Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S
The AirTAC SAIJ125X375-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. Its 375 mm nominal stroke can be dialed back by up to 20 mm, creating a precise 355-375 mm usable travel window for fine-tuning end positions during commissioning. This made-to-order configuration features a SUS420J2 stainless steel rod for enhanced corrosion resistance and includes a magnet for position sensing.
Because the stroke exceeds standard increments, it is manufactured to exact specifications while retaining the standard ISO 15552 mounting interface. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing direct mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical stop to set the retract position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125AX375-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125AX375-20S Is Used
Variable End-Stop Machining
Dial in the 355-375 mm retract position precisely during machine setup to accommodate different part lengths without changing out the entire actuator.
Product Size Changeovers
Quickly adjust the stroke window on packaging lines when transitioning between different box sizes, using the rear screw to set the new stopping point.
Heavy Fixture Positioning
Leverage the 6136 N push force to move heavy welding fixtures into place, relying on the 32 mm rod to withstand demanding industrial loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for moving heavy actuators, but a 160 mm bore (10053 N) would be physically oversized. The adjustable 355-375 mm window is ideal for product changeovers on a line, allowing you to shift the end-stop without swapping the cylinder or adding external stops. For any application using a 375 mm stroke, the 32 mm rod diameter handles significant loads, but an external guide is recommended to prevent excessive side-loading on long unsupported travels.
To match this exact ISO 15552 interchangeable replacement, specify: 125 mm bore, 375 mm stroke, 20 mm adjustment, PT tapered ports, and the -S magnet option. If your process requires holding the load statically without continuous air pressure, note that the SAIJ adjuster is a stop and not a lock; you should instead select an AirTAC SAIL pneumatic lock cylinder or an external rod lock.
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 SAIJ125AX375-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear mechanical stopper allows you to shorten the 375 mm nominal stroke by up to 20 mm, providing a usable travel window of 355 to 375 mm. This enables fine-tuning of the end position at commissioning without adding external stops.
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