Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-50S 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 SAIJ40BX180-50S
The AirTAC SAIJ40X180-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 130-180 mm from its 180 mm nominal stroke. It delivers 879 N of push force at 0.7 MPa and pulls 528 N at 0.5 MPa. The piston rod is SUS304 stainless steel (code B), and the body features an extruded aluminum barrel with sensor grooves on both sides.
This model includes a magnetic piston (-S) for position detection with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to fine-tune end positions during commissioning without adding external stops; it does not hold the load without live air pressure. Porting is PT tapered thread (G1/4), and the mounting interface is dimensionally interchangeable with ISO 15552 cylinders.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-50S |
|---|---|
| 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 SAIJ40BX180-50S
| 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 SAIJ40BX180-50S Is Used
Machine Changeover
Dial in the retract stop from 130 to 180 mm to accommodate different product lengths on a packaging line without changing cylinder hardware.
Variable End Stops
Set precise ejection positions for varying package sizes on a conveyor belt, using the rear screw to trim the stroke exactly as needed.
Commissioning Fine-Tune
Eliminate mechanical shimming during machine setup by adjusting the rear stopper to perfectly time the 879 N push motion.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-50S the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning on the fly, such as accommodating product size changes on a conveyor without physically swapping the cylinder. If your machine needs less force, stepping down to a 32 mm bore yields 563 N of push force at 0.7 MPa. If you need more power, a 50 mm bore provides 1374 N.
The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. For load-holding without continuous air pressure, select a related type like SAIL or BSAI instead of relying on the rear stopper. To match this ISO 15552 replacement exactly, specify a 40 mm bore, 180 mm stroke, 50 mm adjustment, PT port, and a magnetic piston.
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 SAIJ40BX180-50S FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm, creating a usable travel window of 130-180 mm. It functions as a mechanical stop to fine-tune the end position and does not lock or hold the load without live air pressure.
At an operating pressure of 0.7 MPa, the SAIJ40X180-50-S provides 879 N of push force and 724 N of pull force. At 0.5 MPa, it delivers 628 N of push force.
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