Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30
The AirTAC SAIJ40X240-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 210 to 240 mm, allowing you to dial back the nominal 240 mm stroke by up to 30 mm during commissioning without adding external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the rod end features an M12x1.25 thread for straightforward load coupling.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40BX240-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40BX240-30 Is Used
Machine Changeover
Quickly adapt the cylinder's end-stop from 240 mm down to 210 mm when switching a packaging line to a smaller product format.
End-Position Tuning
Fine-tune the retract stroke during commissioning to achieve exact positioning without fabricating custom external spacers.
Assembly Pressing
Apply up to 1130 N of push force at 0.9 MPa for light-duty pressing tasks while retaining the flexibility to adjust the press depth.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30 the Right Cylinder?
Choose this adjustable model over a fixed-stroke SAI when a machine requires fine end-position tuning or frequent product changeovers. The rear adjuster acts solely as a mechanical stop to set the travel end; it does not hold the load without live air pressure. For true load-holding requirements, consider the SAIL (air-released lock) or BSAI (clamp-lock) series.
When configuring your ISO 15552 replacement, match the 40 mm bore, 240 mm stroke, 30 mm adjustment range, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 240 mm stroke is substantial for a 40 mm bore, ensure adequate external guiding to prevent excessive side loading on the 16 mm rod.
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 SAIJ40BX240-30 FAQ
At 0.5 MPa, the 40 mm bore provides 628 N of push force and 528 N of pull force. At 0.9 MPa, the push force increases to 1130 N.
A rear adjuster screw mechanically stops the piston short of its full travel, creating a 210 to 240 mm usable stroke window. It functions as a travel stop and does not lock the load without continuous air pressure.
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