Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X425-75 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 SAIJ125X425-75
It features a 32mm carbon steel rod with an M27x2 thread and PT tapered ports. By incorporating a 75mm adjustment mechanism, this model creates a usable travel window between 350mm and 425mm, allowing precise end-position tuning without swapping out the entire unit.
This adjustable-stroke design is ideal for product changeovers, letting you dial in the exact retract distance during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this specific SKU is configured without a magnet. Remember that the rear screw acts purely as a travel stop and does not hold the load without continuous air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75 |
|---|---|
| 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 SAIJ125X425-75
| 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 SAIJ125X425-75 Is Used
Variable End-Stop Configuration
Dial in the retract distance from 350 to 425mm during machine commissioning to perfectly accommodate different product sizes without changing the cylinder.
Long-Stroke Positioning
Use the 425mm travel capacity for extending and retracting large material handling components, fine-tuning the final position via the rear stopper.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-75 the Right Cylinder?
The 75mm adjustment range is perfect for applications requiring variable end-stops or frequent machine setup modifications, eliminating the need to bolt on external stops or buy a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, ensure your parameters specify a 425mm stroke, 75mm adjustment, PT ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting styles.
Because the 425mm stroke is substantial, the 32mm rod will experience amplified side-loading forces if the load is unsupported. An external guide mechanism is highly recommended to prevent premature seal wear. Furthermore, if your application requires true load-holding without live air pressure, a standard SAIJ will not suffice; consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125X425-75 FAQ
At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 75mm, creating a usable travel window between 350mm and 425mm. It only decelerates and sets the travel end; it does not lock the load without live air pressure.
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Standard models are processed and dispatched in 3-5 business days.
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