Airtac STA Single Acting Compact Guided Cylinder STA40X20S
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X20S 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 STA40X20S
The AirTAC STA40X20S 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 provides 445.1 N of net pull at 0.5 MPa and 656.2 N at 0.7 MPa. Because the quoted force is already net of the return spring, you can size directly to these values without manual subtraction.
This unit includes a built-in piston magnet (-S) for AirTAC reed or electronic switches. The short riveted body saves axial mounting depth where larger profile cylinders will not fit. End-of-stroke deceleration is handled by a fixed NBR bumper, not an adjustable air cushion. Operating pressure ranges from 0.2 to 1.0 MPa, requiring at least 0.2 MPa to overcome the spring.
Airtac STA Single Acting Compact Guided Cylinder STA40X20S Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X20S |
|---|---|
| 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 STA40X20S
| 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 STA40X20S Is Used
Tension Gate Closure
Uses the 445.1 N net pull to draw a conveyor diverting gate inward against spring resistance, releasing it automatically to the open position when air pressure drops.
Film Roll Hold-Down
Pulls a packaging film tensioning arm back during the wrap cycle, relying on the internal spring to maintain consistent outward tracking pressure at rest.
Component Retraction Fixture
Retracts a locating pin out of the way on an assembly line using the 656.2 N pull at 0.7 MPa, letting the spring extend the pin for the next part alignment.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X20S the Right Cylinder?
When sizing this 40 mm bore, compare it both ways: stepping down to the STA32 yields 290.1 N net pull at 0.5 MPa, while stepping up to the STA50 provides 717.7 N. A safe working load is approximately 267 N (about 60% of the 445.1 N figure), allowing a vertical lift of roughly 22.7 kg with a 2:1 margin. The 20 mm stroke sits well below the 30 mm maximum for this series.
Remember that on air loss the spring drives the rod out to the extended rest position, so the STA40X20S will not hold a mid-stroke load without external locking. This configuration features a PT1/8 port, a female M8x1.25 rod-end thread, and the -S magnet for solid-state or reed sensing.
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 STA40X20S FAQ
The STA40X20S provides a net pull force of 445.1 N at 0.5 MPa and 656.2 N at 0.7 MPa. These figures already account for the internal return spring resistance, meaning air pulls the load in with this exact force.
Air pressure retracts the rod, requiring a minimum of 0.2 MPa to overcome the spring, while the spring extends it when air is released. The included -S magnet allows tracking via AirTAC reed or electronic switches along the body grooves.
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