Airtac SAI125 Standard Air Cylinder SAI125AX400S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX400S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX400S
The AirTAC SAI125X400-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a substantial push force of 6136 N at just 0.5 MPa, this 125mm bore unit is built to drive high-mass payloads through its 400mm stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that resists contamination while maintaining strict ISO mounting interchangeability.
This specific configuration features 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), it integrates seamlessly with CMSE and DMSE sensor switches housed in the dual-side barrel grooves. Fluid ports feature PT tapered threads, and the standard adjustable air cushions at both ends ensure smooth deceleration of heavy loads within the 30-500 mm/s speed range.
Airtac SAI125 Standard Air Cylinder SAI125AX400S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX400S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAI125AX400S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAI125AX400S Is Used
Heavy Stamping & Forming
Provides the 6136N push force at 0.5MPa required to drive large metal forming and heavy-duty stamping presses through a 400mm travel distance.
Pallet Transfer Systems
Shifts heavy loaded pallets along conveyor lines, utilizing the integrated magnet and CMSE sensors to confirm full extension in automated packaging cells.
Large Mold Clamping
Secures oversized injection molds or heavy industrial fixtures, relying on the robust 125mm bore and SUS420J2 stainless rod to withstand plant environments.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX400S the Right Cylinder?
Selecting this 125mm bore over a smaller 100mm option provides a significant leap in power, jumping from 3927 N to 6136 N of push force at 0.5 MPa, which is critical for moving heavy jigs or clamping large molds. If your application requires less energy, stepping down to an 80mm bore yields 2513 N and saves space. Because this model features a 400mm stroke, the extended rod is highly susceptible to bending under side loads; utilize an external linear guide or a fully guided cylinder to prevent premature rod-bearing failure.
For drop-in ISO 15552 replacements, verify the 125mm bore, 400mm stroke, PT G1/2 port size, and your required mounting accessory (such as an LB foot or TC trunnion). Note that the adjustable end cushions only decelerate the piston near stroke endpoints; they do not hold a load. If your machinery must maintain vertical position during a pressure loss, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant instead of relying on a standard cylinder.
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 SAI125AX400S FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of theoretical force.
No, the standard SAI125X400-S cannot hold a load if air pressure is lost. The adjustable air cushions only slow the piston at the end of the stroke and do not act as a brake. For position holding, use the SAIL lock variant or an external pilot-operated check valve.
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