Airtac SAI125 Standard Air Cylinder SAI125X900S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X900S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X900S
The AirTAC SAI125X900-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a substantial push force of 6136 N at 0.5 MPa and reaches 8590 N at 0.7 MPa, making it well-suited for moving large masses over its 900 mm stroke. The extruded aluminum barrel omits traditional tie rods while retaining the exact ISO 15552 mounting interface for seamless interchangeability.
This specific configuration includes a standard carbon steel piston rod and a built-in magnet (-S) for position sensing. The dual sensor grooves machined into both sides of the barrel accept CMSE or DMSE reed switches, streamlining automation feedback. It features tapered PT port threads and adjustable air cushions at both ends to manage piston deceleration.
Airtac SAI125 Standard Air Cylinder SAI125X900S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X900S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAI125X900S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAI125X900S Is Used
Heavy-Duty Stamping
Generates 8590 N of thrust at 0.7 MPa to drive large metal forming and heavy stamping presses.
Bulk Material Diversion
Leverages the 900 mm stroke to pivot large bulk material diverter gates on high-throughput aggregate conveyors.
Automotive Assembly Lifts
Raises and lowers heavy chassis subframes during automated automotive welding and assembly operations.
Is the Airtac SAI125 Standard Air Cylinder SAI125X900S the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm version upgrades your thrust from 3927 N to 6136 N at 0.5 MPa, which is critical when scaling up clamping or lifting capacity. At a 900 mm stroke, the extended rod is highly susceptible to bending under side loads; utilizing an external guide rail or a fully guided cylinder carriage is mandatory to prevent premature rod-bearing wear.
Because it adheres to the ISO 15552 dimensional standard, this cylinder serves as a drop-in replacement for other ISO 15552 profile cylinders. To match this exact configuration, specify a 125 mm bore, 900 mm stroke, G1/2 port, the required mounting accessory (such as a CA clevis), and ensure the -S magnet option is included for sensor compatibility. Note that standard air cushions only decelerate the piston; they do not lock the rod. If your application requires dead-load holding without air pressure, specify the SAIL (air-released lock) variant or use an external pilot-operated check valve.
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 SAI125X900S FAQ
The cylinder provides a push force of 6136 N at 0.5 MPa and 8590 N at 0.7 MPa. The pull force at 0.5 MPa is 5734 N.
No, the standard SAI cylinder cannot hold a load without live pressure. The adjustable air cushions only decelerate the piston at stroke ends; they do not function as a brake. For fail-safe load holding, use the SAIL variant with an air-released lock or an external rod lock mechanism.
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