Airtac SAI125 Standard Air Cylinder SAI125BX500
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX500 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX500
The AirTAC SAI125X500 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 actuator provides the extended 500 mm travel required for large-format indexing and press ejection. The extruded aluminum barrel design omits tie-rods for a clean exterior while maintaining strict dimensional interchangeability with other ISO 15552 cylinders.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in humid or chemically exposed environments. It utilizes PT tapered port threads and lacks a magnet; if position sensing is required, a separate -S magnet variant paired with CMSE or DMSE switches is necessary. Adjustable air cushions at both stroke ends absorb kinetic energy, operating reliably within a 30-500 mm/s speed range.
Airtac SAI125 Standard Air Cylinder SAI125BX500 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX500 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125BX500
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAI125BX500 Is Used
Press Ejection
Provides the high force and 500 mm reach needed to extract heavy stamped parts from large press beds safely.
Automotive Assembly
Drives large-body positioning fixtures and heavy component handling stations requiring robust 125 mm bore thrust.
Bulk Material Diverting
Powers heavy-duty diverter arms on high-capacity packaging lines where substantial side-load resistance is managed by external guides.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX500 the Right Cylinder?
Selecting this 125 mm bore over the adjacent 100 mm size upgrades your thrust from 3927 N to 6136 N at 0.5 MPa, providing the necessary power for high-inertia loads. Because this model features a 500 mm stroke, the extended rod is highly susceptible to bending under side loads. To prevent premature rod-bearing wear, implement an external guide rail or utilize a guided cylinder framework to ensure the load moves purely linearly.
For drop-in ISO 15552 replacements, verify the 125 mm bore, 500 mm stroke, G1/2 port, and required mounting accessory (such as a TC trunnion or CA clevis). Note that this standard SAI variant does not hold its position upon loss of air pressure; if fail-safe load holding is critical for your safety circuit, specify the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variant instead.
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 SAI125BX500 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X500 is a true ISO 15552 profile cylinder. It is dimensionally interchangeable with other ISO 15552 cylinders, provided you match the 500 mm stroke, G1/2 port, and your specific mounting accessory.
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