Airtac SAI125 Standard Air Cylinder SAI125BX850S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX850S 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 SAI125BX850S
The AirTAC SAI125X850-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a robust push force of 8590 N at 0.7 MPa, making it well-suited for moving substantial masses over its 850 mm travel distance. As a standardized profile barrel design, it integrates seamlessly into global machinery footprints without requiring custom mounts.
This specific configuration includes a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. It is equipped with a magnetic piston (-S) that operates seamlessly with CMSE and DMSE sensor switches fitted into the dual side grooves on the extruded aluminum barrel.
Airtac SAI125 Standard Air Cylinder SAI125BX850S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX850S |
|---|---|
| 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 SAI125BX850S
| 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 SAI125BX850S Is Used
Heavy Stamping Ejection
Provides the high output force necessary to eject dense metal stampings from press dies, utilizing the 850 mm stroke to clear the tooling area completely.
Large Mold Handling
Shifts heavy injection molds or tooling blocks along production lines, relying on the robust 125 mm bore to manipulate loads exceeding half a ton safely.
Pallet Dispenser Pusher
Pushes empty or loaded pallets into positioning stations, where the extended 850 mm travel accommodates various pallet widths without manual adjustment.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX850S the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm variant upgrades your push force at 0.5 MPa from 3927 N to 6136 N, a critical jump for high-inertia loads. Conversely, if your application requires less than 4000 N, stepping down to the 100 mm bore saves physical envelope space and air consumption. Because this model features an 850 mm stroke, the extended unsupported rod is highly susceptible to bending under side loads; utilizing an external guide rail or a dedicated guided cylinder is strongly recommended to prevent premature rod-bearing wear.
This cylinder uses a PT G1/2 port and operates at speeds of 30-500 mm/s. It is dimensionally interchangeable per ISO 15552, serving as a drop-in replacement for other ISO 15552 cylinders. If the machinery must hold a load vertically without continuous air pressure, note that the standard adjustable air cushions only decelerate the piston at stroke end and do not lock position; you must specify an external pilot-operated check valve or select the SAIL variant for true pneumatic locking.
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 SAI125BX850S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates a push force of 8590 N and a pull force of 5734 N. At 0.5 MPa, the push force is 6136 N.
Yes, the SAI125X850-S is built to the ISO 15552 dimensional standard, meaning it is a drop-in replacement for other ISO 15552 profile cylinders of the same bore and stroke. Ensure your mounting accessories and G1/2 porting match the interface.
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