Airtac STA Single Acting Compact Guided Cylinder STA50X20S
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X20S is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø50mm 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.
- BoreØ50 mm
- Stroke20 mm
- Port sizePT1/4
- Acting typeSingle acting, pull type
- Rod threadM10×1.5 (F) / M18×1.5 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA50X20S
The AirTAC STA50X20S is a compact single-acting pull-type cylinder where compressed air retracts the 20 mm stroke and an internal return spring pushes it back out. It yields 717.7 N of net pull at 0.5 MPa, or 1047.5 N at 0.7 MPa, making the spring force already subtracted from the pneumatic rating. Because it is normally extended at rest, it safely fails to the extended position upon air loss.
The short riveted body saves axial mounting depth where a round-body cylinder will not fit, while the integrated -S piston magnet supports AirTAC reed or electronic switches for end-of-stroke detection. A fixed NBR bumper decelerates the piston at the stroke ends, operating effectively between 0.2 and 1.0 MPa at speeds of 50-500 mm/s.
Airtac STA Single Acting Compact Guided Cylinder STA50X20S Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X20S |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø50 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull type |
| Port size | PT1/4 |
| Rod end thread | M10×1.5 female / M18×1.5 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 (Ø50mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 718 N |
| 0.7 MPa | 1048 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 STA50X20S
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 50 | 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 STA50X20S Is Used
Tensioning Mechanisms
Uses the 717.7 N net pull to draw tension straps or cables tight, with the internal spring automatically relaxing the load when air pressure drops.
Pneumatic Gate Return
Holds a diverter gate open via air retraction and relies on the spring to snap it shut instantly during an emergency stop or power loss.
Package Hold-Down
Pulls a 20 mm stroke clamping arm out of the way for carton loading, then vents to let the spring extend and press the carton securely.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X20S the Right Cylinder?
When sizing this 50 mm bore, stepping down to the STA40 yields 445.1 N net pull at 0.5 MPa, whereas stepping up to the STA63 provides 1225.5 N. This STA50X20S hits a solid middle ground, offering a safe working load of roughly 431 N (about 60% of its 717.7 N rating) and a vertical lift capacity near 36.6 kg with a 2:1 safety margin.
Keep in mind the 30 mm maximum standard stroke ceiling for this series. Because the spring drives the rod out when air is removed, this unit does not hold a mid-stroke load without live pressure; use a double-acting SDA with an external rod lock if you need secure intermediate positioning. This configuration includes the -S magnet, a PT1/4 port, and a female M10x1.5 rod-end thread.
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 STA50X20S FAQ
The STA50X20S provides a net pull force of 717.7 N at 0.5 MPa and 1047.5 N at 0.7 MPa. These figures already account for the internal return spring resistance, so you can size directly to these values.
Air pressure of at least 0.2 MPa is required to overcome the spring and retract the rod; venting the air allows the spring to extend it. The built-in -S magnet works with AirTAC reed or electronic switches to confirm end positions.
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