Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20S 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 SAIJ40BX900-20S
The AirTAC SAIJ40X900-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel back by up to 20 mm. This yields a usable end-position window of 880 to 900 mm, allowing precise fine-tuning at commissioning without adding external stops. It delivers 628 N of push and 528 N of pull force at 0.5 MPa, operating at speeds of 30-800 mm/s.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and ships with a magnetic piston for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, accepting AirTAC CMSE reed and DMSE solid-state switches. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20S |
|---|---|
| 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 SAIJ40BX900-20S
| 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 SAIJ40BX900-20S Is Used
Machine Setup & Changeover
Dial in the exact 880-900 mm end-stop during product size changeovers without physically swapping the cylinder or re-engineering the fixture.
Variable End-Position Stops
Fine-tune the retract distance on a long-stroke conveyor sorting arm to accommodate different package lengths on the fly.
Long-Stroke Assembly Tuning
Trim the final 20 mm of travel to perfectly seat a component without generating hard mechanical crashes at the end of the 900 mm stroke.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-20S the Right Cylinder?
Choose this 40 mm bore when an application requires the 528 N pull force at 0.5 MPa, stepping up from a 32 mm bore (345 N pull) for heavier loads, or down from a 63 mm bore (1402 N pull) to save space. The adjustable stroke is selected over a fixed SAI when a machine setup requires variable end-stops for product changeovers. Remember that the rear adjuster acts only as a travel stop, not a lock; a plain SAIJ cannot hold a load without live air, so for fail-safe load holding, specify an SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 900 mm stroke, 20 mm adjustment, PT tapered port threads, and the -S magnet. Because the 900 mm stroke is long and unsupported, an external guide rail is recommended to prevent excessive side-loading on the 16 mm rod and M12x1.25 thread.
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 SAIJ40BX900-20S 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 rear adjuster screw shortens the 900 mm nominal stroke by up to 20 mm, creating an adjustable travel window between 880 and 900 mm for precise end-position tuning.
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