Airtac STA Single Acting Compact Guided Cylinder STA25X20S
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X20S 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 STA25X20S
The AirTAC STA25X20S is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it back out. It provides 177.7 N of net pull at 0.5 MPa, making it well-suited for tensioning and hold-down duties. Because the spring performs the extension stroke, only one air line is required for operation.
This model features a 25 mm bore, a 20 mm stroke, and a built-in magnet for position sensing. The short riveted body saves axial mounting depth where a standard round-body cylinder will not fit. A fixed NBR bumper handles end-of-stroke deceleration, and the 10 mm piston rod uses an M5x0.8 port.
Airtac STA Single Acting Compact Guided Cylinder STA25X20S Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X20S |
|---|---|
| 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 STA25X20S
| 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 STA25X20S Is Used
Tensioning Systems
Uses the 177.7 N net pull to draw back webbing or wire, relying on the spring to maintain baseline tension when air is vented.
Package Hold-Down
Pulls a 10 mm rod inward to grip cartons on a 20 mm stroke, releasing them instantly via spring extension upon air loss.
Gate Return Mechanism
Closes a light diverter gate using pneumatic pull, with the internal spring automatically pushing the gate open as a fail-safe.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X20S the Right Cylinder?
When sizing this model, consider the neighboring bores: the STA20 yields 108.9 N net pull at 0.5 MPa, while the STA32 provides 290.1 N. The STA25X20S offers a calculated safe working load of roughly 107 N, allowing a vertical lift of about 9.1 kg with a 2:1 safety margin. Keep in mind the 30 mm maximum standard stroke ceiling for this series.
Because it is spring-extended, the rod drives to its outward rest position on air loss and will not hold a mid-stroke load. This specific configuration includes the -S magnet for AirTAC reed or electronic switches and a female M5x0.8 rod-end thread. Operating pressure must be at least 0.2 MPa to overcome the internal spring.
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 STA25X20S FAQ
This single-acting pull cylinder delivers 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 the internal return spring.
No, the spring drives the rod to its extended rest position when air is removed. It requires at least 0.2 MPa operating pressure to overcome the spring, and a double-acting SDA with an external rod lock is needed for mid-stroke holding.
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