Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20
The AirTAC SAIJ125X20-20 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 PT tapered ports. Because the nominal 20mm stroke can be dialed back by up to 20mm, operators gain a usable 0-20mm travel window for exacting end-position tuning.
This adjustable stopper allows you to fine-tune the retract position during commissioning without swapping the cylinder or adding external stops. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125AX20-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAIJ125AX20-20 Is Used
Precision Clamping Setup
Dial in the exact 0-20mm clamping depth during machine commissioning to accommodate varying material thicknesses without external stops.
Product Line Changeover
Rapidly adjust the retract end-position by up to 20mm when switching the manufacturing line to a new product size or format.
Heavy Forming End-Stop
Leverage the 6136N thrust capacity and fine-tune the stroke limit to prevent over-travel in high-force pressing and forming operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX20-20 the Right Cylinder?
Choose this 125mm bore when a smaller 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust for heavy clamping. The adjustable 0-20mm travel window is perfect for applications requiring variable end-stops or frequent product-size changeovers. For load-holding without continuous air pressure, integrate an external rod lock or select an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 replacement exactly, specify the 125mm bore, 20mm stroke, 20mm adjustment, PT ports, SUS420J2 rod, and no magnet.
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 SAIJ125AX20-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to trim the effective travel back from the 20mm nominal stroke, creating a 0-20mm usable window. It acts as a physical stop to set the end position and is not a locking mechanism.
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