Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20 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 SAIJ40BX475-20
The AirTAC SAIJ40X475-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 455-475 mm usable travel window by trimming up to 20 mm off the 475 mm nominal stroke, allowing precise end-position tuning during commissioning without adding external stops. Delivering 879 N of push force at 0.7 MPa, it handles robust positioning tasks.
This model uses a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20 |
|---|---|
| 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 SAIJ40BX475-20
| 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 SAIJ40BX475-20 Is Used
Machine Commissioning
Fine-tune the 455-475 mm travel end-position during machine setup to dial in exact stopping points without swapping hardware.
Product Changeover
Quickly adjust the end-stop distance on a packaging line to accommodate different package lengths on the fly.
Variable End-Stop Forming
Set precise retraction limits for pressing or forming tasks that require slight positional shifts between workpieces.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX475-20 the Right Cylinder?
Choose this 40 mm bore cylinder when your setup requires a 455-475 mm stroke window and 879 N of thrust at 0.7 MPa. If you need less force, step down to a 32 mm bore offering 563 N; if your application demands more power, a 50 mm bore provides 1374 N. The adjustable stroke is ideal for variable end-stops and product changeovers, whereas a fixed SAI cylinder suits static travel lengths. For load-holding without continuous air pressure, use a SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 475 mm stroke, 20 mm adjustment, PT port, and mounting style. Because the 475 mm stroke is long, the 16 mm rod and M12x1.25 thread will experience leverage under side loads; always use an external guide to prevent rod bending.
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 SAIJ40BX475-20 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 128 kgf.
The rear adjuster screw allows you to shorten the effective travel from 475 mm down to 455 mm. This stopper mechanism fine-tunes the retract end-position but does not lock or hold the load without live air pressure.
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