Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20
The AirTAC SAIJ125X700-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 680 to 700 mm. Delivering a robust 1402 N pull force at 0.5 MPa, it handles heavy-duty positioning tasks with precision. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This variant features an SUS420J2 stainless steel piston rod (material code A) for enhanced corrosion resistance. The rear adjustment screw acts purely as a travel stop to fine-tune the retract end position during commissioning; it is not a locking mechanism, so live air pressure is required to hold the load. Air consumption is managed via PT tapered port threads (G1/2) and variable air cushions at both ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125AX700-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125AX700-20 Is Used
Machine Changeover
Dial in the exact 680 to 700 mm end position during product size changeovers without replacing the cylinder or adding external stopper blocks.
Material Handling
Provides the heavy 1402 N pull force needed to retract heavy conveyor diverters or sorting gates over a precisely tuned travel distance.
Assembly Line Setup
Fine-tune the retract stroke during initial commissioning to compensate for mechanical tolerance stack-ups in large automated fixtures.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 5497 N push at 0.7 MPa) lacks the necessary thrust for your application, but a 160 mm bore would be excessive. The 20 mm adjustment range is ideal for product changeovers, allowing you to shorten the effective stroke without swapping the cylinder or adding external stops.
For any stroke length of 700 mm, the 32 mm diameter rod carries significant side-load capacity, though an external guide is still recommended for unsupported loads. If your application requires true load-holding without continuous air pressure, consider the AirTAC SAIL or BSAI series instead of relying on the SAIJ adjuster. This model is dimensionally interchangeable with other ISO 15552 profile cylinders.
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 SAIJ125AX700-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 1402 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 680 to 700 mm. The adjuster acts as a mechanical stop for end-position tuning and does not lock the load without live air.
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