Airtac SAI125 Standard Air Cylinder SAI125X400S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X400S 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 SAI125X400S
The AirTAC SAI125X400-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a robust push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making it well-suited for moving substantial loads over its 400 mm stroke. The extruded aluminum barrel design omits tie-rods, offering a clean exterior that drops directly into standardized ISO 15552 mounting footprints.
Equipped with a magnet (-S), this model supports CMSE and DMSE sensor switches via integrated grooves on both sides of the barrel. It features a standard carbon steel piston rod and utilizes a PT tapered port thread. For environments requiring higher thermal resistance, the standard TPU seals can be swapped for Viton (H) to withstand elevated temperatures.
Airtac SAI125 Standard Air Cylinder SAI125X400S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X400S |
|---|---|
| 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 SAI125X400S
| 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 SAI125X400S Is Used
Heavy Stamping
Provides the 6136 N push force required to actuate large mechanical presses and form heavy-gauge metal components securely.
Injection Molding Extraction
Utilizes the 400 mm stroke and integrated magnet for reliable end-of-stroke detection when pulling large molded plastic parts from deep cavities.
Pallet Diversion
Leverages high pull force to actuate robust routing arms that redirect heavy pallets on automated high-throughput material handling lines.
Is the Airtac SAI125 Standard Air Cylinder SAI125X400S the Right Cylinder?
Selecting this 125 mm bore is ideal when 100 mm cylinders (providing 3927 N push at 0.5 MPa) lack the necessary thrust for high-inertia loads. At a 400 mm stroke, the extended piston rod is highly susceptible to bending under side loads. To prevent premature rod-bearing wear, implement an external guide rail or utilize a dedicated guided cylinder to absorb lateral forces.
This model serves as a dimensionally interchangeable replacement for other ISO 15552 cylinders, matching standard mounting accessories like TC trunnion or FA flange brackets. Remember that the adjustable air cushions only decelerate the piston at stroke ends; if the application must hold a vertical load safely without continuous air pressure, integrate an external pilot-operated check valve or select the SAIL locking variant.
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 SAI125X400S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X400-S is a true ISO 15552 profile cylinder. It is dimensionally interchangeable with ISO 15552 cylinders from other manufacturers, provided you match the 125 mm bore, 400 mm stroke, and mounting accessories.
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