Airtac SAI125 Standard Air Cylinder SAI125BX40
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX40
The AirTAC SAI125X40 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty tasks, delivering a robust push force of 6136 N and a pull force of 5734 N at 0.5 MPa. Its short 40 mm stroke is optimal for high-force clamping, riveting, or pressing operations within confined spaces. Built with a PT tapered port thread and an extruded aluminum barrel, it ensures reliable pneumatic performance.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance in harsh environments. While it lacks a magnet for position sensing, the barrel retains sensor grooves on both sides for external proximity switches. For applications requiring fail-safe load holding without air pressure, consider the related SAIL or BSAI clamp-lock variants.
Airtac SAI125 Standard Air Cylinder SAI125BX40 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAI125BX40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAI125BX40 Is Used
Heavy-Duty Stamping
Provides the 6136 N push force required to seat bearings or stamp heavy-gauge metal components in short, powerful bursts.
Industrial Riveting
Applies consistent 0.5 MPa riveting force to fasten thick structural steel plates securely in automated fabrication cells.
Rugged Material Clamping
Holds large, irregular workpieces firmly in place during aggressive machining or welding processes.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX40 the Right Cylinder?
Choose this 125 mm bore when 100 mm (3927 N push at 0.5 MPa) is insufficient for your high-tonnage short-stroke cycle. The PT porting and G1/2 thread interface match standard ISO 15552 mounting dimensions, allowing seamless interchangeability with other ISO 15552 profile cylinders. Pair it with TC trunnion or FA flange mounts to handle the substantial reaction forces generated during pressing.
Because the stroke is only 40 mm, rod-bearing side-load bending is minimal compared to longer strokes. However, remember that a standard SAI cylinder relies on live air pressure to maintain position; the adjustable air cushions at both ends only decelerate the piston near stroke end and do not act as a mechanical brake or lock.
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 SAI125BX40 FAQ
At 0.5 MPa operating pressure, the SAI125X40 exerts 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 SAI125X40 features a standard ISO 15552 mounting interface and G1/2 port, making it dimensionally interchangeable with other ISO 15552 profile cylinders without altering your existing machinery layout.
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