Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100 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 SAIJ125X270-100
The AirTAC SAIJ125X270-100 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a substantial 6136N push force at 0.5MPa, with a nominal 270mm stroke that can be dialed back by up to 100mm. This yields a usable travel window of 170-270mm, enabling precise end-position calibration during commissioning without swapping out the physical cylinder.
This bore utilizes a PT tapered G1/2 port and a robust 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The extruded aluminum barrel includes dual sensor grooves for tracking position. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR styles.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100 |
|---|---|
| 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 SAIJ125X270-100
| 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 SAIJ125X270-100 Is Used
Variable End-Stop Machining
Dial in the exact 170-270mm clamping position for different part lengths on a single fixture without changing cylinders or adding external stopper blocks.
Product-Size Changeover
Quickly reconfigure sorting gates and diverters on packaging lines by adjusting the rear stopper up to 100mm to handle varied carton widths.
Heavy Assembly Pressing
Leverage the 6136N push force at 0.5MPa for heavy-duty pressing operations while fine-tuning the bottoming position to protect assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-100 the Right Cylinder?
Select this 125mm bore when an application requires heavy thrust—stepping down to a 100mm bore yields 3927N at 0.5MPa, while this model provides 6136N. The adjustable 170-270mm window is ideal for machinery requiring variable end-stops or product-size changeovers. Because the stroke is 270mm, an external guide is recommended to support the load and prevent excessive side-load wear on the rod bushings.
The rear adjuster acts as a mechanical stop to set deceleration, but it does not hold the load without live air. For true load-holding without continuous pressure, specify an AirTAC SAIL pneumatic lock, BSAI clamp-lock, or an external rod lock. This cylinder is dimensionally interchangeable per ISO 15552 mounting interfaces, uses PT ports, and does not include a magnet (-S is not specified).
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 SAIJ125X270-100 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the effective travel from the nominal 270mm down by up to 100mm, creating a 170-270mm usable window. It functions as a travel stop and does not lock the load without live air pressure.
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