Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75S 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 SAIJ40BX450-75S
The AirTAC SAIJ40X450-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, featuring a 16mm SUS304 stainless steel rod. The integrated magnet enables position sensing with AirTAC CMSE or DMSE switches installed in the dual-side sensor grooves.
This specific SKU provides a 450mm nominal stroke that can be dialed back by up to 75mm, creating a precise 375-450mm usable travel window. The external rear stopper allows you to fine-tune the retract end position during commissioning without swapping out the entire cylinder or adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75S |
|---|---|
| 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 SAIJ40BX450-75S
| 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 SAIJ40BX450-75S Is Used
Product Changeover
Dial in the 375-450mm travel window on the fly to accommodate different package lengths on a packaging line without changing hardware.
Machine Setup
Fine-tune the retract end-position during initial commissioning to achieve exact alignment, using the rear stopper instead of custom spacers.
Variable End Stops
Adjust the stroke dynamically for diverter gates on a conveyor system, ensuring precise routing for varying product dimensions.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-75S the Right Cylinder?
Choose this 40mm bore when an application requires moderate force, stepping up from a 32mm bore (402N push at 0.5 MPa) but avoiding the bulk of a 50mm bore (982N push). An adjustable stroke is highly beneficial for machines that process varying product sizes, allowing operators to change the end-stop position quickly rather than relying on a fixed-stroke SAI cylinder. To replace this cylinder per ISO 15552 dimensions, match the 40mm bore, 450mm stroke, 75mm adjustment, PT G1/4 port, and the -S magnet.
Because this model features a 450mm stroke, the 16mm rod needs external guidance to prevent excessive side-loading and premature seal wear over long unsupported travels. For load-holding requirements without continuous air pressure, note that this cylinder's adjuster is not a brake; you should instead utilize an AirTAC SAIL locking cylinder or an external pilot-operated check valve.
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 SAIJ40BX450-75S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw allows you to reduce the 450mm nominal stroke by up to 75mm, providing a usable travel window of 375-450mm. This stopper decelerates the travel end but does not lock the load without live air pressure.
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