Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75S 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 SAIJ40BX240-75S
The AirTAC SAIJ40X240-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 165 to 240 mm. Delivering 628 N of push force at 0.5 MPa, it features a SUS304 stainless steel rod and a PT tapered port thread for robust pneumatic integration.
This adjustable-stroke design allows precise end-position tuning during commissioning without swapping hardware. The extruded aluminum barrel includes sensor grooves on both sides for CMSE and DMSE switches, while the rear stopper acts purely as a travel limit and not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75S |
|---|---|
| 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 SAIJ40BX240-75S
| 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 SAIJ40BX240-75S Is Used
Product Changeover
Dial in the 165-240 mm travel window rapidly during format size changes without bolting on external stops.
End-Position Tuning
Fine-tune the retract end position at machine commissioning to dial out mechanical clearances perfectly.
Variable End Stops
Adapt the stroke on the fly for sorting diverter arms handling varying package lengths on a conveyor.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-75S the Right Cylinder?
Choose this 40 mm bore when you need more thrust than a 32 mm bore (402 N at 0.5 MPa) but want a lighter footprint than a 50 mm bore (982 N). The generous 75 mm adjustment window is perfect for product-size changeovers on a line, replacing the need for fixed SAI cylinders when exact end stops fluctuate. Because the stroke is 240 mm, ensure external guiding to prevent excessive side loading on the rod.
For a true ISO 15552 replacement match, verify the 40 mm bore, 240 mm stroke, PT port, and the -S magnet option. If the application requires holding a load without live air pressure, select a SAIL or BSAI cylinder instead, as this rear adjuster only sets the travel end.
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 SAIJ40BX240-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N push force at 0.9 MPa.
The rear adjuster screw lets you shorten the effective travel from the 240 mm nominal stroke down to 165 mm. This stopper only sets the end position and does not lock the load without live air.
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