingle acting, pull type
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA40X20
The AirTAC STA40X20 is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring pushes it back out. It yields 445.1 N of net pull at 0.5 MPa and 656.2 N at 0.7 MPa, with the spring force already subtracted from the total. This normally-extended actuator fails safely to its extended state upon air loss.
Its short riveted body drastically cuts axial mounting depth where standard round-body or larger profile cylinders cannot fit. The unit relies on a fixed NBR bumper to decelerate the stroke end, operating at speeds between 50 and 500 mm/s. It requires a minimum operating pressure of 0.2 MPa to overcome the internal spring.
Airtac STA Single Acting Compact Guided Cylinder STA40X20 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X20 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull type |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 male (B) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 500 mm/s |
| Cushion | Fixed NBR bumper |
| Max standard stroke | Up to 30 mm |
Specifications follow the official AirTAC SDA-family datasheet. Single-acting types start at 0.2 MPa (the spring must be overcome). Confirm against the product label before installation.
Net Output Force (Ø40mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 445 N |
| 0.7 MPa | 656 N |
These are NET output forces — the return-spring force is already deducted. Single-acting pull only; the spring performs the opposite stroke. Size with a safety margin.
Model Code: Airtac STA Single Acting Compact Guided Cylinder STA40X20
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | Stroke length in mm (single-acting max 30 mm). |
| S | Built-in magnet for magnetic-switch sensing (omit = none). |
| B | Male-thread piston rod (omit = female thread). |
Thread: PT standard. SSA pushes out / spring returns; STA pulls in / spring extends. Related: SDA (double acting), SDAD (double rod), SDAJ (adjustable stroke).
Where the Airtac STA Single Acting Compact Guided Cylinder STA40X20 Is Used
Tensioning Web Material
Uses the 445.1 N net pull at 0.5 MPa to draw back a tensioning roller, relying on the internal spring to maintain baseline tension when air is vented.
Pneumatic Gate Return
Pulls a diverter gate closed on command, allowing the spring to automatically push the gate open and clear the lane during an air pressure loss.
Hold-Down Clamp Release
Retracts a clamping pin out of the way for carton loading, with the spring extending the pin to secure the package during the sealing cycle.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X20 the Right Cylinder?
When sizing this 40 mm bore actuator, compare its 445.1 N net pull at 0.5 MPa against adjacent bores: the STA32 provides 290.1 N, while the STA50 offers 717.7 N. This yields a safe working load of roughly 267 N (about 60 percent of the 0.5 MPa rating) and a vertical lift capacity near 22.7 kg with a 2:1 safety margin.
Remember the 30 mm maximum standard stroke ceiling and that the spring-extend design cannot hold a mid-stroke load without live pressure. This specific STA40X20 configuration has no piston magnet, so it cannot accept sensing switches; adding the S option enables reed or electronic detection. The 16 mm rod uses an M8x1.25 female thread, and the port is PT1/8.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Stroke ≤ 30 mm (single-acting limit)
- ✓ Single air line saves a valve/port
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 1.0 MPa operating pressure.
- check Remember the spring performs the return stroke.
- check Avoid side load on the short piston rod.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac STA Single Acting Compact Guided Cylinder STA40X20 FAQ
The STA40X20 provides a net pull force of 445.1 N at 0.5 MPa and 656.2 N at 0.7 MPa. These figures already account for the internal return spring resistance.
No, the spring drives the rod to its extended rest position on air loss, so it cannot lock a mid-stroke load. It also requires at least 0.2 MPa of air pressure to overcome the spring and retract the rod.
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