Airtac SAI125 Standard Air Cylinder SAI125X275
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X275 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X275
The AirTAC SAI125X275 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 execute demanding transitions over a 275 mm stroke. The extruded aluminum barrel omits tie-rods, presenting a clean exterior that simplifies mounting and sensor placement.
This model arrives configured with a standard carbon steel piston rod and PT tapered port threading. Because it lacks a magnetic piston, position sensing requires external methods. For elevated thermal environments, the standard TPU seals can be swapped for Viton (H) or NBR (N) alternatives to match specific fluid and temperature demands.
Airtac SAI125 Standard Air Cylinder SAI125X275 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X275 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAI125X275
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAI125X275 Is Used
Heavy Stamping
Provides the necessary 6136 N of thrust to drive heavy metal forming and stamping presses over a 275 mm travel distance.
Material Pressing
Ideal for compacting and pressing dense materials where high kinetic force must be applied consistently across a medium-length stroke.
Pallet Diverting
Actuates robust routing gates on high-mass conveyor lines, easily shifting loaded pallets without stalling.
Is the Airtac SAI125 Standard Air Cylinder SAI125X275 the Right Cylinder?
Generating 6136 N at just 0.5 MPa makes this bore highly effective for heavy lifting. If your application requires less force, stepping down to the 100 mm bore yields 3927 N under the same pressure, optimizing energy consumption. Conversely, moving up to the 160 mm bore provides 10053 N for extreme load requirements. The 275 mm stroke is a standard dimension, falling well within the 1500 mm maximum limit for this size.
Operating at 30-500 mm/s, the SAI125X275 utilizes adjustable air cushions at both ends to decelerate the piston smoothly. Note that these cushions only manage end-of-stroke speed; they do not lock or hold the load. If your machinery loses air pressure, the cylinder will drift. For fail-safe load holding without continuous air supply, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant. As a true ISO 15552 profile cylinder, it mounts interchangeably with any standard 125 mm bore fixture using FA/FB flanges or TC trunnions.
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 SAI125X275 FAQ
At a standard 0.5 MPa operating pressure, the SAI125X275 generates 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
Yes. The SAI125X275 is a genuine ISO 15552 profile cylinder, meaning its mounting dimensions are standardized. It serves as a direct drop-in replacement for any other 125 mm bore ISO 15552 cylinder, provided you match the 275 mm stroke and PT port size.
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