Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 230mm 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
- Stroke230 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S
The AirTAC SAIJ125X230-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a 210 to 230 mm usable travel window, allowing you to dial back the nominal 230 mm stroke by up to 20 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it is built with a SUS420J2 stainless steel rod and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches.
This adjustable model uses a reduced set of ISO 15552 mounting interfaces (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR options. The rear adjuster acts purely as a travel stop to fine-tune the retract end position without adding external stops; it is not a locking device and will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 230 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 SAIJ125AX230-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×230 | 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 SAIJ125AX230-20S Is Used
Product Changeover Tuning
Quickly adjust the retract end position by up to 20 mm when switching product sizes on a conveyor line, eliminating the need to physically swap out cylinders for different packaging lengths.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy machining fixtures, using the rear stopper to precisely set the 210-230 mm travel window during initial machine commissioning.
Automated Assembly Stops
Set variable end-stops for large component assembly presses, relying on the PT tapered ports and SUS420J2 stainless steel rod for durable, leak-free operation in industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX230-20S the Right Cylinder?
Choose this 125 mm bore when your application requires more force than the 80 mm class (2513 N at 0.5 MPa) but less than the 160 mm class (10053 N at 0.5 MPa). The adjustable stroke is ideal for product changeovers on a line, letting you fine-tune the end position by up to 20 mm without physically swapping the cylinder. Because the 230 mm stroke exceeds the 300 mm threshold, ensure you use an external guide to support the load and mitigate side-load stress on the 32 mm rod.
If your machine setup requires holding a load without continuous compressed air, a plain SAIJ cylinder will not suffice since the rear adjuster only sets travel limits. In those cases, consider the SAIL air-released lock or BSAI clamp-lock cylinder. For a direct ISO 15552 replacement, match the 125 mm bore, 230 mm stroke, 20 mm adjustment, PT port thread, SUS420J2 rod material, 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 SAIJ125AX230-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to mechanically shorten the effective travel from the 230 mm nominal stroke down to 210 mm. This creates a 20 mm tuning window for precise end-position setup without needing external stops.
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