Airtac SAI125 Standard Air Cylinder SAI125BX185
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX185 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 SAI125BX185
The AirTAC SAI125X185 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation, delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa. Because 185 mm is not a standard factory stroke, this unit is manufactured as a made-to-order configuration to exactly match your machine's kinematic requirements without compromising the ISO 15552 mounting envelope.
Built with a SUS304 stainless steel piston rod (material code B), this model provides superior corrosion resistance for humid or chemically exposed environments. The extruded aluminum barrel features sensor grooves on both sides for CMSE or DMSE switches if a magnet is added later, while the tapered PT port threads ensure a robust, leak-free pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125BX185 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX185 |
|---|---|
| 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 SAI125BX185
| 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 SAI125BX185 Is Used
Heavy Metal Stamping
Provides the robust 6136 N push force required to actuate large stamping presses and heavy gauge metal forming dies.
Large Clamp Fixtures
Ideal for securing bulky automotive components or large structural weldments during machining and assembly operations.
Pallet Diverters
Drives high-force diverter arms on heavy-duty roller conveyors to route large palletized goods across material handling lines.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX185 the Right Cylinder?
Selecting this 125 mm bore is ideal when a 100 mm bore (offering 3927 N push at 0.5 MPa) is structurally insufficient, but stepping up to a massive 160 mm bore (10053 N) would be excessive overkill. The 185 mm stroke provides a specific mid-range extension that standard 175 mm or 200 mm options cannot achieve.
Because the 185 mm stroke is custom, verify your side-load calculations carefully; long unsupported rods are prone to bending under lateral stress, so utilize external guide rails or a fully guided cylinder if the load is not perfectly axial. Furthermore, if your machinery must hold a load vertically or resist drift during a complete loss of air pressure, this standard SAI cylinder will drift under load—integrate the SAIL variant (with an air-released lock) or an external pilot-operated check valve for secure positioning.
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 SAI125BX185 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If pressure is increased to 0.7 MPa, the push force reaches 8590 N.
Yes, the SAI125X185 is dimensionally interchangeable per ISO 15552 standards, allowing it to serve as a drop-in replacement for other ISO 15552 profile cylinders using the same bore, stroke, PT port, and mounting accessories.
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