Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50 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 SAIJ40BX425-50
The AirTAC SAIJ40X425-50 is a double-acting 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. By turning the rear stopper screw, you can trim the effective travel down by up to 50 mm, creating a precise 375-425 mm usable stroke window for exact end-position tuning during commissioning.
This unit is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance. It uses PT tapered ports and lacks a piston magnet, meaning it is not set up for CMSE or DMSE electronic position sensing. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50 |
|---|---|
| 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 SAIJ40BX425-50
| 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 SAIJ40BX425-50 Is Used
Machine Changeover
Dial in the 375-425 mm travel window during product size changes without replacing the entire actuator or adding external mechanical stops.
End-Position Tuning
Fine-tune the exact retract position at commissioning to perfect a pressing or clamping operation, absorbing mechanical tolerance stack-ups.
Variable End Stops
Set custom retraction depths on automated machinery to handle different material thicknesses on the fly using the rear adjustment screw.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50 the Right Cylinder?
Choose this 40 mm bore when an application requires 628N of push force at 0.5 MPa, which is a step up from the 32 mm bore that provides 402N. The 50 mm adjustment range is ideal for product changeovers on a line, letting you fine-tune the end stop without swapping the cylinder or bolting on external stops. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an SAIL or BSAI cylinder.
Because this 425 mm stroke exceeds the typical unsupported length guidelines, the 16 mm rod and M12x1.25 thread will not prevent mechanical binding on their own. You must use an external guide to absorb side loads and prevent rod damage. To replace an ISO 15552 cylinder, match the 40 mm bore, 425 mm stroke, 50 mm adjustment, PT port, and the specified mounting hardware.
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 SAIJ40BX425-50 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 425 mm nominal stroke by up to 50 mm, providing a usable travel window of 375-425 mm. It only sets the travel end and does not lock or hold the load without continuous air pressure.
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