Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75 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 SAIJ40BX425-75
The AirTAC SAIJ40X425-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 350 to 425 mm, allowing you to dial back the nominal 425 mm stroke by up to 75 mm. This bore size delivers 628 N of push force at 0.5 MPa, making it well-suited for moderate-duty positioning tasks.
This configuration includes a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides for direct CMSE or DMSE switch mounting. Because the stroke is 425 mm, an external guide is recommended to prevent excessive side-load wear on the M12x1.25 rod thread.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75 |
|---|---|
| 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 SAIJ40BX425-75
| 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 SAIJ40BX425-75 Is Used
Variable End-Stop Positioning
Dial the travel back by up to 75 mm during product changeovers to set precise retract distances without adding external physical stops to your machine frame.
Commissioning Fine-Tuning
Perfect the final end-position at machine setup by trimming the stroke within the 350 to 425 mm window, ensuring exact alignment without cylinder replacement.
Adjustable Transfer Stroke
Modify the extension length on the fly to accommodate different package sizes on a conveyor line, using the rear screw to set the exact transfer endpoint.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-75 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when your machine setup requires commissioning fine-tuning or variable end-stops without physically swapping hardware. If your application demands less force, stepping down to a bore 32 unit yields 402 N at 0.5 MPa. For higher force, a bore 50 provides 982 N.
The rear adjuster acts purely as a travel stop to decelerate the load, not as a lock. A plain SAIJ cylinder will not hold its load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series. This unit is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX425-75 FAQ
At 0.5 MPa operating pressure, this bore 40 cylinder provides 628 N of push force and 528 N of pull force. At 0.9 MPa, the push force increases to 1130 N.
The rear adjuster screw acts as a mechanical stop that shortens the effective travel. For this 425 mm stroke model, you can trim the retract end-position back by up to 75 mm, creating a usable travel window of 350 to 425 mm.
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