Airtac STA Single Acting Compact Guided Cylinder STA50X20SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA50X20SB 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 STA50X20SB
The AirTAC STA50X20SB is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring pushes it back out. It delivers 717.7 N of net pull at 0.5 MPa, making it suitable for heavy-duty tensioning and hold-down operations. The short riveted body saves axial mounting depth where a longer round-body unit will not fit.
This specific configuration includes a built-in piston magnet for AirTAC reed or electronic switches and a male M18x1.5 piston rod thread. A fixed NBR bumper handles end-of-stroke deceleration, and the unit requires a minimum operating pressure of 0.2 MPa to overcome the return spring.
Airtac STA Single Acting Compact Guided Cylinder STA50X20SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA50X20SB |
|---|---|
| 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 STA50X20SB
| 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 STA50X20SB Is Used
Heavy-Duty Tensioning
Pulls heavy cables or belts with 717.7 N net force, releasing tension instantly when air pressure drops.
Pallet Hold-Down
Secures large pallets during machining by pulling a clamp in, with the spring automatically opening the clamp on air loss.
Gate Retraction
Closes heavy diverter gates on packaging lines, using the internal spring to fail-safe the gate open during outages.
Is the Airtac STA Single Acting Compact Guided Cylinder STA50X20SB the Right Cylinder?
When sizing this model, compare its 717.7 N net pull at 0.5 MPa against adjacent bores: the STA40 provides 445.1 N, while the STA63 offers 1225.5 N. This yields a safe working load of roughly 431 N, or a vertical lift capacity of about 36.6 kg with a 2:1 safety margin. The 20 mm stroke sits well below the 30 mm series ceiling.
Because the spring drives the rod to its extended rest position on air loss, this cylinder does not hold a mid-stroke load without live pressure. Confirm your setup requires a 50 mm bore, 20 mm stroke, PT1/4 port, the -S magnet option, and the -B male M18x1.5 rod 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 STA50X20SB 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.
Air pressure retracts the rod, requiring at least 0.2 MPa to overcome the spring. When air is released, the spring extends the rod to its resting length, meaning it cannot hold a mid-stroke load without live pressure.
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