Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S
The AirTAC SAIJ125X90-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and a built-in magnet for position sensing. By turning the rear screw, you can trim the effective travel back by up to 20 mm, creating a precise 70-90 mm usable stroke window without adding external stops.
This adjustable-stroke design is ideal for fine-tuning end positions during machine commissioning or product changeovers. It retains the standard ISO 15552 mounting interface and operates at speeds of 30-500 mm/s. The cylinder uses PT tapered ports and includes variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125AX90-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125AX90-20S Is Used
End-Position Tuning
Dial in the exact 70-90 mm retraction point during machine setup to accommodate varying material thicknesses without swapping hardware.
Product Changeover
Quickly adjust the stroke window on packaging lines when switching to different product sizes, minimizing downtime.
Heavy Forming Stops
Leverage the 6136N push force for pressing applications while using the rear stopper to precisely set the forming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20S the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust—such as 6136N push at 0.5 MPa—exceeding the 3927N available from a 100 mm bore, but without stepping up to the 160 mm class. The adjustable 70-90 mm window is selected over a fixed-stroke SAI when the exact end-of-travel position needs on-the-fly tuning at commissioning. Because the rear adjuster acts only as a travel stop and the air cushion merely decelerates the load, neither will hold the payload without live air; for fail-safe load holding, consider a SAIL or BSAI cylinder. For a direct ISO 15552 replacement match, verify the 125 mm bore, 90 mm stroke, -20 adjustment, PT port thread, and the -S magnet requirement.
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 SAIJ125AX90-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 90 mm nominal stroke by up to 20 mm, providing a usable travel window of 70-90 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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