Airtac SAI125 Standard Air Cylinder SAI125X25
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X25 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X25
The AirTAC SAI125X25 is a double-acting ISO 15552 profile cylinder engineered for high-force, short-stroke execution. Delivering a robust 6136 N of push force at 0.5 MPa, it is tailored for heavy-duty clamping and holding operations. The extruded aluminum barrel design omits tie rods, providing a clean exterior while maintaining strict dimensional interchangeability with other ISO 15552 cylinders.
This configuration features a standard carbon steel piston rod and PT (tapered) G1/2 port threads. Because a magnet is not specified, the unit lacks the internal magnetic piston required for direct switch sensing. If position feedback is necessary, adding the -S magnet option allows the dual side sensor grooves to host CMSE or DMSE switches.
Airtac SAI125 Standard Air Cylinder SAI125X25 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X25 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAI125X25
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SAI125X25 Is Used
Heavy-Duty Stamping
Provides the 6136 N force at 0.5 MPa needed to hold metal workpieces securely under a hydraulic stamping press.
Injection Molding Ejector
Short 25 mm stroke delivers rapid, high-impact ejection of dense plastic parts from injection molds.
Press Brake Clamping
Generates massive holding power to secure thick steel plates during heavy industrial bending operations.
Is the Airtac SAI125 Standard Air Cylinder SAI125X25 the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm variant increases your 0.5 MPa push thrust from 3927 N to 6136 N, making it suitable for overpowering heavy mechanical resistance. Conversely, dropping to an 80 mm bore reduces the footprint and thrust to 2513 N. The 25 mm stroke is highly compact, minimizing rod-bearing bending stress.
For applications requiring positive load holding during air loss, the standard SAI cylinder will drift; consider the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock. As a direct drop-in replacement, verify the 125 mm bore, 25 mm stroke, G1/2 PT ports, and your specific mounting accessory (such as CA clevis or LB foot).
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 SAI125X25 FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, the push force increases to 8590 N.
No, the standard SAI cylinder drifts under load without air pressure. For fail-safe load holding, use the SAIL variant with an air-released lock or the BSAI clamp-lock cylinder.
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