Airtac STA Single Acting Compact Guided Cylinder STA40X20SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X20SB is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø40mm 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.
- BoreØ40 mm
- Stroke20 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 STA40X20SB
The AirTAC STA40X20SB is a compact single-acting pull-type cylinder where compressed air retracts the 16 mm rod and an internal spring pushes it back out. It yields 445.1 N of net pull at 0.5 MPa, meaning the quoted force already subtracts the spring resistance. This thin riveted body saves valuable axial mounting depth where round-body alternatives will not fit.
This specific configuration includes a built-in piston magnet for AirTAC reed or electronic switches, plus a male M14x1.5 threaded rod end for direct load attachment. A fixed NBR bumper decelerates the stroke end, operating effectively between 50-500 mm/s. It requires at least 0.2 MPa of air pressure to overcome the internal spring and begin the retraction motion.
Airtac STA Single Acting Compact Guided Cylinder STA40X20SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X20SB |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 STA40X20SB
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 40 | 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 STA40X20SB Is Used
Tension Mechanism Pullback
Utilize the 445.1 N net pull to retract and maintain tension on drive belts or cables, with the male M14x1.5 rod threading directly into the tensioning block.
Pneumatic Gate Retraction
Apply air to pull a diverter gate closed against a 267 N safe working load, relying on the internal spring to automatically open the gate on air loss.
Carton Hold-Down Release
Pull a hold-down arm out of the way for carton ejection, letting the fixed NBR bumper absorb the shock of the 20 mm retraction stroke at high cycle rates.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X20SB the Right Cylinder?
When sizing this 40 mm bore, verify if the 445.1 N net pull at 0.5 MPa meets your tensioning requirement. Stepping down to the STA32 bore drops the net pull to 290.1 N, while stepping up to the STA50 bore increases it to 717.7 N. The 20 mm stroke sits well below the 30 mm family ceiling.
Keep in mind the spring-extend behavior: if air pressure drops, the rod drives to its outward rest position and will not hold a mid-stroke load. This STA40X20SB variant features a PT1/8 port, the -S magnet for position sensing, and the -B male M14x1.5 piston rod thread. Based on the 445.1 N rating, a safe working load is roughly 267 N, allowing a vertical lift of about 22.7 kg with a 2:1 safety margin.
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 STA40X20SB FAQ
This cylinder provides 445.1 N of net pull at 0.5 MPa and 656.2 N at 0.7 MPa. These values already account for the internal spring resistance, so you can size directly to these net figures.
No, it is a single-acting pull type where the spring extends the rod. It requires a minimum of 0.2 MPa to overcome the spring and retract. On air loss, the rod moves to its extended rest position and will not hold a mid-stroke load.
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