Airtac STA Single Acting Compact Guided Cylinder STA40X25
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X25 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø40mm 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.
- BoreØ40 mm
- Stroke25 mm
- Port sizePT1/8
- Acting typeSingle acting, pull type
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA40X25
The AirTAC STA40X25 is a compact single-acting pull-type cylinder where compressed air retracts the 16 mm rod and an internal spring extends it back out. It provides 445.1 N of net pull at 0.5 MPa and 656.2 N at 0.7 MPa. Because the quoted force is already net of the return spring, you can size directly to these numbers without manual subtraction.
This thin riveted-body actuator saves axial mounting depth where a round-body cylinder will not fit. It runs on a single PT1/8 air line, requires 0.2 to 1.0 MPa operating pressure to overcome the spring, and uses a fixed NBR bumper to decelerate the stroke end. This SKU lacks the -S magnet option, so it cannot accept reed or electronic switches.
Airtac STA Single Acting Compact Guided Cylinder STA40X25 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X25 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 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 (Ø40mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 445 N |
| 0.7 MPa | 656 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 STA40X25
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 40 | 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 STA40X25 Is Used
Tension Gate Closure
Uses the 445.1 N net pull to draw a conveyor diverter gate inward against product flow, relying on the spring to push it back open during jams.
Carton Hold-Down
Pulls a 16 mm rod to clamp packaging flaps during a 25 mm sealing cycle, saving axial depth inside tight machinery frames.
Pallet Stopper Retract
Air retracts the stopper pin to let pallets pass on a 50-500 mm/s cycle, while the spring snaps it back up to block the next load.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X25 the Right Cylinder?
When sizing this 40 mm bore actuator, compare it both ways: stepping down to the STA32 yields 290.1 N net pull at 0.5 MPa, while stepping up to the STA50 provides 717.7 N. The 25 mm stroke sits comfortably under the 30 mm single-acting ceiling. A safe working load is roughly 267 N, allowing a vertical lift of about 22.7 kg with a 2:1 margin.
Remember that on air loss the internal spring drives the rod to its extended rest position, meaning it cannot hold a mid-stroke load without live pressure or an external lock. This base configuration uses a female M8x1.25 rod-end thread. If your application requires position sensing, select the -S variant for switch readiness.
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 STA40X25 FAQ
The STA40X25 provides 445.1 N net pull at 0.5 MPa and 656.2 N at 0.7 MPa. It requires an operating pressure of 0.2 to 1.0 MPa, needing at least 0.2 MPa to overcome the internal return spring.
No. On air loss the spring forces the rod to its extended rest position, so it cannot hold a mid-stroke load without an external lock. Additionally, this specific SKU lacks the -S magnet and cannot take reed or electronic switches.
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