Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50S 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 SAIJ40BX375-50S
The AirTAC SAIJ40X375-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 325 to 375 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning without swapping the cylinder or adding external stops. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits medium-duty applications perfectly.
This variant features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel offers sensor grooves on both sides. Because the 375 mm stroke is relatively long for the 16 mm rod, an external guide is recommended to manage side loads. The rear adjuster acts strictly as a travel stop, not a lock, so live air is required to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50S |
|---|---|
| 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 SAIJ40BX375-50S
| 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 SAIJ40BX375-50S Is Used
Machine Changeover
Fine-tune the 325-375 mm travel window during product size changes on a packaging line without physically swapping out the cylinder.
Variable End Stops
Adjust the retract position on the fly to accommodate different package lengths moving down a conveyor system.
Setup Calibration
Dial in the exact end position during machine commissioning to prevent crushing forces, using the rear stopper rather than adding external shims.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-50S the Right Cylinder?
Choose this 40 mm bore when you need the 628 N thrust class but require precise end-position tuning for product changeovers; step down to a 32 mm bore if your application only requires 402 N of push force at 0.5 MPa. An adjustable stroke is ideal here for variable end stops, whereas a fixed-stroke SAI cylinder would require physical shimming for every changeover. To replace an ISO 15552 cylinder, match the 40 mm bore, 375 mm stroke, 50 mm adjustment, PT tapered ports, and the -S magnet. Given the 375 mm stroke, ensure your setup includes an external guide to support the rod against side loads. For load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as this adjuster is only a stop.
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 SAIJ40BX375-50S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 325 to 375 mm. It acts as a mechanical stop to fine-tune the end position, but it is not a lock, so live air is still required to hold the load.
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. The -S suffix indicates it has a built-in magnet, making it fully compatible with AirTAC CMSE reed switches and DMSE electronic sensors for position detection.
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