Airtac SAI125 Standard Air Cylinder SAI125X425S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X425S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X425S
The AirTAC SAI125X425-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a push force of 6136 N at 0.5 MPa, this 125mm bore unit is built to handle substantial loads over its 425mm stroke. The extruded aluminum barrel design eliminates tie rods, providing a clean exterior while maintaining strict dimensional interchangeability with other ISO 15552 cylinders.
This specific configuration includes a standard carbon steel piston rod and a built-in magnet (-S) for seamless integration with CMSE or DMSE reed switches. The dual sensor grooves machined into both sides of the barrel allow highly flexible switch mounting, ensuring precise end-of-stroke detection in complex machinery.
Airtac SAI125 Standard Air Cylinder SAI125X425S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X425S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAI125X425S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAI125X425S Is Used
Heavy Stamping
Provides the 6136 N push force required to actuate large mechanical presses and form rigid metal components securely.
Pallet Diverting
Drives robust diverters on high-mass packaging lines, moving fully loaded pallets smoothly across 425mm transitions.
Automated Welding
Positions heavy welding fixtures accurately, using the integrated magnet and dual sensor grooves for reliable stroke endpoints.
Is the Airtac SAI125 Standard Air Cylinder SAI125X425S the Right Cylinder?
Selecting this 125mm bore provides 6136 N of thrust at 0.5 MPa, offering a significant step up from the 80mm bore which yields 2513 N under the same pressure. If an application requires less force to save space and air consumption, stepping down to the 80mm or 100mm options is recommended.
Because the 425mm stroke creates a long extension, the standard carbon steel rod is susceptible to bending under side loads. To prevent premature rod-bearing wear, implement an external guide rail or utilize a dedicated guided cylinder. Note that this standard cylinder relies on adjustable air cushions at both ends to decelerate the piston; it will not hold a load vertically if air pressure is lost. For fail-safe position holding, specify the SAIL variant with an air-released lock or the BSAI clamp-lock version.
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 SAI125X425S FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
No, the standard SAI cylinder drifts when air pressure is removed. The adjustable air cushion only decelerates the piston near the stroke end. For load holding, use the SAIL variant with a lock or the BSAI bidirectional clamp-lock.
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