Airtac STA Single Acting Compact Guided Cylinder STA25X25SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X25SB is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø25mm bore and 25mm 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
- Stroke25 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 STA25X25SB
The AirTAC STA25X25SB is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring pushes it back out. It yields 177.7 N of net pull at 0.5 MPa, reaching 260.1 N at 0.7 MPa. Because the quoted force is already net of the spring, you can size directly to these values without manual subtraction.
This unit includes a built-in piston magnet for AirTAC reed or electronic switches and a male M8x1.25 threaded rod end. The short riveted body saves axial mounting depth where a longer cylinder will not fit. A fixed NBR bumper decelerates the stroke end, operating effectively between 0.2 and 1.0 MPa.
Airtac STA Single Acting Compact Guided Cylinder STA25X25SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X25SB |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø25 mm |
| Stroke | 25 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 STA25X25SB
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 25 | Bore size in mm. |
| ×25 | 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 STA25X25SB Is Used
Tension Pull-Back
Uses the 177.7 N net pull to draw a tensioned belt or cable back to a home position, relying on the spring to maintain slack when air is removed.
Gate Return Mechanism
Closes a light diverter gate by pulling it shut with 260.1 N at 0.7 MPa, allowing the internal spring to push the gate open safely upon air loss.
Film Hold-Down
Retracts a clamping jaw to secure packaging film during a cut, with the male M8x1.25 rod providing a robust mounting point for the jaw assembly.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X25SB the Right Cylinder?
When sizing this 25 mm bore, compare it both ways: stepping down to the STA20 provides 108.9 N net pull at 0.5 MPa, while stepping up to the STA32 offers 290.1 N. For this model, a safe working load is roughly 107 N, allowing a vertical lift of about 9.1 kg with a 2:1 margin. The 25 mm stroke sits well below the 30 mm series ceiling.
Remember the spring-extend behaviour: if air pressure drops, the internal spring drives the rod out to its extended rest position, so it will not hold a mid-stroke load without live pressure or an external lock. This specific configuration confirms the 25 mm bore, 25 mm stroke, M5x0.8 port, built-in S magnet, and male B rod thread.
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 STA25X25SB FAQ
The net pull force is 177.7 N at 0.5 MPa and 260.1 N at 0.7 MPa. These values already account for the internal return spring, so no further force reduction is needed for the spring.
Air pressure retracts the rod, requiring at least 0.2 MPa to overcome the spring. When air is released, the spring extends the rod back out, meaning it cannot hold a mid-stroke load without external devices.
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