Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20
The AirTAC SAIJ40X450-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 450 mm travel that can be fine-tuned down by up to 20 mm, yielding a precise 430-450 mm usable window. This allows exact end-position calibration without swapping hardware. Delivering 628 N of push force at 0.5 MPa, it handles medium-duty positioning reliably.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR configurations.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAIJ40BX450-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SAIJ40BX450-20 Is Used
Product Changeover
Dial in the 430-450 mm stroke window during format size changes on a packaging line, using the rear screw to set exact end positions without changing the cylinder.
Material Handling
Pushes or diverts items with 628 N of force at 0.5 MPa, relying on the fine-tuned end-stop to accommodate varying package dimensions safely.
Machine Setup
Provides exact end-position calibration during equipment commissioning, allowing operators to trim the 450 mm stroke by up to 20 mm for precise mechanical alignment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-20 the Right Cylinder?
Choose this 40 mm bore when an application demands precise mechanical end-stop tuning during commissioning or product changeover, stepping up from a 32 mm bore that yields 402 N at 0.5 MPa. The adjustable 430-450 mm window is ideal for dialing in exact positions without adding external stops. Because the 450 mm stroke is relatively long, ensure you provide an external guide to support the load and prevent excessive side-loading on the rod.
The rear adjuster acts purely as a travel stop and does not lock the load without live air pressure. If your setup requires true load-holding, select an external pilot-operated check valve or explore the SAIL or BSAI locking cylinder series. This model is dimensionally interchangeable per ISO 15552, requiring a 40 mm bore, 450 mm stroke, 20 mm adjustment, PT port, and standard mounting.
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 SAIJ40BX450-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the effective travel by up to 20 mm, creating a 430-450 mm usable window. It functions as a mechanical stop to fine-tune the end position and does not hold the load without continuous air pressure.
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