Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100
The AirTAC SAIJ125X240-100 is a double-acting ISO 15552 profile cylinder engineered to deliver 6136N of push force at 0.5MPa. It features a robust 32mm carbon steel piston rod and a PT G1/2 tapered port, making it a heavy-duty solution for demanding pneumatic setups. The extruded aluminum barrel includes sensor grooves on both sides for straightforward position monitoring.
Equipped with a rear mechanical stopper, this model allows you to trim the effective travel down from a 240mm nominal stroke, creating a 140-240mm usable adjustment window. This wide tuning range is ideal for product changeovers, letting you fine-tune the retract end-position at commissioning without adding external stops or swapping the cylinder. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-100 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 140-240mm window during machine commissioning to accommodate different material thicknesses without mechanical rework.
Production Line Changeover
Quickly adjust the stroke length up to 100mm when switching the manufacturing line to a new product size, minimizing downtime and avoiding cylinder swaps.
Heavy-Duty Forming
Leverage the 6136N push force at 0.5MPa for pressing or forming tasks, using the adjustable stop to precisely control the end-of-stroke impact depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires substantial thrust, such as 6136N push or 5734N pull at 0.5MPa, and you need versatile end-position tuning. If your setup demands less force, stepping down to a 100mm bore yields 3927N push force. Conversely, moving up to a 160mm bore provides 10053N. Because the nominal stroke is 240mm, an external guide should be considered to manage side-load on the 32mm rod during extended travel.
Choose the SAIJ adjustable-stroke format over a fixed SAI model when your machine requires variable end-stops or frequent product-size changeovers. For load-holding without continuous air pressure, note that this cylinder's rear stopper is not a lock; you would need to look at the SAIL or BSAI series instead. This SKU uses PT tapered ports, a carbon steel rod, no magnet, and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X240-100 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder generates a push force of 6136N and a pull force of 5734N. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 240mm nominal stroke by up to 100mm. This provides an effective travel window of 140-240mm, which can be fine-tuned during setup without changing the cylinder.
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