Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75S 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 SAIJ125AX240-75S
The AirTAC SAIJ125X240-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By turning the rear stopper screw, you can trim the effective travel back by up to 75 mm, creating a precise 165-240 mm usable stroke window without swapping hardware. This makes it highly effective for production lines running multiple product sizes.
This unit features a SUS420J2 stainless steel rod for superior corrosion resistance and includes a magnet (-S) for position sensing. It operates at 30-500 mm/s and uses PT tapered ports sized G1/2. The extruded aluminum barrel retains sensor grooves on both sides, and the mounting interface is dimensionally interchangeable per ISO 15552.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75S |
|---|---|
| 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 SAIJ125AX240-75S
| 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 SAIJ125AX240-75S Is Used
Product Size Changeovers
Dial in the 165-240 mm travel window during format changeovers to accommodate different package lengths without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to achieve exact positioning, compensating for mechanical tolerances in the fixture.
Heavy-Duty Forming
Leverage the 6136N push force at 0.5 MPa for pressing or forming applications where the exact end-of-stroke contact point needs on-site adjustment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-75S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but stepping up to a 160 mm bore (10053N) would be excessive. The 75 mm adjustment range is particularly valuable for machine setups requiring frequent changeovers, allowing you to fine-tune the retract end-position on the fly instead of installing fixed external stops.
Because the nominal stroke is 240 mm, side-load risks are moderate but manageable; ensure proper external guiding to protect the M27x2 rod thread. For load-holding without continuous air pressure, note that the rear adjuster acts only as a travel stop, not a brake—consider an AirTAC SAIL or BSAI cylinder for positive locking. When replacing an ISO 15552 cylinder, match the 125 mm bore, 240 mm stroke, 75 mm adjustment, G1/2 PT ports, and the -S magnet requirement.
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 SAIJ125AX240-75S FAQ
It features a rear stopper screw that allows you to shorten the nominal 240 mm stroke by up to 75 mm. This provides an adjustable travel window of 165 to 240 mm, letting you set the exact retract end-position at commissioning without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
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