Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50S 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 SAIJ125AX270-50S
The AirTAC SAIJ125X270-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 220 to 270 mm. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, and this specific configuration includes a SUS420J2 stainless steel rod and a magnetic piston for position detection.
Instead of relying on fixed stops, the integrated rear screw allows you to fine-tune the retract end position directly during commissioning. This adjuster acts purely as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider an external rod lock or related types like the SAIL or BSAI cylinders.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50S |
|---|---|
| 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 SAIJ125AX270-50S
| 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 SAIJ125AX270-50S Is Used
Heavy-Duty Forming Stops
Dial in the exact retract position for metal forming or stamping operations, absorbing high impact forces with the 125 mm bore while fine-tuning the 220-270 mm travel window.
Product Diversion Changeover
Quickly adapt diverter arms on a conveyor line during product size changes without physically replacing the cylinder, using the 50 mm rear adjustment screw.
Machine Setup Calibration
Achieve precise end-of-stroke positioning during initial machine commissioning, using the rear stopper to offset mechanical tolerances without adding external shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N at 0.5 MPa) is insufficient for your thrust requirements, but you want to avoid stepping up to a 160 mm size. The adjustable stroke is ideal for product-size changeovers on a line, allowing you to dial in the exact end position without swapping cylinders. To match this ISO 15552 interchangeable cylinder, confirm your bore, 270 mm stroke, 50 mm adjustment, PT ports, and mounting style.
Since the 270 mm stroke is substantial, ensure adequate external guidance to prevent excessive side loading on the SUS420J2 rod. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. The included -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors.
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 SAIJ125AX270-50S 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 mechanically shorten the effective stroke from its 270 mm nominal length down to 220 mm. This creates a 220-270 mm adjustable travel window for fine-tuning the end position at commissioning.
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