Airtac SSA Single-Acting Compact Cylinder SSA25X20
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA25X20 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 SSA25X20
The AirTAC SSA25X20 is a compact single-acting push-type cylinder where air pressure extends the rod and an internal spring retracts it. It provides 216.9 N of net push at 0.5 MPa, a figure that already accounts for the return spring force. This short riveted body saves axial mounting depth where a larger profile cylinder will not fit.
Because the spring handles the return stroke, you only need one air line and one solenoid port to drive the motion, reducing fitting complexity. The bore sets the rod diameter at 10 mm with an M5x0.8 port. End-of-stroke shock is managed by a fixed NBR bumper, which decelerates the piston but is not an adjustable cushion.
Airtac SSA Single-Acting Compact Cylinder SSA25X20 Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA25X20 |
|---|---|
| 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 SSA25X20
| 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 SSA25X20 Is Used
Fixture Clamping
Applies 216.9 N of extension force at 0.5 MPa to hold a workpiece securely against a stop during a machining operation.
Part Ejection
Uses the 20 mm stroke to push finished components off a conveyor belt quickly before the internal spring retracts the rod.
Carton Sealing
Extends to hold a folding carton flap in place momentarily while adhesive sets, relying on the single air line for simple actuation.
Is the Airtac SSA Single-Acting Compact Cylinder SSA25X20 the Right Cylinder?
When sizing this model, consider the neighboring bores: stepping down to the SSA20 yields 134.1 N at 0.5 MPa, while stepping up to the SSA32 provides 346.6 N. For the SSA25X20, a safe working load is roughly 130 N, allowing a vertical lift of about 11.1 kg with a 2:1 margin. The standard stroke ceiling for this series is 30 mm.
This configuration has a 25 mm bore, 20 mm stroke, M5x0.8 port, female rod-end thread, and no magnet. Without the -S option, it cannot accept reed or electronic switches. Remember that the spring drives the rod back upon air loss; it does not hold a mid-stroke load, so use an external rod lock if positioning is required without live pressure.
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 SSA25X20 FAQ
The net push force is 216.9 N at 0.5 MPa and 315.1 N at 0.7 MPa. These values already subtract the internal return spring force, giving you the actual output available for your application.
No, this specific SKU lacks the -S magnet option and cannot accept reed or electronic switches. You must select the -S variant if position sensing is required for your control system.
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