Airtac SAI125 Standard Air Cylinder SAI125BX425S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX425S 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 SAI125BX425S
The AirTAC SAI125X425-S is a double-acting ISO 15552 profile cylinder built for heavy-duty automation. It generates 6136 N of push force at 0.5 MPa, making it highly effective for moving substantial masses along its 425 mm travel distance. As a made-to-order non-standard stroke unit, it fulfills specialized machinery requirements that fall outside standard increments.
This variant is explicitly configured with a SUS304 stainless steel rod for superior corrosion resistance in harsh environments. It includes a piston magnet (-S) for use with CMSE and DMSE reed switches, which mount directly into the dual sensor grooves extruded into the aluminum barrel. The pneumatic supply connects via tapered PT ports, and the standard TPU seals can be upgraded to Viton (H) for high-temperature applications.
Airtac SAI125 Standard Air Cylinder SAI125BX425S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX425S |
|---|---|
| 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 SAI125BX425S
| 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 SAI125BX425S Is Used
Heavy Pressing
Delivers 6136 N of thrust at 0.5 MPa for securely pressing bearings and heavy mechanical components into housings.
Pallet Diversion
Actuates large-scale diverter arms on heavy-duty packaging conveyors, utilizing the full 425 mm stroke to clear wide product lanes.
Injection Molding
Handles robust core pulling sequences on large injection molding machines, where the SUS304 rod withstands residual heat and humidity.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX425S the Right Cylinder?
When specifying this model, verify if the 6136 N thrust at 0.5 MPa is sufficient, or if stepping up to the 160 mm bore (10053 N at 0.5 MPa) is necessary for heavier loads. Conversely, the 100 mm bore offers 3927 N if a smaller footprint is acceptable. Because the 425 mm stroke exceeds the 400 mm standard increment, it is manufactured as a non-standard made-to-order stroke.
At 425 mm of travel, the extended rod is highly susceptible to bending under side loads. To prevent premature rod-bearing wear, use an external guide rail or a fully guided cylinder to absorb lateral forces. Additionally, this standard profile cylinder cannot hold a load if air pressure drops; for fail-safe position holding, integrate the SAIL (air-released lock) or BSAI (clamp-lock) variant. Being dimensionally interchangeable per ISO 15552, it serves as a direct drop-in replacement for other ISO 15552 profile cylinders of the same bore and stroke.
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 SAI125BX425S FAQ
The SAI125X425-S provides 6136 N push force and 5734 N pull force at 0.5 MPa. Its operational speed range is 30-500 mm/s.
Yes, it is a true ISO 15552 profile cylinder, making its mounting interface dimensionally interchangeable with other ISO 15552 standard cylinders of the same 125 mm bore size.
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