Airtac SAI125 Standard Air Cylinder SAI125X350S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X350S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X350S
The AirTAC SAI125X350-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 8590 N at 0.7 MPa, making it ideal for high-load actuation. The 350 mm stroke provides ample extension for clamping, lifting, and pressing tasks.
This variant includes a standard magnet for position sensing and is fully compatible with CMSE and DMSE series switches. The barrel features integrated sensor grooves on both sides for flexible mounting. It uses a standard PT tapered port thread and a carbon steel piston rod for maximum structural durability in demanding industrial environments.
Airtac SAI125 Standard Air Cylinder SAI125X350S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X350S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125X350S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAI125X350S Is Used
Heavy-Duty Stamping
Provides the 6136 N force at 0.5 MPa required to form and stamp thick metal components in automated fabrication lines.
Automotive Assembly
Utilizes the 350 mm stroke to push heavy chassis sub-assemblies into alignment fixtures before robotic welding.
Pallet Positioning
Shifts loaded pallets laterally across conveyor transfer stations with reliable high-thrust actuation.
Is the Airtac SAI125 Standard Air Cylinder SAI125X350S the Right Cylinder?
Selecting this 125 mm bore makes sense when the 100 mm class (3927 N at 0.5 MPa) lacks the necessary thrust for your application, but you want to avoid stepping up to the massive 160 mm bore. At 350 mm of stroke, the unsupported rod is highly susceptible to bending under side loads. To prevent premature seal wear and rod-bearing failure, implement an external guide rail or use a dedicated guided cylinder to absorb lateral forces.
Because this is a double-acting pneumatic cylinder, it relies on continuous air pressure to hold its position. If air is exhausted or pressure drops, the piston will drift. The adjustable air cushions at both ends only decelerate the piston near the stroke limits; they do not lock the load. For dead-stop holding, consider the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variants. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders, offering a drop-in replacement using standard LB, FA, or TC mounting accessories.
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 SAI125X350S FAQ
At 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.7 MPa, the push force rises to 8590 N.
No, the standard SAI cylinder is double-acting and will drift if air pressure is lost. The adjustable air cushions only slow the piston at the end of the stroke; they do not lock the load. For position holding, use the SAIL or BSAI variants.
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