Airtac SAI125 Standard Air Cylinder SAI125AX135
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX135 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX135
The AirTAC SAI125X135 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers 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 heavy load transfer over its 135 mm stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that resists mechanical interference.
This specific configuration utilizes an SUS420J2 stainless steel piston rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. Fluid connections use PT tapered threads, and operators can adjust the variable air cushions at both ends to decelerate massive loads smoothly. Note that this unit lacks a magnet; adding the -S option enables dual-side sensor groove compatibility with CMSE or DMSE switches.
Airtac SAI125 Standard Air Cylinder SAI125AX135 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX135 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAI125AX135
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAI125AX135 Is Used
Heavy-Duty Stamping
Provides the 6136 N push force required to form, stamp, or pierce thick metal components in automated fabrication lines.
Injection Mold Ejection
Delivers reliable high-thrust ejection of dense plastic or aluminum castings from heavy industrial molds.
Pallet Diverting
Actuates heavy-duty lane dividers to route loaded pallets weighing several hundred kilograms along material handling conveyors.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX135 the Right Cylinder?
Select this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) cannot meet your force requirements, but a larger 160 mm unit would be physically excessive. The 135 mm stroke provides ample extension for substantial actuation tasks without demanding extreme space. Because the stroke is under 300 mm, rod-bearing bending stress is minimal, though external guides are always recommended if the load is heavy and off-center.
As a true ISO 15552 profile cylinder, the SAI125X135 is dimensionally interchangeable with other ISO 15552 cylinders, serving as a drop-in replacement using standard mounting accessories like LB foot brackets or TC trunnion joints. Remember that a standard double-acting cylinder will drift if air pressure is lost; if your application requires strict position holding without live pressure, consider the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variants instead of relying on the cushion.
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 SAI125AX135 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. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
Yes. The SAI125X135 is built to the ISO 15552 standard (which supersedes ISO 6431 and VDMA 24562), making its mounting dimensions and port locations a direct drop-in replacement for other ISO 15552 profile cylinders.
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