Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S
The AirTAC SAIJ125X425-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 385 to 425 mm, allowing you to dial in the exact retract position without swapping physical components. It delivers 6136 N of push force at 0.5 MPa, making it ideal for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod for superior corrosion resistance and a magnet for CMSE or DMSE sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the rear stopper screw sets the end position without acting as a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-40S Is Used
Machine Changeover
Dial in the retract position by up to 40 mm during product size changes without physically swapping the cylinder or adding external stop blocks.
Heavy Assembly Press
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the adjustable end-stop to fine-tune the pressing depth.
Long-Stroke Positioning
Move large pallets over a 425 mm span while relying on the integrated SUS420J2 rod to withstand harsh industrial environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40S the Right Cylinder?
Select this adjustable model over a fixed-stroke SAI when your application requires frequent product changeovers or precise end-position tuning during machine commissioning. To match it for ISO 15552 replacement, verify the 125 mm bore, 425 mm stroke, 40 mm adjustment, PT ports, and the -S magnet. If you need to step down force, a 100 mm bore yields 3927 N at 0.5 MPa.
Because the stroke is 425 mm, an external guide is strongly recommended to prevent side-loading damage to the 32 mm rod. Remember that the rear adjuster only acts as a travel stop; it cannot hold a load without live air. For true load-holding without air pressure, consider an external rod lock or pilot-operated check valve.
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 SAIJ125AX425-40S FAQ
The rear adjuster screw lets you shorten the nominal 425 mm stroke by up to 40 mm, providing a usable travel window of 385 to 425 mm. It acts purely as a mechanical stop and does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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