Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20
The AirTAC SAIJ125X290-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N pull force at 0.5 MPa. By turning the external stopper screw, you can fine-tune the effective travel within a 270-290 mm window, eliminating the need to swap cylinders during product changeovers. The standard carbon steel rod and PT tapered port threads ensure durable, leak-free pneumatic connections in heavy-duty environments.
Because this is an adjustable-stroke variant, the mounting interface is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 footprints, intentionally omitting FB, CA, CB, and CR brackets. The extruded aluminum barrel features sensor grooves on both sides for straightforward position feedback, though this specific configuration omits the magnet required for AirTAC CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 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 SAIJ125X290-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | 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 SAIJ125X290-20 Is Used
Product Changeovers
Dial in the 270-290 mm travel window during line changeovers to accommodate varying package sizes without swapping out the entire actuator.
Clamping Force Setup
Fine-tune the end-of-stroke position during machine commissioning to achieve exact clamping contact on heavy workpieces before applying full 0.7 MPa operating pressure.
Variable End Stops
Adjust the rear stopper screw to set precise retraction limits for heavy-duty material ejection systems that require flexible positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-20 the Right Cylinder?
Select this 125 mm bore when your application requires high thrust combined with variable end-stop positioning, such as dialing in a precise clamping distance on the fly. If you need less force, stepping down to an 80 mm bore yields 2268N of pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425N. For fixed-travel tasks that never require commissioning adjustments, a standard SAI cylinder is a simpler choice. To replace this unit, match the 125 mm bore, 290 mm stroke, 20 mm adjustment, PT G1/2 port, and the required mounting bracket.
With a 290 mm stroke, the M27x2 piston rod is highly susceptible to side-loading forces; always guide the load externally to prevent premature seal wear. Furthermore, the rear adjuster acts strictly as a mechanical travel stop and does not hold the load without live air pressure. For fail-safe load holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder.
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 SAIJ125X290-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of pull force and 6136N of push force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 290 mm down to 270 mm. This provides a 20 mm adjustable window for fine-tuning end positions at commissioning without adding external stops.
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