Airtac STA Single Acting Compact Guided Cylinder STA20X25SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X25SB is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm 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.
- BoreØ20 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA20X25SB
The AirTAC STA20X25SB is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring pushes it back out. At 0.5 MPa it generates 108.9 N of net pull, scaling to 161.7 N at 0.7 MPa. Because the spring handles the extension stroke, you only need one M5x0.8 air line and one solenoid port to operate it.
This specific configuration includes a built-in piston magnet for position sensing alongside a male M6x1.0 threaded rod end. The short riveted body saves valuable axial mounting depth in tight machinery. It relies on a fixed NBR bumper to decelerate the stroke end rather than an adjustable cushion.
Airtac STA Single Acting Compact Guided Cylinder STA20X25SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X25SB |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| 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 | 0.2 – 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 (Ø20mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 109 N |
| 0.7 MPa | 162 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 STA20X25SB
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | 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 STA20X25SB Is Used
Tension Gate Control
Uses the 108.9 N net pull to retract a guide gate against spring pressure, automatically opening the passage when air pressure drops.
Film Roll Hold-Down
Pulls a tensioning arm in to secure wrapping material during cycling, relying on the internal spring to release the load cleanly.
Short-Stroke Clamping
Draws a small fixture back with its male M6 rod to clear a workspace, letting the spring extend the clamp safely when pneumatic signal stops.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X25SB the Right Cylinder?
When sizing this unit, consider the neighboring bores: stepping down to STA16 yields 66.4 N net pull at 0.5 MPa, while stepping up to STA25 provides 177.7 N. For the STA20X25SB, a safe working load is roughly 65 N (about 60 percent of the 0.5 MPa figure), allowing a vertical lift of approximately 5.6 kg with a 2:1 safety margin.
Remember the 30 mm standard stroke ceiling and that the spring drives the rod to its extended rest position on air loss, meaning it cannot hold a mid-stroke load without external locking. This model features a 20 mm bore, 25 mm stroke, M5x0.8 port, an -S magnet for reed or electronic switches, and a male M6x1.0 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 STA20X25SB FAQ
This cylinder provides a net pull force of 108.9 N at 0.5 MPa and 161.7 N at 0.7 MPa. It requires an operating pressure of 0.2 to 1.0 MPa, as at least 0.2 MPa is needed to overcome the internal return spring.
Air pressure retracts the rod while the internal spring extends it back out. The included -S magnet allows you to track position with AirTAC reed or electronic switches. If air is lost, the spring forces the rod to its extended state.
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