Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100S 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 SAIJ40BX425-100S
The AirTAC SAIJ40X425-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 325-425mm usable travel window. Equipped with a SUS304 stainless steel rod, it delivers 628N of push force at 0.5 MPa and uses PT tapered ports for pneumatic connections.
Because the nominal 425mm stroke is relatively long for this bore size, the 16mm rod diameter should be guided externally to prevent excessive side-loading. The -S magnet integrates directly with AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves, while the rear stopper allows precise end-position tuning without adding external physical stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100S |
|---|---|
| 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 SAIJ40BX425-100S
| 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 SAIJ40BX425-100S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 325-425mm window during machine setup, accommodating different product sizes without mechanical rebuilds.
Product Changeover Systems
Rapidly adjust the stroke length on packaging or sorting lines to handle varying package dimensions on the fly using the rear stopper screw.
Sensor-Verified Actuation
Leverage the built-in magnet with DMSE electronic sensors to confirm exact end-of-stroke positions after fine-tuning the travel limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100S the Right Cylinder?
Choose this 40mm bore when an application requires approximately 628N of push force at 0.5 MPa, stepping up from a 32mm bore (402N) or down from a 50mm bore (982N). The 100mm adjustment range is ideal for product changeovers, letting you dial in the exact end-of-stroke position during commissioning rather than swapping the entire cylinder.
Remember that the rear adjuster functions strictly as a travel stop, not a locking device; it cannot hold a load without continuous air pressure. For position-holding requirements, consider an AirTAC SAIL or BSAI cylinder. This SAIJ model supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. As a dimensionally interchangeable ISO 15552 cylinder, it provides a direct form-fit replacement for standard ISO profiles.
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 SAIJ40BX425-100S FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke from its 425mm nominal length down to 325mm. It only sets the travel end and does not lock the load without live air pressure.
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