Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S
The AirTAC SAIJ125X300-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 280 to 300 mm, allowing you to dial back the nominal stroke by up to 20 mm during commissioning. Delivering 8590 N of push force at 0.7 MPa, it is built with a SUS420J2 stainless steel rod and includes a magnet for CMSE reed and DMSE electronic sensors.
This adjustable-stroke design eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-20S Is Used
Machine Changeover Tuning
Dial in the exact retract distance within the 280-300 mm window during product size changeovers without physically swapping the actuator.
Variable End-Stop Positioning
Fine-tune the final end position during machine commissioning to accommodate varying material thicknesses or tooling offsets.
Heavy-Duty Assembly Press
Leverage the 8590 N push force at 0.7 MPa for pressing operations while retaining the flexibility to adjust the travel limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20S the Right Cylinder?
Selecting the SAIJ125X300-20-S is ideal when your machine requires precise end-position tuning on a 300 mm stroke. If you need less force, stepping down to a 100 mm bore yields 5497 N of push at 0.7 MPa. If your application requires load-holding without continuous air pressure, consider the SAIL air-released lock or BSAI clamp-lock cylinders instead of relying on the rear stopper.
Because the 300 mm stroke is relatively long, the 32 mm rod diameter and M27x2 rod thread provide robust support, but an external guide is recommended to manage side loads. This cylinder uses PT tapered ports and is dimensionally interchangeable per ISO 15552. To match this configuration, specify the 125 mm bore, 300 mm stroke, 20 mm adjustment, PT port, SUS420J2 rod, and the -S magnet option.
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 SAIJ125AX300-20S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates a push force of 8590 N and a pull force of 5734 N. The maximum push force is 11045 N at 0.9 MPa.
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 280 to 300 mm. It only sets the travel end and does not lock or hold the load without live air pressure.
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