Airtac SAI125 Standard Air Cylinder SAI125BX250S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX250S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX250S
The AirTAC SAI125X250-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a robust push force of 6136 N at 0.5 MPa and a pull force of 5734 N, making it well-suited for moving substantial masses over a 250 mm stroke. The extruded aluminum barrel omits tie rods, presenting a clean exterior that simplifies mounting and maintenance.
This specific configuration includes a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh or washdown environments. Equipped with a built-in magnet (-S), the barrel features sensor grooves on both sides, allowing seamless integration with CMSE or DMSE reed switches for precise position feedback. Fluid connections use PT tapered threads.
Airtac SAI125 Standard Air Cylinder SAI125BX250S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX250S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAI125BX250S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAI125BX250S Is Used
Heavy Stamping
Provides the high thrust necessary for forming, pressing, and stamping rigid metal components in automotive production lines.
Bulk Material Diverting
Actuates large heavy-duty diverter arms and gates on high-capacity conveyor systems to route pallets or bulk goods.
Clamping Fixtures
Secures substantial workpieces securely within large machining centers and welding fixtures.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX250S the Right Cylinder?
Selecting this 125 mm bore is ideal when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient, yet a larger 160 mm bore (10053 N) would be physically oversized. The 250 mm stroke is a standard length, but the extended reach means the unsupported rod is susceptible to bending under side loads. To prevent premature seal wear and rod-bearing failure, guide the load externally or utilize a guided cylinder mechanism.
As a true ISO 15552 profile cylinder, the SAI125X250-S is dimensionally interchangeable with other ISO 15552 standard actuators. To match this exact unit, specify a 125 mm bore, 250 mm stroke, PT port threading, and a magnet for sensor switches. Note that while adjustable air cushions decelerate the piston at stroke ends, this cylinder will not hold a load if air pressure is lost; use the SAIL variant for pneumatic locking requirements.
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 SAI125BX250S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
Yes. The SAI series is manufactured to ISO 15552 standard dimensions, making it a drop-in replacement for other ISO 15552 profile cylinders with matching 125 mm bore, 250 mm stroke, and mounting interfaces.
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