Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75
The AirTAC SAIJ125X145-75 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a nominal 145 mm stroke that can be fine-tuned backward by up to 75 mm, creating a precise 70 to 145 mm usable travel window. This allows exact end-position calibration during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the rod is constructed from SUS420J2 stainless steel for enhanced corrosion resistance.
Delivering 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa, this 125 mm bore actuator is built for heavy-duty positioning. It uses PT tapered port threads (G1/2) and operates at speeds between 30 and 500 mm/s. The rear adjuster acts solely as a travel stop to decelerate the load, not as a locking mechanism, meaning live air pressure is required to hold position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125AX145-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125AX145-75 Is Used
Heavy-Duty Press Tuning
Dial in the exact 70-145 mm travel window during machine commissioning to set precise pressing forces without swapping out the entire actuator.
Product Changeover
Quickly adjust the rear stopper on the fly to accommodate different product sizes on the same conveyor line, minimizing downtime between runs.
Variable End-Stop Positioning
Use the 75 mm adjustment range to fine-tune the retract position of heavy jigs, relying on the 6136 N thrust at 0.5 MPa for robust actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-75 the Right Cylinder?
Select this 125 mm bore model when your application requires high thrust combined with variable end-stop positioning. If you need slightly less force, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. The adjustable 75 mm trim window is ideal for product changeovers on a line, offering flexibility that a fixed-stroke SAI cylinder cannot provide. For load-holding without continuous air pressure, consider an external rod lock or pilot-operated check valve, as the SAIJ rear adjuster only sets the travel end.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 145 mm stroke, PT port threads, and the 75 mm adjustment range. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because this cylinder lacks a built-in magnet, it does not support AirTAC CMSE or DMSE sensors without modification.
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 SAIJ125AX145-75 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 75 mm from the nominal 145 mm, providing a usable travel window of 70 to 145 mm. This stopper decelerates the travel end but does not lock the load without live air pressure.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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