Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40
The AirTAC SAIJ125X150-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 110-150 mm usable travel window from its 150 mm nominal stroke. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This unit features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and carries a PT tapered port thread. The rear adjuster acts purely as a travel stop to fine-tune end positions at commissioning; it does not hold the load dynamically without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125AX150-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125AX150-40 Is Used
Machine Changeover
Dial in the 110-150 mm travel window during product size transitions to set precise end positions without physically swapping out the actuator.
Heavy Press Assembly
Leverage the 6136 N push force at 0.5 MPa to seat bearings or form components, using the rear stop to tune the final press depth.
Variable End Stops
Fine-tune the retract position on packaging lines, using the 40 mm adjustment window to compensate for mechanical wear over time.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-40 the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short—stepping up from the 80 mm bore (which provides 2513 N push at 0.5 MPa) gives your fixture the heavy thrust needed to overcome high friction. The 40 mm adjustment range is ideal for product changeovers, allowing you to dial in the exact end-of-stroke position without swapping the cylinder or adding external stops. For true load-holding without continuous air, consider the SAIL or BSAI series instead.
When matching ISO 15552 dimensions for a replacement, verify the 150 mm stroke, 40 mm adjustment, PT G3/8 port, and your required mounting style. The SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. For any stroke of 150 mm or more, ensure your setup includes an external guide to prevent side-load damage to the 32 mm rod.
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 SAIJ125AX150-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from 150 mm down to 110 mm. It allows precise end-position tuning during commissioning but does not lock the load without live air pressure.
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