Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40S 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 SAIJ40BX450-40S
The AirTAC SAIJ40X450-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 410-450 mm, allowing you to dial back the 450 mm nominal stroke by up to 40 mm during commissioning without adding external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant includes a SUS304 stainless steel rod for corrosion resistance and a -S magnet for position sensing with AirTAC CMSE reed or DMSE electronic switches. It uses PT tapered ports sized G1/4, and the extruded aluminum barrel incorporates sensor grooves on both sides. The rear adjuster functions strictly as a travel stop to fine-tune the end position, not as a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40S |
|---|---|
| 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 SAIJ40BX450-40S
| 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 SAIJ40BX450-40S Is Used
Machine Changeover
Dial in the 410-450 mm travel window during product size transitions to set new end positions quickly without physically swapping the cylinder.
End-Position Tuning
Fine-tune the retract stroke by up to 40 mm at commissioning to perfectly align tooling offsets without machining custom spacers.
Variable Stop Placement
Adjust the stopping point on a moving conveyor line to accommodate different package lengths without adding external mechanical stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-40S the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI when your setup requires variable end-stops for product changeovers or precise end-position tuning. If your application needs less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. Because the stroke is 450 mm, the M12x1.25 rod should be guided externally to prevent excessive side-loading and premature seal wear.
For an exact ISO 15552 replacement, match the 40 mm bore, 450 mm stroke, 40 mm adjustment code, PT port thread, and -S magnet. Remember that a plain SAIJ does not hold its position without live air pressure—the rear adjuster only sets the travel end. For true load-holding without continuous air, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ40BX450-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1130 N of push force.
A rear adjusting screw acts as a stopper, allowing you to shorten the effective stroke from 450 mm down to a minimum of 410 mm. This creates a 40 mm adjustable window for fine-tuning the end position at commissioning.
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