Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-40S 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 SAIJ40BX375-40S
The AirTAC SAIJ40X375-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 335-375mm. Delivering 879N of push force at 0.7MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread. The integrated magnet (-S) supports CMSE reed and DMSE electronic sensors for precise position feedback.
This adjustable-stroke design allows you to fine-tune end positions at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-40S |
|---|---|
| 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 SAIJ40BX375-40S
| 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 SAIJ40BX375-40S Is Used
Changeover Calibration
Dial in the 335-375mm travel window during product size changeovers on a packaging line without disassembling the pneumatic setup.
End-Stop Trimming
Fine-tune the retract position during machine commissioning to avoid mechanical crashes, using the rear screw instead of external stops.
Variable Diverting
Adjust the actuation length on the fly to accommodate different package sizes moving down a conveyor system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-40S the Right Cylinder?
Choose this 40mm bore when you need more thrust than the 32mm version (402N at 0.5MPa) but want a more compact footprint than the 63mm option (1559N at 0.5MPa). An adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, whereas a fixed-stroke SAI cylinder is better for static, repetitive movements.
Because the 375mm stroke is relatively long, the 16mm rod and M12x1.25 thread still require an external guide to prevent excessive side-loading on the unsupported extension. For any application requiring the load to be held in place without continuous air pressure, this cylinder is not sufficient since the adjuster is not a lock; consider the SAIL or BSAI series instead.
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 SAIJ40BX375-40S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 375mm down to 335mm. This creates a 40mm usable window for fine-tuning the end position at commissioning without replacing the cylinder.
At a 0.7MPa operating pressure, the SAIJ40X375-40-S generates 879N of push force and 528N of pull force. It can deliver up to 1130N push force at 0.9MPa.
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