Airtac SAI125 Standard Air Cylinder SAI125AX650
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX650 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX650
The AirTAC SAI125X650 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust push force of 8590 N at 0.7 MPa, this 125 mm bore actuator is built to handle substantial loads across its 650 mm stroke. The extruded aluminum barrel eliminates tie-rods, providing a clean profile while maintaining strict dimensional interchangeability with other ISO 15552 cylinders.
Equipped with a SUS420J2 stainless steel piston rod (material code A), this model offers superior resistance to moisture and corrosion compared to standard carbon steel. It features PT tapered G1/2 ports and adjustable air cushions at both ends to absorb impact. Note that this bore size operates at a controlled speed range of 30-500 mm/s to ensure structural stability during high-mass movements.
Airtac SAI125 Standard Air Cylinder SAI125AX650 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX650 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAI125AX650
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAI125AX650 Is Used
Heavy Machinery Forming
Provides the 8590 N push force required to actuate large forming presses and heavy industrial machinery over a 650 mm travel distance.
Pallet Diverting
Drives robust pallet diverters and heavy-duty material handling gates where high kinetic energy demands adjustable end-cushioning.
Automated Welding
Positions large automotive sub-assemblies in robotic welding cells, utilizing the SUS420J2 rod to resist weld spatter and plant humidity.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX650 the Right Cylinder?
Selecting the SAI125X650 is ideal when your application requires moving heavy payloads that exceed the 5497 N push force of the 100 mm bore variant. If the full 8590 N is unnecessary, stepping down reduces air consumption and physical footprint. For this 650 mm stroke, managing side load is critical; long unsupported rods are prone to bending under lateral forces. Implement an external guide rail or use a guided cylinder to prevent premature rod-bearing wear.
This actuator uses a PT G1/2 port and accepts standard ISO 15552 mounting accessories like TC trunnion or FA flange. Because it lacks a magnet (-S), it cannot host CMSE or DMSE proximity switches without modification. If your workflow requires the piston to maintain its position after a pressure loss, note that the standard air cushion only decelerates the stroke end and does not brake; you must integrate the SAIL locking variant or an external pilot-operated check valve for fail-safe holding.
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 SAI125AX650 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. At 0.5 MPa, the push force is 6136 N.
Yes, the SAI125X650 is a true ISO 15552 profile cylinder. Its mounting dimensions are fully interchangeable with other ISO 15552 cylinders, allowing for seamless drop-in replacement without modifying your existing machine tooling.
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