Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30S 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 SAIJ40BX425-30S
The AirTAC SAIJ40X425-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 395-425mm. Delivering 628N of push force and 528N of pull force at 0.5MPa, it is built for precise positioning tasks. This variant includes a SUS304 stainless steel rod for corrosion resistance and an integrated magnet for CMSE reed and DMSE electronic sensors.
The rear adjustment screw allows you to fine-tune the end position at commissioning without adding external stops. Because the stroke is 425mm, the 16mm rod and M12x1.25 thread should be supported by an external guide to prevent excessive side-loading. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30S |
|---|---|
| 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 SAIJ40BX425-30S
| 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 SAIJ40BX425-30S Is Used
Machine Changeover
Dial in the 395-425mm travel window during product size changes without physically swapping the cylinder or repositioning external hard stops.
End-Position Tuning
Fine-tune the retract stroke end during commissioning to absorb mechanical tolerances and achieve precise feeding or clamping distances.
Variable Diverter Arm
Adjust the stroke length on the fly to accommodate different package sizes moving down a handling line, ensuring accurate diversion.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-30S the Right Cylinder?
Choose this 40mm bore when the 32mm class (402N push at 0.5MPa) is insufficient, but the 50mm class (982N) is oversized. The 30mm adjustment range is ideal for product changeovers on a line, acting as a variable end-stop. For holding loads without live air pressure, note that the adjuster and air cushions act only as travel stops, not locks; consider SAIL or BSAI cylinders for true load-holding. As a dimensionally interchangeable ISO 15552 cylinder, specify the 425mm stroke, 30mm adjust, PT tapered ports, and -S magnet for an exact replacement match.
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 SAIJ40BX425-30S FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. The standard speed range is 30-800mm/s.
The rear adjuster screw acts as a mechanical stop that can shorten the 425mm nominal stroke by up to 30mm, giving an effective travel range of 395-425mm. It only sets the travel end and does not lock the load without live air.
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