Airtac SAI125 Standard Air Cylinder SAI125BX850
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX850 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 SAI125BX850
The AirTAC SAI125X850 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation, delivering a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. This 850 mm stroke variant is well-suited for transferring substantial loads across long linear distances. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that simplifies mounting and sensor placement.
Built to exacting standards, this specific configuration features a SUS304 stainless steel piston rod for superior corrosion resistance in harsh environments. It utilizes PT tapered port threads and operates without a magnet. If your workflow requires end-position holding under pressure loss, consider the SAIL or BSAI clamp-lock variants, as standard air cushions only decelerate the piston near stroke end.
Airtac SAI125 Standard Air Cylinder SAI125BX850 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX850 |
|---|---|
| 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 SAI125BX850
| 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 SAI125BX850 Is Used
Heavy Material Transfer
Ideal for pushing heavy pallets or workpieces along extended conveyor lines where the 6136 N thrust at 0.5 MPa ensures reliable movement over the full 850 mm travel.
Large Press Ejection
Provides the robust linear force required to eject finished parts from large stamping or molding presses, utilizing the full stroke length to clear the machine bed safely.
Automated Storage Retrieval
Deploys goods from high-density automated storage systems, where the SUS304 rod material withstands fluctuating environmental conditions and the long stroke reaches deep into racking.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX850 the Right Cylinder?
Selecting this 125 mm bore cylinder is appropriate when application thrust requirements exceed the 3927 N push force of a 100 mm bore at 0.5 MPa, but fall below the 10053 N capacity of a 160 mm bore. Operating at a speed range of 30-500 mm/s, it handles substantial actuation tasks efficiently.
Because the 850 mm stroke creates a long unsupported rod extension, side loads can cause rod-bearing bending and premature wear. Implement an external guide rail or utilize a guided cylinder to manage off-axis forces. As a true ISO 15552 profile cylinder, it offers a drop-in dimensional replacement for other standard cylinders, matching the 125 mm bore, 850 mm stroke, G1/2 port, and standard mounting accessories like TC trunnions.
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 SAI125BX850 FAQ
At 0.5 MPa operating pressure, the SAI125X850 provides a push force of 6136 N and a pull force of 5734 N. If operating at 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X850 is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement using the same 125 mm bore, 850 mm stroke, G1/2 port, and standard mounting accessories without modifying the machine frame.
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