Airtac SAI125 Standard Air Cylinder SAI125BX20S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX20S 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 SAI125BX20S
The AirTAC SAI125X20-S is a double-acting ISO 15552 profile cylinder engineered for high-force applications requiring minimal travel. Operating at 0.5 MPa, it generates a substantial 6136 N of push force and 5734 N of pull force. This 20 mm stroke is a non-standard, made-to-order length tailored for compact clamping or short ejection tasks.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in washdown or chemically aggressive environments. It includes a standard magnet for position sensing, utilizing the dual sensor grooves on the aluminum barrel to seamlessly integrate CMSE or DMSE reed switches. Threaded PT tapered ports ensure a robust, leak-free pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125BX20S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX20S |
|---|---|
| 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 SAI125BX20S
| 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 SAI125BX20S Is Used
High-Force Short Clamping
Ideal for securing heavy steel workpieces during machining, utilizing the 6136 N push force within a tight 20 mm stroke to lock components rigidly.
Rapid Ejection Station
Delivers powerful, short-throw ejection of finished parts from hydraulic presses, taking advantage of the 5734 N pull force and SUS304 rod durability.
Washdown Pinch Valving
The SUS304 rod and high thrust output make this cylinder perfect for actuating heavy-duty pinch valves in food processing or chemical washdown environments.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX20S the Right Cylinder?
Selecting this 125 mm bore is ideal when a system demands high thrust within a very short stroke envelope. If the application requires slightly less force, stepping down to the 100 mm bore yields 3927 N of push force at 0.5 MPa, which may better suit lighter duty cycles. Conversely, upgrading to the 160 mm bore provides 10053 N for heavy-duty pressing.
Because the stroke is only 20 mm, side-load stress on the rod bearing is minimal, though external guides are always recommended for perfectly square ejection. Note that the standard SAI does not hold a load upon air loss; for fail-safe position holding, consider the SAIL (air-released lock) variant or an external pilot-operated check valve. This model is dimensionally interchangeable per ISO 15552, meaning it serves as a drop-in replacement for other ISO 15552 profile cylinders with identical 125 mm bore, 20 mm stroke, PT port, and standard mounting accessory footprints.
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 SAI125BX20S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
Yes, the SAI125X20-S is a genuine ISO 15552 profile cylinder, making it dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke. It matches standard mounting interface dimensions for accessories like FA flanges and TC trunnions.
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