Airtac STA Single Acting Compact Guided Cylinder STA20X25
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X25 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm 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.
- BoreØ20 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM4×0.7 (F) / M6×1.0 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA20X25
The AirTAC STA20X25 is a compact single-acting pull-type cylinder where air pressure retracts the rod and an internal spring extends it back out. It yields 108.9 N of net pull at 0.5 MPa, making it suitable for tensioning and return-to-open tasks. Because the spring performs the extension, only one air line is required for plumbing.
This unit features a short riveted body that minimizes axial mounting depth in tight machinery. It uses an 8 mm piston rod, an M5x0.8 port, and a fixed NBR bumper to decelerate the stroke end. Since this specific SKU lacks the -S option, it has no piston magnet and cannot accept position switches.
Airtac STA Single Acting Compact Guided Cylinder STA20X25 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X25 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 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 (Ø20mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 109 N |
| 0.7 MPa | 162 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 STA20X25
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | 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 STA20X25 Is Used
Tensioning Mechanisms
Uses the 108.9 N net pull to draw back tension cables or belts, relying on the internal spring to maintain baseline tension when air is removed.
Gate Return Diverter
Pulls a sorting diverter gate out of the product flow path, letting the spring push it back to the default open position for line changeovers.
Film Clamp Release
Retracts a holding clamp during packaging cycles, with the spring automatically extending the jaw to secure materials during downtime.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X25 the Right Cylinder?
When sizing this model, consider the neighboring bores: stepping down to the STA16 provides 66.4 N at 0.5 MPa, while moving up to the STA25 offers 177.7 N. Based on the 108.9 N rating at 0.5 MPa, a safe working load is roughly 65 N, allowing a vertical lift of approximately 5.6 kg with a 2:1 safety margin.
The maximum standard stroke for this series is 30 mm, and this 25 mm variant operates safely within that limit. Remember that the spring drives the rod out upon air loss, so it will not hold a mid-stroke load without live pressure. Confirm your requirements for the M5x0.8 port, the female M4x0.7 rod-end thread, and the lack of a magnet before ordering.
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 STA20X25 FAQ
The STA20X25 provides a net pull force of 108.9 N at 0.5 MPa and 161.7 N at 0.7 MPa. These figures already account for the internal return spring resistance.
No, this specific SKU does not include the -S magnet option, so it cannot accept reed or electronic switches. You would need the STA20X25S variant for position sensing.
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