Airtac SAI125 Standard Air Cylinder SAI125AX155S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX155S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX155S
The AirTAC SAI125X155-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust push force of 6136 N at 0.5 MPa, this 125 mm bore unit is tailored for moving substantial payloads. The 155 mm stroke provides the precise mid-range travel needed for clamping, pressing, and heavy lifting. This configuration includes an integrated magnet for position sensing.
Built with a durable SUS420J2 stainless steel piston rod, this variant offers superior corrosion resistance compared to standard carbon steel, making it ideal for humid or chemically exposed environments. It utilizes PT tapered port threads and operates at speeds of 30-500 mm/s. The extruded aluminum barrel features sensor grooves on both sides, allowing direct mounting of CMSE or DMSE switches without additional brackets.
Airtac SAI125 Standard Air Cylinder SAI125AX155S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX155S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAI125AX155S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAI125AX155S Is Used
Heavy-Duty Pressing
Ideal for stamping and pressing operations requiring high force, utilizing the 6136 N thrust to form or assemble rigid components securely.
Automotive Welding
The SUS420J2 stainless rod resists weld spatter and shop floor contaminants, making it highly suitable for holding heavy welding fixtures.
Pallet Diverting
Provides the robust actuation needed to divert heavy loaded pallets on conveyor lines, with dual-side sensor grooves allowing precise positioning feedback.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX155S the Right Cylinder?
Selecting this 125 mm bore is optimal when a 100 mm bore (providing 3927 N at 0.5 MPa) lacks the necessary thrust, but you want to avoid the larger footprint of a 160 mm cylinder. The 155 mm stroke is well below the 1500 mm maximum standard stroke, keeping the rod bearing stress low. For applications requiring the load to remain fixed during a complete air pressure loss, note that the standard adjustable air cushions only decelerate the piston at stroke ends. You must specify an external pilot-operated check valve or select the related SAIL (air-released lock) variant to prevent drift. As a true ISO 15552 profile cylinder, it serves as a drop-in replacement for any cylinder matching that standard's mounting interface and G1/2 port size.
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 SAI125AX155S FAQ
At a standard 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can reach up to 11045 N push force at 0.9 MPa.
Yes, the SAI125X155-S is a genuine ISO 15552 profile cylinder. Its standardized mounting dimensions and G1/2 port interface make it a drop-in replacement for other ISO 15552 cylinders, though you should confirm overall length tolerances from the datasheet.
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