Airtac SSA Single-Acting Compact Cylinder SSA40X20S
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA40X20S is a genuine single-acting COMPACT cylinder (single acting, push type) with a Ø40mm 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.
- BoreØ40 mm
- Stroke20 mm
- Port sizePT1/8
- Acting typeSingle acting, push type
- Rod threadM8×1.25 (F) / M14×1.5 (B)
- CushionFixed NBR bumper
About the Airtac SSA Single-Acting Compact Cylinder SSA40X20S
The AirTAC SSA40X20S is a compact single-acting push-type cylinder where air pressure extends the rod and an internal mechanical spring retracts it. At 40 mm bore, it provides 545.6 N of net push force at 0.5 MPa. The quoted force is already net of the return spring, giving a real design figure rather than raw air pressure. A safe working load is approximately 327 N, yielding a vertical lift capacity of about 27.8 kg with a 2:1 safety margin.
This model features a short riveted body that saves axial mounting depth in crowded machinery. It includes a built-in piston magnet for position sensing. The end-of-stroke deceleration is handled by a fixed NBR bumper, which absorbs shock but is not an adjustable air cushion. The 16 mm piston rod uses an M8x1.25 female thread and operates at speeds between 50 and 500 mm/s.
Airtac SSA Single-Acting Compact Cylinder SSA40X20S Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA40X20S |
|---|---|
| Series | SSA compact single-acting cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push type |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 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 (Ø40mm, Push)
| Pressure | Push force (net) |
|---|---|
| 0.5 MPa | 546 N |
| 0.7 MPa | 797 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 SSA40X20S
| SSA | Compact single acting, push type cylinder series. |
|---|---|
| 40 | 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 SSA40X20S Is Used
Stamping Pin Ejection
Uses the 545.6 N net push to eject formed pins from a die, with the spring safely retracting the rod during the press cycle.
Pallet Diverter Gate
Extends a 20 mm stroke to push heavy pallets onto a secondary line, relying on the fixed NBR bumper to absorb the impact.
Carton Flap Clamping
Applies compact clamping force during carton sealing, saving axial depth in tight packaging machinery envelopes.
Is the Airtac SSA Single-Acting Compact Cylinder SSA40X20S the Right Cylinder?
When sizing this bore, consider the neighboring options: stepping down to the SSA32 yields 346.6 N of net push at 0.5 MPa, while stepping up to the SSA50 provides 874.7 N. This SSA40X20S configuration specifies a 40 mm bore, a 20 mm stroke (within the 30 mm maximum standard limit), a PT1/8 air port, and the -S magnet option for AirTAC reed or electronic switches.
Remember that with air released, the internal spring drives the rod back to its retracted rest position. This cylinder does not hold a mid-stroke load or lock in place without live pressure. For load holding without continuous air pressure, an external rod lock or a double-acting SDA cylinder is required.
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 SSA40X20S FAQ
The SSA40X20S delivers 545.6 N of net push force at 0.5 MPa and 796.9 N at 0.7 MPa. These figures already account for the internal return spring resistance.
No. If air is lost, the internal spring drives the rod to its retracted rest position. It requires a minimum of 0.2 MPa to overcome the spring and does not hold mid-stroke loads without live pressure.
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