Airtac SAI125 Standard Air Cylinder SAI125BX120
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX120 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX120
The AirTAC SAI125X120 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust push force of 6136 N at 0.5 MPa, this 125mm bore unit utilizes a 120mm stroke to power demanding industrial tasks. Its extruded aluminum barrel design omits tie-rods, providing a clean exterior that simplifies mounting and sensor placement.
This specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. It uses PT tapered port threads and operates without a magnet. If your workflow requires pneumatic locking rather than standard cushioning, the BSAI bidirectional clamp-lock variant is available for this bore size.
Airtac SAI125 Standard Air Cylinder SAI125BX120 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX120 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAI125BX120
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAI125BX120 Is Used
Heavy Stamping
Provides the high impact force needed for forming and stamping thick metal components in automated fabrication lines.
Injection Molding
Actuates heavy molds and clamps large industrial tooling with precise 120mm stroke control and 6136 N output.
Pallet Handling
Drives robust lifting and positioning mechanisms for heavy pallets in high-throughput distribution centers.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX120 the Right Cylinder?
Selecting this 125mm bore makes sense when 80mm cylinders lack the necessary thrust. An 80mm bore yields 2513 N at 0.5 MPa, whereas this SAI125X120 provides 6136 N at the same pressure. Operating at 30-500 mm/s, it balances high power with controlled motion.
For drop-in replacements, ensure the target system matches the ISO 15552 mounting interface, G1/2 port size, and M27x2 rod thread. Because this standard cylinder relies on adjustable air cushions to decelerate the piston, it cannot hold a load if air pressure drops. Use the SAIL variant for pneumatic locking requirements. This 120mm stroke is well below the 300mm threshold, so side-load stress on the rod bearing is minimal.
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 SAI125BX120 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X120 adheres strictly to ISO 15552 dimensional standards. It serves as a drop-in replacement for other ISO 15552 profile cylinders, provided your setup accommodates the G1/2 port and M27x2 rod thread.
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