Airtac SAI125 Standard Air Cylinder SAI125X185S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X185S 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 SAI125X185S
The AirTAC SAI125X185-S 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 is built to handle substantial loads across its 185 mm stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that simplifies mounting and sensor placement.
Equipped with a magnetic piston (-S), this model readily integrates with CMSE and DMSE reed switches via the dual sensor grooves on the barrel. The standard carbon steel piston rod ensures high tensile strength for rigorous cycling. For environments exceeding standard thermal limits, the seal configuration can be upgraded to Viton (H) for enhanced high-temperature resistance.
Airtac SAI125 Standard Air Cylinder SAI125X185S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X185S |
|---|---|
| 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 SAI125X185S
| 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 SAI125X185S Is Used
Heavy Stamping
Provides the 6136 N push force required to actuate large mechanical presses and form rigid metal components securely.
Pallet Diverting
Drives robust routing arms in high-mass material handling lines, using the magnetic piston for precise end-of-stroke confirmation.
Injection Molding Extraction
Extracts heavy molded parts from presses, utilizing the durable carbon steel rod to withstand repetitive high-inertia loads.
Is the Airtac SAI125 Standard Air Cylinder SAI125X185S the Right Cylinder?
Select this 125 mm bore cylinder when a 100 mm bore (providing 3927 N at 0.5 MPa) lacks the necessary thrust for your heavy payload. If your application requires less force and faster cycle times, stepping down to an 80 mm bore yields 2513 N. Because this 185 mm stroke is relatively short for this bore size, side-load stress on the rod bearing is minimal, though external guides are always recommended for rigidly offset loads.
As a true ISO 15552 profile cylinder, it serves as a drop-in replacement for any standard 125 mm bore unit with a 185 mm stroke, matching PT port and mounting dimensions exactly. Note that the adjustable air cushions only decelerate the piston at stroke ends; if the air supply is lost, the cylinder cannot hold a load. For positive holding without pressure, specify the SAIL or BSAI locking variant.
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 SAI125X185S FAQ
At 0.5 MPa operating pressure, 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-S shares the exact ISO 15552 mounting interface and PT port dimensions, allowing it to serve as a drop-in replacement for comparable 125x185 cylinders from other manufacturers.
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