Airtac SAI125 Standard Air Cylinder SAI125BX650S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX650S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX650S
The SAI125X650-S is a double-acting ISO 15552 profile cylinder engineered to deliver 6136 N of pushing force at 0.5 MPa. Its 650 mm stroke provides the extended travel necessary for large-scale material handling and heavy-duty positioning tasks.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance in harsh environments. It is equipped with a magnet for proximity sensing via CMSE or DMSE switches, and utilizes PT tapered port threads to ensure a robust pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125BX650S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX650S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAI125BX650S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAI125BX650S Is Used
Heavy Stamp Feeding
Provides the robust linear motion required to push heavy metal blanks or stamping materials into large-scale mechanical presses.
Pallet Diversion
Utilizes its 650 mm stroke and 6136 N force to index or divert heavy loaded pallets along high-capacity conveyor lines.
Automotive Component Handling
Ideal for shifting bulky automotive subassemblies or chassis components between robotic welding and machining stations.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX650S the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm bore (which yields 3927 N at 0.5 MPa) is necessary when your application requires moving heavy payloads well beyond the 4 kN threshold. For a 650 mm stroke, the unsupported rod length is substantial; side loads will cause bending and accelerated rod-bearing wear. Employing an external guide rail or a fully guided cylinder is strongly recommended to prevent mechanical failure.
Because it is a standard double-acting cylinder, the SAI125X650-S relies entirely on live air pressure to hold its position. If your circuit loses air or the valve centers, the load will drift downward. For fail-safe vertical holding, integrate a SAIL (pneumatic lock) variant or an external rod lock. As a true ISO 15552 profile cylinder, it serves as a dimensionally interchangeable drop-in replacement for other ISO 15552 actuators.
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 SAI125BX650S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes. The SAI series is a genuine ISO 15552 profile cylinder, meaning its mounting interface and physical dimensions are fully interchangeable with other ISO 15552 compliant cylinders. You can use the same mounting accessories and PT port connections.
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