Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40 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 SAIJ40BX900-40
The AirTAC SAIJ40X900-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end-of-travel position. With a 900 mm nominal stroke and a 40 mm adjustment range, it provides an effective usable travel window of 860 to 900 mm. This enables precise positioning at commissioning without adding external stops. It delivers 879 N of pull force at 0.7 MPa.
Equipped with a SUS304 stainless steel rod, this version is well-suited for environments where corrosion resistance is a priority. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It operates at speeds of 30-800 mm/s and uses a PT G1/4 port. The rear adjuster acts purely as a travel stop for deceleration and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40 |
|---|---|
| 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 SAIJ40BX900-40
| 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 SAIJ40BX900-40 Is Used
Product Changeovers
Dial in the 860-900 mm travel window during format changes on packaging lines without physically replacing the actuator.
End-Stop Tuning
Fine-tune the retract position at machine commissioning to perfect seating against a workpiece, avoiding mechanical hard stops.
Extended Reach Sorting
Use the long 900 mm stroke to push varying product sizes across a conveyor, adjusting the retract distance as needed.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40 the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N push) for higher workloads, or down from a 50 mm bore (982 N push) if you want a more compact footprint. The adjustable stroke is ideal for product changeovers on a line, allowing you to dial back the travel by up to 40 mm instead of swapping cylinders. For load-holding without continuous air pressure, you would need a SAIL or BSAI variant, as the SAIJ adjuster is a stop, not a lock.
Because this cylinder features a 900 mm stroke, the 16 mm rod requires external guiding to prevent excessive side-loading on the seals. As a direct ISO 15552 replacement, verify your bore size, 900 mm stroke, 40 mm adjustment, PT G1/4 port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). No magnet is specified, so position sensing via CMSE or DMSE switches is not enabled out of the box.
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 SAIJ40BX900-40 FAQ
At 0.5 MPa it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm from the nominal 900 mm, giving a usable travel range of 860 to 900 mm. It functions as a mechanical stop to set the end position and does not lock the load.
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