Airtac SAI125 Standard Air Cylinder SAI125X550SH
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X550SH 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 SAI125X550SH
The AirTAC SAI125X550-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust push force of 6136 N at 0.5 MPa, this 125 mm bore unit is built to handle substantial loads over its 550 mm stroke. The extruded aluminum barrel omits tie-rods, providing a clean profile that integrates seamlessly into existing ISO 15552 mounting footprints.
Equipped with a magnetic piston (-S), this model supports CMSE and DMSE sensor switches via the dual side grooves on the barrel. For thermally demanding environments, the Viton (FKM) seal expands the operating envelope significantly beyond the standard TPU, while the carbon steel piston rod ensures high tensile strength under high-pressure cycles.
Airtac SAI125 Standard Air Cylinder SAI125X550SH Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X550SH |
|---|---|
| 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 SAI125X550SH
| 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 SAI125X550SH Is Used
Heavy Stamping Presses
Provides the high 6136 N push force required to actuate large forming dies and heavy-duty stamping assemblies.
Injection Molding Extraction
The Viton seal withstands ambient heat near molding machines, while the 550 mm stroke extracts bulky fabricated parts.
Pallet Lift Stations
Lifts substantial pallet loads vertically; external guide rails must support the side load to prevent rod deflection.
Is the Airtac SAI125 Standard Air Cylinder SAI125X550SH the Right Cylinder?
Selecting this 125 mm bore is appropriate when 80 mm falls short—yielding 2513 N at 0.5 MPa—and the next size, 160 mm, provides excessive thrust at 10053 N. The 550 mm stroke requires careful attention to mechanics: long unsupported rods are susceptible to bending under side loads. Implement external guide rails or choose a fully guided cylinder to prevent premature rod-bearing wear.
This cylinder is dimensionally interchangeable per ISO 15552, serving as a drop-in replacement for other standard profile cylinders. It features a G1/2 (PT tapered) port, an M27x2 rod thread, and 40 mm adjustable air cushions at both ends. Remember that the air cushion only decelerates the piston near stroke end; it does not lock the rod. If the machine loses air pressure, the load will drift. Use an external pilot-operated check valve or the AirTAC SAIL lock variant for secure position holding.
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 SAI125X550SH FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
Yes. The SAI125X550-S is a true ISO 15552 profile cylinder, making its mounting interface dimensionally interchangeable with other ISO 15552 standard cylinders. You can swap it directly using existing FA, FB, or TC mounting accessories.
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