Airtac SAI125 Standard Air Cylinder SAI125X550
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X550 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 SAI125X550
The AirTAC SAI125X550 is a double-acting profile cylinder built to ISO 15552 standards, delivering a robust 6136 N push force at 0.5 MPa and 8590 N at 0.7 MPa. Its 550 mm stroke provides the extended travel needed for large-format clamping and heavy material positioning. The extruded aluminum barrel omits tie-rods for a clean exterior while maintaining structural rigidity under high pneumatic loads.
To match demanding industrial environments, this unit features a carbon steel piston rod for high tensile strength and wear resistance. The standard TPU seals handle typical factory temperatures, but you can specify Viton (H) seals for high-heat applications up to +70 C. For operations requiring position feedback, the barrel includes dual sensor grooves for CMSE or DMSE switches when a magnet is added.
Airtac SAI125 Standard Air Cylinder SAI125X550 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X550 |
|---|---|
| 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 SAI125X550
| 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 SAI125X550 Is Used
Heavy Stamping
Provides the 6136 N force at 0.5 MPa and 550 mm reach required to actuate large metal forming and stamping presses.
Bulk Material Handling
Extends across wide transfer lines to push heavy pallets or bulk material chutes efficiently.
Automated Assembly
Drives large-format component placement and heavy tooling fixtures in automated automotive assembly cells.
Is the Airtac SAI125 Standard Air Cylinder SAI125X550 the Right Cylinder?
Stepping down to the 100 bore drops the 0.5 MPa push force to 3927 N, which may be insufficient for heavy 125-class loads, while moving up to the 160 bore yields 10053 N for massive actuation requirements. Because this 550 mm stroke exceeds 300 mm, the unsupported rod is highly susceptible to bending under side loads; utilize an external guide rail or a guided cylinder to prevent premature rod-bearing wear.
This model uses a G1/2 PT port and an M20x1.5 rod thread. It is dimensionally interchangeable per ISO 15552, serving as a drop-in replacement for other ISO 15552 profile cylinders. If your machinery must hold a load vertically without continuous air pressure, this standard cylinder will drift; instead, specify the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock.
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 SAI125X550 FAQ
At 0.5 MPa, the push force is 6136 N, increasing to 8590 N at 0.7 MPa and 11045 N at 0.9 MPa.
Yes, the SAI125X550 is dimensionally interchangeable per ISO 15552, acting as a drop-in replacement for other standard profile cylinders of the same bore and stroke.
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