Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30 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 SAIJ40BX75-30
The AirTAC SAIJ40X75-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 30 mm. This creates a usable 45-75 mm stroke window, giving you precise control over the retract end position without swapping out the barrel or adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, fitting perfectly into mid-range pneumatic setups.
Built with a SUS304 stainless steel rod, this cylinder handles exposure to moisture or washdowns far better than standard carbon steel. It uses a PT tapered port thread for a tight, reliable seal and operates at speeds between 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, ready for AirTAC CMSE reed or DMSE electronic switches if you decide to add position sensing later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30 |
|---|---|
| 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 SAIJ40BX75-30
| 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 SAIJ40BX75-30 Is Used
End-Stop Calibration
Dial in the exact retract position within the 45-75 mm window during machine commissioning to achieve perfect alignment without shimming.
Product Changeover
Quickly adapt the stroke length on a packaging conveyor when handling different carton sizes, using the 30 mm trim to match new formats.
Test Fixture Positioning
Fine-tune the clamping distance on a pneumatic test station, leveraging the SUS304 rod for corrosion resistance in varied environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-30 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (offering 402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N push) would be excessive overkill. The 30 mm adjustment range is particularly useful on packaging lines or test fixtures where you need to dial in the exact end position during commissioning or product changeover, rather than relying on a fixed 75 mm stroke SAI cylinder.
Remember that the rear adjuster acts only as a mechanical stop to set the travel end and does not hold the load without live air pressure. If your application requires true fail-safe load holding, you should look at the SAIL air-released lock or BSAI clamp-lock series instead. This model supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX75-30 FAQ
It features a rear adjusting screw that lets you shorten the nominal 75 mm stroke by up to 30 mm, providing a usable travel window of 45-75 mm. This allows you to set the exact retract position mechanically without changing the cylinder or adding external stops.
At a standard 0.5 MPa operating pressure, the SAIJ40X75-30 delivers 628 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
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