Airtac SAI125 Standard Air Cylinder SAI125BX270S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX270S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX270S
The AirTAC SAI125X270-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a robust push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making it well-suited for moving substantial payloads through its 270 mm stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that simplifies mounting and sensor placement.
This specific configuration includes a piston magnet for use with CMSE and DMSE reed switches, which ride securely in the dual sensor grooves machined into both sides of the barrel. It is built with a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads to ensure a reliable, leak-free pneumatic connection in demanding industrial environments.
Airtac SAI125 Standard Air Cylinder SAI125BX270S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX270S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAI125BX270S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAI125BX270S Is Used
Heavy-Duty Stamping
Provides the necessary 6136 N of push force at 0.5 MPa to actuate large mechanical presses and form heavy-gauge metal components securely.
Pallet Diverting
Utilizes the 270 mm stroke and integrated magnet to push heavy pallets onto secondary packaging lines while tracking position via DMSE sensors.
Injection Mold Ejection
Leverages the SUS304 stainless steel rod to safely eject dense plastic parts from molds, resisting moisture and potential chemical exposure.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX270S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when an application demands thrust beyond the 3927 N provided by a 100 mm bore at 0.5 MPa, but does not yet require the massive 10053 N output of a 160 mm unit. Operating at a controlled speed range of 30-500 mm/s, it balances high power with manageable cycle times. Because the 270 mm stroke exceeds the 300 mm threshold where side loading becomes a primary concern, it is approaching the length where external guides should be evaluated.
For applications involving this stroke length, ensure the load is adequately supported by an external guide rail or a guided cylinder carriage to prevent rod-bearing bending and premature seal wear. This standard SAI variant relies entirely on air pressure to maintain its position; if the air supply is dropped or exhausted, the piston will drift. For dead-end holding without live pressure, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant. As a true ISO 15552 profile cylinder, it serves as a drop-in replacement for other ISO 15552 cylinders, matching standard mounting dimensions for FA flanges, LB foot brackets, and 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 SAI125BX270S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
Yes, the SAI125X270-S is dimensionally interchangeable per ISO 15552 standards. You can drop it in as a replacement for other ISO 15552 profile cylinders with a 125 mm bore, 270 mm stroke, and matching PT port and mounting accessories.
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