Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75 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 SAIJ40BX325-75
The AirTAC SAIJ40X325-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 325 mm travel by up to 75 mm for a precise 250-325 mm usable window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads.
Because the stroke extends past 300 mm, the 16 mm rod and M12x1.25 thread should be paired with an external guide to handle potential side loads on longer travels. The extruded aluminum barrel features sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75 |
|---|---|
| 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 SAIJ40BX325-75
| 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 SAIJ40BX325-75 Is Used
Machine Changeover
Quickly adapt the stroke window from 325 mm down to 250 mm during product size changes on a packaging line without replacing the cylinder.
End-Position Tuning
Fine-tune the exact retract distance at commissioning using the rear stopper, avoiding the need to bolt on external physical stops.
Variable Stops
Adjust the travel end on the fly for sorting or diverting applications where the physical contact point shifts based on product dimensions.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-75 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI when your application requires variable end-stops or fine-tuning during machine commissioning without swapping hardware. If you need less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air—use an external rod lock or SAIL cylinder for fail-safe holding.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm a 40 mm bore, 325 mm stroke, 75 mm adjustment range, PT G1/4 port, and your preferred mounting bracket from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Note that FB, CA, CB, and CR mounts are omitted from this series.
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 SAIJ40BX325-75 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a stop that lets you shorten the effective travel from the 325 mm nominal stroke down to 250 mm. It only sets the travel end and does not lock the load without live air pressure.
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