Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20
The AirTAC SAIJ40X900-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, using a G1/4 port. The built-in rear stopper allows you to fine-tune the effective travel window from 880 to 900 mm without adding external physical stops to your machine frame.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. It shares the standard extruded aluminum barrel with sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting the FB, CA, CB, and CR foot and pivot styles.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAIJ40BX900-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SAIJ40BX900-20 Is Used
Machine Changeover
Dial in the 880 to 900 mm end-stop precisely during product size changes without swapping out the entire actuator or reworking the frame.
Material Handling
Pushes loads with 628N of force at 0.5 MPa, using the rear adjuster to compensate for slight mechanical drift in long-stroke conveyor routing.
Assembly Positioning
Leverage the SUS304 stainless steel rod for corrosion resistance while fine-tuning the final clamping position during assembly line commissioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20 the Right Cylinder?
Choose this 40mm bore when an application requires a 628N push force at 0.5 MPa, which sits neatly between the 402N of a 32mm bore and the 982N of a 50mm bore. The adjustable stroke is ideal for product changeovers or commissioning setups where the exact end-of-stroke position needs precise dialing-in. Because the 900mm stroke is substantial, an external guide is highly recommended to prevent excessive side-loading on the rod and thread.
Remember that the rear adjuster functions strictly as a travel stop, not a lock; it cannot hold a load without live air pressure. For true load-holding requirements without continuous air, consider the SAIL or BSAI series. This cylinder is dimensionally interchangeable with ISO 15552 cylinders and uses a PT port. No magnet is specified for this configuration, so CMSE or DMSE sensors cannot be used without modification.
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 SAIJ40BX900-20 FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.9 MPa, the push force increases to 1130N. The standard operational speed range is 30-800 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 900mm stroke by up to 20mm, creating a usable travel window of 880 to 900mm. It only sets the end position and deceleration; it does not lock the load without live air pressure.
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