Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-100 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 SAIJ125 Adjustable Cylinder SAIJ125X325-100
The AirTAC SAIJ125X325-100 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning. By turning the external stopper screw, you can trim the effective travel anywhere within a 225 to 325 mm window, providing exact end-position tuning without swapping hardware.
This pneumatic actuator features a standard carbon steel piston rod with an M27x2 thread and uses PT tapered port threads with a G1/2 connection. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Because the 325 mm stroke is substantial, an external guide is recommended to manage side loads and prevent rod deflection during operation.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-100 |
|---|---|
| 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 SAIJ125 Adjustable Cylinder SAIJ125X325-100
| 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 SAIJ125 Adjustable Cylinder SAIJ125X325-100 Is Used
Variable End Stops
Dial in the precise 225 to 325 mm travel distance required for different product lengths during machine setup.
Heavy Product Changeover
Leverage the 6136N push force to move heavy pallets while quickly adjusting the rear stopper for new dimensions.
Long-Stroke Positioning
Use the 325 mm travel to push heavy assemblies into test fixtures, relying on the adjuster to prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-100 the Right Cylinder?
Choose this 125 mm bore actuator when a machine requires high thrust combined with variable end stops for product changeovers. If your application needs less force, stepping down to an 80 mm bore yields 2513N of push force at 0.5 MPa, while moving up to a 160 mm bore provides 10053N. The 100 mm adjustment range is ideal for lines running mixed product sizes, allowing operators to dial in the exact stroke on the fly instead of adding external stops or reverting to a fixed-stroke SAI cylinder.
When integrating this model, remember the rear adjuster functions strictly as a travel stop, not a locking device. It cannot hold a load without continuous air pressure. For dead-load holding, consider an AirTAC SAIL pneumatic lock or a BSAI clamp-lock cylinder. This SKU supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting the FB, CA, CB, and CR brackets found on some other series.
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 SAIJ125X325-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can output up to 1251 kgf.
The rear adjuster acts as an external stopper screw, allowing you to shorten the nominal 325 mm stroke by up to 100 mm. This creates a usable travel window of 225 to 325 mm for fine-tuning the retract end position without changing the cylinder.
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