Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20S 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 SAIJ40BX90-20S
The AirTAC SAIJ40X90-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 70 to 90 mm, allowing you to dial back the 90 mm nominal stroke by up to 20 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for corrosion resistance and includes a magnet for position sensing.
This model uses PT tapered port threads and operates at speeds from 30 to 800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, seamlessly accommodating CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without adding external stops, while the shared mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20S |
|---|---|
| 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 SAIJ40BX90-20S
| 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 SAIJ40BX90-20S Is Used
Changeover Calibration
Dial in the 70-90 mm travel window during machine setup to perfectly position parts of varying sizes without changing the cylinder.
Variable End-Stop Diverting
Fine-tune the retract position on the fly to accommodate different package lengths on a packaging line.
Corrosive Environment Gauging
Leverage the SUS304 stainless rod and precise stroke adjustment for accurate positioning in washdown or corrosive manufacturing settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-20S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from the 32 mm bore (402 N) for heavier handling, or down from the 50 mm bore (982 N) to save space. The adjustable 70-90 mm travel window is ideal for product changeovers where exact end-position tuning is required without swapping cylinders. For ISO 15552 replacement matching, specify bore 40, stroke 90, 20 mm adjustment, PT ports, and the -S magnet.
Because the stroke is under 300 mm, side-load stress on the 16 mm rod is manageable, though external guides are recommended for heavy lateral loads. Remember that the SAIJ rear adjuster is a travel stop, not a lock; it will not hold a load without live air pressure. For fail-safe load holding, consider the AirTAC SAIL or BSAI clamp-lock 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 SAIJ40BX90-20S FAQ
At 0.5 MPa operating pressure, 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.
The rear adjuster acts as a mechanical stop that lets you shorten the 90 mm nominal stroke by up to 20 mm, creating a 70-90 mm usable travel window. It is a travel stop, not a lock, meaning it cannot hold the load without continuous air pressure.
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