Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S
The AirTAC SAIJ125X350-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 330-350 mm. It delivers 6136 N of pull force at 0.5 MPa and features a robust 32 mm SUS420J2 stainless steel piston rod. The integrated -S magnet supports electronic DMSE and reed CMSE position sensing.
This adjustable-stroke design allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It features PT tapered G1/2 ports and extruded aluminum dual sensor grooves. The rear adjuster acts as a travel stop to fine-tune deceleration, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-20S Is Used
Variable End-Stop Forming
Dial in the 330-350 mm travel window on heavy metal forming presses, accommodating different blank sizes without retooling the entire fixture.
Machine Changeover Setup
Fine-tune the retract end-position during product family changeovers, using the rear stopper to quickly set precise bottoming distances.
Heavy Material Handling
Leverage the 6136 N pull force to index large pallets or heavy components, adjusting the stroke by up to 20 mm to clear obstructions on the line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-20S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy thrust combined with on-the-fly stroke trimming. If you need less force, stepping down to an 80 mm bore yields 2268 N of pull at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425 N. The adjustable rear screw is ideal for product-size changeovers, offering variable end-stops that a fixed-stroke SAI cylinder cannot match.
For load-holding without continuous air pressure, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the SAIJ adjuster is strictly a stop. Because this 350 mm stroke is substantial, the 32 mm rod and M27x2 thread handle high side-loads, but an external guide rail is still recommended for unsupported loads. Ensure your ISO 15552 replacement matches the 125 mm bore, 350 mm stroke, 20 mm adjust, PT G1/2 ports, and -S 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 SAIJ125AX350-20S FAQ
The rear adjuster acts as an external stopper that lets you trim the effective travel back by up to 20 mm, creating a 330-350 mm usable window. It sets the end-position and deceleration but does not lock the load without live air pressure.
At 0.5 MPa it provides 6136 N of pull force and 8590 N of push force. It operates at speeds of 30-500 mm/s and uses a G1/2 PT port for air supply.
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