Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30
The AirTAC SAIJ40X425-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a 16mm carbon steel rod with an M12x1.25 thread. By turning the external rear stopper screw, you can fine-tune the retract end-position, creating a usable travel window of 395 to 425mm without adding external stops.
This specific SKU features a SUS304 stainless steel rod (option B) for superior corrosion resistance in humid or washdown environments. It includes variable air cushions at both ends to decelerate the moving load smoothly. The extruded aluminum barrel integrates sensor grooves on both sides, allowing direct mounting of CMSE reed or DMSE electronic sensors if a magnet is added later. Fluid must be filtered air, operating safely between -20 and +70 C.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-30 Is Used
Machine Changeover
Dial in the exact 395-425mm end-stop during product size transitions without physically replacing the cylinder.
Assembly Positioning
Fine-tune the retract position to account for mechanical tolerances and ensure perfect part placement.
Washdown Conveying
Leverage the SUS304 stainless steel rod to reliably actuate diverters in humid or occasionally rinsed environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30 the Right Cylinder?
Choose this 40mm bore when your application requires less thrust than the 50mm option (982N push at 0.5 MPa) but more than the 32mm bore (402N). An adjustable stroke is highly beneficial here for product changeovers, letting you dial in the exact 395-425mm end-stop during commissioning rather than machining custom spacers or swapping to a fixed-stroke SAI cylinder. The PT tapered port thread ensures a tight, reliable pneumatic seal.
Because the nominal stroke is 425mm, the 16mm rod is highly susceptible to side-loading and deflection; an external guide rail is strongly recommended to prevent premature seal wear. The rear adjuster acts purely as a mechanical travel stop and cannot hold the load without live air pressure. For true fail-safe load holding, consider the SAIL pneumatic lock or BSAI clamp-lock series. Mounting options are restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ40BX425-30 FAQ
At 0.5 MPa it provides 628N push and 528N pull force. At 0.7 MPa the push force increases to 879N, and it reaches 1130N at 0.9 MPa.
A rear stopper screw lets you shorten the nominal 425mm stroke by up to 30mm, giving an adjustable travel window of 395 to 425mm to fine-tune the end position.
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