Airtac SAI125 Standard Air Cylinder SAI125BX50S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX50S
The AirTAC SAI125X50-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N of push force at 0.5 MPa, this 125 mm bore unit provides immense thrust within a compact 50 mm stroke. The extruded aluminum barrel design omits tie-rods, ensuring a clean exterior that drops directly into standard ISO 15552 mounting footprints.
This specific configuration includes a -S magnet for direct compatibility with CMSE and DMSE sensor switches, fitting neatly into the dual side grooves. Furthermore, it is built with a SUS304 stainless steel piston rod (material code B), offering superior corrosion resistance for harsh or washdown environments. Standard adjustable air cushions at both ends absorb kinetic energy, while a PT tapered port thread guarantees a reliable pneumatic seal.
Airtac SAI125 Standard Air Cylinder SAI125BX50S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAI125BX50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAI125BX50S Is Used
Heavy-Duty Stamping
Provides the intense 6136 N push force required for deforming or stamping thick metal components in automated fabrication lines.
Industrial Clamping
Secures large molds or heavy workpieces during machining operations, utilizing the SUS304 rod to resist corrosive cutting fluids.
Injection Molding Ejection
Delivers rapid, high-force ejection of dense plastic parts from molds, leveraging the integrated magnet for precise end-of-stroke position confirmation.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX50S the Right Cylinder?
Select this 125 mm bore model when 80 mm bore cylinders (providing 2513 N at 0.5 MPa) lack the necessary power for heavy lifting or pressing tasks. The short 50 mm stroke is optimal for high-force clamping, riveting, or holding applications where minimal extension is required. Because the stroke is well under 300 mm, rod-bearing bending from side loads is minimal, though external guides should still support any off-center loads.
As a standard double-acting cylinder, this SAI model relies on continuous air pressure to maintain its position; it will drift if pressure is lost. For applications requiring strict load holding during exhaust or valve centering, 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, 50 mm stroke, PT G1/2 port, and appropriate mounting accessory like an FA flange or TC trunnion.
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 SAI125BX50S 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 SAI125X50-S is dimensionally interchangeable per ISO 15552 standards. You can drop it into existing footprints matching the 125 mm bore, 50 mm stroke, and G1/2 port size without modifying the machine layout.
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