Airtac SSA Single-Acting Compact Cylinder SSA25X20S
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA25X20S is a genuine single-acting COMPACT cylinder (single acting, push type) with a Ø25mm bore and 20mm stroke. Air pushes 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, push type
- Rod threadM5×0.8 (F) / M8×1.25 (B)
- CushionFixed NBR bumper
About the Airtac SSA Single-Acting Compact Cylinder SSA25X20S
The AirTAC SSA25X20S is a compact single-acting push-type cylinder where air extends the rod and an internal spring retracts it. It provides 216.9 N of net push at 0.5 MPa, meaning the return spring force is already subtracted from the raw air pressure. This yields a safe working load of roughly 130 N, or a vertical lift capacity of about 11.1 kg with a 2:1 margin.
Because it relies on a spring return, you only need one air line and one solenoid port to drive the motion, cutting fitting costs and saving physical space. The short riveted body minimizes axial mounting depth in crowded fixtures. This -S variant includes a built-in piston magnet for position sensing with AirTAC reed or electronic switches.
Airtac SSA Single-Acting Compact Cylinder SSA25X20S Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA25X20S |
|---|---|
| Series | SSA compact single-acting cylinder |
| Bore size | Ø25 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push 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, Push)
| Pressure | Push force (net) |
|---|---|
| 0.5 MPa | 217 N |
| 0.7 MPa | 315 N |
These are NET output forces — the return-spring force is already deducted. Single-acting push only; the spring performs the opposite stroke. Size with a safety margin.
Model Code: Airtac SSA Single-Acting Compact Cylinder SSA25X20S
| SSA | Compact single acting, push 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 SSA Single-Acting Compact Cylinder SSA25X20S Is Used
Short-Stroke Clamping
Applies 216.9 N of net clamping pressure at 0.5 MPa to secure light metal workpieces during secondary machining.
Part Ejection
Pushes finished components off a conveyor belt using a 20 mm extension before the internal spring rapidly retracts the rod.
PCB Fixture Actuation
Uses the built-in magnet to confirm retraction before an assembly head descends, ensuring the 10 mm rod clears the board.
Is the Airtac SSA Single-Acting Compact Cylinder SSA25X20S the Right Cylinder?
When sizing this model, consider the neighboring bores: the SSA20 provides 134.1 N at 0.5 MPa, while the SSA32 offers 346.6 N at 0.5 MPa. This SSA25X20S hits a balanced 216.9 N, operating between 0.2 and 1.0 MPa with a 20 mm stroke that respects the 30 mm series ceiling.
Confirm the 25 mm bore, 20 mm stroke, M5x0.8 port, and the built-in magnet. The 10 mm rod uses a female M5x0.8 thread. Remember that on air loss the spring drives the rod back to rest, so it cannot hold a mid-stroke load without external locking.
Quick checklist
- ✓ Net push 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 SSA Single-Acting Compact Cylinder SSA25X20S FAQ
The net push force is 216.9 N at 0.5 MPa and 315.1 N at 0.7 MPa. These figures already account for the internal return spring resistance, giving you the true usable output.
No. It requires at least 0.2 MPa to overcome the spring, and if air is lost the spring drives the rod to its retracted rest position. It cannot hold a mid-stroke load without an external rod lock.
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