Airtac SAI125 Standard Air Cylinder SAI125BX650
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX650 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX650
The AirTAC SAI125X650 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 moving substantial masses over its 650 mm travel distance. The extruded aluminum barrel design omits tie rods, providing a clean exterior that resists contamination in demanding industrial environments.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in humid or chemically exposed settings. It utilizes PT tapered port threads for reliable, leak-free pneumatic connections. Because this model lacks a built-in magnet, external reed or solid-state switches cannot be mounted directly in the barrel grooves; position sensing must be handled externally if required.
Airtac SAI125 Standard Air Cylinder SAI125BX650 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX650 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAI125BX650
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAI125BX650 Is Used
Heavy-Duty Stamping
Provides the 6136 N push force at 0.5 MPa required to actuate large mechanical presses and form heavy-gauge metal components over a 650 mm travel.
Automotive Assembly
Ideal for positioning large chassis subframes or drivetrain modules, where the SUS304 stainless rod resists degradation from cutting fluids and shop moisture.
Pallet Diverting
Handles the lateral redirection of heavy-loaded pallets on high-mass conveyor lines, utilizing the adjustable end cushions to safely decelerate shifting loads.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX650 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires forces between the 3927 N push of a 100 mm bore and the 10053 N output of a 160 mm bore at 0.5 MPa. The 650 mm stroke is well within the 1500 mm maximum standard stroke for this bore size, ensuring standard manufacturing lead times. Operating speed ranges from 30-500 mm/s, which is typical for larger pneumatic actuators managing heavier inertial loads.
At 650 mm of travel, the unsupported piston rod is highly susceptible to bending under side loads, which can rapidly wear the rod bearing and seals. Implement an external linear guide rail or use a guided cylinder mechanism to absorb lateral forces. Furthermore, this standard double-acting cylinder will drift and drop its load if air pressure is lost or exhausted; for critical fail-safe holding, integrate an external pilot-operated check valve or specify the SAIL or BSAI locking variant instead. As a true ISO 15552 profile cylinder, it serves as a dimensionally interchangeable drop-in replacement for other ISO 15552 cylinders, matching standard mounting footprints like the CA clevis 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 SAI125BX650 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 SAI125X650 is a genuine ISO 15552 profile cylinder, meaning its mounting dimensions for accessories like FA flanges and TC trunnions are fully interchangeable with other standard ISO 15552 cylinders of the same bore size.
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