Airtac SSA Single-Acting Compact Cylinder SSA40X20
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA40X20 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 SSA40X20
The AirTAC SSA40X20 is a compact single-acting push-type cylinder where air pressure extends the rod and an internal mechanical spring retracts it. It generates 545.6 N of net push at 0.5 MPa, a figure that already accounts for the return spring force. This thin riveted body conserves axial mounting depth inside crowded machinery where standard round-body actuators will not fit.
Because only one air line and one solenoid port drive the motion, you reduce fitting complexity and valve costs. The 16 mm piston rod uses a fixed NBR bumper to decelerate the stroke end rather than an adjustable air cushion. This specific SKU lacks a piston magnet, so it cannot accept position switches without upgrading to the -S variant.
Airtac SSA Single-Acting Compact Cylinder SSA40X20 Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA40X20 |
|---|---|
| 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 SSA40X20
| 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 SSA40X20 Is Used
Stamping Ejector
Uses the 545.6 N net extension force to eject formed metal parts from a die in a shallow fixture.
Carton Flap Folder
Deploys the 20 mm stroke to tuck corrugated flaps prior to sealing, relying on the spring return for rapid cycling.
Bearing Press Fit
Applies steady pneumatic pressure to seat bearings into housings, with the fixed NBR bumper absorbing the final impact.
Is the Airtac SSA Single-Acting Compact Cylinder SSA40X20 the Right Cylinder?
When sizing this 40 mm bore actuator, compare its 545.6 N net push at 0.5 MPa against adjacent options: the 32 mm bore yields 346.6 N, while the 50 mm bore provides 874.7 N. A practical safe working load is roughly 327 N, which translates to a vertical lift capacity of about 27.8 kg with a 2:1 safety margin. The 20 mm stroke sits well below the 30 mm maximum standard limit.
Remember that air extends the rod while the spring drives it back to rest; this unit does not hold a mid-stroke load without live pressure. This configuration specifies a female M8x1.25 rod-end thread, a PT1/8 port, and no magnet. If your application requires male threading or electronic sensing, select the B or S option codes respectively.
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 SSA40X20 FAQ
This model provides a net push force of 545.6 N at 0.5 MPa and 796.9 N at 0.7 MPa. These values already subtract the internal return spring resistance, giving you the true usable output for your design calculations.
No. As a single-acting push type, the internal spring retracts the rod to its rest position when air is released or lost. It cannot hold a mid-stroke load, and you must maintain at least 0.2 MPa of operating pressure to overcome the spring during extension.
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