Airtac SAI125 Standard Air Cylinder SAI125X185
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X185 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X185
The AirTAC SAI125X185 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust push force of 6136 N at 0.5 MPa, this 125 mm bore unit utilizes a 185 mm stroke to power demanding industrial tasks. The extruded aluminum barrel design eliminates tie-rods, providing a clean profile that drops directly into standardized ISO 15552 mounting footprints.
This configuration features a standard carbon steel piston rod and PT tapered port threads. Because a magnet is not specified, it operates without electronic position sensing. For applications requiring extreme heat resistance, the standard TPU seals can be swapped for Viton (H) alternatives, while the SAIL variant offers an integrated air-released lock for secure load holding.
Airtac SAI125 Standard Air Cylinder SAI125X185 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X185 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAI125X185
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAI125X185 Is Used
Heavy Stamping
Provides the high kinetic energy and 6136 N thrust required to drive heavy stamping and forming presses in metal fabrication lines.
Injection Molding
Actuates large mold cores and heavy ejector mechanisms in plastic injection molding machinery where substantial push force is mandatory.
Pallet Diverting
Powers robust diverters and heavy-duty stopping mechanisms on automated pallet conveyor systems handling substantial product weights.
Is the Airtac SAI125 Standard Air Cylinder SAI125X185 the Right Cylinder?
Select this 125 mm bore model when a 100 mm cylinder cannot supply the necessary thrust, as stepping up from a 100 bore significantly increases the push force from 3927 N to 6136 N at 0.5 MPa. The 185 mm stroke is well below the 300 mm threshold, minimizing rod-bearing bending concerns and making it suitable for direct side-load-free actuation without external guides.
If your machinery loses pneumatic pressure, this standard cylinder cannot hold its load and the piston will drift. For vertical or suspended loads that require fail-safe positioning, specify the SAIL lock variant or integrate an external pilot-operated check valve. To ensure seamless replacement, match the 185 mm stroke, G1/2 port, and appropriate mounting accessory like the TC trunnion.
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 SAI125X185 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 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 SAI125X185 is dimensionally interchangeable per ISO 15552. You can drop it into existing footprints matching the 125 mm bore, 185 mm stroke, and G1/2 port size without altering the machine frame.
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