Airtac SAI125 Standard Air Cylinder SAI125AX550S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX550S 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 SAI125AX550S
The AirTAC SAI125X550-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N of push force at 0.5 MPa, it integrates seamlessly into standardized mounting setups. This specific 550 mm stroke configuration is tailored for extended-travel tasks requiring substantial linear thrust.
This model includes a piston magnet (-S) for direct compatibility with CMSE and DMSE reed switches, fitting neatly into the extruded aluminum barrel's dual-side sensor grooves. Additionally, the piston rod is constructed from SUS420J2 stainless steel (material code A), offering superior corrosion resistance compared to standard carbon steel, making it well-suited for harsher production environments.
Airtac SAI125 Standard Air Cylinder SAI125AX550S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX550S |
|---|---|
| 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 SAI125AX550S
| 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 SAI125AX550S Is Used
Heavy-Duty Stamping
Ideal for applying high linear force in metal forming and stamping presses where a 6136 N push load is required over a long 550 mm travel distance.
Automotive Component Handling
Perfect for shifting heavy automotive chassis parts or engine blocks along assembly lines, utilizing the SUS420J2 stainless steel rod for durability in oily environments.
Pallet Positioning
Excels in actuating large pallet stops or heavy-duty diverters on conveyor systems, where the integrated magnet allows precise end-of-stroke confirmation via CMSE sensors.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX550S the Right Cylinder?
Providing 6136 N of thrust at 0.5 MPa, this 125 mm bore cylinder is a powerhouse for heavy load manipulation. If an application requires less force and faster cycling, stepping down to the 100 mm bore (which yields 3927 N at 0.5 MPa) is advisable. Conversely, operations demanding extreme push power might consider the 160 mm variant, though the 125 mm class often hits the optimal balance of power and speed.
Because the 550 mm stroke generates significant leverage, side-load forces can severely stress the rod bearing and cause premature wear. For such extended strokes, utilizing an external guide rail or a fully guided cylinder is strongly recommended to prevent rod bending. Furthermore, the adjustable air cushions at both ends only decelerate the piston near stroke limits; they do not lock the rod. If your process must hold a load securely without continuous air pressure, integrate an external pilot-operated check valve or specify the SAIL (air-released lock) variant.
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 SAI125AX550S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI series is a genuine ISO 15552 (original ISO 6431) profile cylinder. Its standardized mounting interface and PT G1/2 port make it dimensionally interchangeable with other ISO 15552 cylinders, allowing for a seamless drop-in replacement.
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