Airtac SAI125 Standard Air Cylinder SAI125BX55S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX55S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX55S
The AirTAC SAI125X55-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty tasks, delivering a push force of 6136 N at 0.5 MPa. Its 55 mm stroke is a made-to-order dimension tailored for short-travel, high-impact movements. As a genuine AirTAC component, it ensures reliable performance in rigorous pneumatic setups.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and a built-in magnet (-S) for seamless integration with CMSE or DMSE sensor switches. The extruded aluminum barrel features dual sensor grooves, while the adjustable air cushions at both ends provide precise end-of-stroke deceleration for massive moving loads.
Airtac SAI125 Standard Air Cylinder SAI125BX55S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX55S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAI125BX55S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAI125BX55S Is Used
Heavy-Duty Pressing
Ideal for short-stroke pressing applications requiring substantial force, utilizing its 6136 N push capability at 0.5 MPa to form or assemble dense materials.
Industrial Clamping
Provides rigid, high-thrust clamping of large workpieces during machining or welding, where the 125 mm bore delivers the necessary holding power.
Stamp Operations
Executes short, powerful stamping movements in automated lines, benefiting from the adjustable air cushions to absorb the shock of sudden impact.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX55S the Right Cylinder?
Select this 125 mm bore when a 100 mm bore (offering 3927 N push force at 0.5 MPa) lacks the necessary thrust for your application. The 55 mm stroke is optimal for compact, high-force clamping or pressing duties. Because this cylinder lacks a locking mechanism, it cannot hold a load if air pressure drops; for dead-end holding, consider the SAIL variant or an external pilot-operated check valve.
To replace an existing actuator, match the 125 mm bore, 55 mm stroke, PT G1/2 port, and mounting accessory. The integrated magnet (-S) allows for exact position sensing. For side-load management, ensure external guiding if the load is not perfectly axial.
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 SAI125BX55S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 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, it is built to the ISO 15552 standard, making its mounting dimensions interchangeable with other ISO 15552 profile cylinders. Ensure you match the G1/2 port, 125 mm bore, and 55 mm stroke.
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