Airtac SAI125 Standard Air Cylinder SAI125BX400S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX400S 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 SAI125BX400S
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 simplifies the mounting of accessories.
This specific configuration includes a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. Equipped with a magnet (-S), it seamlessly integrates with CMSE and DMSE sensor switches housed in the dual side grooves. It also features adjustable air cushions at both ends to decelerate the piston smoothly, operating efficiently at speeds of 30-500 mm/s.
Airtac SAI125 Standard Air Cylinder SAI125BX400S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX400S |
|---|---|
| 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 SAI125BX400S
| 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 SAI125BX400S Is Used
Heavy Stamping
Provides the necessary 6136 N push force at 0.5 MPa to actuate large mechanical presses and form heavy-gauge metal components.
Material Lifters
Utilizes its 400 mm stroke and robust pull force to elevate and lower heavy pallets or structural frames within automated manufacturing cells.
Bulk Diverters
Handles the redirection of heavy bulk materials or large workpieces on assembly lines, benefiting from the 30-500 mm/s operational speed range.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX400S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when an 80 mm bore (providing 2513 N push at 0.5 MPa) is insufficient, but a 160 mm bore (delivering 10053 N) would be excessive. For a 400 mm stroke, the extended piston rod is susceptible to bending under side loads; utilizing an external guide rail or a guided cylinder mechanism is strongly recommended to prevent premature rod-bearing wear.
As a dimensionally interchangeable ISO 15552 profile cylinder, it serves as a drop-in replacement for other standard cylinders matching this interface. To match this exact unit, specify a 125 mm bore, 400 mm stroke, PT tapered port thread, and the -S magnet option. Note that if pneumatic pressure is lost, the standard SAI cannot hold a load; apply the SAIL or BSAI variant if fail-safe locking is required.
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 SAI125BX400S 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, making its mounting dimensions fully interchangeable with other standard ISO 15552 cylinders. Ensure your setup specifies the PT port thread and the -S magnet option for an exact match.
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