Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40 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 SAIJ40BX125-40
The AirTAC SAIJ40X125-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel end-point during commissioning. By dialing the integrated stopper screw, you achieve a usable stroke window of 85 to 125 mm without adding external stops. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits medium-duty applications.
This unit uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads (G1/4) for a tight seal. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE solid-state switches if a magnet is later required. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40 |
|---|---|
| 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 SAIJ40BX125-40
| 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 SAIJ40BX125-40 Is Used
Product Changeover Lines
Dial in the 85 to 125 mm travel window to accommodate different package sizes on the fly without physically swapping out the cylinder.
End-Position Tuning
Fine-tune the retract stroke during initial machine commissioning to perfect timing and positioning without external stopper blocks.
Medium-Duty Handling
Leverage the 628 N push force to push or lift workpieces through processing stations while adjusting travel for varied tooling depths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-40 the Right Cylinder?
Choose this 40 mm bore when 32 mm bore thrust (402 N push at 0.5 MPa) is insufficient, but a 50 mm bore (982 N push) would be overkill. An adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops for product changeovers or precise machine setup.
For any load-holding requirements without continuous air pressure, note that this adjuster is not a brake; you should look at the SAIL or BSAI series instead. To match this exact configuration, specify a 40 mm bore, 125 mm nominal stroke, 40 mm adjustment, PT port threads, SUS304 rod, and no magnet. Because the nominal stroke is under 300 mm, side-load concerns are minimal, but long unsupported loads still need an external guide.
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 SAIJ40BX125-40 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 125 mm nominal stroke down to a minimum of 85 mm. This creates an 85 to 125 mm adjustable window for precise end-position tuning without changing the cylinder.
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