Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75
The AirTAC SAIJ125X270-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust linear motion. It features a 125 mm bore generating 6136 N push force at 0.5 MPa, paired with a PT tapered port and a 32 mm carbon steel rod. Because of the 75 mm adjustment code, the effective travel window can be fine-tuned anywhere between 195 mm and 270 mm without swapping hardware.
This rear screw acts purely as a travel stop to set the retracted end position during commissioning, not as a lock to hold the load without live air. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic switches later if positioning feedback is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125X270-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125X270-75 Is Used
Product Changeover
Dial in the 195-270 mm travel window during format size changes on packaging lines without replacing the cylinder.
Machine Setup
Fine-tune the retracted end position mechanically at commissioning to achieve precise alignment of heavy tooling.
Variable End Stops
Adjust the rear stop screw to accommodate multiple part lengths on the same fixture without external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-75 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder falls short, offering 3927 N push at 0.5 MPa, or if you need less force than the 160 mm class at 10053 N. The 75 mm adjustment range is ideal for product-size changeovers on a line, letting you dial in the exact end-stop mechanically rather than adding external stops or buying a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, this standard adjuster will not suffice; you must integrate an external rod lock or look at the SAIL or BSAI series.
To match this ISO 15552 dimensionally interchangeable cylinder for a replacement, verify the 270 mm stroke, 75 mm adjustment, PT port thread, and mounting style. SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the 270 mm stroke is substantial, ensure adequate external guiding to prevent excessive side-loading on the rod.
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 SAIJ125X270-75 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 can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke from its 270 mm nominal length down to 195 mm. This stopper only sets the travel end position and does not lock the load without live air pressure.
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