Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S
The AirTAC SAIJ40X290-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 260-290 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it is equipped with a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. The integrated magnet supports position sensing.
This adjustable-stroke design allows you to fine-tune the retract end position during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear screw acts purely as a travel stop, meaning it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 290 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 SAIJ40BX290-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×290 | 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 SAIJ40BX290-30S Is Used
Product Changeovers
Dial in the 260-290 mm travel window during format changes without swapping out the entire cylinder or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke at commissioning to achieve precise seating of parts, absorbing mechanical tolerances in the fixture.
Variable Stops
Provide an adjustable physical end-stop for diverter arms or pushers on a conveyor line where product sizes frequently vary.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30S the Right Cylinder?
Choose this 40 mm bore when you need more thrust than a 32 mm bore provides (402 N push at 0.5 MPa) but want a smaller footprint than a 50 mm bore (982 N push at 0.5 MPa). The adjustable 260-290 mm window is ideal for product changeovers on a line where exact end positions vary slightly. Because the stroke is 290 mm, ensure adequate external guidance to prevent excessive side loading on the rod.
For a drop-in ISO 15552 replacement, match the 40 mm bore, 290 mm nominal stroke, 30 mm adjustment range, PT ports, and the -S magnet. If your application requires the cylinder to hold its position without continuous air pressure, the rear stopper here will not act as a lock; consider an AirTAC SAIL or BSAI cylinder 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 SAIJ40BX290-30S FAQ
At 0.5 MPa operating pressure, 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 lets you trim the effective stroke back by up to 30 mm, creating a 260-290 mm usable travel window. It functions as a mechanical stop and does not lock the load without live air.
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