Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75S 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 SAIJ40BX900-75S
The AirTAC SAIJ40X900-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 825-900 mm from its 900 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for use with CMSE reed and DMSE electronic sensors.
The rear adjustment screw allows you to fine-tune the end position at commissioning without adding external stops. It acts purely as a travel stop and does not hold the load without live air. It uses a PT tapered port thread and supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75S |
|---|---|
| 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 SAIJ40BX900-75S
| 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 SAIJ40BX900-75S Is Used
Variable End-Stop Tuning
Dial in the exact 825 to 900 mm travel needed for precision assembly tasks without swapping out the entire cylinder body.
Machine Changeover
Quickly adjust the retract end-position during product size changes on a packaging line to minimize downtime.
Corrosive Test Environments
The SUS304 stainless steel rod withstands exposure to moisture and chemicals in testing chambers while providing stable movement.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX900-75S the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (402 N at 0.5 MPa) but less bulk than a 50 mm model (982 N). An adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, unlike a fixed-stroke SAI cylinder. Because the nominal stroke is 900 mm, an external guide is highly recommended to manage side loads on the long unsupported piston rod.
For load-holding without continuous air pressure, this cylinder is insufficient as the rear adjuster is only a stop. You would need to specify an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock. To match this ISO 15552 interchangeable cylinder, use a 40 mm bore, 900 mm stroke, 75 mm adjustment, PT port, SUS304 rod, and -S magnet.
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 SAIJ40BX900-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder 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 allows you to shorten the effective travel by up to 75 mm, creating a usable stroke window of 825 to 900 mm. It functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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