Airtac SAI125 Standard Air Cylinder SAI125BX125S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX125S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX125S
The AirTAC SAI125X125-S is a double-acting ISO 15552 profile cylinder featuring a 125mm bore and 125mm stroke. It delivers a substantial 6136N push force at 0.5 MPa, making it well-suited for heavy-duty pressing and high-thrust automation tasks. This specific configuration includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and a magnet for position sensing.
The extruded aluminum barrel includes sensor grooves on both sides, allowing seamless integration of CMSE or DMSE reed switches. Fluid supply is routed via PT tapered ports, and the adjustable air cushions at both ends ensure smooth deceleration of large payloads within the 30-500 mm/s speed range.
Airtac SAI125 Standard Air Cylinder SAI125BX125S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX125S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAI125BX125S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAI125BX125S Is Used
Heavy-Duty Pressing
Provides 6136N of thrust at 0.5 MPa for assembling bearings, bushings, and heavy mechanical components.
Automated Forming
Ideal for metal bending, stamping, and forming operations requiring high force and smooth cushioned stops.
Pallet Stopping
Acts as a robust stopper or diverter in high-mass conveyor lines, utilizing the -S magnet for timing confirmation.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX125S the Right Cylinder?
Select this 125mm bore model when an application requires over 6000N of thrust at 0.5 MPa but does not need the full 10053N output of the 160mm bore variant. The integrated magnet (-S) is essential if your control system requires end-of-stroke confirmation via CMSE or DMSE switches. Because the stroke is 125mm, side-load stress on the rod bearing is minimal compared to longer strokes, but always verify load alignment.
This cylinder relies on live air pressure to maintain its position; it will drift if pressure is lost. For applications requiring mechanical load holding during air failure, consider the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variants. As a genuine ISO 15552 profile cylinder, it serves as a direct dimensional drop-in replacement for other ISO 15552 standard cylinders.
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 SAI125BX125S FAQ
At 0.5 MPa, the push force is 6136N and the pull force is 5734N. At 0.7 MPa, the push force increases to 8590N.
No, the standard SAI cylinder relies on air pressure and will drift if pressure is removed. For fail-safe load holding, use the SAIL or BSAI variants.
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