Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75 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 SAIJ40BX185-75
The AirTAC SAIJ40X185-75 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 185 mm stroke that can be dialed back by up to 75 mm, creating a usable travel window of 110-185 mm for precise end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it fits medium-duty applications. This variant features a SUS304 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads.
The rear adjustment screw acts purely as a mechanical stop to trim the retract distance, meaning it does not hold the load without live air pressure. For position holding without continuous air, an external rod lock or related models like SAIL or BSAI are required. The extruded aluminum barrel includes sensor grooves on both sides for straightforward switch mounting.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75 |
|---|---|
| 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 SAIJ40BX185-75
| 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 SAIJ40BX185-75 Is Used
Machine Changeover
Dial in the retract position from 185 mm down to 110 mm instantly when switching to a shorter product format, eliminating the need to remount cylinders or add spacer blocks.
End-Stop Calibration
Fine-tune the final end position during commissioning to compensate for mechanical tolerances, ensuring precise placement without machining custom stoppers.
Variable Depth Operations
Adjust the travel distance on the fly for processes that require different stroke depths across mixed product batches on the same conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75 the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) for heavier payloads, or down from a 63 mm bore (1559 N) to save space and air volume. The 75 mm adjustment range is selected over a fixed-stroke SAI cylinder when a machine handles varying product sizes, allowing operators to fine-tune the retract end-stop without swapping hardware or adding external stops. When replacing an ISO 15552 cylinder, match the 40 mm bore, 185 mm stroke, PT G1/4 port, SUS304 rod material, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is under 300 mm, side-load stress on the 16 mm rod is moderate, though external guiding is still recommended for heavy off-center 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 SAIJ40BX185-75 FAQ
The rear adjuster screw lets you shorten the nominal 185 mm stroke by up to 75 mm, providing an effective travel range of 110-185 mm. The adjuster functions as a mechanical stop and does not lock the load without live air pressure.
At an operating pressure of 0.5 MPa, the SAIJ40X185-75 provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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