Airtac SAI125 Standard Air Cylinder SAI125BX275
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX275 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 SAI125BX275
The AirTAC SAI125X275 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N of push force at 0.5 MPa, this 125 mm bore unit is built to move substantial masses. The 275 mm stroke provides the extended travel needed for large material handling tasks. Its extruded aluminum barrel omits tie-rods, creating a clean exterior that simplifies mounting and sensor placement.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. It utilizes PT tapered port threads and operates without a magnet. If your application requires end-position sensing, you would need the -S magnet variant to utilize CMSE or DMSE switches in the dual sensor grooves. For operations needing fail-safe holding, the SAIL variant offers an integrated air-released lock.
Airtac SAI125 Standard Air Cylinder SAI125BX275 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX275 |
|---|---|
| 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 SAI125BX275
| 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 SAI125BX275 Is Used
Heavy Stamping
Provides the high thrust required to actuate large presses and form heavy-gauge metal components securely.
Pallet Handling
Moves loaded pallets along transfer lines, utilizing the 275 mm stroke to push heavy loads onto diverter conveyors.
Large Clamp Fixtures
Secures oversized workpieces in machining cells, leveraging the SUS304 rod to resist coolant and washdown chemicals.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX275 the Right Cylinder?
Selecting this 125 mm bore is ideal when 100 mm cylinders (providing 3927 N at 0.5 MPa) lack the necessary thrust, but stepping up to a 160 mm bore is unnecessary. At a 275 mm stroke, the unsupported rod length is significant; side loads can cause rod-bearing bending and premature wear. To manage this, implement an external guide rail or use a dedicated guided cylinder to absorb lateral forces. Because this is a standard double-acting cylinder, it will not hold a load if air pressure drops or the valve centers—the piston will drift. For dead-load holding, specify the SAIL or BSAI clamp-lock variant, or add an external pilot-operated check valve.
As a true ISO 15552 standard cylinder, this model is dimensionally interchangeable with other ISO 15552 profile cylinders. To replicate this exact unit, match the 125 mm bore, 275 mm stroke, PT G1/2 port, and your preferred mounting accessory like the TC trunnion or LB foot bracket.
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 SAI125BX275 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes. The SAI125X275 is dimensionally interchangeable per ISO 15552 mounting interface dimensions, making it a drop-in replacement for other ISO 15552 profile cylinders, provided you match the bore, stroke, and port size.
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