Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40
The AirTAC SAIJ125X225-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 8590N of push force at 0.7 MPa. Its 225mm nominal stroke can be dialed back by up to 40mm, creating a precise 185-225mm usable travel window for fine-tuning end positions during commissioning. This eliminates the need to swap cylinders or bolt on external stops when aligning machinery.
Built with a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance, this large-bore actuator runs at 30-500mm/s and uses PT tapered ports. It retains the standard extruded aluminum barrel with dual sensor grooves, though it omits the FB, CA, CB, and CR mounting options, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125AX225-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SAIJ125AX225-40 Is Used
Product Changeover
Dial in the 185-225mm travel window during format changes on packaging lines, using the rear screw to set new end positions without changing the cylinder.
Heavy Pressing
Leverage the 8590N push force at 0.7MPa for heavy-duty pressing or holding tasks where exact final position tuning is critical for assembly quality.
Machine Setup
Fine-tune the retract end-position at machine commissioning to perfectly align tooling, avoiding the need to machine custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40 the Right Cylinder?
Select this 125mm bore when a 63mm cylinder (providing 2182N push at 0.5MPa) is insufficient, but an 80mm bore (3518N at 0.7MPa) cannot meet the required 8590N thrust at 0.7MPa. The adjustable 185-225mm window is ideal for product-size changeovers on a line, allowing operators to set variable end-stops without replacing the actuator. For load-holding without live air pressure, note that this cylinder's rear adjuster acts only as a travel stop and not a lock; you should instead specify an AirTAC SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 125mm bore, 225mm stroke, 40mm adjustment range, PT port thread, and required mounting hardware. Because the stroke exceeds 300mm on larger variants, external guidance is recommended to prevent side-loading, though this 225mm model utilizes a robust 32mm rod and M27x2 thread to handle standard operational stresses.
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 SAIJ125AX225-40 FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it achieves a push force of 11045N.
The rear adjuster acts as a mechanical stop that shortens the retract stroke by up to 40mm, providing a usable travel window of 185-225mm from the 225mm nominal stroke. It only sets the travel end and does not lock the load without live air pressure.
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