Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-10 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 SAIJ40BX325-10
The AirTAC SAIJ40X325-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 315 to 325 mm usable travel window for precise end-position tuning. Delivering 628 N of push force at 0.5 MPa, it uses a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread for a robust pneumatic seal. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Because the nominal 325 mm stroke exceeds three times the 40 mm bore diameter, an external guide rail is strongly recommended to prevent excessive side-loading on the rod. The rear adjuster acts purely as a mechanical stop to trim the retract distance and must not be confused with a locking device; it cannot hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-10 |
|---|---|
| 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 SAIJ40BX325-10
| 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 SAIJ40BX325-10 Is Used
Machine Setup Tuning
Dial in the exact retract distance during commissioning by up to 10 mm to perfect the seating position without adding external stoppers.
Product Changeover
Quickly adapt a packaging line for different carton lengths by adjusting the end-stop within the 315-325 mm travel window.
Corrosive Assembly Tasks
Leverage the SUS304 stainless steel rod for light-duty pushing (628 N at 0.5 MPa) in environments requiring high rust resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-10 the Right Cylinder?
Choose this 40 mm bore cylinder when you need slightly more thrust than the 32 mm variant (402 N at 0.5 MPa) but want to avoid the bulk of a 50 mm unit (982 N at 0.5 MPa). The 10 mm rear adjustment screw is ideal for product changeovers on a line, allowing you to dial in the end-stop at commissioning without physically swapping the cylinder or bolting on external stops. For applications requiring true load-holding without live air pressure, this standard SAIJ is insufficient—consider the AirTAC SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, verify the 40 mm bore, 325 mm stroke, up to 10 mm adjustment range, PT port thread, and your preferred mounting bracket from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this adjustable series. The operating speed ranges from 30 to 800 mm/s.
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 SAIJ40BX325-10 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 325 mm nominal stroke down to 315 mm. It is a travel stop only, not a lock, and the cylinder still requires live air to hold its position.
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