Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-30 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 SAIJ125X225-30
The AirTAC SAIJ125X225-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external stopper screw, you can trim the nominal 225 mm travel back by up to 30 mm, creating a precise 195-225 mm usable window. This allows exact end-position tuning at commissioning without swapping the cylinder or adding external stops.
It features a 32 mm carbon steel rod and an M27x2 thread, providing a rigid interface that handles substantial side loads, though long unsupported strokes still require an external guide. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-30 |
|---|---|
| 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 SAIJ125X225-30
| 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 SAIJ125X225-30 Is Used
Machine Changeover
Dial in the 195-225 mm travel window during product size changes to set new reject or push positions without machining new hard stops.
End-Stop Tuning
Fine-tune the final retract position during commissioning to hit exact datum lines on large assembly tooling.
Variable Positioning
Adjust the stroke rearward by up to 30 mm to accommodate varying material widths on heavy-duty handling lines.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-30 the Right Cylinder?
Choose this 125 mm bore when you need more force than the 100 mm class provides (3927N push at 0.5 MPa) but less than the 160 mm class (10053N). The adjustable stroke is ideal for product changeovers or machine setups where the exact end-stop needs live tweaking rather than a fixed SAI cylinder. The PT tapered port and G1/2 thread size match standard pneumatic manifolds.
Because the rear adjuster acts only as a travel stop and the air cushions handle deceleration, neither holds the load without live air. For true position holding without continuous pressure, consider the SAIL air-released lock, the BSAI clamp-lock, or an external pilot-operated check valve. As a true profile cylinder, it is dimensionally interchangeable per ISO 15552.
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 SAIJ125X225-30 FAQ
At 0.5 MPa it provides 6136N push and 5734N pull force. At 0.7 MPa the push force increases to 8590N, with a maximum rated force of 1251 kgf at 1.0 MPa.
The rear stopper screw lets you shorten the 225 mm nominal stroke by up to 30 mm, yielding a usable 195-225 mm travel window. It acts as a mechanical stop and does not lock the load without live air pressure.
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