Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50
The AirTAC SAIJ40X375-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window down to 325 mm from its 375 mm nominal stroke. This on-machine adaptability eliminates the need to swap hardware or bolt on external stops during product changeovers. It delivers a robust 879 N push force at 0.7 MPa, making it well-suited for moderate-duty industrial actuation.
Equipped with a SUS304 stainless steel rod (code B) for superior corrosion resistance, this unit utilizes a PT tapered port thread and dual-side sensor grooves. It is important to note that the rear adjuster functions strictly as a travel stop to set deceleration endpoints, not as a locking device; it cannot hold a load without continuous air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 375 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 SAIJ40BX375-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×375 | 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 SAIJ40BX375-50 Is Used
Product Changeover
Dial in the exact end-position during packaging line format changes without replacing the cylinder or adding external mechanical stops.
Machine Setup
Fine-tune the 325-375 mm travel window during commissioning to perfectly time the stroke and prevent hard mechanical crashes.
Variable End Stops
Adapt the retract position on the fly for automated assembly equipment processing multiple part sizes on the same fixture.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50 the Right Cylinder?
Select this 40 mm bore model when an application requires a 325-375 mm adjustable stroke window and 879 N of push force at 0.7 MPa. If your process demands less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, whereas heavier loads require the 50 mm bore providing 1374 N. The adjustable rear screw is ideal for commissioning fine-tuning, whereas a fixed-stroke SAI cylinder is preferred if the end-stop never changes.
Because the 375 mm stroke creates a long unsupported rod extension, an external guide is recommended to prevent excessive side-loading and premature seal wear. For true load-holding without live air pressure, this cylinder is insufficient; you should instead consider an AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) variant. This SAIJ model supports mounting interfaces 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 SAIJ40BX375-50 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can achieve up to 1130 N push force at 0.9 MPa.
The rear adjuster acts as an external stopper that allows you to shorten the effective stroke by up to 50 mm, providing a usable travel window of 325-375 mm. It sets the travel end and deceleration point but does not lock or hold the load without live air pressure.
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