Airtac SAI125 Standard Air Cylinder SAI125AX425S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX425S 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 SAI125AX425S
The AirTAC SAI125X425-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a robust push force of 8590 N at 0.7 MPa and a pull force of 5734 N at 0.5 MPa. The 425 mm stroke provides substantial extension length for large-scale material handling and press operations.
This specific configuration includes a SUS420J2 stainless steel piston rod (material code A) for superior corrosion resistance in humid or mildly chemically washed environments. Equipped with a magnet (-S), the extruded aluminum barrel features sensor grooves on both sides for direct mounting of CMSE or DMSE reed switches. Fluid ports feature PT tapered threads, and adjustable air cushions at both ends absorb kinetic energy at stroke extremes.
Airtac SAI125 Standard Air Cylinder SAI125AX425S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX425S |
|---|---|
| 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 SAI125AX425S
| 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 SAI125AX425S Is Used
Heavy-Duty Stamping
Provides the 8590 N force required to actuate large mechanical presses and form heavy-gauge sheet metal components securely.
Automotive Assembly
Drives large robotic welding fixtures and positions heavy chassis sub-assemblies along the automotive production line.
Pallet Diversion
Extends 425 mm to push fully loaded pallets weighing several hundred kilograms onto secondary packaging conveyors.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX425S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when applications demand upward of 8590 N of thrust at 0.7 MPa but do not require the extreme 14074 N push force of the larger 160 mm bore variant. The 425 mm stroke falls within the standard maximum limit of 1500 mm for this bore size, making it highly versatile for mid-to-long reach tasks.
Because the stroke exceeds 300 mm, the unsupported rod length is significant. To prevent rod-bearing bending and premature seal wear under side load, implement an external guide rail or utilize a guided cylinder module. If the machinery requires the load to remain fixed during a complete loss of air pressure, a standard SAI cylinder will drift; you must integrate the SAIL locking variant or an external pilot-operated check valve. For drop-in retrofits, ensure the bore, 425 mm stroke, PT port, and mounting accessory match your existing ISO 15552 footprint.
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 SAI125AX425S 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 7736 N. The theoretical maximum force at 1.0 MPa is 1251 kgf.
Yes, the SAI125X425-S is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement for other ISO 15552 profile cylinders of the same bore and stroke, provided your mounting interface and PT port align.
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