Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-10S 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 SAIJ40BX425-10S
The AirTAC SAIJ40X425-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel back by up to 10 mm, creating a 415-425 mm usable window for exact end-position tuning. It delivers 628 N of push force and 528 N of pull force at a 0.5 MPa operating pressure. This variant uses a SUS304 stainless steel rod (code B) for superior corrosion resistance and integrates a magnet for CMSE reed and DMSE electronic sensors.
Because the 425 mm stroke is relatively long for this 40 mm bore, the 16 mm rod and M12x1.25 thread need careful alignment to manage side loads. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster acts purely as a mechanical stop to fine-tune the retract position without needing external stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-10S |
|---|---|
| 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 SAIJ40BX425-10S
| 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 SAIJ40BX425-10S Is Used
Machine Changeover
Dial in the 415-425 mm retract position precisely during product size transitions without swapping cylinders.
End-Stop Tuning
Fine-tune the final end position during commissioning using the rear screw rather than adding external mechanical stops.
Long-Travel Diverting
Handle long-stroke diverting or sorting tasks where the exact retract distance needs slight on-site adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-10S the Right Cylinder?
Choose this adjustable-stroke model when you need to dial in the retract end at commissioning or during a product changeover, avoiding the need to swap out a fixed-stroke SAI cylinder. If your application requires more power, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa; dropping down to the 32 mm bore provides 402 N.
For setup, match the 40 mm bore, 425 mm stroke, 10 mm adjustment range, PT tapered port thread, and the -S magnet. Given the 425 mm travel, supporting the load with an external guide is recommended to prevent excessive side-loading on the rod. Note that the rear adjuster and air cushions only decelerate the stroke; they do not hold the load without live air. For true load-holding without pressure, consider an external rod lock, the SAIL series, or BSAI clamp-lock cylinders.
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 SAIJ40BX425-10S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds between 30 and 800 mm/s.
A rear mechanical stopper allows you to shorten the 425 mm nominal stroke by up to 10 mm, giving an effective travel window of 415 to 425 mm. This adjuster acts only as a travel stop and does not hold the load without continuous air pressure.
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