Airtac SAI125 Standard Air Cylinder SAI125BX50
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX50
The AirTAC SAI125X50 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a substantial push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making the 50 mm stroke ideal for high-impact clamping and pressing operations. Its extruded aluminum barrel design omits traditional tie rods, providing a clean, standardized exterior that drops in seamlessly with other ISO 15552 interfaces.
Built for demanding environments, this specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance. The pneumatic ports utilize a PT tapered thread, and the standard TPU seals handle operating temperatures from -20 to +70 C. For applications requiring end-of-stroke position feedback, the barrel includes sensor grooves on both sides to accommodate CMSE or DMSE switches (requiring the -S magnet option).
Airtac SAI125 Standard Air Cylinder SAI125BX50 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAI125BX50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAI125BX50 Is Used
Heavy-Duty Stamping
Provides the robust 6136 N force needed to form and stamp thick metal components in automated fabrication lines.
Pallet Diverting
Handles heavy product loads by driving high-torque diverting arms on large-scale material handling conveyors.
Industrial Clamping
Secures massive workpieces or molds during machining operations, utilizing the 50 mm stroke for rapid actuation.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX50 the Right Cylinder?
Select this 125 mm bore when a 100 mm bore falls short—its 3927 N push force at 0.5 MPa is significantly eclipsed by the 125 mm's 6136 N. Stepping up further to a 160 mm bore yields 10053 N, which may be overkill for compact machinery. At a 50 mm stroke, side-load stress on the rod bearing is minimal, but engineers should still ensure axial alignment to prevent premature seal wear.
Because it is a double-acting cylinder, air pressure drives both the extend and retract strokes. If your application involves lifting and holding a vertical load without constant air pressure, the standard SAI will drift and drop; you must specify the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock. For drop-in replacements, match the 125 mm bore, 50 mm stroke, PT G1/2 port, and the desired mounting accessory (such as a TC trunnion or FA flange).
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 SAI125BX50 FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. If you increase the operating pressure to 0.7 MPa, the push force rises to 8590 N.
No, the standard SAI cylinder is double-acting and will drift if air pressure is lost. For position holding without live pressure, use the SAIL variant with an air-released lock or an external rod lock.
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