Airtac SAI125 Standard Air Cylinder SAI125X325S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X325S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X325S
The AirTAC SAI125X325-S is a double-acting ISO 15552 profile cylinder offering a substantial 6136 N push force at 0.5 MPa. Its 325 mm stroke handles substantial linear routing tasks. The extruded aluminum barrel design omits tie rods, providing a clean exterior that matches standardized ISO 15552 mounting dimensions for straightforward machine integration.
This unit includes an integrated magnet for position sensing, supporting CMSE or DMSE reed switches seated within the dual sensor grooves on the barrel. The standard carbon steel piston rod provides durable service, while the adjustable air cushions at both ends manage kinetic energy. For high-temperature environments up to 70 C, Viton (H) seals are available to replace the standard TPU polyurethane components.
Airtac SAI125 Standard Air Cylinder SAI125X325S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X325S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAI125X325S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAI125X325S Is Used
Heavy Package Diverting
Drives robust routing arms on high-capacity conveyor lines to shift heavy pallets or bulk containers laterally across transfer zones.
Press Ejection
Provides the high output force needed to eject dense molded components or stamped metal blanks from heavy-duty industrial presses.
Lift Gate Actuation
Raises and lowers substantial material handling gates on assembly lines, using the 325 mm stroke to achieve the required vertical clearance.
Is the Airtac SAI125 Standard Air Cylinder SAI125X325S the Right Cylinder?
With a 6136 N thrust at 0.5 MPa, this 125 mm bore suits heavy material handling. If your application requires less force, stepping down to the 100 mm bore yields 3927 N at 0.5 MPa, whereas the larger 160 mm bore provides 10053 N for heavier payloads. The 325 mm stroke is a standard configuration, falling well within the 1500 mm maximum limit for this bore size.
Because the stroke extends beyond 300 mm, the extended rod is vulnerable to bending under side loads. Utilizing an external guide rail or a dedicated guided cylinder prevents rod-bearing wear and ensures smooth operation. Note that this cylinder relies on continuous air pressure to hold its load; the adjustable air cushion only decelerates the piston at stroke end and will not function as a fail-safe brake. For secure load holding without pressure, consider the SAIL locking variant or an external rod lock.
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 SAI125X325S FAQ
At 0.5 MPa, it provides 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.
Yes, the SAI125X325-S is dimensionally interchangeable per ISO 15552. It serves as a drop-in replacement for other ISO 15552 profile cylinders, matching the standardized mounting interface and G1/2 PT port.
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