Airtac SSA Single-Acting Compact Cylinder SSA50X20S
The AirTAC Airtac SSA Single-Acting Compact Cylinder SSA50X20S is a genuine single-acting COMPACT cylinder (single acting, push type) with a Ø50mm 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.
- BoreØ50 mm
- Stroke20 mm
- Port sizePT1/4
- Acting typeSingle acting, push type
- Rod threadM10×1.5 (F) / M18×1.5 (B)
- CushionFixed NBR bumper
About the Airtac SSA Single-Acting Compact Cylinder SSA50X20S
The AirTAC SSA50X20S is a compact single-acting push-type cylinder where air pressure extends the rod and an internal spring retracts it. It provides 874.7 N of net push at 0.5 MPa (1267.4 N at 0.7 MPa), with the return-spring force already subtracted for accurate sizing. A short riveted body minimizes axial mounting depth in crowded machinery.
This 50 mm bore unit features a 20 mm piston rod and a PT1/4 port. The -S option includes a built-in piston magnet for position sensing with AirTAC reed or electronic switches. End-of-stroke deceleration relies on a fixed NBR bumper, which absorbs shock but is not an adjustable cushion.
Airtac SSA Single-Acting Compact Cylinder SSA50X20S Technical Specifications
| Model | Airtac SSA Single-Acting Compact Cylinder SSA50X20S |
|---|---|
| Series | SSA compact single-acting cylinder |
| Bore size | Ø50 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push type |
| Port size | PT1/4 |
| Rod end thread | M10×1.5 female / M18×1.5 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 (Ø50mm, Push)
| Pressure | Push force (net) |
|---|---|
| 0.5 MPa | 875 N |
| 0.7 MPa | 1267 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 SSA50X20S
| SSA | Compact single acting, push type cylinder series. |
|---|---|
| 50 | 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 SSA50X20S Is Used
Heavy-Duty Part Ejection
Uses the 874.7 N net push at 0.5 MPa to positively eject heavy stamped metal parts from a die set in a 20 mm stroke.
Fixture Clamping
Holds thick steel plates against a machining stop, relying on the 20 mm piston rod to resist deflection during milling.
Pallet Diverter
Pushes loaded pallets onto a secondary conveyor line, taking advantage of the compact riveted body to fit within tight side-frame clearances.
Is the Airtac SSA Single-Acting Compact Cylinder SSA50X20S the Right Cylinder?
When sizing this model, compare its 874.7 N net push at 0.5 MPa against adjacent bores: the SSA40 yields 545.6 N, while the SSA63 provides 1382.6 N. A practical safe working load is roughly 525 N (about 60 percent of the 0.5 MPa figure), allowing a vertical lift of approximately 44.6 kg with a 2:1 safety margin.
The standard stroke ceiling is 30 mm, so this 20 mm unit fits easily. Operating pressure must be 0.2-1.0 MPa, as at least 0.2 MPa is required to overcome the return spring. If air pressure drops, the spring drives the rod back to rest and cannot hold a mid-stroke load. Configuration confirmed: 50 mm bore, 20 mm stroke, PT1/4 port, female M10x1.5 rod thread, and -S magnet included.
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 SSA50X20S FAQ
The net push force is 874.7 N at 0.5 MPa and 1267.4 N at 0.7 MPa. These values already account for the internal return spring, giving you the true output available for your application.
No. It is a single-acting push type where the spring retracts the rod when air is released. The spring drives the rod to its rest position on air loss, so an external rod lock or a double-acting SDA cylinder is required for mid-stroke load holding.
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