Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S
The AirTAC SAIJ40X325-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 325 mm nominal stroke by up to 75 mm. This creates a 250-325 mm usable travel window, giving you precise control over the retract end position without adding external stops. In the 40 mm bore class, it delivers 879 N of pull force at 0.7 MPa and runs at speeds of 30-800 mm/s.
This variant features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for position sensing. You can mount reed CMSE or solid-state DMSE switches in the extruded aluminum barrel's sensor grooves. The rear adjuster acts purely as a travel stop to set the end position; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 325 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 SAIJ40BX325-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×325 | 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 SAIJ40BX325-75S Is Used
Machine Changeovers
Fine-tune the 250-325 mm retract position on the fly when swapping product sizes on a packaging line, eliminating the need to physically swap cylinders.
End-Stop Calibration
Dial in the exact end position during initial commissioning to perfect a pressing or clamping operation without machining external hard stops.
Variable Diverting
Adjust the stroke length on a conveyor diverter arm to accommodate different package depths without reprogramming the machine controller.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75S the Right Cylinder?
Choose this 40 mm bore when you need 879 N of pull force at 0.7 MPa and a variable retract stop for product changeovers. If your process requires less force, the 32 mm bore offers 345 N of pull at 0.5 MPa; for heavier tasks, the 50 mm bore provides 825 N of pull at 0.5 MPa. Because the 325 mm stroke is relatively long, an external guide is recommended to prevent rod side-loading and premature wear.
Select the adjustable SAIJ over a fixed SAI when you need to fine-tune the end-of-stroke position during commissioning. This model is dimensionally interchangeable with ISO 15552 cylinders. Configuration: 40 mm bore, 325 mm stroke, 75 mm adjustment, PT tapered ports, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and a -S magnet.
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 SAIJ40BX325-75S FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of pull force and 628 N of push force. At the maximum operating pressure of 1.0 MPa, it delivers 128 kgf.
The rear adjuster screw lets you shorten the 325 mm nominal stroke by up to 75 mm, creating a 250-325 mm usable travel window. The adjuster acts as a mechanical stop to set the position and does not lock or hold the load without continuous air pressure.
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