Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30
The AirTAC SAIJ125X325-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel within a 295-325 mm window. It delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. This specific configuration incorporates a SUS420J2 stainless steel rod for enhanced corrosion resistance and utilizes PT tapered port threads.
Because the stroke extends to 325 mm, the 32 mm rod diameter and M27x2 rod thread should be paired with an external guide to manage side loads and prevent premature seal wear. The rear adjuster acts purely as a travel stop to dial in the exact end position during commissioning; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125AX325-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125AX325-30 Is Used
Heavy-Duty Press Tuning
Dial in the exact 295-325 mm travel window during machine commissioning to achieve precise pressing force on large bearings without swapping out components.
Product Changeover Stops
Adjust the rear stopper up to 30 mm to accommodate different package sizes on a heavy-duty conveyor line, enabling rapid format changes.
Large Fixture Positioning
Leverage the 6136 N pull force to shift heavy industrial fixtures into their final working position, fine-tuning the end-stop to match the fixture geometry.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder's 2268 N pull at 0.5 MPa is insufficient for your dynamic load requirements. The adjustable stroke is ideal for product changeovers on a line, allowing operators to shift the end-stop by up to 30 mm without physically swapping the cylinder or adding external mechanical stops. If your application requires the load to be held securely in place without continuous air pressure, you must integrate an external rod lock or look at the SAIL or BSAI series instead.
When replacing an existing ISO 15552 cylinder, verify that your setup matches this unit's 325 mm stroke, 30 mm adjustment range, PT G1/2 ports, and chosen mounting bracket from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this specific SKU does not include a piston magnet, so it will not work with CMSE or DMSE sensors.
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 SAIJ125AX325-30 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. It can deliver a maximum push force of 11045 N at 0.7 MPa.
The rear adjuster allows you to shorten the nominal 325 mm stroke by up to 30 mm, providing a usable travel window of 295 to 325 mm. This stopper only sets the end position and deceleration; it does not lock the load without live air pressure.
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