Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50S 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 SAIJ40BX450-50S
The AirTAC SAIJ40X450-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 628N of push force at 0.5 MPa. The integrated SUS304 stainless steel rod provides excellent corrosion resistance for demanding environments. Because this SKU carries a 50mm adjustment code, you can dial the effective travel back from its 450mm nominal length to anywhere within a 400-450mm usable window without swapping hardware.
This adjustable travel capability allows precise end-position tuning during commissioning or product changeovers, eliminating the need for external stops. The extruded aluminum barrel features sensor grooves on both sides, and the included magnet (-S) directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact position feedback.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50S |
|---|---|
| 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 SAIJ40BX450-50S
| 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 SAIJ40BX450-50S Is Used
Product Changeovers
Dial in the 400-450mm travel window during line changeovers to handle different package lengths without physically replacing the cylinder.
End-Stop Tuning
Fine-tune the retract position at machine commissioning using the rear screw, avoiding the need to bolt on custom external mechanical stops.
Variable Positioning
Sort or divert items on a conveyor by adjusting the stroke length on the fly to meet specific pusher distances for various product sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX450-50S the Right Cylinder?
Select this 40mm bore when an application requires roughly 628N of push force at 0.5 MPa; stepping down to a 32mm bore drops that output to 402N, while a 63mm bore increases it to 1559N. An adjustable stroke is chosen over a fixed SAI cylinder when you need on-the-fly end-stop tuning to accommodate varying product sizes on a single line. Keep in mind the rear adjuster acts strictly as a travel stop and does not hold the load without live air—use an AirTAC SAIL or BSAI cylinder for true pneumatic locking. To replace an ISO 15552 cylinder, match the 40mm bore, 450mm stroke, 50mm adjustment, PT tapered port, and -S magnet. Because the 450mm stroke is relatively long, ensure external guide rails are used to prevent excessive side-loading on the 16mm rod.
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 SAIJ40BX450-50S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. If operated at 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop that lets you shorten the 450mm nominal stroke by up to 50mm, creating a 400-450mm usable travel window. It only sets the end position and does not lock the load without continuous air pressure.
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