Airtac STA Single Acting Compact Guided Cylinder STA25X5B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X5B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø25mm bore and 5mm 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
- Stroke5 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 STA25X5B
The AirTAC STA25X5B is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it back out. It yields 177.7 N of net pull at 0.5 MPa, making it suitable for short 5 mm tensioning or hold-down tasks. Because the return spring constantly pushes, the unit normally rests extended and fails safely to that outward position if air pressure drops.
This thin riveted-body design saves axial mounting depth where larger profile cylinders cannot fit. It features a male M8x1.25 piston rod end and an M5x0.8 air port. End-of-stroke energy is managed by a fixed NBR bumper, which decelerates the motion but is not an adjustable cushion or a locking brake.
Airtac STA Single Acting Compact Guided Cylinder STA25X5B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X5B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø25 mm |
| Stroke | 5 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 STA25X5B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 25 | Bore size in mm. |
| ×5 | 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 STA25X5B Is Used
Film Web Tensioning
Uses the 177.7 N net pull to maintain steady tension on a packaging film web, with the spring extending to release the load during stoppages.
Pneumatic Hold-Down Pin
Pulls a locating pin out of the way via the male M8 thread to clear a workpiece, letting the internal spring snap it back into position.
Diverter Gate Return
Air retracts the 5 mm stroke to open a conveyor diverter, and the spring automatically closes the gate to a fail-safe resting state.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X5B the Right Cylinder?
When sizing this 25 mm bore actuator, compare its 177.7 N net pull at 0.5 MPa against adjacent options. Stepping down, the STA20 provides 108.9 N, while stepping up to the STA32 yields 290.1 N. A safe working load is approximately 107 N (about 60 percent of the 0.5 MPa figure), allowing a vertical lift of roughly 9.1 kg with a 2:1 safety margin.
Remember the 30 mm maximum stroke ceiling for this series and that the spring drives the rod out when air is released, meaning it cannot hold a mid-stroke load without external mechanical locking. This specific SKU includes the male M8x1.25 rod thread and lacks a piston magnet, so it cannot accept reed or electronic switches without upgrading to the -S variant.
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 STA25X5B FAQ
This model provides 177.7 N of net pull at 0.5 MPa and 260.1 N at 0.7 MPa. These figures already account for the force lost to overcoming the internal return spring.
No, this specific SKU lacks a piston magnet and cannot accept sensing switches. You must specify the -S option to add a magnet for AirTAC reed or electronic switches. It also requires at least 0.2 MPa of air pressure to overcome the spring.
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