Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40
The AirTAC SAIJ40X425-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 879N of push force at 0.7MPa and provides a usable travel window of 385 to 425mm, letting you trim the retract position by up to 40mm during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and because this configuration uses a SUS304 stainless steel rod, it is well-suited for environments where corrosion resistance is a priority.
This model uses a PT tapered port thread and omits the FB, CA, CB, and CR mounting options found on some standard cylinders, supporting Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not function as a lock, meaning the cylinder cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-40 Is Used
Changeover Calibration
Dial in the exact 385 to 425mm end-stop during product size changeovers on a packaging line without swapping out the entire actuator.
Machining Fixtures
Fine-tune the clamping reach on a machining fixture where the raw material thickness varies slightly, using the rear screw to set the precise retract distance.
Sorting Diverter
Adjust the retraction point of a conveyor sorting diverter on the fly to accommodate different package widths without repositioning the cylinder mounts.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-40 the Right Cylinder?
Choose this 40mm bore when an application requires moderate force, such as 628N push at 0.5MPa, but stepping up to a 50mm bore would be overkill with its 982N at 0.5MPa. The adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning without adding external stops. To replace an ISO 15552 cylinder, match the 425mm stroke, 40mm adjustment, PT port, and required mounting hardware.
Because the 425mm stroke is relatively long, the 16mm diameter rod and M12x1.25 rod thread will experience more leverage stress under side-loading; an external guide rail is recommended to prevent premature seal wear. For applications requiring true load-holding without continuous air pressure, a plain SAIJ is insufficient, and you should look toward the SAIL or BSAI locking cylinder variants.
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 SAIJ40BX425-40 FAQ
At an operating pressure of 0.5MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7MPa, the push force increases to 879N.
The rear adjuster screw allows you to mechanically shorten the effective stroke from its nominal 425mm down to 385mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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