Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20S 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 SAIJ40BX475-20S
The AirTAC SAIJ40X475-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. With a nominal 475 mm stroke and a 20 mm adjustment range, it provides a usable travel window of 455 to 475 mm without requiring external stops. In the 40 mm bore class, it delivers 879 N of push force at 0.7 MPa.
This specific SKU features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for position sensing with CMSE reed or DMSE solid-state switches. The extruded aluminum barrel includes sensor grooves on both sides, and the unit uses PT tapered port threads (G1/4). The rear adjuster acts purely as a travel stop to set deceleration and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20S |
|---|---|
| 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 SAIJ40BX475-20S
| 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 SAIJ40BX475-20S Is Used
Machine Changeover
Dial in the exact 455-475 mm end position during product size changes without swapping the cylinder or adding external mechanical stops.
Variable End Stops
Set the precise retract stop for diverter arms or pushers on a packaging line, using the rear screw to trim the final 20 mm of travel.
Commissioning Fine-Tune
Perfectly align tooling at initial setup by adjusting the rear stopper, avoiding the need to shim or physically alter the mounting footprint.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20S the Right Cylinder?
Choose this adjustable-stroke model when an application requires variable end-stops or frequent machine changeovers, rather than a fixed-stroke SAI cylinder. If you need to step up force, the 50 mm bore provides 1374 N at 0.7 MPa, or you can step down to the 32 mm bore for 563 N. Because the 475 mm stroke is long, the 16 mm rod and M12x1.25 thread still require an external guide to prevent side-loading damage on unsupported loads.
For load-holding without live air pressure, the rear adjuster is not a lock; you must use an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock. To replace an ISO 15552 cylinder, match the 40 mm bore, 475 mm stroke, 20 mm adjustment, PT G1/4 ports, and the -S magnet. Mounting options include 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 SAIJ40BX475-20S FAQ
At 0.7 MPa operating pressure, this 40 mm bore double-acting cylinder generates 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 475 mm down to 455 mm. It sets the travel end and deceleration point but does not lock or hold the load without continuous air pressure.
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