Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X45-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 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 SAIJ125X45-20S
The AirTAC SAIJ125X45-20-S is a double-acting, double-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. The integrated -S magnet enables position detection with AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves.
This specific SKU features a 45 mm nominal stroke paired with a 20 mm adjustment range, creating a usable travel window of 25 to 45 mm. You can fine-tune the retract end-position at commissioning without installing external stops. The carbon steel piston rod features an M27x2 thread, and the cylinder operates at speeds between 30 and 500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125X45-20S Is Used
Product Changeovers
Dial in the 25-45 mm travel window during format size changes without physically swapping the cylinder or adding external mechanical stops.
End-Stop Calibration
Fine-tune the retract position during machine commissioning using the 20 mm adjustment range, ensuring perfect alignment before final lockdown.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-20S the Right Cylinder?
Select this 125 mm bore when an application requires heavy force that a 100 mm bore cannot provide, or when stepping down from a 160 mm bore to save space. The adjustable stroke is ideal for product-size changeovers on a line, allowing the end-stop to be dialed back precisely by up to 20 mm.
Because the 45 mm stroke is well below the 300 mm threshold, external side-load guides are less critical here than with longer strokes, though the robust M27x2 rod thread handles substantial mechanical loads. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder. This model uses PT tapered ports and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X45-20S FAQ
At 0.7 MPa, the push force increases to 8590 N. The operational speed range is 30-500 mm/s.
The rear adjuster screw allows you to shorten the 45 mm nominal stroke by up to 20 mm, providing a usable travel window of 25 to 45 mm. This stopper fine-tunes the end position but does not lock the load without continuous air pressure.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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