Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75
The AirTAC SAIJ125X240-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 165 to 240 mm, allowing you to dial back the nominal stroke by up to 75 mm during commissioning. This bore delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
Built with a SUS420J2 stainless steel rod, it handles demanding environments while utilizing PT tapered port threads for a tight pneumatic seal. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts strictly as a travel stop to fine-tune end positions without external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125AX240-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125AX240-75 Is Used
Variable End-Stop Setup
Dial in the exact retract position within the 165-240 mm window during machine commissioning without adding external mechanical stops.
Product Size Changeover
Quickly adapt the stroke length on automated lines when switching between different product formats or packaging dimensions.
Heavy Positioning
Leverage the 6136 N push force to move heavy pallets or tooling bases into precise final alignment before locking.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75 the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N. The 75 mm adjustment window is highly useful for machines processing varying product sizes, letting operators set new end stops on the fly instead of physically swapping cylinders. For holding loads without live air pressure, this cylinder is insufficient; you must explore an external rod lock or AirTAC SAIL and BSAI series. To match this ISO 15552 replacement, specify 125 mm bore, 240 mm stroke, 75 mm adjust, PT G1/2 port, and your required mounting.
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 SAIJ125AX240-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push at 0.9 MPa.
The rear adjuster screw lets you shorten the effective travel from the 240 mm nominal stroke down to 165 mm. This stopper fine-tunes the end position but does not lock the load without live air.
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