Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S
The AirTAC SAIJ125X145-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the nominal 145 mm travel by up to 40 mm. This yields a precise 105-145 mm usable stroke window, perfect for accommodating varied product sizes on a single line without physically swapping the actuator. It features a carbon steel piston rod and a -S magnet for use with CMSE reed and DMSE electronic sensors.
Delivering substantial thrust, this 125 mm bore unit generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and uses PT tapered G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125X145-40S Is Used
Variable End-Stop Forming
Dial in the exact 105-145 mm forming depth during setup or material changes without adding external stopper blocks to the machine frame.
Multi-Product Changeover
Quickly adapt the retract distance on packaging lines handling different carton sizes by adjusting the rear screw during product transitions.
Sensor-Ready Positioning
Leverage the built-in magnet with DMSE solid-state sensors to track the adjusted travel end while managing heavy 6136 N loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40S the Right Cylinder?
Select this 125 mm bore when an application requires heavy thrust—6136 N push at 0.5 MPa—surpassing the 3927 N capacity of the 100 mm version, but without stepping up to the massive 160 mm frame. The integrated rear adjuster is chosen over a fixed-stroke SAI when commissioning requires fine end-position tuning or frequent machine changeovers, acting as a mechanical stop to set the retract distance precisely.
Because the stroke is 145 mm, side-load risks are moderate, but an external guide remains advisable for heavy lateral loads. Remember that the rear adjuster and air cushions only decelerate the stroke; they do not hold the load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series. This configuration is dimensionally interchangeable per ISO 15552 standards.
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 SAIJ125X145-40S FAQ
The rear adjuster acts as a mechanical stop that shortens the effective stroke by up to 40 mm. This gives the 145 mm nominal stroke a usable travel window of 105-145 mm, allowing fine-tuning of the end position at commissioning without replacing the cylinder.
At a 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers a maximum push force of 11045 N.
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