Airtac STA Single Acting Compact Guided Cylinder STA25X20B
The AirTAC Airtac STA Single Acting Compact Guided Cylinder STA25X20B is a genuine single-acting COMPACT cylinder (single acting, pull type) with a Ø25mm 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.
- BoreØ25 mm
- Stroke20 mm
- Port sizeM5×0.8
- Acting typeSingle acting, pull type
- Rod threadM5×0.8 (F) / M8×1.25 (B)
- CushionFixed NBR bumper
About the Airtac STA Single Acting Compact Guided Cylinder STA25X20B
The AirTAC STA25X20B is a compact single-acting pull-type cylinder where compressed air retracts the rod and an internal spring pushes it back out. It yields 177.7 N of net pull at 0.5 MPa (260.1 N at 0.7 MPa), with the spring force already subtracted from the pneumatic effort. This unit features a male M8x1.25 threaded piston rod end for direct load attachment.
Its short riveted body minimizes axial mounting depth, fitting where larger profile cylinders cannot. A fixed NBR bumper handles end-of-stroke deceleration, and the bore requires only a single M5x0.8 air line to actuate. This SKU lacks a piston magnet, so it cannot accept position switches without upgrading to the -S variant.
Airtac STA Single Acting Compact Guided Cylinder STA25X20B Technical Specifications
| Model | Airtac STA Single Acting Compact Guided Cylinder STA25X20B |
|---|---|
| Series | STA compact single-acting cylinder |
| Bore size | Ø25 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull type |
| Port size | M5×0.8 |
| Rod end thread | M5×0.8 female / M8×1.25 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 (Ø25mm, Pull)
| Pressure | Pull force (net) |
|---|---|
| 0.5 MPa | 178 N |
| 0.7 MPa | 260 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 STA25X20B
| STA | Compact single acting, pull type cylinder series. |
|---|---|
| 25 | 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 STA25X20B Is Used
Tension Gate Release
Uses the 177.7 N net pull to retract a tensioned diverter gate on a packaging line, allowing the internal spring to push it back to the closed position when air is cut.
Carton Hold-Down
Pulls a clamping arm down to secure cardboard cartons during labeling, relying on the male M8x1.25 rod for a rigid mechanical connection.
Return-to-Open Latch
Retracts a safety latch to release a fixture, with the spring ensuring the mechanism defaults to an extended, safe open state during an air pressure drop.
Is the Airtac STA Single Acting Compact Guided Cylinder STA25X20B the Right Cylinder?
When sizing this unit, verify the 20 mm stroke fits within the 30 mm series ceiling. For sizing both ways, the STA20 bore provides 108.9 N net pull at 0.5 MPa, while the larger STA32 offers 290.1 N at the same pressure. Operating pressure must sit between 0.2 and 1.0 MPa, needing at least 0.2 MPa to overcome the internal spring.
Because air only pulls the load inward, the spring drives the rod out upon air loss, meaning it cannot hold a mid-stroke load without external locking. Based on the 177.7 N figure, a safe working load is roughly 107 N (about 60 percent capacity), translating to a vertical lift of approximately 9.1 kg with a 2:1 safety margin. Confirm your bore, stroke, M5x0.8 port, and male M8x1.25 rod thread requirements.
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 STA25X20B FAQ
This model provides 177.7 N net pull at 0.5 MPa and 260.1 N at 0.7 MPa. Operating pressure ranges from 0.2 to 1.0 MPa, requiring at least 0.2 MPa to overcome the return spring.
No, this specific SKU does not include a piston magnet. To use AirTAC reed or electronic switches, you must select the -S variant of this bore size.
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