Airtac STA Single Acting Compact Guided Cylinder STA20X5
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA20X5 is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø20mm bore and 5mm 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
- Stroke5 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 STA20X5
The AirTAC STA20X5 is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring pushes it back out. It generates 108.9 N of net pull at 0.5 MPa, safely handling a working load of roughly 65 N or lifting about 5.6 kg vertically with a 2:1 margin. This 5 mm stroke unit is normally extended at rest and fails safely to that extended position if air pressure drops.
Designed to save axial mounting depth, the short riveted body fits where round-body alternatives will not. It uses an 8 mm piston rod and a fixed NBR bumper at each end to decelerate the stroke, rather than an adjustable air cushion. This specific SKU lacks a piston magnet, so it cannot accept reed or electronic switches without upgrading to the -S variant.
Airtac STA Single Acting Compact Guided Cylinder STA20X5 Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA20X5 |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø20 mm |
| Stroke | 5 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 STA20X5
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×5 | 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 STA20X5 Is Used
Short-Stroke Tensioning
Pulls light clamps or tension wires with a 5 mm stroke, utilizing the 108.9 N net pull to draw components securely inward against spring resistance.
Gate Return Mechanism
Holds a diverter gate open pneumatically and relies on the internal spring to snap it shut instantly when air is vented, ensuring fail-safe routing.
Film Hold-Down
Retracts a small guide pin to let packaging film feed freely, using the spring-extend function to lock the pin back into the resting position.
Is the Airtac STA Single Acting Compact Guided Cylinder STA20X5 the Right Cylinder?
When sizing this model, compare its 108.9 N net pull at 0.5 MPa against neighboring bores: the STA16 provides 66.4 N, while the STA25 offers 177.7 N. This makes the 20 mm bore the right middle ground for moderate tensioning tasks. The 5 mm stroke is well within the 30 mm maximum limit for this series.
Remember that the internal spring drives the rod out upon air loss, meaning it cannot hold a mid-stroke load without live pressure or an external rod lock. This base configuration features an M5x0.8 port, a female M4x0.7 rod-end thread, and no magnet. If your application requires position sensing, select the -S option; if you need a male thread, append the B code.
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 STA20X5 FAQ
The STA20X5 provides a net pull force of 108.9 N at 0.5 MPa and 161.7 N at 0.7 MPa. These figures already account for the internal return spring resistance, so you can size directly to these values.
No, the spring extends the rod to its resting position on air loss, so it cannot hold a mid-stroke load. Additionally, the system requires a minimum operating pressure of 0.2 MPa just to overcome the spring and retract the rod.
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