Airtac SAI125 Standard Air Cylinder SAI125AX425
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX425 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 SAI125AX425
The AirTAC SAI125X425 is a double-acting ISO 15552 profile cylinder built for heavy-duty automation. It generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for moving substantial payloads across its 425 mm stroke. The extruded aluminum barrel omits tie rods to provide a clean, standardized mounting interface that is dimensionally interchangeable per ISO 15552.
This specific configuration features an SUS420J2 stainless steel piston rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. It uses PT tapered port threads and operates without a magnet. For applications requiring position holding without live air pressure, the SAIL variant offers an integrated locking mechanism.
Airtac SAI125 Standard Air Cylinder SAI125AX425 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX425 |
|---|---|
| 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 SAI125AX425
| 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 SAI125AX425 Is Used
Heavy Machinery Forming
Provides the robust 6136 N thrust at 0.5 MPa needed to actuate large forming presses and heavy-duty industrial machinery over a 425 mm travel distance.
Pallet Diverting
Pushes fully loaded pallets along high-throughput material handling lines where lower bore cylinders cannot generate sufficient lateral force.
Automated Welding Clamps
Holds thick steel assemblies firmly in position for robotic welding cells, utilizing the SUS420J2 rod to resist environmental spatter and moisture.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX425 the Right Cylinder?
Choose the 125 mm bore when 80 mm (2513 N at 0.5 MPa) lacks the thrust for high-tonnage tasks, but step up to 160 mm (10053 N at 0.5 MPa) if your system requires moving exceptionally heavy masses. At 425 mm of travel, the unsupported piston rod is susceptible to bending under side loads. Use external guide rails or a guided cylinder carriage to prevent rod-bearing damage and premature seal wear.
To match this cylinder for an ISO 15552 replacement, confirm the 125 mm bore, 425 mm stroke, G1/2 port, and your required mounting accessory (such as TC trunnion or FA flange). Because this unit lacks the -S magnet, you cannot use CMSE or DMSE sensors; specify -S if position detection is needed. Remember that standard air cushions only decelerate the piston at stroke ends and do not act as a brake to hold loads safely when 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 SAI125AX425 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If operated at 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X425 is a true ISO 15552 profile cylinder. Its standardized mounting dimensions make it a drop-in replacement for other ISO 15552 cylinders, provided you match the G1/2 port and 425 mm stroke.
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