Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50
The AirTAC SAIJ125X275-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 225-275 mm usable travel window, allowing you to dial back the nominal 275 mm stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads without requiring a cylinder swap or external stops.
This variant uses a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear adjuster functions strictly as a travel stop, not a lock, so live air is required to maintain position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125AX275-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125AX275-50 Is Used
Product Changeover
Dial in the exact 225-275 mm end-stop distance instantly when switching machinery to handle different package lengths, bypassing complex mechanical retooling.
Heavy Press Fitting
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear stopper to precisely limit insertion depth and prevent part damage.
Variable End-Stop Positioning
Establish a customizable retract distance on automated assembly lines where multiple downstream stations require slightly different clearance distances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks thrust, but an 80 mm bore is too small. The 50 mm adjustment range is ideal for production lines running varying product sizes, letting you fine-tune the retract end-position on the fly instead of swapping a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify the 125 mm bore, 275 mm stroke, 50 mm adjuster, PT port thread, and the SUS420J2 rod material.
Because the 275 mm stroke creates a long lever arm, ensure external guiding is used to prevent excessive side-loading on the rod. For applications requiring the load to be held mechanically without continuous air pressure, this cylinder is insufficient; consider an AirTAC SAIL or BSAI locking cylinder instead.
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 SAIJ125AX275-50 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that shortens the retract stroke. For this SAIJ125X275-50 model, you can trim the effective travel anywhere within a 225 to 275 mm window without changing the cylinder's physical mounting.
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