Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40
The AirTAC SAIJ40X550-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 510-550 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it handles mid-range actuation tasks with precision. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This configuration utilizes a SUS304 stainless steel rod for superior corrosion resistance and ships with PT tapered port threads. The rear stopper screw allows you to fine-tune the retract end position during commissioning without adding external stops. Note that this adjuster acts only as a travel stop, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-40 Is Used
Product Changeover
Dial in the 510-550 mm travel window on packaging lines to accommodate different carton sizes without swapping hardware.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact positioning without external stopper blocks.
Variable End Stops
Adjust the stroke dynamically on sorting conveyors to push varying product lengths accurately into divert lanes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-40 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 402 N push at 0.5 MPa) lacks the necessary force, but a 63 mm bore (1559 N) would be excessive. The 40 mm adjustment code is ideal for applications requiring a variable end-stop or product changeover flexibility. Because the nominal stroke is 550 mm, an external guide is recommended to prevent excessive side-loading on the rod.
To match this ISO 15552 interchangeable cylinder, specify the 40 mm bore, 550 mm stroke, PT port thread, SUS304 rod, and your required mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). If position holding without live air pressure is required, select a 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 SAIJ40BX550-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to trim the effective stroke back by up to 40 mm from the 550 mm nominal length, creating a 510-550 mm travel window. This stopper sets the end position but does not lock the load without live air pressure.
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