Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50S 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 SAIJ125AX325-50S
The AirTAC SAIJ125X325-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 325 mm stroke that can be dialed back by up to 50 mm, giving you a precise 275-325 mm usable travel window for fine-tuning end positions during commissioning. It delivers substantial thrust, offering 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
This unit includes a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and features a built-in magnet (-S) for position sensing. It works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches mounted in the dual-sided sensor grooves. The adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50S |
|---|---|
| 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 SAIJ125AX325-50S
| 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 SAIJ125AX325-50S Is Used
Product Changeovers
Dial in the 275-325 mm travel window during line changeovers to accommodate different package sizes without replacing the actuator.
Heavy Pressing
Leverage the 11045 N push force at 0.9 MPa for robust pressing and forming operations requiring exact end-position limits.
Machine Setup
Fine-tune the retract end-stop during initial commissioning to perfect machine timing without adding external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy force—delivering 6136 N pull at 0.5 MPa—over a specific travel range that needs on-machine fine-tuning. If you need less force, stepping down to an 80 mm bore yields 2268 N pull at 0.5 MPa. The adjustable rear screw is ideal for product changeovers, allowing you to shorten the stroke without swapping cylinders or adding external stops. For load-holding without continuous air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is only a travel stop.
This cylinder is dimensionally interchangeable per ISO 15552 mounting interfaces. To match this exact configuration, specify: 125 mm bore, 325 mm stroke, 50 mm adjustment, PT tapered port thread, SUS420J2 rod, and a magnet for CMSE/DMSE sensors. Because the 325 mm stroke is relatively long, ensure an external guide is used to prevent excessive side-loading on the 32 mm rod and M27x2 thread.
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 SAIJ125AX325-50S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.9 MPa, the push force increases to 11045 N.
A rear screw stopper lets you trim the 325 mm nominal stroke back by up to 50 mm, creating a 275-325 mm adjustable travel window. It functions as a stop, not a lock.
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