Airtac SAI125 Standard Air Cylinder SAI125X550S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X550S 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 SAI125X550S
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 just 0.5 MPa, this 125 mm bore actuator is designed to drive substantial masses. The 550 mm stroke provides the extended travel distance required for large indexing, pressing, or material handling tasks. It features an extruded aluminum barrel without tie-rods, conforming strictly to ISO 15552 mounting dimensions for seamless drop-in compatibility.
This specific configuration includes a standard carbon steel piston rod and a built-in magnet (-S) for position sensing. The magnet interacts seamlessly with CMSE and DMSE series reed switches, which seat neatly into the dual sensor grooves machined into both sides of the barrel. Fluid compatibility is limited to filtered 40 μm air, operating reliably within a 0.15-1.0 MPa pressure range.
Airtac SAI125 Standard Air Cylinder SAI125X550S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X550S |
|---|---|
| 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 SAI125X550S
| 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 SAI125X550S Is Used
Heavy-Duty Stamping
Provides the 6136 N force at 0.5 MPa needed to seat bearings, stamp thick gauge metal, or form rigid components over a 550 mm travel distance.
Pallet Transfer
Indexes heavy loaded pallets along extended conveyor lines, using the 550 mm stroke to push large workpieces between machining stations.
Automated Assembly
Drives large press-fit operations or actuates heavy industrial tooling, utilizing the -S magnet to trigger CMSE sensors for precise end-of-stroke confirmation.
Is the Airtac SAI125 Standard Air Cylinder SAI125X550S the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm variant doubles the available thrust, stepping up from 3927 N to 6136 N at 0.5 MPa, which is critical if your pneumatic circuit cannot exceed lower supply pressures. Conversely, if your application does not require over 6 kN of force, dropping to the 100 mm bore reduces air consumption and physical footprint. This model utilizes PT tapered G1/2 ports and standard 27 mm adjustable air cushions at both ends to dampen impact.
Because the 550 mm stroke creates a long, unsupported rod extension, it is highly susceptible to bending under side loads. To prevent premature rod-bearing failure, mount external guide rails or employ a fully guided cylinder mechanism. Furthermore, the adjustable cushions only decelerate the piston near stroke ends; they do not lock the load. If the assembly must hold position during a complete loss of air pressure, integrate an external pilot-operated check valve or specify the SAIL variant with an air-released locking mechanism.
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 SAI125X550S FAQ
At a 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 profile cylinder built to exact ISO 15552 mounting interface standards, making it dimensionally interchangeable with other ISO 15552 cylinders of the same bore size, regardless of brand.
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