Airtac STA Single Acting Compact Guided Cylinder STA50X20
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X20 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 STA50X20
The AirTAC STA50X20 is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it out. It provides 717.7 N of net pull at 0.5 MPa, yielding a safe working load of roughly 431 N or a 36.6 kg vertical lift with a 2:1 margin. The short riveted body saves axial mounting depth where a round-body unit will not fit.
This 50 mm bore model runs on a PT1/4 port and features a 20 mm piston rod. It uses a fixed NBR bumper to decelerate the stroke end rather than an adjustable air cushion. Because this specific SKU lacks the -S magnet code, it cannot accept reed or electronic switches.
Airtac STA Single Acting Compact Guided Cylinder STA50X20 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X20 |
|---|---|
| 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 STA50X20
| 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 STA50X20 Is Used
Tensioning Station
Pulls a belt or cable taut with 717.7 N net force at 0.5 MPa, releasing tension instantly when air is removed.
Gate Return Mechanism
Holds a sliding gate open via air retraction and uses the internal spring to push it safely closed during a pressure drop.
Lift Lowering Control
Regulates the descent of a 36.6 kg vertical load by pulling it down against gravity while the spring manages the return.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X20 the Right Cylinder?
When sizing this unit, note the STA40 offers 445.1 N at 0.5 MPa, while the STA63 jumps to 1225.5 N at 0.5 MPa. This STA50X20 provides 1047.5 N at 0.7 MPa, requiring at least 0.2 MPa operating pressure to overcome the return spring. The standard stroke ceiling is 30 mm.
Remember the spring extends the rod on air loss, so it will not hold a mid-stroke load without live pressure or an external rod lock. This configuration confirms a 50 mm bore, 20 mm stroke, PT1/4 port, female M10x1.5 rod-end thread, and no piston magnet.
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 STA50X20 FAQ
The net pull force is 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.
No, this specific SKU lacks the -S option and has no piston magnet. You must select the -S variant to use AirTAC reed or electronic switches.
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