Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 475mm 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
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40
The AirTAC SAIJ40X475-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 475 mm nominal travel by up to 40 mm for a precise 435-475 mm usable window. Delivering 879 N of push force at 0.7 MPa, it features a SUS304 stainless steel rod for superior corrosion resistance and an extruded aluminum barrel with sensor grooves on both sides. This configuration uses PT tapered port threads and operates at speeds between 30-800 mm/s.
Because the rear screw acts purely as a mechanical stop to set the end position, it does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI variants. This adjustable design eliminates the need to swap cylinders or bolt on external stops during product changeovers, and it retains the standard ISO 15552 mounting interface while omitting FB, CA, CB, and CR brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 475 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 SAIJ40BX475-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×475 | 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 SAIJ40BX475-40 Is Used
Product Size Changeovers
Quickly adapt the 435-475 mm travel window on packaging lines running varied container sizes, using the rear screw to set new end positions without changing hardware.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact seating forces, dialing back up to 40 mm to perfect the motion profile.
Variable Stops on Conveyors
Serve as an adjustable diverter or stopper arm on material handling systems where the exact product push-off distance requires occasional adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-40 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore that provides 563 N, or down from a 50 mm bore offering 1374 N. The 40 mm adjustment range is ideal for production lines running mixed product sizes, allowing operators to fine-tune the retract end-position at commissioning without replacing the fixed-stroke SAI equivalent. When ordering a replacement, verify the 475 mm stroke, 40 mm adjust code, PT port thread, and required mounting bracket (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
With a 475 mm stroke, the 16 mm diameter piston rod and M12x1.25 rod thread provide a robust interface, but long unsupported strokes inherently invite deflection. An external guide mechanism should be incorporated to prevent excessive side-loading and premature seal wear.
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 SAIJ40BX475-40 FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 739 N of pull force. At 0.5 MPa, the push force is 628 N.
The rear adjuster screw allows you to mechanically shorten the 475 mm nominal stroke by up to 40 mm, creating a usable travel window of 435-475 mm. The adjuster functions as a travel stop and does not lock the load without continuous air pressure.
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