Airtac SAI125 Standard Air Cylinder SAI125BX300S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX300S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX300S
The AirTAC SAI125X300-S is a double-acting ISO 15552 profile cylinder built for heavy-duty automation. It delivers a robust push force of 6136 N at 0.5 MPa and operates efficiently within a 30-500 mm/s speed range. The 300 mm stroke provides ample extension for substantial linear movement tasks.
This specific configuration includes a SUS304 stainless steel piston rod for superior corrosion resistance in harsh environments. It features PT tapered ports (G1/2) and comes equipped with a magnet (-S) for seamless integration with CMSE or DMSE sensor switches along the dual grooves on the extruded aluminum barrel.
Airtac SAI125 Standard Air Cylinder SAI125BX300S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX300S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAI125BX300S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAI125BX300S Is Used
Heavy Stamping
Provides the substantial 6136 N thrust required to actuate large mechanical presses and form thick metal components reliably.
Bulk Material Diverting
Leverages the 300 mm stroke to push heavy pallets or bulk material diverters across wide industrial conveyor belts.
Large Mold Handling
Shifts substantial injection molds or tooling fixtures into position on machining centers with precise control.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX300S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (3927 N at 0.5 MPa) lacks the necessary thrust, but you want to avoid stepping up to a 160 mm bore (10053 N at 0.5 MPa) which adds unnecessary mass. The 300 mm stroke requires careful mounting to prevent rod-bearing bending under side loads; utilizing external guides or a dedicated guided cylinder mechanism is highly recommended for optimal longevity.
As a standard double-acting cylinder, this model relies on continuous air pressure to hold its position. If your application requires the load to remain securely locked during a pressure drop or emergency stop, consider the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock cylinder. This SAI model is dimensionally interchangeable per ISO 15552, offering a drop-in replacement for other standard profile cylinders.
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 SAI125BX300S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. It can reach up to 8590 N push at 0.7 MPa.
Yes, the SAI125X300-S is dimensionally interchangeable per ISO 15552. You can use it as a drop-in replacement for other ISO 15552 profile cylinders, matching the 125 mm bore, 300 mm stroke, and G1/2 port.
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