Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40 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 SAIJ125AX425-40
The AirTAC SAIJ125X425-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 425 mm nominal stroke that can be dialed back by up to 40 mm, yielding a precise 385 to 425 mm usable travel window for exact end-position tuning during commissioning. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it suitable for moving heavy industrial loads.
This variant features a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is not equipped with a magnet for position sensing. The rear adjuster acts purely as a mechanical stop to set the retract end, and it cannot hold the load without live air pressure. For true load-holding without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40 |
|---|---|
| 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 SAIJ125AX425-40
| 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 SAIJ125AX425-40 Is Used
Machine Setup & Changeover
Fine-tune the 385 to 425 mm retract end-stop during product size changeovers without swapping out the entire cylinder or adding external mechanical stops.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or push heavy workpieces, using the rear adjuster to dial in the exact ejection distance.
Variable End-Stop Positioning
Dial back the travel by up to 40 mm to accommodate different material thicknesses or varying package sizes on the same production line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-40 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires high thrust (6136 N push at 0.5 MPa) and on-the-fly end-position adjustments without adding external stops. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force. Because the 425 mm stroke is substantial and the 32 mm rod is subjected to high loads, an external guide is strongly recommended to prevent excessive side-loading and premature wear.
The adjustable stroke is ideal for product changeovers on a line, allowing you to fine-tune the retract distance quickly. This SAIJ model uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. When replacing an ISO 15552 cylinder, match the 125 mm bore, 425 mm stroke, 40 mm adjustment, PT G1/2 port, and the specific mounting setup.
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 SAIJ125AX425-40 FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear-mounted adjuster acts as a mechanical stop that lets you shorten the 425 mm nominal stroke by up to 40 mm, providing a usable travel window of 385 to 425 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
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