Airtac SAI125 Standard Air Cylinder SAI125BX85S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX85S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX85S
The AirTAC SAI125X85-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a push force of 6136 N at 0.5 MPa, this 125 mm bore unit is built to move substantial masses with reliability. The 85 mm stroke provides compact actuation for high-force, short-travel tasks.
This configuration includes a SUS304 stainless steel rod for superior corrosion resistance in washdown or chemically exposed environments. It features a built-in magnet for use with CMSE and DMSE sensor switches, and utilizes PT tapered ports to ensure a robust, leak-free pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125BX85S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX85S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAI125BX85S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAI125BX85S Is Used
Heavy Stamping
Provides the necessary 6136 N push force at 0.5 MPa for short-stroke pressing, riveting, and metal forming operations.
Mold Clamping
Secures large injection molds or heavy industrial fixtures with a compact 85 mm stroke and robust SUS304 rod.
Pallet Lift Stops
Acts as a high-force stopper mechanism in automated conveyor lines, absorbing the impact of heavy loaded pallets.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX85S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) cannot generate enough push force for your heavy fixtures. If your application requires less than 6000 N, stepping down to the 100 mm bore saves space and air consumption. Because this is a double-acting cylinder, it relies on live air pressure to move and hold the rod; it will drift if pressure is lost. For applications requiring true mechanical holding without air pressure, select the SAIL or BSAI locking variants.
To replace this unit with another ISO 15552 cylinder, match the 125 mm bore, 85 mm stroke, PT port thread, and your preferred mounting accessory (such as LB foot or TC trunnion). The integrated magnet (-S) allows for direct drop-in compatibility with existing CMSE/DMSE sensor setups.
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 SAI125BX85S FAQ
At a standard operating pressure of 0.5 MPa, the 125 mm bore generates a push force of 6136 N and a pull force of 5734 N. It can reach up to 8590 N push force at 0.7 MPa.
Yes, this profile cylinder is dimensionally interchangeable per ISO 15552. You can drop-in replace other ISO 15552 cylinders by matching the 125 mm bore, 85 mm stroke, PT port, and mounting accessories.
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