Airtac SAI125 Standard Air Cylinder SAI125AX550
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX550 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX550
The AirTAC SAI125X550 is a double-acting profile cylinder built to ISO 15552 dimensional standards, making it a drop-in replacement for other ISO 15552 cylinders. Delivering a substantial 8590 N of push force at 0.7 MPa, this 125 mm bore unit is engineered for heavy-duty automation.
This specific configuration features a SUS420J2 stainless steel piston rod (material code A) for superior corrosion and surface wear resistance, alongside PT tapered port threads. Because a magnet is not specified, it operates without integrated position sensing. The 550 mm stroke provides the extended travel needed for large-format material handling.
Airtac SAI125 Standard Air Cylinder SAI125AX550 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX550 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAI125 Standard Air Cylinder SAI125AX550
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAI125 Standard Air Cylinder SAI125AX550 Is Used
Heavy Stamping Ejection
Provides the high force and long travel needed to eject heavy metal stampings from large press dies.
Pallet Diverting
Actuates heavy pallet diverter arms on high-throughput packaging and logistics conveyor lines.
Large Door Actuation
Opens and closes large industrial access doors or machine safety guards that require substantial reach.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX550 the Right Cylinder?
Selecting this 125 mm bore makes sense when 100 mm bore cylinders (providing 5497 N push at 0.7 MPa) lack the necessary thrust. If your application requires less force, stepping down to an 80 mm bore yields 3518 N at 0.7 MPa and saves physical envelope space.
With a 550 mm stroke, the unsupported rod length is significant; side loads will cause rod-bearing bending. To prevent premature seal failure and guide wear, use an external guide rail or a fully guided cylinder. Furthermore, this standard SAI does not hold its load if air pressure drops—use the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant if mid-stroke holding is required. Ensure your ISO 15552 replacement matches the 125 mm bore, 550 mm stroke, PT G1/2 ports, and your chosen mounting accessory.
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 SAI125 Standard Air Cylinder SAI125AX550 FAQ
At an operating pressure of 0.7 MPa, the SAI125X550 provides 8590 N of push force and 5734 N of pull force. At 0.5 MPa, the push force is 6136 N.
Yes, the SAI125X550 is dimensionally interchangeable per ISO 15552 mounting interface standards. Ensure your setup matches the 125mm bore, 550mm stroke, G1/2 PT ports, and mounting accessories for a seamless drop-in replacement.
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