Airtac SAI125 Standard Air Cylinder SAI125X155
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X155 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X155
The AirTAC SAI125X155 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty tasks, delivering a robust push force of 6136 N and pull force of 5734 N at 0.5 MPa. This specific 155 mm stroke is a made-to-order non-standard dimension, bridging the gap between the 150 mm and 160 mm standard strokes to provide exact travel for specialized machinery.
This extruded aluminum barrel unit features a standard carbon steel piston rod for high tensile strength in industrial environments. Without a magnet, it relies on external limit switches or mechanical stops, while the integrated adjustable air cushions at both ends manage the kinetic energy of its substantial moving mass.
Airtac SAI125 Standard Air Cylinder SAI125X155 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X155 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAI125X155
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAI125X155 Is Used
Automotive Stamping
Provides the high thrust necessary to form and hold heavy gauge metal panels in large stamping presses.
Pallet Transfer
Lifts and lowers heavy loaded pallets at conveyor junctions, utilizing the 155 mm stroke to clear transfer plates.
Plastic Injection Molding
Actuates large core pulls or heavy mold halves within injection molding machinery requiring substantial force.
Is the Airtac SAI125 Standard Air Cylinder SAI125X155 the Right Cylinder?
Selecting this 125 mm bore is appropriate when 100 mm bore cylinders (providing 3927 N push at 0.5 MPa) lack the thrust for heavy lifting, but a 160 mm bore is physically too large. The G1/2 PT tapered ports ensure high airflow to maintain velocity within its 30-500 mm/s operating range.
Because the 155 mm stroke is non-standard, expect a made-to-order lead time. If the application requires intermediate stopping or fails-safe load holding when air pressure is removed, pair this cylinder with an external pilot-operated check valve or select the SAIL air-released lock variant, as standard air cushions only decelerate the piston near stroke ends and will not hold a load.
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 SAI125X155 FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. If operating at 0.7 MPa, the push force increases to 8590 N.
Yes, as a true ISO 15552 profile cylinder, its mounting interface dimensions are standardized, making it interchangeable with other ISO 15552 cylinders of the same bore size.
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