Airtac SAI125 Standard Air Cylinder SAI125BX155
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX155 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 SAI125BX155
The AirTAC SAI125X155 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It provides a robust push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making it well-suited for high-thrust pressing and lifting tasks within its 155 mm stroke. The extruded aluminum barrel design omits tie-rods, offering a clean exterior that simplifies mounting accessory installation.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in humid or washdown environments. It utilizes PT tapered port threads and operates without a magnet. For applications requiring heat resistance, the standard TPU seals can be swapped for Viton (code H) to handle higher ambient temperatures.
Airtac SAI125 Standard Air Cylinder SAI125BX155 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX155 |
|---|---|
| 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 SAI125BX155
| 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 SAI125BX155 Is Used
Heavy-Duty Stamping
Applies 6136 N of thrust at 0.5 MPa for deforming or stamping thick metal components in automated fabrication cells.
Injection Mold Ejection
Utilizes the SUS304 rod to safely eject finished parts from humid molding environments without risking surface corrosion.
Pallet Lifting
Lifts heavy palletized goods vertically within a 155 mm travel range, relying on robust 125 mm bore power.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX155 the Right Cylinder?
Select this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but you want to avoid the larger footprint and air consumption of a 160 mm bore. The 155 mm stroke is ideal for moderate travel distances without requiring extensive physical space.
Because the stroke is under 300 mm, side-load stress on the rod bearing is minimal compared to longer extensions. However, remember that standard adjustable air cushions only decelerate the piston at end-of-stroke; they do not hold a load. If your application requires mid-stroke position holding upon air loss, integrate an external pilot-operated check valve or select the SAIL locking variant. As a true ISO 15552 cylinder, it serves as a drop-in replacement for other standard profile cylinders with matching 125 mm bores, 155 mm strokes, G1/2 ports, and compatible FA or LB mounting accessories.
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 SAI125BX155 FAQ
At an operating pressure of 0.5 MPa, 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 SAI125X155 is dimensionally interchangeable per ISO 15552. You can use it as a drop-in replacement for other ISO 15552 profile cylinders with matching 125 mm bore, 155 mm stroke, G1/2 ports, and identical mounting interfaces.
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