Airtac SAI125 Standard Air Cylinder SAI125X650
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X650 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 SAI125X650
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 stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that resists contamination.
This configuration features a standard carbon steel piston rod and PT tapered port threads. To support high-temperature environments up to 70 C, the standard TPU seals can be swapped for Viton (H) or NBR (N) elastomers. For applications requiring position feedback, the barrel includes dual-sided sensor grooves compatible with CMSE or DMSE switches when a magnet (-S) is specified.
Airtac SAI125 Standard Air Cylinder SAI125X650 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X650 |
|---|---|
| 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 SAI125X650
| 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 SAI125X650 Is Used
Heavy Stamping
Provides the 6136 N push force required to drive heavy metal forming and stamping presses over a long 650 mm travel distance.
Pallet Diverting
Ideal for diverting large, loaded pallets on conveyor lines where the 125 mm bore thrust and long stroke are necessary for actuation.
Large Clamp Fixtures
Secures oversized workpieces in machining centers, utilizing the 5734 N pull force to hold components firmly during aggressive cutting operations.
Is the Airtac SAI125 Standard Air Cylinder SAI125X650 the Right Cylinder?
Selecting this 125 mm bore is ideal when 100 mm bore (3927 N at 0.5 MPa) lacks the thrust for your heaviest actuators, or when a 160 mm bore (10053 N) would be physically oversized. Because this model features a 650 mm stroke, the extended rod is highly susceptible to bending under side loads. Mounting external guide rails or selecting a guided cylinder is strongly recommended to prevent premature rod-bearing wear.
As a true ISO 15552 profile cylinder, this unit is dimensionally interchangeable with other ISO 15552 cylinders, allowing a seamless drop-in replacement using existing FA, FB, or TC mounting accessories. Note that a plain SAI cylinder will drift and drop its load if air pressure is lost; for fail-safe load holding, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant instead of relying on the end-of-stroke air cushions.
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 SAI125X650 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. If higher pressure is available, it can achieve a push force of 8590 N at 0.7 MPa.
Yes, it is dimensionally interchangeable per ISO 15552 standards. However, the standard air cushion only decelerates the piston; it does not hold a load. For position holding without air pressure, use the SAIL lock variant or an external rod lock.
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