Airtac SAI125 Standard Air Cylinder SAI125AX55
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX55 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX55
The AirTAC SAI125X55 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty operations, delivering a robust push force of 6136 N at 0.5 MPa. This specific 55 mm stroke is a custom made-to-order dimension tailored for short-travel, high-thrust clamping or pressing tasks. As a genuine AirTAC component, it ensures a true drop-in replacement for other ISO 15552 profile cylinders without altering your existing mounting footprint.
Beyond the standard spec sheet, this unit is configured with a SUS420J2 stainless steel piston rod (material code A) for superior resistance against moisture and surface corrosion. It features PT tapered port threads for a reliable, leak-free pneumatic connection. Note that because a -S magnet option was not specified, it will not directly mount CMSE or DMSE reed sensors without modification.
Airtac SAI125 Standard Air Cylinder SAI125AX55 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX55 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAI125AX55
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAI125AX55 Is Used
Heavy-Duty Pressing
Provides the substantial 6136 N force at 0.5 MPa required for securely pressing bearings or pins into heavy housings.
Industrial Clamping
Ideal for immobilizing large steel or cast iron workpieces during aggressive CNC milling and machining operations.
Pallet Stopping
Functions as a heavy-duty stopper block for high-mass pallets on automated assembly line conveyors.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX55 the Right Cylinder?
With a 125 mm bore, this cylinder sits in a heavy force class; if your application only requires around 3927 N of push force at 0.5 MPa, stepping down to the 100 mm bore variant will reduce air consumption and physical footprint. The 55 mm stroke is non-standard, so verify your dead-length space constraints carefully. For any mechanism needing to hold a load securely without continuous air pressure, remember that a standard SAI cylinder will drift when pressure is exhausted; you should specify the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock instead.
Since the stroke is under 300 mm, rod-bearing bending from side loads is minimal, but you must still ensure the load moves along a straight axis to prevent premature seal wear. Mounting accessories include FA/FB flanges for rigid front attachment, or CA/CB clevis joints to accommodate pivoting arc movements.
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 SAI125AX55 FAQ
At 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If operated at 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X55 is a true ISO 15552 profile cylinder, making its mounting interface dimensionally interchangeable with other ISO 15552 cylinders such as those from Festo or SMC.
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