Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75 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 SAIJ125AX325-75
The AirTAC SAIJ125X325-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 325mm stroke that can be dialed back by up to 75mm, creating a 250-325mm usable travel window for precise end-position tuning during commissioning. Delivering 6136N of push force at 0.5MPa, it handles heavy industrial loads while maintaining a standard ISO 15552 mounting footprint.
This model features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Note that the rear adjuster acts purely as a mechanical stop to set deceleration and travel length; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75 |
|---|---|
| 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 SAIJ125AX325-75
| 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 SAIJ125AX325-75 Is Used
Product Changeover
Quickly adjust the retract end-stop from 325mm down to 250mm to accommodate different material lengths on a single production line without changing cylinders.
Commissioning Calibration
Fine-tune the final end-position during machine setup to hit exact mechanical stops, absorbing minor design tolerances without re-machining parts.
Heavy Material Handling
Leverage the 6136N push force at 0.5MPa to move heavy pallets or metal components, using the adjustable stroke to vary the push-off distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-75 the Right Cylinder?
Choose this 125mm bore cylinder when you need 6136N thrust at 0.5MPa (or 8590N at 0.7MPa) and require variable end-stops for product changeovers. If your application needs less force, stepping down to an 80mm bore yields 2513N at 0.5MPa. The adjustable rear screw allows you to fine-tune the retract position without swapping cylinders or adding external stops, which is ideal for machines processing varying product sizes. Because the stroke is 325mm, ensure you use an external guide to support the load and mitigate side-load stress on the rod.
When replacing an ISO 15552 cylinder, match the 125mm bore, 325mm stroke, 75mm adjustment range, PT G1/2 port, and your required mounting accessories. This SAIJ variant supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. For applications requiring true load-holding without continuous air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) series instead.
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 SAIJ125AX325-75 FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the operating pressure to 0.7MPa, the push force rises to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 325mm down to a minimum of 250mm. This creates a 250-325mm adjustable travel window for precise end-position tuning without altering the cylinder's physical mounting.
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