Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75 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 SAIJ40BX450-75
The AirTAC SAIJ40X450-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel anywhere within a 375 to 450 mm window. Delivering 879 N of push force at 0.7 MPa, it is built 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 for straightforward position detection.
Because the nominal 450 mm stroke exceeds 300 mm, the 16 mm rod should be guided externally to prevent excessive side-loading on the piston. The rear stopper lets you dial in the exact retract end-position during commissioning without machining new hard stops, while the standard variable air cushions absorb kinetic energy at both travel ends.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75 |
|---|---|
| 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 SAIJ40BX450-75
| 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 SAIJ40BX450-75 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 375-450 mm window during machine setup to accommodate different material lengths without adding external hard stops.
Product Changeover
Quickly reconfigure the stroke on packaging or sorting lines by adjusting the rear screw, reducing downtime when switching between different package sizes.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for pushing or lifting tasks in washdown or mildly corrosive environments where standard carbon steel rods would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75 the Right Cylinder?
Select this 40 mm bore when an application requires moderate thrust (628 N push at 0.5 MPa) but demands a highly variable retract position; if you need more power, stepping up to the 63 mm bore yields 2182 N at 0.7 MPa. The 75 mm adjustment range is ideal for product changeovers where multiple end-stop distances are required on the same line. When specifying an ISO 15552 replacement, match the 40 mm bore, 450 mm stroke, PT ports, and the desired mounting set.
Remember that the rear adjuster functions strictly as a travel stop and the air cushions only decelerate the load; neither will hold the cylinder stationary without live air. For true load-holding without pneumatic pressure, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve. The SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options.
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 SAIJ40BX450-75 FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 741 N of pull force. At 0.5 MPa, the push force is 628 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from the 450 mm nominal length down to 375 mm. It sets the travel end-position but does not lock the load without continuous air pressure.
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