Airtac SAI125 Standard Air Cylinder SAI125X850
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X850 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X850
The AirTAC SAI125X850 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a robust push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making this 850 mm stroke variant ideal for sweeping material transfer or large press handling. The extruded aluminum barrel design omits tie-rods for a clean exterior while maintaining strict dimensional interchangeability with other ISO 15552 units.
Beyond the standard thrust metrics, this configuration features a carbon steel piston rod for high tensile durability under heavy axial loads. The barrel includes dual integrated sensor grooves, allowing direct mounting of CMSE or DMSE switches if a magnet is added later. For elevated thermal environments, the standard TPU seals can be swapped for Viton (H) or NBR (N) alternatives to match specific fluid and temperature demands.
Airtac SAI125 Standard Air Cylinder SAI125X850 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X850 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAI125X850
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAI125X850 Is Used
Large Press Handling
Provides the heavy thrust necessary to unload heavy stamped parts from large press beds over an extended 850 mm reach.
Bulk Material Diversion
Actuates large-scale diverter gates on heavy-duty conveyor lines where high mass and long travel distances are standard.
Automated Welding Indexing
Shifts heavy welding fixtures along multi-station automated lines, utilizing the full 850 mm stroke to move large structural components.
Is the Airtac SAI125 Standard Air Cylinder SAI125X850 the Right Cylinder?
Choose this 125 mm bore when 100 mm (3927 N at 0.5 MPa) lacks the thrust for moving massive assemblies, but before stepping up to the 160 mm class (10053 N at 0.5 MPa) which consumes significantly more air volume. At 850 mm of stroke, the extended carbon steel rod is highly susceptible to bending under side loads. Prevent premature rod-bearing wear by coupling this cylinder with an external linear guide or specifying a fully guided cylinder assembly.
This model uses a G1/2 PT tapered port and an M27x2 rod thread. It is a direct drop-in replacement for any ISO 15552 cylinder matching these bore and stroke dimensions. Note that the adjustable air cushions at both ends only decelerate the piston near stroke limits; they do not lock the load. If the application requires position holding without continuous air pressure, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant instead.
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 SAI125X850 FAQ
At 0.5 MPa operating pressure, the SAI125X850 cylinder exerts 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 SAI125X850 is a genuine AirTAC profile cylinder with an ISO 15552 mounting interface, making it dimensionally interchangeable with other ISO 15552 standard cylinders of the same bore and stroke.
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