Airtac STA Single Acting Compact Guided Cylinder STA25X20SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X20SB 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 STA25X20SB
The AirTAC STA25X20SB is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring extends it back out. It yields 177.7 N of net pull at 0.5 MPa, safely handling a working load of roughly 107 N or vertically lifting about 9.1 kg with a 2:1 margin. This thin riveted body saves axial mounting depth where larger profile cylinders cannot fit.
Equipped with a built-in piston magnet, this unit supports AirTAC reed or electronic solid-state switches for position sensing. The male M8x1.25 threaded rod end simplifies direct mechanical attachment, while the fixed NBR bumper decelerates the stroke end without acting as an adjustable lock.
Airtac STA Single Acting Compact Guided Cylinder STA25X20SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X20SB |
|---|---|
| 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 STA25X20SB
| 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 STA25X20SB Is Used
Gate Retraction
Uses the 177.7 N net pull to draw a diverter gate closed on a conveyor line, with the spring automatically opening it when air pressure drops.
Film Tensioning
Maintains steady tension on packaging film webs by pulling the dancer arm back against the material load during the wrapping cycle.
Carton Hold-Down
Pulls a hold-down pin to secure cardboard cartons at a labeling station, releasing the clamp via spring force once the cycle completes.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X20SB the Right Cylinder?
When sizing this 25 mm bore, compare its 177.7 N net pull at 0.5 MPa against the smaller STA20 which provides 108.9 N, or the larger STA32 delivering 290.1 N. The 20 mm stroke sits well below the 30 mm maximum standard limit for this series. Because the internal spring drives the rod to the extended rest position upon air loss, this cylinder cannot hold a mid-stroke load without external devices.
This specific configuration includes the -S magnet for switch sensing and the -B male M8x1.25 piston rod thread. Plumbing requires a single M5x0.8 port, and operation demands a minimum 0.2 MPa to overcome the return spring. Confirm your speed requirements fall within the 50-500 mm/s range.
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 STA25X20SB FAQ
This model provides a net pull force of 177.7 N at 0.5 MPa and 260.1 N at 0.7 MPa. The operating pressure range is 0.2-1.0 MPa, requiring at least 0.2 MPa to overcome the internal return spring.
No, it is a single-acting pull type where the spring drives the rod to the extended position upon air loss. It cannot hold a mid-stroke load; use a double-acting SDA with an external rod lock for that functionality.
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