Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75 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 SAIJ125X225-75
The AirTAC SAIJ125X225-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 125mm bore, a carbon steel rod, and PT tapered ports. The integrated rear stopper allows you to trim the effective travel, creating a 150-225mm usable window for precise positioning without swapping hardware.
This adjustable-stroke design is ideal for product changeovers, letting you fine-tune the retract end position at commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and the variable air cushions decelerate the load smoothly. Remember that the rear adjuster functions strictly as a travel stop, not a lock; it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75 |
|---|---|
| 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 SAIJ125X225-75
| 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 SAIJ125X225-75 Is Used
Product Changeovers
Dial in the 150-225mm travel window during format size changes on packaging lines without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stroke at machine commissioning to achieve exact mechanical stops for heavy forming operations.
Variable End Stops
Adapt automated assembly stations to different part heights by adjusting the rear stopper screw up to 75mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-75 the Right Cylinder?
Choose this 125mm bore when an 80mm bore (providing 2513N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 75mm adjustment range is particularly useful for machines processing varying product sizes, allowing the end-stop to be dialed in on the fly instead of adding external stops or reverting to a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 125mm bore, 225mm stroke, 75mm adjustment, PT port thread, and mounting choice. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Because the stroke is 225mm, ensure external guides support the load to prevent excessive side-loading on the rod.
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 SAIJ125X225-75 FAQ
The rear adjuster acts as an external stopper that shortens the stroke by up to 75mm. This gives the 225mm nominal stroke a usable travel window of 150-225mm, which can be fine-tuned during commissioning without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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