Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20
The AirTAC SAIJ40X185-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits a usable travel window of 165 to 185 mm. Delivering 628 N of push force at 0.5 MPa, it is equipped with a G1/4 port and a 16 mm piston rod. The barrel is extruded aluminum with sensor grooves on both sides, and this specific configuration uses a SUS304 stainless steel rod for enhanced corrosion resistance.
The integrated rear stopper screw allows you to fine-tune the retract end position at commissioning without adding external stops or swapping the cylinder. Note that this adjuster acts purely as a travel stop and does not hold the load without live air pressure. For applications requiring position holding without continuous air, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 185 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 SAIJ40BX185-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SAIJ40BX185-20 Is Used
End-Position Tuning
Dial in the exact retract distance within the 165-185 mm window during machine commissioning without machining custom spacers.
Product Changeover
Quickly adapt the stroke for different package sizes on a conveyor line by turning the rear adjuster screw.
Corrosive Environments
Leverage the SUS304 stainless steel rod for pneumatic tasks in food processing or light chemical areas requiring washdown.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) lacks the required thrust, but a 50 mm bore (982 N) would be physical overkill. The adjustable 165-185 mm travel is ideal for product changeovers on a packaging line, letting you dial in the exact end position on the fly instead of maintaining a stock of fixed-stroke SAI cylinders. As an ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO mounting interfaces. To match this exact configuration, select a 40 mm bore, 185 mm stroke, 20 mm adjustment, PT tapered port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and a SUS304 (B) rod material. Because the stroke is under 300 mm, side-load risks are moderate, but an external guide is still recommended for heavy lateral loads.
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 SAIJ40BX185-20 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 165 to 185 mm. It acts as a mechanical stop to fine-tune the end position and is not a lock that holds the load without air pressure.
At 0.5 MPa operating pressure, the SAIJ40X185-20 generates 628 N of push force and 528 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 128 kgf.
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