Airtac STA Single Acting Compact Guided Cylinder STA25X25B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X25B 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 STA25X25B
The AirTAC STA25X25B is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring extends it back out. It provides 177.7 N of net pull at 0.5 MPa, reaching 260.1 N at 0.7 MPa. Because the return spring constantly pushes outward, the actuator rests in the extended position and automatically fails to that state upon loss of air pressure.
This specific SKU features a male M8x1.25 piston rod thread and omits the piston magnet. Its short riveted body saves valuable axial mounting depth in cramped machinery. End-of-stroke deceleration is handled strictly by a fixed NBR bumper, which absorbs shock but does not lock the load in place.
Airtac STA Single Acting Compact Guided Cylinder STA25X25B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X25B |
|---|---|
| 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 STA25X25B
| 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 STA25X25B Is Used
Gate Closure Mechanism
Uses the spring-extend function to keep a diverting gate open by default, with the 177.7 N air-pull force drawing it shut to reroute packages on demand.
Film Tensioning Arm
Maintains steady tension on packaging webbing by pulling the male M8 rod inward against the load, releasing smoothly when air is vented.
Hold-Down Clamp
Secures lightweight cartons for labeling by retracting the rod to apply 260.1 N of pull at 0.7 MPa, then lifting away via spring force.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X25B 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 yields 108.9 N; stepping up, the STA32 provides 290.1 N. For reliable vertical lifting, a safe working load is roughly 107 N (about 60 percent of the 0.5 MPa figure), allowing a 9.1 kg lift with a 2:1 safety margin.
This model has a 25 mm stroke, well within the 30 mm ceiling for the series. It requires 0.2 to 1.0 MPa operating pressure to overcome the spring. Confirm your need for the male M8x1.25 rod thread and note that without the -S magnet code, this unit cannot accept reed or electronic switches.
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 STA25X25B FAQ
This cylinder generates 177.7 N of net pull at 0.5 MPa and 260.1 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the internal return spring, with a maximum limit of 1.0 MPa.
No. As a single-acting pull-type actuator, the spring constantly drives the rod to the extended position. If air is lost, it fails to that extended state. It cannot hold a mid-stroke load, and the fixed NBR bumper only decelerates the stroke end without locking it.
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