Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50 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 SAIJ40BX450-50
The AirTAC SAIJ40X450-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a precise 400-450 mm usable stroke window, enabling exact end-position tuning at commissioning without swapping hardware. It delivers 879 N of push force at 0.7 MPa and utilizes a PT tapered port thread for a tight pneumatic seal.
This model is equipped with a SUS304 stainless steel rod (code B) for superior corrosion resistance in humid or washdown environments. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the internal magnet, meaning electronic DMSE or reed CMSE sensors cannot be used without modification. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50 |
|---|---|
| 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 SAIJ40BX450-50
| 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 SAIJ40BX450-50 Is Used
Machine Changeovers
Dial in the 400-450 mm travel window during product size transitions without physically replacing the cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract distance at commissioning to perfect timing and mechanical engagement in automated assembly lines.
Washdown Automation
Leverage the SUS304 stainless steel rod for reliable operation in food processing or humid environments where standard carbon steel rods would corrode.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50 the Right Cylinder?
Choose this 40 mm bore when your application requires moderate thrust and variable end-stops; if you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, while stepping up to a 50 mm bore provides 1374 N. The adjustable stroke is ideal for machine changeovers where product sizes vary, replacing the need to bolt on external stops or swap out a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, this cylinder will not suffice, so consider an SAIL or BSAI locking model instead. Because the nominal stroke is 450 mm, the 16 mm rod and M12x1.25 thread should be guided externally to prevent excessive side-loading and premature seal wear.
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 SAIJ40BX450-50 FAQ
At a standard operating pressure of 0.7 MPa, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
A rear mechanical stopper allows you to shorten the nominal 450 mm stroke by up to 50 mm, providing a usable travel window of 400 to 450 mm. This adjuster sets the retract end-position but does not lock or hold the load without live air pressure.
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