Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30
The AirTAC SAIJ40X280-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel window down to 250-280mm during commissioning. It delivers a robust 879N push force at 0.7MPa, making it well-suited for precise positioning tasks. The piston rod is constructed from SUS304 stainless steel, providing excellent corrosion resistance for harsh environments.
Equipped with a PT tapered port thread and a 16mm diameter rod, this unit uses an M12x1.25 rod thread. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The rear stopper mechanism sets the end position but does not lock the load without live air pressure; for drop-prevention, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAIJ40BX280-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SAIJ40BX280-30 Is Used
Variable End-Stop Tuning
Dial in the exact 250-280mm travel distance during machine setup to accommodate varying product sizes without changing hardware.
Corrosive Positioning
Leverage the SUS304 stainless steel rod for precise actuation in washdown or chemically exposed manufacturing environments.
Changeover Adjustment
Quickly reposition the rear stopper for new batch dimensions on a conveyor line, minimizing downtime between production runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30 the Right Cylinder?
Choose this 40mm bore when your application requires more force than the 32mm version (which provides 563N push at 0.7MPa) but does not need the 1374N push of the 50mm class. The 30mm adjustment range is ideal for product changeovers on a line, allowing you to shift the end-stop without physically swapping the cylinder or adding external stops. It supports a standard speed range of 30-800mm/s.
For ISO 15552 replacement, match the 40mm bore, 280mm stroke, PT port thread, and SUS304 (B) rod material. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 280mm stroke is substantial, an external guide rail is recommended to prevent side-loading damage to the rod.
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 SAIJ40BX280-30 FAQ
At 0.7MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 528N of pull force. It can deliver up to 1130N push at 0.9MPa.
The rear adjuster screw mechanically limits the return stroke, creating a usable travel window between 250mm and 280mm. This stopper only sets the end position and does not hold the load without live air.
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