Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75
The AirTAC SAIJ125X210-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. By turning the rear stopper screw, you can trim the forward travel by up to 75mm, creating a precise 135-210mm usable stroke window without changing the cylinder body. This feature is ideal for product changeovers on packaging lines where end positions vary.
This 125mm bore unit features a robust 32mm carbon steel rod and an M27x2 thread, paired with PT tapered port threads for secure pneumatic connections. It retains the standard extruded aluminum barrel with dual sensor grooves, though position detection requires adding a magnet (-S) to work with CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125 Adjustable Cylinder SAIJ125X210-75 Is Used
Product Changeovers
Quickly dial in the 135-210mm stroke window when switching between different carton or package sizes on a packaging line without swapping hardware.
Machine Setup
Fine-tune the end-of-stroke position during initial commissioning to perfect pressing or forming forces without adding external mechanical stops.
Variable End Stops
Provide adjustable physical limits for heavy-duty actuators in automated assembly equipment where the exact travel distance varies per production run.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75 the Right Cylinder?
Choose this adjustable model over a fixed SAI cylinder when your application requires frequent end-position tuning during commissioning or when accommodating multiple product sizes on the same line. If your setup needs less thrust, stepping down to a 100mm bore yields 3927N at 0.5MPa; if more force is required, a 160mm bore provides 10053N. When ordering an ISO 15552 replacement, match the 125mm bore, 210mm nominal stroke, 75mm adjustment range, PT port thread, and mounting style.
Because the nominal stroke is 210mm, ensure adequate external guiding to prevent excessive side-loading on the 32mm rod. Remember that the rear adjuster functions strictly as a travel stop, not a locking device; the cylinder cannot hold a load without live air pressure. For true load-holding, consider an external rod lock or the SAIL pneumatic lock series.
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 SAIJ125 Adjustable Cylinder SAIJ125X210-75 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the effective stroke by up to 75mm. This creates a usable travel window of 135-210mm from the nominal 210mm stroke, which can be fine-tuned during machine setup.
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