Airtac STA Single Acting Compact Guided Cylinder STA40X20B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA40X20B 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 STA40X20B
The AirTAC STA40X20B is a compact single-acting pull-type cylinder where compressed air retracts the 16 mm rod and an internal spring pushes it back out. This normally-extended actuator yields 445.1 N of net pull at 0.5 MPa, requiring a minimum of 0.2 MPa operating pressure to overcome the return spring. Its short riveted body saves axial mounting depth where a standard round-body cylinder will not fit.
This specific SKU features a male M14x1.5 piston rod thread for direct load attachment. End-of-stroke deceleration is handled by a fixed NBR bumper, which absorbs shock but is not an adjustable air cushion. Because this configuration lacks the -S magnet option, it cannot accept reed or electronic switches.
Airtac STA Single Acting Compact Guided Cylinder STA40X20B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA40X20B |
|---|---|
| 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 STA40X20B
| 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 STA40X20B Is Used
Tension Pull-Back
Uses the 445.1 N net pull to draw a tensioned belt or cable back to a home position when air is applied.
Vertical Hold-Down
Pulls a 22.7 kg vertical load securely downward against gravity during assembly clamping tasks.
Gate Retraction
Closes a diverter gate on a packaging line by pulling the linkage in, with the spring opening it on release.
Is the Airtac STA Single Acting Compact Guided Cylinder STA40X20B the Right Cylinder?
When sizing this 40 mm bore actuator, compare its 445.1 N net pull at 0.5 MPa against adjacent bores: the STA32 provides 290.1 N, while the STA50 offers 717.7 N. A practical safe working load is roughly 267 N, allowing a vertical lift of about 22.7 kg with a 2:1 safety margin. The 20 mm stroke sits well below the 30 mm series ceiling.
Remember that on air loss the internal spring drives the rod to its extended rest position, so the STA40X20B will not hold a mid-stroke load without an external locking device. Confirm your build requires the -B male M14x1.5 rod, the PT1/8 air port, and operates within the 50-500 mm/s speed range.
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 STA40X20B FAQ
The net pull force is 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.
No, this specific SKU lacks the -S magnet option, so it cannot accept reed or electronic switches. You must select the -S variant for position sensing.
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