Airtac SSA Single-Acting Compact Cylinder SSA25X20SB
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA25X20SB 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 SSA25X20SB
The AirTAC SSA25X20SB is a compact single-acting push-type cylinder where air pressure extends the rod and an internal mechanical spring handles the retraction. Delivering 216.9 N of net push at 0.5 MPa, it uses a short riveted body to minimize axial mounting depth in crowded machinery. This specific build includes a male M8x1.25 threaded rod end and a built-in piston magnet.
Because the spring performs the return stroke, you only need a single air line and one solenoid port to drive the motion, cutting fitting costs and simplifying valves. The quoted force is already net of the return spring, representing a true design figure rather than raw air thrust. End-of-travel shock is managed strictly by a fixed NBR bumper, not an adjustable cushion.
Airtac SSA Single-Acting Compact Cylinder SSA25X20SB Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA25X20SB |
|---|---|
| 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 SSA25X20SB
| 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 SSA25X20SB Is Used
Short-Stroke Part Clamping
Applies 216.9 N of net clamping pressure at 0.5 MPa to secure thin workpieces during light machining without crowding the fixture.
Package Diverter Ejector
Uses the single-air-line simplicity to push light cartons off a sorting line, with the internal spring safely retracting the rod between cycles.
Bin Gate Actuation
Fits into tight axial spaces to open and close small hopper gates, relying on the fixed NBR bumper to absorb the end-of-stroke impact.
Is the Airtac SSA Single-Acting Compact Cylinder SSA25X20SB the Right Cylinder?
When sizing this 25 mm bore, check both neighbors: stepping down to the SSA20 yields 134.1 N at 0.5 MPa, while moving up to the SSA32 provides 346.6 N. A practical safe working load is roughly 130 N, offering a 2:1 safety margin for a vertical lift of about 11.1 kg. The standard stroke ceiling for this series is 30 mm, so this 20 mm unit fits standard specs.
Remember that upon air loss the spring drives the rod to its retracted rest position, meaning it cannot hold a mid-stroke load without live pressure or an external lock. Operating pressure must be at least 0.2 MPa to overcome the spring, up to a maximum of 1.0 MPa. This SSA25X20SB configuration confirms a 25 mm bore, 20 mm stroke, M5x0.8 port, an -S magnet for reed or electronic switches, and a -B male M8x1.25 piston rod.
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 SSA25X20SB FAQ
The net push force is 216.9 N at 0.5 MPa and 315.1 N at 0.7 MPa. These figures already subtract the return spring resistance, giving you the true usable output for your design calculations.
Air pressure extends the rod while the internal spring retracts it, requiring a minimum of 0.2 MPa to overcome the spring. The included -S magnet allows position detection using AirTAC reed or electronic switches.
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