Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50 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 SAIJ125AX290-50
The AirTAC SAIJ125X290-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 240 to 290 mm. Built with a 125 mm bore, it generates 6133 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning. This unit utilizes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and operates at speeds between 30 and 500 mm/s.
The integrated rear stopper screw allows technicians to fine-tune the retract end position during commissioning without adding external stops. The adjuster acts purely as a travel stop and does not hold the load without live air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on some other series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50 |
|---|---|
| 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 SAIJ125AX290-50
| 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 SAIJ125AX290-50 Is Used
Variable End-Stop Tuning
Dial in the exact retract position from 240 to 290 mm during machine setup to accommodate different workpiece lengths without swapping cylinders.
Product Changeover
Quickly adjust the stroke end on packaging lines to handle varying box sizes while maintaining the high 6133 N thrust needed for heavy loads.
Heavy-Duty Positioning
Leverage the 125 mm bore force and SUS420J2 stainless steel rod to move heavy jigs securely into their final retracted position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50 the Right Cylinder?
Choose this 125 mm bore cylinder when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a larger 160 mm bore is physically oversized. The 50 mm adjustment range is ideal for machinery requiring variable end-stops during product changeovers. Because the nominal stroke is 290 mm, which exceeds the 300 mm threshold, an external guide is recommended to prevent excessive side-loading on the piston rod.
For load-holding applications without continuous air pressure, this plain SAIJ model is insufficient since the rear adjuster is not a lock. Consider the SAIL series with an air-released lock or the BSAI clamp-lock cylinder instead. This SKU is dimensionally interchangeable per ISO 15552 with a PT tapered port thread and no integrated magnet.
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 SAIJ125AX290-50 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6133 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw lets you trim the effective stroke back by up to 50 mm, creating a usable travel window of 240 to 290 mm. It functions as a mechanical stop and does not lock the load without live air pressure.
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