Airtac SAI125 Standard Air Cylinder SAI125BX275S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX275S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX275S
The AirTAC SAI125X275-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty positioning. It supplies 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for high-mass automation tasks requiring a 275 mm travel distance. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that conforms to standard ISO 15552 mounting dimensions.
This specific configuration includes a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. It is equipped with a magnet (-S) for proximity sensing via CMSE or DMSE switches mounted in the dual-side sensor grooves. Fluid ports feature PT tapered threads, and adjustable air cushions at both ends absorb kinetic energy at a maximum operating speed of 30-500 mm/s.
Airtac SAI125 Standard Air Cylinder SAI125BX275S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX275S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAI125BX275S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAI125BX275S Is Used
Heavy Stamping
Provides the 6136 N push force required to actuate large mechanical stamping presses and heavy metal forming dies.
Pallet Transfer
Lifts and redirects loaded pallets along high-capacity conveyor lines, utilizing the 275 mm stroke to clear packaging boundaries.
Automated Welding
Positions heavy welding fixtures with precise 275 mm travel, relying on the SUS304 rod for resistance against weld spatter.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX275S the Right Cylinder?
With a 125 mm bore generating 6136 N at 0.5 MPa, this model handles substantial loads. If your application requires less force, stepping down to an 80 mm bore yields 2513 N, while a 100 mm bore provides 3927 N. For 275 mm of travel, the standard stroke length is sufficient, but always verify that your load is guided to prevent side-load bending on the rod bearing.
This cylinder is dimensionally interchangeable per ISO 15552, allowing it to serve as a drop-in replacement for other ISO 15552 profile cylinders. Key specifications include a 125 mm bore, 275 mm stroke, PT G1/2 port, and compatibility with FA/FB flanges or TC trunnion mounts. Note that the standard double-acting design relies on live air pressure to hold position; if the system exhausts, the piston will drift. For fail-safe load holding without continuous pressure, consider the SAIL variant with an air-released lock or the BSAI bidirectional clamp-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 SAI125BX275S FAQ
At a 0.5 MPa operating pressure, the SAI125X275-S cylinder delivers a push force of 6136 N and a pull force of 5734 N. The theoretical maximum force at 1.0 MPa is 1251 kgf.
Yes, the SAI is a genuine ISO 15552 profile cylinder, meaning its mounting interface and envelope dimensions are interchangeable with other ISO 15552 standard cylinders, allowing for seamless drop-in replacement.
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