Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75
The AirTAC SAIJ125X450-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 450mm nominal stroke can be dialed back by up to 75mm, creating a precise 375-450mm usable travel window. This built-in adjustability allows operators to fine-tune end positions during commissioning or product changeovers without swapping the cylinder or adding external stops.
Featuring a robust 32mm carbon steel rod and an M27x2 thread, this bore size handles substantial loads while operating at speeds of 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125X450-75 Is Used
Product Size Changeovers
Quickly dial the travel window back from 450mm to 375mm when a packaging line switches to a smaller carton format, minimizing machine downtime.
Heavy Press Positioning
Provides 6136N of push force at 0.5MPa for forming applications, with a rear stopper that allows exact end-position tuning during initial machine commissioning.
Variable End-Stop Actuation
Used in automated material handling where the rear adjuster fine-tunes the retraction point on the fly without bolting on external physical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75 the Right Cylinder?
Selecting this 125mm bore makes sense when an application requires heavy thrust, such as 6136N push at 0.5MPa, combined with variable end-stop positioning. If a setup demands less force, stepping down to a 100mm bore yields 3927N push force at 0.5MPa. The adjustable stroke is specifically chosen over a fixed SAI cylinder when a production line requires frequent product-size changes, allowing rapid reconfiguration of the 375-450mm travel window.
Because the 450mm stroke is relatively long, an external guide should be used to prevent excessive rod side-loading. For load-holding without continuous live air, this cylinder is insufficient since the rear adjuster is a stop, not a lock; consider an AirTAC SAIL or BSAI cylinder instead. To match this ISO 15552 interchangeable unit, specify the 125mm bore, 450mm stroke, 75mm adjustment, PT tapered ports, and the required mounting kit.
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 SAIJ125X450-75 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 75mm. This creates a usable travel window of 375-450mm, enabling fine-tuning of the end position at commissioning without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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