Airtac SAI125 Standard Air Cylinder SAI125AX850S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX850S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX850S
The AirTAC SAI125X850-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a substantial push force of 8590 N at 0.7 MPa, making it well-suited for demanding industrial pressing and lifting tasks over its 850 mm stroke.
This variant includes a magnet for position sensing and uses a SUS420J2 stainless steel rod for enhanced corrosion resistance. The barrel features dual sensor grooves compatible with CMSE and DMSE switches, while the PT tapered ports ensure a robust pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125AX850S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX850S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAI125AX850S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAI125AX850S Is Used
Heavy-Duty Stamping
Provides the 8590 N force at 0.7 MPa required to drive heavy metal forming and stamping assemblies.
Large Mold Handling
The 850 mm stroke accommodates the long extension needed to shift substantial injection molds along production lines.
Pallet Diverting
Pushes fully loaded pallets on high-throughput conveyors where lower bore cylinders cannot provide the necessary push force.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX850S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when 50 mm or 63 mm models lack the necessary thrust, such as the 63 mm bore which offers 2182 N at 0.7 MPa. Because this model features an 850 mm stroke, the extended rod is highly susceptible to bending under side loads; utilize an external guide rail or a guided cylinder to prevent premature rod-bearing wear.
This unit is dimensionally interchangeable with other ISO 15552 profile cylinders. For applications requiring the load to remain stationary without continuous air pressure, the standard SAI will drift; integrate the SAIL locking variant or an external pilot-operated check valve to secure the payload safely.
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 SAI125AX850S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates a push force of 8590 N and a pull force of 5734 N. It achieves a maximum theoretical force of 1251 kgf at 1.0 MPa.
Yes, the SAI125X850-S shares standardized ISO 15552 mounting dimensions, allowing it to serve as a drop-in replacement for comparable profile cylinders. It features a G1/2 port and utilizes PT tapered threading.
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