Airtac SAI125 Standard Air Cylinder SAI125X20S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X20S
The AirTAC SAI125X20-S is a double-acting ISO 15552 profile cylinder engineered for high-force, short-stroke applications. It delivers a robust 6136 N of push force at 0.5 MPa, making it ideal for heavy-duty pressing and clamping tasks within a very compact 20 mm stroke. The extruded aluminum barrel design omits tie rods, providing a clean, standardized mounting interface that drops in seamlessly with other ISO 15552 cylinders.
This specific configuration includes a standard carbon steel piston rod and PT tapered port threads for reliable, leak-free pneumatic connections. Equipped with a magnet (-S), it directly supports CMSE and DMSE series sensor switches via the integrated dual-side sensor grooves on the barrel. For applications requiring position holding without continuous air pressure, consider the SAIL or BSAI locking variants.
Airtac SAI125 Standard Air Cylinder SAI125X20S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAI125 Standard Air Cylinder SAI125X20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAI125 Standard Air Cylinder SAI125X20S Is Used
Heavy-Duty Stamping
Provides 6136 N of thrust at 0.5 MPa for short-stroke metal stamping, forming, and riveting operations where a compact footprint is required.
Product Ejection
Ideal for ejecting heavy components or pallets from conveyor lines, utilizing the 20 mm stroke for rapid, high-impact cycling.
Pallet Clamping
Secures large pallets or heavy workpieces during machining or transfer, using the integrated magnet for precise end-of-stroke position verification.
Is the Airtac SAI125 Standard Air Cylinder SAI125X20S the Right Cylinder?
Selecting this 125 mm bore model is optimal when your application requires substantial thrust within a minimal stroke envelope. If the 6136 N push force at 0.5 MPa exceeds your actual load requirements, stepping down to the 100 mm bore variant reduces physical size and air consumption while still providing 3927 N. Conversely, if higher force is needed, the 160 mm bore offers 10053 N at the same pressure.
Because the stroke is only 20 mm, rod-bearing bending and side-load issues are practically negligible compared to longer strokes. However, for heavy offset loads, always utilize external guide rails to prevent premature seal wear. This cylinder uses a G1/2 port and M20x1.5 rod thread. Remember that the adjustable air cushions at both ends decelerate the piston near stroke end but do not function as a mechanical lock; external pilot-operated check valves are required for drop prevention.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAI125 Standard Air Cylinder SAI125X20S FAQ
At 0.5 MPa operating pressure, the SAI125X20-S generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X20-S is a genuine AirTAC profile cylinder built to ISO 15552 dimensional standards. Its mounting interface is fully interchangeable with other ISO 15552 cylinders, utilizing a G1/2 port and M20x1.5 rod thread.
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