Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20
The AirTAC SAIJ40X750-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel into a 730-750 mm window. Delivering 628 N of push force at 0.5 MPa, it integrates a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread for a robust seal. The extruded aluminum barrel includes sensor grooves on both sides.
Because the 750 mm stroke is substantial for a 40 mm bore, the 16 mm rod and M12x1.25 thread must be guided externally to prevent binding. The rear adjuster acts purely as a travel stop for fine-tuning end positions during commissioning; it does not lock the load without live air pressure. For true fail-safe holding, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 750 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 SAIJ40BX750-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×750 | 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 SAIJ40BX750-20 Is Used
Product Changeover
Dial in the 730-750 mm stroke window on the fly to accommodate varying package sizes on a packaging line without replacing the actuator.
End-Stop Tuning
Fine-tune the exact retract position during machine commissioning using the rear adjuster, ensuring perfect alignment without adding external mechanical stops.
Material Handling
Use the 628 N push force to index pallets or product stops, relying on the external guide to support the long 750 mm stroke.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20 the Right Cylinder?
Choose this adjustable model over a fixed SAI cylinder when your machine requires variable end-stops or product changeover flexibility without swapping hardware. If your application needs less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa. If you require more thrust, a 50 mm bore provides 982 N.
This SKU omits the FB, CA, CB, and CR mounting accessories, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. Given the 750 mm length, always use an external guide rail to manage side loads and protect the rod seals. This cylinder is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX750-20 FAQ
The nominal stroke is 750 mm, but the rear adjuster allows you to shorten the effective travel by up to 20 mm, creating a usable 730-750 mm window for fine-tuning end positions.
No, the rear adjuster is a travel stop, not a lock. The cylinder cannot hold its position without live air. For load-holding without pressure, use a SAIL or BSAI cylinder, or an external rod lock.
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