Airtac SAI125 Standard Air Cylinder SAI125X250
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X250 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X250
The AirTAC SAI125X250 is a double-acting ISO 15552 profile cylinder built for heavy-duty automation. It delivers a substantial push force of 6136 N and pull force of 5734 N at 0.5 MPa. The 250 mm stroke is well-suited for moving large masses or actuating heavy platens across automated machinery.
This genuine AirTac unit features a standard carbon steel piston rod for high tensile strength. Because no magnet is specified, it uses a plain piston without sensor tracks. For high-temperature environments up to +70 C, you can specify Viton (H) seals instead of the standard TPU elastomers.
Airtac SAI125 Standard Air Cylinder SAI125X250 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X250 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAI125X250
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAI125X250 Is Used
Heavy Stamping Presses
Provides the high thrust needed to actuate large stamping or forming presses in metal fabrication lines.
Pallet Diverters
Moves heavy loaded pallets on conveyor lines by extending a robust 250 mm stroke to push or divert materials.
Large Clamp Fixtures
Secures large automotive or aerospace components during machining operations requiring immense holding force.
Is the Airtac SAI125 Standard Air Cylinder SAI125X250 the Right Cylinder?
Select this 125 mm bore when 100 mm (3927 N at 0.5 MPa) lacks the thrust for your load, but a 160 mm bore (10053 N) would be excessive overkill. The integrated adjustable air cushions at both ends decelerate the heavy piston smoothly, but do not lock the load. If your application must hold a vertical position without constant air pressure, use the SAIL (air-released lock) variant or an external rod lock.
This model uses a PT tapered G1/2 port thread. As an ISO 15552 profile cylinder, it mounts dimensionally interchangeably with other ISO 15552 cylinders using standard FA flanges or TC trunnion brackets.
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 SAI125X250 FAQ
At a 0.5 MPa operating pressure, 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 SAI125X250 is a true ISO 15552 profile cylinder, making its mounting interface dimensionally interchangeable with other ISO 15552 cylinders. You can drop it into existing standard FA flange or TC trunnion mounts.
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