Airtac SAI125 Standard Air Cylinder SAI125BX375S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX375S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX375S
The AirTAC SAI125X375-S 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 unit is built to drive substantial loads across its 375 mm stroke. The extruded aluminum barrel omits tie-rods, providing a clean profile that drops directly into standardized ISO 15552 mounting interfaces.
Equipped with a -S magnet, this model supports CMSE and DMSE sensor switches via the dual side grooves on the barrel. Per your configuration, it features a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes PT tapered port threads. The standard TPU seals accommodate operating temperatures from -20 to +70 C, while adjustable air cushions at both ends absorb end-of-stroke impact.
Airtac SAI125 Standard Air Cylinder SAI125BX375S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX375S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAI125BX375S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAI125BX375S Is Used
Heavy Stamping Press
Drives large forming dies and heavy stamping presses where 8590 N of push force at 0.7 MPa is required to shape thick metal sheets.
Pallet Diversion
Actuates heavy-duty pallet diverters and alignment gates on high-capacity conveyor lines, utilizing the 375 mm stroke to clear wide loads.
Automated Guided Cart Lift
Raises and lowers heavy automated guided vehicle carts, relying on the SUS304 stainless steel rod to withstand harsh warehouse environments.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX375S the Right Cylinder?
Selecting this 125 mm bore is appropriate when 80 mm cylinders lack the necessary thrust, offering a significant jump from 3518 N to 8590 N push force at 0.7 MPa. Conversely, if your application requires less than 6000 N, stepping down to an 80 mm bore reduces air consumption and physical footprint. This 375 mm stroke provides extended reach for pushing, lifting, or clamping heavy assemblies.
Because the stroke exceeds 300 mm, side loads can induce rod-bearing bending and premature wear. Utilize external guide rails or a guided cylinder carriage to support the load and prevent rod deflection. Note that the standard adjustable air cushion only decelerates the piston at stroke ends; it does not lock the rod. If the application must hold a vertical load without constant air pressure, integrate the SAIL (air-released lock) variant or an external pilot-operated check valve. For replacements, match the 125 mm bore, 375 mm stroke, G1/2 port, and the appropriate mounting accessory like an FA flange or TC trunnion.
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 SAI125BX375S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder provides a push force of 8590 N and a pull force of 5734 N. At 0.9 MPa, the push force increases to 11045 N.
Yes, the SAI125X375-S is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement for other ISO 15552 profile cylinders by matching the 125 mm bore, 375 mm stroke, G1/2 port, and mounting accessories.
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