Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S
The AirTAC SAIJ125X400-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 350-400mm usable travel window. Delivering 6136N of push force at 0.5 MPa, it handles heavy loads while allowing precise end-position tuning during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This variant uses a SUS420J2 stainless steel rod for improved corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The PT tapered port threads ensure a tight pneumatic seal, and the rear stopper lets you dial in the exact retract distance without adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125AX400-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125AX400-50S Is Used
Product Changeover
Dial in the 350-400mm travel window quickly during production line format changes without swapping out the entire actuator.
Heavy Press Fitting
Leverage the 6136N push force to seat large components while fine-tuning the exact bottoming position via the rear screw.
Variable End Stops
Adjust the retract distance on the fly for machinery processing different material lengths within the 50mm adjustment range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-50S the Right Cylinder?
Choose this 125mm bore when you need substantial thrust, such as the 6136N push force at 0.5 MPa, but require the flexibility to trim the retract distance by up to 50mm. If your application requires less force, stepping down to a 100mm bore yields 3927N push force. If you need load-holding without live air pressure, note that this rear adjuster acts only as a travel stop and not a brake; consider an external rod lock or the SAIL lock variant instead.
Because this model has a 400mm stroke, the 32mm rod diameter should be paired with an external guide to prevent excessive side-loading on the piston. This SAIJ cylinder accepts Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting the FB, CA, CB, and CR options. It is dimensionally interchangeable per ISO 15552.
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 SAIJ125AX400-50S FAQ
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke from the 400mm nominal length down to 350mm. This stop only sets the travel end and does not hold the load without live air pressure.
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