Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 80mm 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
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S
The AirTAC SAIJ125X80-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push and 5734N pull force at 0.5 MPa, making it suitable for heavy-duty positioning. By turning the external rear screw, you can shorten the nominal 80mm travel by up to 40mm, creating a precise 40-80mm usable stroke window for on-the-fly end-position tuning.
This SKU is configured with a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and includes a magnet for position sensing. It pairs seamlessly with AirTAC CMSE reed and DMSE solid-state switches fitted into the dual-side sensor grooves on the extruded aluminum barrel. The rear adjuster acts purely as a travel stop to set deceleration endpoints; it does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAIJ125AX80-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SAIJ125AX80-40S Is Used
Variable End-Stop Setup
Dial in the exact 40-80mm travel window during machine commissioning to accommodate varying material thicknesses without changing the cylinder.
Product Line Changeover
Quickly adjust the retract position by up to 40mm when switching the production line to a new package size, minimizing downtime.
Heavy-Duty Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the rear stopper to fine-tune the final resting coordinate.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX80-40S the Right Cylinder?
Choose this 125mm bore when your application requires over 5700N of pull force at 0.5 MPa, stepping up significantly from the 80mm bore which provides 2268N. The adjustable 40-80mm travel window is ideal for machine setups requiring variable end-stops during product changeovers, eliminating the need to swap cylinders or add external stops. For load-holding without continuous air pressure, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder, as the SAIJ adjuster is not a brake.
When replacing an ISO 15552 cylinder, match these exact parameters: 125mm bore, 80mm nominal stroke, 40mm adjustment range, PT tapered port threads, and a magnet (-S) for electronic or reed sensors. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX80-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. At the maximum pressure of 1.0 MPa, it achieves a push force of 1251 kgf.
The rear adjuster screw allows you to trim the effective stroke back by up to 40mm from the 80mm nominal length, providing a usable travel window of 40-80mm. This stopper only sets the end position and does not hold the load mechanically without live air pressure.
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