Airtac SAI125 Standard Air Cylinder SAI125AX850
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX850 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 SAI125AX850
The AirTAC SAI125X850 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It generates 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa, making it well-suited for moving substantial masses across its 850 mm travel. The extruded aluminum barrel design omits tie rods for a clean exterior while maintaining strict dimensional interchangeability with other ISO 15552 profile cylinders.
This specific configuration features a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance in humid or washdown environments. It utilizes PT tapered port threading (G1/2) and lacks a piston magnet. If your application requires position sensing, you must specify the -S option to equip the dual sensor grooves for CMSE or DMSE switches.
Airtac SAI125 Standard Air Cylinder SAI125AX850 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX850 |
|---|---|
| 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 SAI125AX850
| 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 SAI125AX850 Is Used
Heavy Stamping Press
Provides the high clamping force needed to hold large metal blanks in place during heavy stamping operations.
Pallet Diverting
Actuates heavy-duty diverter arms on packaging lines to route large pallets at high throughput speeds.
Automated Welding
Positions large automotive subframes into robotic welding cells, utilizing the 850 mm stroke for wide clearance.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX850 the Right Cylinder?
With an 850 mm stroke, this 125 mm bore cylinder operates at the upper end of the standard stroke range (max standard 1500 mm). At this length, the unsupported rod is highly susceptible to bending under side loads. To prevent premature rod-bearing wear and seal failure, always guide the load externally or utilize a guided cylinder carriage. The operating speed for this bore is 30-500 mm/s, slightly lower than smaller bores to manage the kinetic energy of the large piston mass.
If 6136 N of thrust at 0.5 MPa is insufficient, stepping up to the 160 mm bore yields 10053 N. For applications that must hold a load vertically without constant air pressure, the standard SAI will drift and drop; select the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock cylinder instead. This model is a direct drop-in replacement per ISO 15552 mounting dimensions, compatible with FA/FB flanges, CA/CB clevises, and TC trunnion accessories.
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 SAI125AX850 FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X850 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, 850 mm stroke, and G1/2 port.
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