Airtac SAI125 Standard Air Cylinder SAI125AX155
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX155 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 SAI125AX155
The AirTAC SAI125X155 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty pneumatic tasks, delivering a substantial push force of 6136 N at 0.5 MPa. Its 155 mm stroke is well-suited for high-thrust pressing, lifting, and clamping operations that require significant linear motion. The extruded aluminum barrel design omits traditional tie-rods, providing a sleek, durable structure that drops directly into existing ISO 15552 mounting layouts.
This specific configuration features a SUS420J2 stainless steel piston rod (material code A), offering excellent resistance to corrosion and surface wear in harsh industrial environments. It utilizes a PT tapered port thread and includes adjustable air cushions at both ends to decelerate the heavy 125 mm piston smoothly. Because no magnet is specified, it operates without positional sensing out of the box.
Airtac SAI125 Standard Air Cylinder SAI125AX155 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX155 |
|---|---|
| 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 SAI125AX155
| 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 SAI125AX155 Is Used
Heavy-Duty Stamping
Provides the robust 6136 N thrust required for pressing bearings, stamping metal components, or forming heavy-gauge materials in automated production lines.
Pallet Lifting
Ideal for lifting heavy industrial pallets or molds, where the 155 mm stroke offers the precise vertical travel needed to clear machine bases.
Industrial Clamping
Secures large workpieces during CNC machining or heavy welding, utilizing the full pull force of 5734 N at 0.5 MPa to prevent unwanted part movement.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX155 the Right Cylinder?
Selecting this 125 mm bore provides a massive 6136 N push force at 0.5 MPa, which is ideal if the neighboring 100 mm bore (3927 N at 0.5 MPa) falls short of your load requirements. If your application does not demand this level of thrust, stepping down to the 100 mm option can save air consumption and cycle time.
For a 155 mm stroke, side-load stress on the rod bearing is minimal, but you should still ensure proper alignment to prevent premature seal wear. Note that the standard SAI does not hold a load when air pressure is removed; if your system needs fail-safe position holding, consider the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock cylinder. To replace an existing unit, match the 125 mm bore, 155 mm stroke, PT G1/2 port, and choose appropriate ISO 15552 mounting accessories like TC trunnion or FA flange.
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 SAI125AX155 FAQ
At a standard operating pressure of 0.5 MPa, the SAI125X155 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 SAI125X155 is a genuine ISO 15552 profile cylinder, making its mounting interface dimensionally interchangeable with other ISO 15552 standard cylinders. Ensure your existing setup matches the PT G1/2 port and 155 mm stroke.
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