Airtac SAI125 Standard Air Cylinder SAI125BX85
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX85 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 SAI125BX85
The AirTAC SAI125X85 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a substantial push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making it well-suited for high-thrust tasks over its 85 mm stroke. The extruded aluminum barrel design omits tie rods, ensuring a clean exterior that resists debris accumulation.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in humid or washdown environments. It utilizes PT tapered port threads, and because no magnet is specified, it operates without integrated position sensing. For applications requiring end-of-stroke locking, the SAIL variant offers an air-released brake mechanism.
Airtac SAI125 Standard Air Cylinder SAI125BX85 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX85 |
|---|---|
| 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 SAI125BX85
| 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 SAI125BX85 Is Used
Heavy Stamping
Provides the robust 6136 N push force required to actuate large mechanical presses and form rigid metal components.
Injection Molding Extraction
Utilizes its SUS304 rod and high thrust to reliably pull heavy molded parts out of industrial injection molding machinery.
Pallet Handling
Drives heavy-duty lifting and positioning mechanisms for loaded pallets where substantial pulling power is essential.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX85 the Right Cylinder?
Select this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) cannot generate the required thrust. If the 6136 N output exceeds your application needs, stepping down prevents wasted energy and reduces physical footprint. This 85 mm stroke is compact enough to avoid significant rod-bearing bending, though external guides should always support the load to prevent side-load wear.
As a dimensionally interchangeable ISO 15552 cylinder, this model serves as a drop-in replacement for other standard profile cylinders sharing the same 125 mm bore, 85 mm stroke, PT port, and mounting accessory dimensions. Note that a standard SAI relies on continuous air pressure to maintain its position; if pneumatic supply is lost, the piston will drift. For dead-end holding without live pressure, consider the BSAI bidirectional clamp-lock 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 SAI125BX85 FAQ
At an operating pressure of 0.5 MPa, this 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.
No, the standard SAI cylinder relies on adjustable air cushions to decelerate the piston at stroke ends, not to hold loads. If pressure is lost, the piston will drift. For secure position holding without air pressure, use the SAIL lock variant or an external rod lock.
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