Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75S 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 SAIJ40BX425-75S
The AirTAC SAIJ40X425-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel. With a 425 mm nominal stroke and a 75 mm adjustment range, it provides a usable travel window of 350-425 mm. This allows you to fine-tune the retract end position at commissioning without swapping out the cylinder or adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This SKU is built with a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet (-S) for position sensing. It is compatible with AirTAC CMSE reed and DMSE solid-state sensors, which seat neatly into the dual-side sensor grooves on the extruded aluminum barrel. The 16 mm rod and M12x1.25 thread handle moderate side loads, but at 425 mm of travel, an external guide is recommended to prevent rod deflection. It uses PT tapered ports and omits the FB, CA, CB, and CR mountings, supporting Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75S |
|---|---|
| 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 SAIJ40BX425-75S
| 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 SAIJ40BX425-75S Is Used
Product Changeover
Dial in the 350-425 mm travel window during packaging line format changes to accommodate varying carton sizes without physically swapping cylinders.
Commissioning Calibration
Fine-tune the retract end-stop during machine setup to perfect sensor alignment and prevent mechanical crashes before final lock-down.
Variable End Stops
Adjust the stroke on the fly for diverter gates that need to route different product widths down a single handling line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa and a 350-425 mm travel window that can be dialed in on the fly. If your application requires less force, the 32 mm bore offers 402 N; if you need more, the 50 mm bore provides 982 N. The adjustable stroke is ideal for machine changeovers or variable product sizes, whereas a fixed SAI cylinder locks you into one exact end position. Because the 425 mm stroke exceeds typical compact lengths, always pair it with an external guide to manage side loads.
For drop-in ISO 15552 interchangeability, match the 40 mm bore, 425 mm stroke, 75 mm adjustment, PT port thread, and -S magnet. Remember that the rear adjuster acts as a travel stop, not a lock. The SAIJ does not hold loads without live air pressure; if you need true load-holding, use an external rod lock, a pilot-operated check valve, or select the SAIL or BSAI series instead.
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 SAIJ40BX425-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 425 mm nominal stroke by up to 75 mm, creating a usable travel window of 350-425 mm. It only sets the end position and does not lock the load without live air pressure.
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