Airtac STA Single Acting Compact Guided Cylinder STA20X15
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X15 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm bore and 15mm 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
- Stroke15 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 STA20X15
The AirTAC STA20X15 is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring pushes it back out. It delivers 108.9 N of net pull at 0.5 MPa, meaning the quoted force already accounts for the spring resistance. This 20 mm bore unit uses an 8 mm rod and an M5x0.8 port.
Designed to save axial mounting depth, the short riveted body fits where round-body alternatives will not. It uses a fixed NBR bumper to decelerate the stroke end rather than an adjustable cushion. Because this specific SKU lacks the -S option, it has no piston magnet and cannot accept position switches.
Airtac STA Single Acting Compact Guided Cylinder STA20X15 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X15 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 15 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 STA20X15
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×15 | 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 STA20X15 Is Used
Tension Arm Retraction
Uses the 108.9 N net pull to draw a belt tensioning idler back when air is applied, releasing tension for maintenance.
Flap Hold-Down Release
Pulls a mechanical hold-down clear of a carton path during packaging cycles, letting the internal spring extend it back to block the next item.
Gate Return Mechanism
Air retracts the 8 mm rod to open a diverting gate, allowing the spring to positively push the gate shut when the line stops.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X15 the Right Cylinder?
When sizing this model, consider the neighboring bores: the STA16 yields 66.4 N net pull at 0.5 MPa, while the STA25 provides 177.7 N. A safe working load for this 20 mm bore is roughly 65 N, or a vertical lift of about 5.6 kg with a 2:1 margin. The 15 mm stroke sits well below the 30 mm maximum limit.
Remember that air pressure must reach at least 0.2 MPa to overcome the return spring. Upon air loss, the spring drives the rod out to the extended rest position, so it cannot hold a mid-stroke load without an external device. Confirm your requirements for the female M4x0.7 rod thread and M5x0.8 port.
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 STA20X15 FAQ
This cylinder provides a net pull of 108.9 N at 0.5 MPa and 161.7 N at 0.7 MPa. These figures already subtract the return spring force.
No, this specific SKU lacks the -S magnet option and cannot accept reed or electronic switches. You would need the -S variant for position sensing.
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