Airtac SAI125 Standard Air Cylinder SAI125BX400
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX400 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX400
The AirTAC SAI125X400 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N push force at 0.5 MPa, this 125 mm bore unit is built to manage substantial loads across its 400 mm stroke. The extruded aluminum barrel omits traditional tie-rods, presenting a clean exterior that resists mechanical snagging in dense machine layouts.
This specific configuration incorporates a SUS304 stainless steel piston rod (material code B), providing excellent corrosion resistance for humid or mildly chemically exposed environments. It utilizes PT tapered port threads. Note that because no magnet option (-S) is specified, it cannot directly host CMSE or DMSE electronic sensors without modification.
Airtac SAI125 Standard Air Cylinder SAI125BX400 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX400 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAI125BX400
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAI125BX400 Is Used
Heavy Stamping
Drives large metal forming and stamping presses requiring high kinetic energy and a 6136 N push force at 0.5 MPa.
Bulk Material Diversion
Actuates heavy-duty diverter arms on high-throughput aggregate or mining conveyor lines over a 400 mm reach.
Automotive Assembly
Positions heavy chassis components or sub-assemblies on automotive production lines where robust 125 mm bore force is mandatory.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX400 the Right Cylinder?
Choosing this 125 mm bore makes sense when 100 mm falls short—stepping up from the 100 mm bore yields a significant jump from 3927 N to 6136 N at 0.5 MPa. If the 400 mm stroke exceeds your actual travel requirement, dropping to a 300 mm standard stroke reduces overall envelope size and mechanical wear. At 400 mm of extension, the unsupported rod length is considerable; side loads will induce severe bending stresses on the rod bearing. To prevent premature seal failure and rod scoring, mount an external guide rail or utilize a fully guided cylinder carriage.
As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders from various manufacturers, ensuring a seamless drop-in replacement for your existing 125 mm bore, 400 mm stroke, PT port, and standard mounting accessory footprint. If your application requires the load to be physically held in place during a complete air pressure loss, do not rely on the end-of-stroke air cushions—they only decelerate motion. Instead, specify the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock cylinder.
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 SAI125BX400 FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. If pressure is increased to 0.7 MPa, the push force reaches 8590 N.
Yes, the SAI125X400 is a genuine ISO 15552 profile cylinder. Its standardized mounting interface and PT port locations make it dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke.
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