Airtac SAI125 Standard Air Cylinder SAI125BX70
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX70 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX70
The AirTAC SAI125X70 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers 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 clamping and pressing tasks within its 70 mm stroke. The extruded aluminum barrel omits traditional tie-rods, providing a clean exterior that resists contamination.
This specific configuration includes a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh or washdown environments. Fluid ports feature PT tapered threads. Because no magnet is specified (-S omitted), it operates without electronic position sensing, relying purely on mechanical end-of-stroke cushioning to decelerate loads at both ends.
Airtac SAI125 Standard Air Cylinder SAI125BX70 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX70 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAI125BX70
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAI125BX70 Is Used
Heavy-Duty Stamping
Provides the 6136 N force at 0.5 MPa required to form and stamp thick metal components in automated fabrication cells.
Injection Mold Clamping
Secures large injection molding tools and heavy industrial fixtures reliably during high-pressure production cycles.
Robotic Material Forming
Drives robust forming and bending presses where a short 70 mm stroke must deliver maximum kinetic impact and holding power.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX70 the Right Cylinder?
Selecting this 125 mm bore provides massive thrust for heavy payloads; stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, which may be insufficient for large mold handling. Conversely, moving up to a 160 mm bore yields 10053 N if your application requires extreme pressing power.
At a 70 mm stroke, side-load bending stress on the rod bearing is minimal, so no external guide rail is strictly necessary. However, operators must note that the standard adjustable air cushions only decelerate the piston near stroke ends—they do not lock the load. If pressure drops, the rod drifts. For fail-safe holding, integrate an external pilot-operated check valve or specify the SAIL variant. As a true ISO 15552 profile cylinder, it drops into existing mounting interfaces using standard FA/FB flanges or TC trunnions.
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 SAI125BX70 FAQ
At 0.5 MPa, the SAI125X70 delivers 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 SAI125X70 is dimensionally interchangeable per ISO 15552. Its mounting interface and PT G1/2 ports align with standard ISO 15552 cylinders, allowing a direct drop-in replacement without altering your machine's mounting layout.
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