Airtac STA Single Acting Compact Guided Cylinder STA12X20SB
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA12X20SB is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø12mm 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.
- BoreØ12 mm
- Stroke20 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 STA12X20SB
The AirTAC STA12X20SB is a compact single-acting pull-type cylinder where air retracts the 6 mm rod and an internal spring extends it back out. It yields 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 stroke, you only need one M5x0.8 air line and a single solenoid port to operate it.
This thin riveted-body design saves axial mounting depth where a longer cylinder will not fit. The -S option adds a built-in piston magnet for position sensing via AirTAC reed or electronic switches, while the -B code specifies a male M5x0.8 rod-end thread instead of the default female M3x0.5. End-of-stroke shock is managed strictly by a fixed NBR bumper, which decelerates the piston without locking it in place.
Airtac STA Single Acting Compact Guided Cylinder STA12X20SB Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA12X20SB |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø12 mm |
| Stroke | 20 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 STA12X20SB
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 12 | 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 STA12X20SB Is Used
Light-Part Pull-Back
Retracts a small 1.5 kg machining fixture using 32.4 N of net pull, letting the spring push the clamp open when air stops.
Diverter Gate Return
Holds a conveyor sorting gate open pneumatically and relies on the internal spring to snap it closed during an air loss.
Film Tensioning
Maintains steady tension on light packaging film by pulling the 6 mm rod in against the spring force at 0.5 MPa.
Is the Airtac STA Single Acting Compact Guided Cylinder STA12X20SB the Right Cylinder?
When sizing this 12 mm bore, compare its 32.4 N net pull at 0.5 MPa against the next size up: the STA16X20SB provides 66.4 N, making this model the right choice for lighter tensioning tasks under 20 N. If your application demands even less force, note that 12 mm is the smallest available bore in this series. The 20 mm stroke sits well below the 30 mm maximum limit for standard single-acting models.
Remember that the internal spring constantly drives the rod to the extended position, so the STA12X20SB cannot hold a mid-stroke load without live air pressure. You must supply at least 0.2 MPa to overcome the spring. Verify your setup needs the male M5x0.8 rod thread, the M5x0.8 port, and the built-in magnet for switch compatibility.
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 STA12X20SB FAQ
This cylinder provides a net pull force of 32.4 N at 0.5 MPa and 49.4 N at 0.7 MPa. These figures already account for the internal return spring, meaning this is the actual usable force available to pull your load.
Air pressure retracts the rod, while the internal spring extends it to rest. You must supply at least 0.2 MPa to overcome the spring. The built-in -S magnet allows tracking with either AirTAC reed or electronic solid-state switches.
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