Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40S 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 SAIJ40BX900-40S
The AirTAC SAIJ40X900-40-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, allowing you to dial back the nominal 900 mm stroke by up to 40 mm. This creates an effective 860-900 mm usable travel window for fine-tuning the retract end position at commissioning. It delivers a solid 879 N push force at 0.7 MPa, fitting firmly into the mid-range thrust class.
This unit features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40S |
|---|---|
| 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 SAIJ40BX900-40S
| 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 SAIJ40BX900-40S Is Used
Machine Changeover
Dial in the exact 860-900 mm retract position during product size changes without machining new hard stops.
Variable End-Stop
Adjust the travel end-point on the fly for automated material push-off stations requiring flexibility.
Commissioning Tuning
Fine-tune the final retract position during machine setup to align tooling perfectly before locking the jam nut.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-40S the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when your machine setup requires variable end-stops or precise product changeover tuning without swapping the physical cylinder. If you need higher force, stepping up to the 50 mm bore yields 1374 N at 0.5 MPa, while dropping to a 32 mm bore reduces thrust to 402 N. This SAIJ40X900-40-S is dimensionally interchangeable per ISO 15552 and configured with a PT tapered port, SUS304 rod, and a -S magnet.
Because the 900 mm stroke is long, the 16 mm rod and M12x1.25 thread still require external guide support to handle side loads and prevent rod bending over extended travel. For applications requiring true load-holding without live pressure, consider the SAIL or BSAI locking cylinders, as this standard SAIJ adjuster is not a brake.
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 SAIJ40BX900-40S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. At 0.5 MPa, it provides 628 N push and 528 N pull.
The rear adjuster screw lets you shorten the effective travel from the nominal 900 mm down to 860 mm. This gives a 40 mm tuning window to set the exact retract end position without adding external stops.
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