Airtac SSA Single-Acting Compact Cylinder SSA25X20B
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA25X20B 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 SSA25X20B
The AirTAC SSA25X20B is a compact single-acting push-type cylinder where air pressure extends the rod and an internal spring handles the retraction. It provides 216.9 N of net push at 0.5 MPa, making it highly effective for short-stroke clamping and ejection tasks. Because it needs only one air line and one solenoid port to drive the motion, plumbing is simplified and fitting costs drop significantly.
This specific SKU features a male M8x1.25 threaded rod end and lacks a piston magnet. The short riveted body conserves axial mounting depth in tight fixtures, while a fixed NBR bumper absorbs the end-of-stroke shock without offering adjustable cushioning. With a 10 mm piston rod and an M5x0.8 port, it is engineered for precise, space-constrained actuation.
Airtac SSA Single-Acting Compact Cylinder SSA25X20B Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA25X20B |
|---|---|
| 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 SSA25X20B
| 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 SSA25X20B Is Used
Fixture Clamping
Uses the 216.9 N net push to secure aluminum housings during machining, with the male M8x1.25 rod threading directly into a custom clamp arm.
Parts Ejection
Pushes completed plastic molded parts off a conveyor belt in a crowded cell where the short riveted body saves critical axial depth.
Carton Sealing
Extends 20 mm to hold a minor flap flat on a packaging line while adhesive cures, relying on the fixed NBR bumper to soften the impact.
Is the Airtac SSA Single-Acting Compact Cylinder SSA25X20B the Right Cylinder?
When sizing this model, compare its 216.9 N net push at 0.5 MPa against adjacent bores: the SSA20 yields 134.1 N, while the SSA32 provides 346.6 N. For this 25 mm bore, a safe working load is roughly 130 N (about 60 percent of the 0.5 MPa figure), allowing a vertical lift of approximately 11.1 kg with a 2:1 safety margin. The standard stroke ceiling for this series is 30 mm, and this 20 mm stroke falls well within that limit.
Confirm the 25 mm bore, 20 mm stroke, and M5x0.8 port match your system. This variant includes the B option for a male M8x1.25 piston rod and has no S magnet, meaning it cannot support magnetic sensing. Remember that the internal spring drives the rod back to rest upon air loss; it will not hold a mid-stroke load without live pressure or an external locking device.
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 SSA25X20B FAQ
This single-acting push cylinder delivers 216.9 N of net force 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 for your design.
No, the internal spring drives the rod back to its retracted rest position when air is released. It requires a minimum of 0.2 MPa to overcome the spring and cannot hold a mid-stroke load without live pressure or an external rod lock.
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