Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30S 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 SAIJ40BX240-30S
The AirTAC SAIJ40X240-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 240 mm stroke that can be fine-tuned backward by up to 30 mm, creating a precise 210-240 mm usable travel window for exact end-position calibration. Delivering 628 N of push force at 0.5 MPa, this 40 mm bore unit handles moderate actuation tasks with ease.
This configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet for position sensing. You can mount CMSE reed or DMSE electronic switches directly into the extruded aluminum barrel's dual sensor grooves. The rear adjuster acts purely as a mechanical stop to set the retraction end, meaning it decelerates travel but does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30S |
|---|---|
| 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 SAIJ40BX240-30S
| 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 SAIJ40BX240-30S Is Used
Machine Changeover
Dial in the 210-240 mm travel window during product size transitions to set new retraction endpoints without changing the cylinder.
End-Position Tuning
Fine-tune the final retract position at commissioning using the rear stopper to perfect tooling alignment.
Variable Stops
Adjust the stroke on the fly for sorting or diverting tasks on a line that handles multiple package sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-30S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end-stops or product changeover flexibility without physically swapping out cylinders. If your application demands less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; conversely, a 50 mm bore provides 982 N for heavier loads. Because the total stroke is 240 mm, ensure external guiding is utilized if the load is unsupported to prevent excessive side-loading on the rod.
To match this exact ISO 15552 interchangeable footprint for a direct replacement, specify a 40 mm bore, 240 mm stroke, 30 mm adjustment range, PT tapered port threads, and the -S magnet option. Remember that for load-holding requirements without constant air pressure, you must look toward a SAIL pneumatic lock cylinder, a BSAI clamp-lock model, or an external rod lock, as the SAIJ adjuster is strictly a travel stop. The compatible mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX240-30S FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.7 MPa.
The rear adjusting screw acts as a mechanical stop that lets you trim the effective stroke back by up to 30 mm from the 240 mm nominal length, providing a 210-240 mm travel window. It sets the end position but does not hold the load without live air pressure.
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