Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75S 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 SAIJ125AX325-75S
The AirTAC SAIJ125X325-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. It features a built-in magnet for position sensing and a SUS420J2 stainless steel rod for enhanced corrosion resistance. With a nominal 325mm stroke, the external stopper lets you dial back the travel by up to 75mm, creating a precise 250-325mm usable window for fine-tuning end positions.
This adjustable travel range is ideal for product changeovers, allowing you to reposition the end stop without swapping the cylinder or adding external stops. The rear adjuster acts strictly as a travel stop, not a lock, and works alongside the 40mm variable air cushions at both ends to control deceleration. It includes dual-side sensor grooves compatible with CMSE reed and DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75S |
|---|---|
| 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 SAIJ125AX325-75S
| 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 SAIJ125AX325-75S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 250-325mm window during machine setup to accommodate different product lengths without mechanical rebuilds.
Heavy-Duty Product Changeover
Leverage the 6136N thrust at 0.5MPa to push heavy pallets or fixtures, quickly adjusting the 75mm travel range for new packaging formats.
Sensor-Verified Stroke Tuning
Use the integrated magnet with DMSE electronic sensors to confirm the adjusted end position, ensuring repeatable performance across the 325mm travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5MPa) lacks the thrust for heavy moving loads, but a 160mm bore is physically oversized. The 75mm adjustment window is perfect for variable end-stop setups and machine commissioning. For applications requiring the load to be held without live air pressure, note that this adjuster is only a stop; you would need an external rod lock or a related SAIL pneumatic lock cylinder.
As a direct ISO 15552 replacement, match the 125mm bore, 325mm stroke, PT tapered ports, and -S magnet requirement. Because the stroke is 325mm, ensure adequate external guiding to prevent excessive side-loading on the SUS420J2 rod. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and 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 SAIJ125AX325-75S FAQ
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the effective travel from the nominal 325mm down to 250mm. It acts as a mechanical stop to set the end position and does not lock the load without air pressure.
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