Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40S 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 SAIJ40BX290-40S
The AirTAC SAIJ40X290-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end position. It provides a usable travel window of 250 to 290 mm, enabling precise end-position tuning at commissioning without adding external stops. It delivers 628N of push force and 528N of pull force at 0.5 MPa.
This variant includes a SUS304 stainless steel rod (option B) for superior corrosion resistance and features a built-in magnet for DMSE electronic and CMSE reed sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the M12x1.25 rod thread handles moderate side loads effectively.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40S |
|---|---|
| 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 SAIJ40BX290-40S
| 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 SAIJ40BX290-40S Is Used
Machine Changeover
Dial in the exact 250 to 290 mm retract position during product size changes without swapping out the entire cylinder.
End-Stop Calibration
Fine-tune the final end-of-stroke position during commissioning to perfect operational timing and avoid mechanical crashes.
Variable Diverter
Adjust the travel distance of a sorting arm on the fly to accommodate different package dimensions on the line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end-stops or product changeover flexibility, rather than relying on a fixed-stroke SAI cylinder. If your application requires higher force, stepping up to a 50mm bore yields 982N of push force at 0.5 MPa. Because the total stroke is 290mm, ensure an external guide supports any long unsupported loads to prevent rod bending.
The rear adjuster acts purely as a mechanical stop for deceleration and does not hold the load without live air pressure. For true load-holding, consider an external rod lock or the SAIL series. For an exact ISO 15552 replacement match, verify the 40mm bore, 290mm stroke, 40mm adjustment, PT tapered ports, SUS304 rod, and the -S magnet option.
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 SAIJ40BX290-40S FAQ
The rear adjuster is a mechanical stopper that lets you shorten the nominal 290 mm stroke by up to 40 mm, providing an effective travel window of 250 to 290 mm. It only sets the travel end and does not lock or hold the load without live air pressure.
At 0.5 MPa, it provides 628N of push force and 528N of pull force. The operating speed range for this 40 mm bore cylinder is 30 to 800 mm/s, and it includes a magnet for CMSE and DMSE sensors.
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