Airtac SAI125 Standard Air Cylinder SAI125X425
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X425 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X425
The AirTAC SAI125X425 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 handle substantial loads across its 425 mm stroke. The extruded aluminum barrel omits tie-rods, providing a clean profile that drops directly into standardized ISO 15552 mounting interfaces.
This configuration features a standard carbon steel piston rod and PT tapered port threads. Because it lacks the -S magnet suffix, external position sensing requires mechanical limit switches rather than the CMSE or DMSE reed sensors that fit into the barrel's dual grooves. For applications requiring position holding upon air loss, consider the SAIL pneumatic lock variant.
Airtac SAI125 Standard Air Cylinder SAI125X425 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X425 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAI125X425
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAI125X425 Is Used
Heavy Stamping
Provides the 6136 N push force required to actuate large stamping presses and form heavy-gauge metal components securely.
Injection Molding Extraction
Utilizes the 425 mm stroke to reach deep into injection molding machines and extract large automotive or industrial plastic parts.
Pallet Diverting
Drives heavy-duty pallet diverters on high-throughput packaging lines where substantial side loads demand robust thrust.
Is the Airtac SAI125 Standard Air Cylinder SAI125X425 the Right Cylinder?
Selecting this 125 mm bore is ideal when 80 mm cylinders (providing 2513 N at 0.5 MPa) lack the necessary thrust for high-inertia loads. The 425 mm stroke falls within the standard maximum of 1500 mm for this bore, but at this length, side loads can cause severe rod-bearing bending. Implementing an external guide rail or a guided cylinder carriage is strongly recommended to prevent premature seal wear.
As a true ISO 15552 cylinder, this model ensures dimensional interchangeability with other standard profile cylinders. When replacing a unit, verify the 425 mm stroke, G1/2 port, and mounting accessory (such as TC trunnion or LB foot brackets) to guarantee a seamless fit. Note that standard air cushions only decelerate the piston at end-of-stroke; they do not hold a load if air pressure is removed.
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 SAI125X425 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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, the SAI125X425 is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement for other ISO 15552 profile cylinders, provided your port size (G1/2), stroke, and mounting accessories match.
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