Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30
The AirTAC SAIJ125X70-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125mm bore and a 70mm nominal stroke that can be dialed back by up to 30mm, providing a usable travel window of 40-70mm for precise end-position tuning. Operating at 0.5 MPa, it generates 6136N of push thrust and 5734N of pull thrust.
This unit incorporates a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and uses PT tapered G1/2 ports. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of position switches. You can fine-tune the retract end position during commissioning or product changeovers without swapping the cylinder or adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125AX70-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125AX70-30 Is Used
Machine Setup Changeover
Dial in the exact 40-70mm retract position during product size changeovers without physically swapping cylinders or adding external mechanical stops.
Variable End-Stop Tuning
Fine-tune the end of stroke during initial commissioning to absorb mechanical tolerances and achieve precise positioning of high-force tooling.
Heavy Assembly Pressing
Leverage the 6136N push force at 0.5 MPa to securely seat or press heavy components, adjusting the travel window to prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX70-30 the Right Cylinder?
Select this 125mm bore when your application requires high force, specifically 6136N of thrust at 0.5 MPa. If your setup only needs around 3927N, stepping down to a 100mm bore saves space, while moving up to a 160mm bore yields 10053N for heavier loads. The adjustable stroke is ideal when you need a variable end-stop to accommodate multiple product sizes on the same line.
As a true ISO 15552 cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders. Ensure your replacement matches the 125mm bore, 70mm stroke, 30mm adjustment, PT G1/2 port, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air. For load-holding without pressure, consider the SAIL or BSAI series.
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 SAIJ125AX70-30 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw allows you to shorten the 70mm nominal stroke by up to 30mm, creating a usable travel window of 40-70mm. The adjuster acts as a stop to tune the end position but does not lock the load without live air pressure.
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