Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S
The AirTAC SAIJ40X75-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. It provides a usable travel window of 45-75 mm, giving you 30 mm of flexibility to dial in the exact retract distance without swapping hardware. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This SKU is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and ships with a magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses a PT G1/4 port and relies on variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-30S Is Used
Machine Changeover
Dial in the 45-75 mm retract distance during product size changes without bolting on external stops or swapping the cylinder.
End-Position Tuning
Fine-tune the exact end of stroke at commissioning to perfect the seating pressure of a 40 mm bore actuator.
Variable End Stops
Adjust the travel window on the fly for diverter gates or sorting mechanisms that handle varying package sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30S the Right Cylinder?
Choose this 40 mm bore when an application requires around 628 N of thrust at 0.5 MPa; step down to a 32 mm bore (402 N push) for lighter duties, or up to a 50 mm bore (982 N push) if your payload demands more force. The adjustable stroke is ideal for product changeovers on a line, letting you shift the end stop by up to 30 mm rather than installing a fixed-stroke SAI cylinder. Remember that the rear adjuster and air cushions act only as travel stops and deceleration—they do not hold the load without live air. For dead-load holding, consider an external pilot-operated check valve or the SAIL/BSAI locking cylinders. To match this ISO 15552 interchangeable cylinder, specify: 40 mm bore, 75 mm stroke, 30 mm adjust, PT G1/4 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 SAIJ40BX75-30S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates 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 75 mm nominal stroke by up to 30 mm, creating a usable travel window of 45-75 mm. The adjuster acts as a mechanical stop to set the retract end position and does not lock the load without air pressure.
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