Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-100 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 SAIJ40BX450-100
The AirTAC SAIJ40X450-100 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 350 to 450 mm usable travel window, allowing you to dial back the 450 mm nominal stroke by up to 100 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm bores and heavier 50 mm units.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threading. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is configured without a magnet for position sensing. The rear adjuster acts purely as a mechanical stop to set the retract end position, meaning it cannot hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-100 |
|---|---|
| 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 SAIJ40BX450-100
| 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 SAIJ40BX450-100 Is Used
Machine Changeover
Fine-tune the retract end position up to 100 mm during product size changeovers without replacing the cylinder or bolting on external stops.
Variable End-Stop Positioning
Set precise ejection or transfer points on a packaging line by adjusting the 350 to 450 mm travel window to match varying package lengths.
Commissioning Calibration
Dial in the exact stroke during machine setup to prevent mechanical interference, leveraging the 628 N push force for light-duty actuation.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-100 the Right Cylinder?
Choose this 40 mm bore adjustable cylinder when an application requires exact end-position tuning without adding external stops or swapping components. If your process needs greater thrust, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa. Because the 450 mm stroke is relatively long for a 40 mm bore, the 16 mm rod and M12x1.25 thread provide robust support, but an external guide is strongly recommended to prevent side-loading damage.
This cylinder is dimensionally interchangeable per ISO 15552 standards. It uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. For applications requiring the load to stay fixed without live air, consider the SAIL or BSAI locking variants, as the SAIJ adjuster is strictly a travel stop and not a locking brake.
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 SAIJ40BX450-100 FAQ
The nominal stroke is 450 mm, but the rear adjuster allows you to shorten the effective travel by up to 100 mm, creating a usable stroke window of 350 to 450 mm.
No, the rear adjuster and air cushions only set and decelerate the travel end points. The cylinder does not function as a lock or brake and cannot hold a load without live air pressure.
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