Airtac STA Single Acting Compact Guided Cylinder STA12X25S
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA12X25S is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø12mm bore and 25mm 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.
- BoreØ12 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM3×0.5 (F) / M5×0.8 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA12X25S
The AirTAC STA12X25S is a compact single-acting pull-type cylinder where air retracts the rod and an internal spring extends it back out. It provides 32.4 N of net pull at 0.5 MPa, safely handling a working load of roughly 19 N or vertically lifting about 1.7 kg with a 2:1 margin. Because the spring performs the extension, you only need one M5x0.8 air line and one solenoid port to operate it.
This thin riveted body saves axial mounting depth where a standard round-body cylinder will not fit. The piston rod measures 6 mm with a female M3x0.5 thread, and the -S option adds a built-in piston magnet for position sensing. A fixed NBR bumper decelerates the stroke end, requiring 0.2 to 1.0 MPa of operating pressure to function correctly.
Airtac STA Single Acting Compact Guided Cylinder STA12X25S Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA12X25S |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø12 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type |
| Port size | M5×0.8 |
| Rod end thread | M3×0.5 female / M5×0.8 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 (Ø12mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 32 N |
| 0.7 MPa | 49 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 STA12X25S
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×25 | 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 STA12X25S Is Used
Light-Part Tensioning
Uses the 32.4 N net pull at 0.5 MPa to draw small machined components into a fixture, relying on the internal spring to release the tension when air is cut.
Package Deflector Arm
Air retracts a small guide gate to let boxes pass on a tight conveyor, while the spring extends the gate back into the flow path to divert subsequent items.
Lab Sample Hold-Down
Pulls a lightweight clamp down over test vials with a safe working load of 19 N, saving axial space in crowded scientific equipment with its compact riveted body.
Is the Airtac STA Single Acting Compact Guided Cylinder STA12X25S the Right Cylinder?
When sizing this 12 mm bore model, its 32.4 N net pull at 0.5 MPa is the baseline. Stepping up to the STA16 increases that force to 66.4 N, while stepping down is not an option as this is the smallest available bore. This 25 mm stroke sits well under the 30 mm maximum standard limit.
Remember that on air loss the spring drives the rod to its extended rest position, so it will not hold a mid-stroke load without an external lock. This STA12X25S configuration includes the -S magnet for reed or electronic switches and uses the standard female M3x0.5 rod-end thread. Verify if your application requires the male M5x0.8 thread option instead.
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 STA12X25S FAQ
The net pull force is 32.4 N at 0.5 MPa and 49.4 N at 0.7 MPa. These figures already account for the internal return spring, so you can size directly to these values without further subtraction.
Air pressure retracts the rod, and the internal spring extends it when air is released. It requires a minimum of 0.2 MPa to overcome the spring. The -S option provides a built-in magnet for use with AirTAC reed or electronic switches.
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