Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20 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 SAIJ40BX425-20
The AirTAC SAIJ40X425-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 425 mm travel to a precise 405-425 mm window. Built with a SUS304 stainless steel rod (option B) and PT tapered ports, it delivers 879 N of push force at 0.7 MPa. This makes it highly effective for environments requiring corrosion resistance and exact end-position tuning.
Because the adjuster acts strictly as a mechanical stop on the retract end, it decelerates travel without locking the load. You can fine-tune the position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel features sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20 |
|---|---|
| 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 SAIJ40BX425-20
| 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 SAIJ40BX425-20 Is Used
Product Changeovers
Dial in the 405-425 mm travel window during format changes on a packaging line without physically swapping cylinders or adding external stopper blocks.
Variable End Stops
Sort or divert items on a conveyor by adjusting the retract end-position by up to 20 mm to accommodate different package depths on the fly.
Machine Setup
Fine-tune the tooling approach distance during initial commissioning, using the rear screw to set the exact 425 mm maximum stroke or trim it back to 405 mm.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20 the Right Cylinder?
Select this 40 mm bore when an application demands precise variable end-stops; if you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, while stepping up to a 50 mm bore provides 1374 N. Choose the SAIJ adjustable format over a fixed SAI cylinder when machine setups require product-size changeovers or commissioning fine-tunes. Since the plain SAIJ lacks a lock, use a SAIL or BSAI cylinder if the load must be held without live air pressure.
For this 425 mm stroke, the 16 mm rod and M12x1.25 thread provide rigidity, but an external guide is recommended to prevent side-loading on long unsupported travels. This model is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX425-20 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 739 N of pull force. It reaches a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from the 425 mm nominal length down to 405 mm. It only sets the travel end and does not lock the load without live air pressure.
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