Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75
The AirTAC SAIJ125X300-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits you to dial back the nominal 300 mm travel by up to 75 mm, creating a 225-300 mm usable end-position window. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for heavy industrial positioning.
This SKU uses a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-75 Is Used
Heavy Press Changeover
Dial in the exact 225-300 mm travel during product-size changeovers on heavy stamping lines without adding external mechanical stops.
Variable End-Stop Tuning
Fine-tune the retract end-position at machine commissioning to compensate for mechanical wear or sensor drift over time.
Large Material Diverter
Adjust the actuation reach on heavy-duty conveyor diverters to handle varying package sizes accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-75 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force but also demands variable end-stop tuning during machine setup or product changeover, avoiding the need to swap out a fixed-stroke SAI cylinder. If your thrust requirements are lower, stepping down to the 100 mm bore yields 3927 N of push force at 0.5 MPa.
Because this model has a 300 mm stroke, you should use an external guide to support the load and mitigate side-load stress on the 32 mm rod. Remember that the rear adjuster acts only as a travel stop to decelerate the load; it does not hold the load without live air. For true position holding without pressure, consider an external rod lock, or AirTAC SAIL and BSAI series cylinders.
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 SAIJ125AX300-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf.
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm from the 300 mm nominal length, giving a usable travel window of 225-300 mm. It acts as a stop to set the end position and is not a lock.
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