Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40 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 SAIJ40BX325-40
The AirTAC SAIJ40X325-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end-of-travel position. Outfitted with a SUS304 stainless steel rod and PT tapered ports, it delivers a 628N push force at 0.5 MPa and 879N at 0.7 MPa. The integrated rear stopper creates a 285 to 325 mm usable travel window, letting you dial in the exact retract distance without swapping hardware.
Because the nominal 325 mm stroke exceeds the rod's own diameter, an external guide is recommended to prevent excessive side-loading on the piston. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches, though this specific SKU ships without a magnet. The rear adjustment screw acts purely as a physical stop to set the travel endpoint and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40 |
|---|---|
| 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 SAIJ40BX325-40
| 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 SAIJ40BX325-40 Is Used
Machine Setup & Changeover
Dial in the exact 285-325 mm retract position during line changeovers without disassembling the cylinder or adding external stopper blocks.
Variable Product Diverting
Adjust the stroke endpoint on the fly to accommodate different package sizes moving down a conveyor without reprogramming the motion controller.
End-Position Calibration
Fine-tune the final retract stop during machine commissioning to perfectly align a tooling plate, compensating for mechanical tolerance stack-up.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40 the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm version (402N at 0.5 MPa) but want a smaller footprint than the 50 mm bore (982N at 0.5 MPa). An adjustable stroke is ideal for product changeovers where the retract distance varies slightly, eliminating the need to machine custom spacers or buy a fixed-stroke SAI cylinder for every job. If your process requires the cylinder to hold its position against a load when air pressure is removed, note that the SAIJ adjuster is only a travel stop; you should look at the SAIL or BSAI series, or add an external rod lock.
To match this exact configuration for an ISO 15552 interchange, specify a 40 mm bore, 325 mm nominal stroke, 40 mm adjustment range, PT tapered port thread, SUS304 (B) rod material, and no magnet. The supported mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard cylinders.
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 SAIJ40BX325-40 FAQ
At 0.5 MPa operating pressure, it provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw lets you shorten the 325 mm nominal stroke by up to 40 mm, creating a usable travel window of 285 to 325 mm. It acts as a physical stop to set the end position and does not function as a lock to hold the load without air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.