Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10 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 SAIJ125 Adjustable Cylinder SAIJ125X250-10
The AirTAC SAIJ125X250-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust performance for heavy-duty pneumatic tasks. It generates 6136N of push force and 5734N of pull force at 0.5 MPa. By integrating a 10mm adjustment mechanism, this unit provides a usable travel window between 240mm and 250mm, allowing technicians to dial in the exact retract position without swapping out the entire actuator.
Built with a carbon steel piston rod and a PT tapered port thread, this extruded aluminum barrel design includes variable air cushions at both ends to manage kinetic energy. The rear adjuster functions strictly as a mechanical stop to fine-tune the end-of-travel position; it is not a locking device and cannot hold a load without continuous live air pressure. For load-holding requirements, consider an external rod lock or the related SAIL series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10 |
|---|---|
| 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 SAIJ125 Adjustable Cylinder SAIJ125X250-10
| 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 SAIJ125 Adjustable Cylinder SAIJ125X250-10 Is Used
Heavy Press Tuning
Dial in the exact 240-250mm retract position on heavy pressing machinery to compensate for mechanical wear without adding external stopper blocks.
Machine Commissioning
Fine-tune the end-stop during initial machine setup, ensuring perfectly aligned heavy-load transfers before finalizing the pneumatic circuit.
Assembly Line Calibration
Achieve precise end-of-stroke positioning on large assembly fixtures where a standard fixed-stroke cylinder lacks the necessary mechanical trim.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10 the Right Cylinder?
Selecting this 125mm bore actuator is ideal when an application demands high thrust combined with precise end-position tuning during commissioning or product changeover. If the 6136N push force at 0.5 MPa exceeds your operational needs, stepping down to a 100mm bore provides 3927N, significantly reducing air consumption. Conversely, if higher force is necessary, the 160mm bore offers 10053N. Because the nominal stroke is 250mm, the 10mm adjustment window is perfectly suited for minor mechanical tweaks rather than broad product size variations. To replace an existing ISO 15552 cylinder, verify the PT port threads, the carbon steel rod material, and the required mounting style from the available SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
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 SAIJ125 Adjustable Cylinder SAIJ125X250-10 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that shortens the effective stroke by up to 10mm, creating a usable travel window of 240-250mm. It allows for fine-tuning the retract position at commissioning but does not lock the load without live air pressure.
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