Airtac STA Single Acting Compact Guided Cylinder STA25X20
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X20 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø25mm 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.
- BoreØ25 mm
- Stroke20 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM5×0.8 (F) / M8×1.25 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA25X20
The AirTAC STA25X20 is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it out. It provides 177.7 N of net pull at 0.5 MPa and 260.1 N at 0.7 MPa, with the spring force already subtracted from the rating. This makes it inherently fail-safe to the extended position upon air loss.
Featuring a short riveted body, this unit saves axial mounting depth where round-body or profile cylinders cannot fit. It runs on a single M5x0.8 air port and uses a fixed NBR bumper to decelerate the stroke end. Because this specific SKU lacks the -S magnet option, it cannot accept reed or electronic switches.
Airtac STA Single Acting Compact Guided Cylinder STA25X20 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X20 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø25 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull type |
| Port size | M5×0.8 |
| Rod end thread | M5×0.8 female / M8×1.25 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 (Ø25mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 178 N |
| 0.7 MPa | 260 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 STA25X20
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 25 | 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 STA25X20 Is Used
Tensioning Systems
Uses the 177.7 N net pull to draw belts or cables taut, relying on the internal spring to automatically slacken the line when air pressure drops.
Gate Diversion
Pulls a diverter gate out of the product flow path on demand, letting the fixed NBR bumper absorb the shock of the spring-extended rest position.
Flap Hold-Down
Holds carton flaps open during filling by pulling a mechanical arm back, then releases the arm so the spring snaps it clear for sealing.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X20 the Right Cylinder?
When sizing this model, consider the neighboring bores: stepping down to the STA20 yields 108.9 N net pull at 0.5 MPa, while stepping up to the STA32 provides 290.1 N. For the STA25X20, a safe working load is roughly 107 N (about 60 percent of the 177.7 N figure), allowing a vertical lift of approximately 9.1 kg with a 2:1 margin.
This 20 mm stroke sits well below the 30 mm single-acting ceiling. Remember that the spring drives the rod out when air is released, so it will not hold a mid-stroke load without live pressure or an external lock. Confirm your requirements for the 25 mm bore, 20 mm stroke, M5x0.8 port, female M5x0.8 rod thread, and lack of a magnet before ordering.
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 STA25X20 FAQ
The net pull force is 177.7 N at 0.5 MPa and 260.1 N at 0.7 MPa. These figures already account for the internal return spring resistance, meaning the spring force is already subtracted from the pneumatic output.
No, this specific SKU does not include a piston magnet. To use AirTAC reed or electronic switches, you must select the -S variant. Additionally, it requires at least 0.2 MPa of operating pressure to overcome the return spring.
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