Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X425-75S 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S
The AirTAC SAIJ125X425-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 350 to 425 mm. The -S designation indicates an integrated magnet for use with CMSE reed and DMSE electronic sensors.
This model features a carbon steel rod and PT tapered port threads. Because the stroke extends to 425 mm, an external guide is recommended to manage side loading. The rear stopper allows you to fine-tune the end position during commissioning without swapping out the entire cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S |
|---|---|
| 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S
| 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 SAIJ125X425-75S Is Used
Product Size Changeover
Dial in the end position up to 75 mm during format changeovers on packaging lines without physically replacing the actuator.
Machine Setup Tuning
Fine-tune the 350-425 mm travel window during initial commissioning to achieve perfect mechanical alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75S the Right Cylinder?
If your setup needs less force, stepping down to a 100 mm bore provides 3927 N. The 75 mm adjustment range is ideal for production lines handling varying product sizes, allowing the end-stop to be dialed in on the fly instead of changing a fixed-stroke SAI cylinder.
For ISO 15552 replacement matching, ensure you specify the 125 mm bore, 425 mm stroke, 75 mm adjustment, PT port thread, and the -S magnet option. Mounting choices include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air. For load-holding requirements, consider an external rod lock or the SAIL series.
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 SAIJ125X425-75S FAQ
At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 425 mm down to 350 mm. It is a travel stop, not a lock, and requires live air to hold the load.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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