Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30
The AirTAC SAIJ125X500-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136 N push force at 0.5 MPa. It features a 500 mm nominal stroke that can be fine-tuned down by up to 30 mm, creating a precise 470-500 mm usable travel window. This adjustability allows you to dial in the retract end position during commissioning without swapping out the entire unit.
Built with a carbon steel piston rod and a PT tapered port thread, this 125 mm bore profile cylinder operates at speeds of 30-500 mm/s. The rear adjuster acts purely as a mechanical stop to set the travel limit and is not a locking device. For applications requiring the load to be held without live air pressure, an external rod lock or the related AirTAC SAIL pneumatic lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-30 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 470-500 mm window during machine setup to accommodate different material lengths without adding external mechanical stops.
Product Line Changeover
Quickly adjust the stroke end position by up to 30 mm when switching the manufacturing line to a new product size, minimizing downtime between production runs.
Heavy-Duty Forming Press
Leverage the 6136 N push force at 0.5 MPa for heavy forming operations while using the rear screw to fine-tune the tooling clearance precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-30 the Right Cylinder?
Choose this 125 mm bore cylinder when substantial thrust is needed but exact end-positioning varies between product runs; stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N. The SAIJ125X500-30 is selected over a fixed-stroke SAI when you need an external adjustment screw to trim the retract stroke by up to 30 mm on the fly. To match this ISO 15552 footprint exactly, specify the 125 mm bore, 500 mm stroke, PT port thread, and your desired mounting style from the available set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because this model features a 500 mm stroke, the extended carbon steel rod is subject to increased side-loading risks. Even with the M27x2 rod thread providing a robust interface, an external guide rail should be incorporated to support the load and prevent cylinder binding over long travel distances.
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 SAIJ125X500-30 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the 500 mm nominal stroke by up to 30 mm, providing a usable travel range of 470-500 mm. This stopper sets the end position but does not lock the load without live air pressure.
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