Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50
The AirTAC SAIJ40X125-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 125 mm stroke that can be dialed back by up to 50 mm, creating a usable travel window of 75 to 125 mm. Delivering 879 N of push force at 0.7 MPa, it is engineered for applications requiring exact end-position calibration during commissioning.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to fine-tune the retract distance without needing external stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX125-50 Is Used
Product Changeover
Dial the stroke back from 125 mm to 75 mm during line changeovers to accommodate different package sizes without replacing the actuator.
End-Position Calibration
Fine-tune the retract end-position during machine commissioning to achieve exact alignment without adding external mechanical stops.
Variable End Stops
Set precise, repeatable retract positions for multi-stage assembly processes where the effective stroke needs periodic adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-50 the Right Cylinder?
Select this 40 mm bore when your application requires 879 N of thrust at 0.7 MPa and variable end-stop positioning. If you need less force, stepping down to a 32 mm bore yields 563 N at the same pressure. The 50 mm adjustment range is ideal for product changeovers on a line, allowing you to shift the travel window from 75 to 125 mm without swapping the cylinder.
For a drop-in ISO 15552 replacement, match the 40 mm bore, 125 mm nominal stroke, 50 mm adjust code, PT port, and SUS304 (B) rod material. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. Since the rear adjuster is a travel stop and not a lock, the cylinder will not hold a load without live air; for dead-load holding, consider the SAIL or BSAI series instead.
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 SAIJ40 Adjustable Cylinder SAIJ40BX125-50 FAQ
At 0.7 MPa operating pressure, the 40 mm bore provides 879 N of push force and 738 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 128 kgf of push force.
The rear adjuster screw lets you mechanically shorten the effective stroke by up to 50 mm. This means the 125 mm nominal stroke can be fine-tuned down to a 75 mm travel window. The adjuster acts as a stop and does not lock the load without continuous air pressure.
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