Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75
The AirTAC SAIJ40X180-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 180 mm travel that can be dialed back by up to 75 mm, creating a usable window of 105-180 mm. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds between 30-800 mm/s.
This adjustable-stroke design allows precise end-position tuning during commissioning without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop and does not hold the load without live air pressure. It features sensor grooves on both sides of the extruded aluminum barrel for CMSE or DMSE switches, though this specific SKU is supplied without a magnet.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAIJ40BX180-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SAIJ40BX180-75 Is Used
Machine Changeover
Dial in the 105-180 mm travel window on the fly to accommodate different product lengths without changing the cylinder.
End-Position Tuning
Fine-tune the retract stop during commissioning to achieve exact positioning without adding external mechanical stops.
Variable Stops
Ideal for diverter gates on conveyors where the actuation distance needs periodic adjustment to handle varied package sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires a variable end-stop within a 105-180 mm travel range. If you need less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa, while stepping up to a 50 mm bore provides 982 N. The generous 75 mm adjustment window is ideal for product-size changeovers on a line. Because the nominal stroke is 180 mm, an external guide is not strictly required for side-load support, but always ensure the piston rod seal is not subjected to lateral stress.
For a direct ISO 15552 replacement match, verify the 40 mm bore, 180 mm nominal stroke, 75 mm adjustment code, PT tapered port thread, and SUS304 (code B) rod material. Note that SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. If your machine requires true load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the rear stopper.
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 SAIJ40BX180-75 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 stroke by up to 75 mm from the 180 mm nominal length, providing a usable travel range of 105-180 mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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