Airtac SAI125 Standard Air Cylinder SAI125BX550
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX550 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX550
The AirTAC SAI125X550 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 drive substantial masses through its 550 mm stroke. The extruded aluminum barrel design integrates adjustable air cushions at both ends to manage kinetic energy effectively.
This specific configuration features a SUS304 stainless steel piston rod for superior corrosion resistance in harsh environments. It utilizes PT tapered port threads, and because no magnet is specified, it operates without sensor detection unless externally monitored. For applications needing multi-position stopping, consider the related SAIJ adjustable-stroke variant.
Airtac SAI125 Standard Air Cylinder SAI125BX550 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX550 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAI125BX550
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAI125BX550 Is Used
Heavy-Duty Stamping
Provides the 6136 N push force required to actuate large mechanical stamping presses and forming dies.
Automotive Assembly
Drives heavy jigs and positions large automotive chassis components reliably along the 550 mm stroke.
Pallet Handling
Indexes heavy loaded pallets on assembly lines, utilizing adjustable cushions to stop massive weights smoothly.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX550 the Right Cylinder?
Selecting this 125 mm bore makes sense when the 80 mm class (3518 N push at 0.5 MPa) is insufficient for your load demands, but you want to avoid stepping up to the massive 160 mm bore. Operating speed is rated at 30-500 mm/s. Because this model lacks a built-in magnet, position sensing requires external methods or adding the -S suffix for CMSE/DMSE sensor compatibility.
At 550 mm of stroke, the unsupported rod length is highly susceptible to bending under side loads. Implement an external guide rail or use a fully guided cylinder to prevent rod-bearing damage. Furthermore, this standard SAI cylinder will drift if air pressure is lost; for fail-safe load holding, integrate an external rod lock or specify the SAIL air-released lock variant. It serves as a dimensionally interchangeable drop-in replacement per ISO 15552 mounting dimensions.
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 SAI125BX550 FAQ
At 0.5 MPa operating pressure, the SAI125X550 delivers 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X550 is a profile cylinder with standardized ISO 15552 mounting dimensions, making it dimensionally interchangeable with other ISO 15552 cylinders. It uses a G1/2 port and M27x2 rod thread.
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