Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20 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 SAIJ125AX425-20
The AirTAC SAIJ125X425-20 is a double-acting, single-rod 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 20 mm, creating a precise 405-425 mm usable travel window for exact end-position tuning during commissioning. Driven by a G1/2 port and a robust 32 mm rod, it delivers 8590 N of push force at 0.7 MPa, making it ideal for heavy-duty manipulation.
This variant features an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes adjustable air cushions at both ends to absorb kinetic energy. The extruded aluminum barrel integrates dual sensor grooves, supporting CMSE reed and DMSE electronic solid-state switches if a magnet is added later. It utilizes a reduced mounting set—Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20 |
|---|---|
| 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 SAIJ125AX425-20
| 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 SAIJ125AX425-20 Is Used
Heavy Machining Positioning
Dial in the 405-425 mm travel window to set precise machining boundaries on heavy fixtures, allowing rapid recalibration when raw material dimensions vary.
Automated Assembly Changeover
Quickly modify the retract end-position during product family transitions without disassembling the line, using the 20 mm adjustment range to accommodate new part heights.
Large Press Feeding
Leverage the 8590 N push force at 0.7 MPa to move heavy blanks into presses, relying on the adjustable stop to fine-tune the feeding depth accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-20 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (delivering 3518 N push at 0.7 MPa) lacks the necessary thrust for heavy loads, or step up further to a 160 mm bore if your application exceeds 11000 N. The adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops to accommodate product changeovers without physically swapping out the cylinder or adding external mechanical stops. Because the 425 mm stroke is substantial, an external guide is recommended to prevent excessive side-loading on the 32 mm rod thread. Remember that the rear adjuster functions only as a travel stop and does not hold the load without live air; for true load-holding, consider a SAIL pneumatic lock or BSAI clamp-lock cylinder. This model is dimensionally interchangeable per ISO 15552, uses PT tapered port threads, and requires no -S magnet for basic operation.
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 SAIJ125AX425-20 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. It can achieve a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster acts as an external stopper that lets you shorten the 425 mm nominal stroke by up to 20 mm, providing a usable travel window of 405-425 mm. It only sets the end-position and does not lock the load without continuous air pressure.
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