Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75S 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 SAIJ40BX180-75S
The AirTAC SAIJ40X180-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 180 mm travel that can be fine-tuned down by up to 75 mm, yielding a highly flexible 105-180 mm usable stroke window. Delivering 628 N of push force at 0.5 MPa, it fits mid-range automation tasks perfectly.
This configuration features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE and DMSE sensors. The PT tapered port threads match the standard G1/4 fitting size. Because the rear adjuster acts strictly as a mechanical stop and does not lock the load, you must maintain live air pressure to hold a position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75S |
|---|---|
| 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 SAIJ40BX180-75S
| 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 SAIJ40BX180-75S Is Used
Product Changeovers
Dial in the 105-180 mm stroke window during format changes on packaging lines without physically replacing the cylinder.
Machine Commissioning
Fine-tune the retract end-position precisely during setup to avoid costly mechanical hard-stops or redesigns.
Variable End Stops
Adjust the effective stroke on the fly for testing different material lengths in light assembly operations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-75S the Right Cylinder?
Choose this 40 mm bore when you need more thrust than a 32 mm bore (402 N push at 0.5 MPa) but want a smaller footprint than a 50 mm bore (982 N push). The generous 75 mm adjustment range is perfect for product changeovers, allowing you to dial in the exact end-of-stroke position without adding external stops or swapping out a fixed-stroke SAI cylinder. To replicate this ISO 15552 cylinder, specify: 40 mm bore, 180 mm stroke, 75 mm adjust, PT ports, SUS304 (B) rod, and the -S magnet.
With a 180 mm stroke, the 16 mm diameter rod handles normal loads well, but you should always verify that your payload is guided externally to prevent excessive side-loading. For applications requiring the load to be held mechanically without continuous air pressure, consider the AirTAC SAIL or BSAI series instead.
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 SAIJ40BX180-75S 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 lets you shorten the 180 mm nominal stroke by up to 75 mm, creating a usable travel window of 105 to 180 mm. It acts as a mechanical stop to set the position, but it does not lock the load without live air pressure.
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