Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50
The AirTAC SAIJ40X90-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 90 mm stroke that can be fine-tuned down by up to 50 mm, yielding a highly flexible 40-90 mm usable travel window. This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads. Delivering 879 N of push force at 0.7 MPa, it is built for rigorous daily cycling.
Unlike a fixed-stroke SAI cylinder, the external rear stopper allows you to dial in the exact end position during commissioning without adding external stops. The adjustment mechanism acts solely as a travel stop and works in tandem with the variable air cushions at both ends to decelerate the load. For applications requiring position holding without live air pressure, a plain SAIJ will not act as a lock, so you should explore the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 90 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 SAIJ40BX90-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SAIJ40BX90-50 Is Used
Machine Changeover
Dial in the exact end-stop distance on the fly when switching the production line to a new product size, using the 50 mm adjustment window to avoid swapping cylinders.
End-Position Tuning
Fine-tune the retract stroke during initial commissioning to perfectly mate the tooling with the workpiece without adding bulky external stopper blocks.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod in washdown or humid assembly areas where a standard carbon steel rod would pit and fail over time.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50 the Right Cylinder?
Choose this 40 mm bore when your application requires around 879 N of push force at 0.7 MPa, or step up to the 50 mm bore if you need 1374 N. The 50 mm adjustment range on this 90 mm stroke is exceptionally wide, making it ideal for machines that undergo frequent product-size changeovers. Because it is dimensionally interchangeable per ISO 15552, you can directly match the bore, 90 mm stroke, 50 mm adjustment, PT port thread, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting footprints. Note that this variant lacks a magnet (-S), so it will not work with CMSE or DMSE sensors without a rod magnet.
Since the 90 mm stroke is relatively short, side-loading is less of a concern than with longer strokes, but you should still ensure the load is guided to prevent binding. The SUS304 rod material is specifically selected here for environments where moisture or corrosive elements would degrade a standard carbon steel rod.
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 SAIJ40BX90-50 FAQ
The rear adjusting screw acts as a mechanical stopper that limits the retract travel. For this model, you can trim the 90 mm nominal stroke back by up to 50 mm, giving you a usable travel window of 40 to 90 mm depending on your setup.
At a 0.7 MPa operating pressure, the SAIJ40X90-50 provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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