Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S
The AirTAC SAIJ125X140-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 8590N of push force at 0.7 MPa. Its integrated -S magnet pairs directly with CMSE reed and DMSE electronic solid-state sensors housed in the dual-side extruded aluminum barrel grooves for precise end-position detection. This model uses a carbon steel rod and PT tapered port threads.
Featuring a 140mm nominal stroke, the external rear adjusting screw provides a 75mm trim range, creating a flexible 65-140mm usable travel window. This built-in adjuster acts purely as a mechanical stop to set the retract end-position and relies on the variable air cushions for deceleration; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-75S Is Used
Product Changeover
Dial in the 65-140mm travel window during format size changes on packaging lines without physically swapping out the actuator.
End-Stop Tuning
Fine-tune the retract position at machine commissioning to perfect a pressing operation, using the rear stop instead of external shims.
Heavy Material Handling
Leverage the 8590N push force at 0.7 MPa to push heavy pallets or workpieces, adjusting the stroke length to accommodate varying load dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75S the Right Cylinder?
Select this 125mm bore when an application requires heavy thrust—such as the 6136N push force at 0.5 MPa—that exceeds the 3927N at 0.5 MPa provided by the 100mm bore. The 75mm adjustment range is ideal for production lines running multiple product sizes, allowing operators to fine-tune the retract end-stop during changeover without swapping the cylinder or adding external stops. If fixed end-positions are sufficient, a standard SAI cylinder offers a simpler setup.
To match this ISO 15552 footprint for a direct replacement, verify the 140mm stroke, 75mm adjustment amount, PT G1/2 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 32mm rod and M27x2 rod thread handle substantial loads, long unsupported strokes still require an external guide to prevent side-loading damage.
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 SAIJ125X140-75S FAQ
The 140mm nominal stroke can be mechanically shortened by up to 75mm via a rear adjusting screw, creating a usable travel window of 65-140mm. This stopper sets the retract end-position but does not lock the load without live air pressure.
At 0.7 MPa operating pressure, it provides 8590N of push force and 7588N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
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