Airtac SAI125 Standard Air Cylinder SAI125BX185S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX185S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX185S
The AirTAC SAI125X185-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty tasks, delivering a robust 6136 N of push force at 0.5 MPa. Because 185 mm is not a standard catalog length, this unit is produced as a made-to-order stroke to fit specific machinery envelopes.
Configured with a -S magnet, it readily integrates with CMSE and DMSE sensor switches housed in the dual side grooves of the extruded aluminum barrel. Furthermore, this specific build incorporates a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads to ensure a rigid, leak-free pneumatic connection.
Airtac SAI125 Standard Air Cylinder SAI125BX185S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX185S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAI125BX185S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAI125BX185S Is Used
Heavy Metal Stamping
Provides the high impact force necessary for stamping and forming thicker metal sheets in automated fabrication lines.
Large Press Feeding
Actuates robust feeding mechanisms that position heavy raw materials into large industrial presses.
Pallet Ejection
Drives heavy-duty ejection systems to push fully loaded pallets off conveyor lines smoothly.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX185S the Right Cylinder?
Generating 6136 N at 0.5 MPa, this 125 mm bore offers substantial power; if your application requires less force, dropping down to the 80 mm bore yields 2513 N, while the 160 mm bore provides 10053 N for heavier demands. The 185 mm stroke is well below the 300 mm threshold where side-load bending becomes a major concern, but external guides are still recommended for offset loads. Remember that the adjustable air cushions only decelerate the piston at stroke ends; they do not hold a load. If your machinery needs true position holding during a pressure loss, specify the SAIL variant with an air-released lock or the BSAI clamp-lock cylinder. As a dimensionally interchangeable ISO 15552 profile cylinder, it serves as a drop-in replacement matching the 125 mm bore, 185 mm stroke, PT port, and standard mounting accessories like the 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 SAI125BX185S FAQ
At an operating pressure of 0.5 MPa, the 125 mm bore 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 SAI125X185-S is a genuine ISO 15552 profile cylinder, making its mounting interface and envelope dimensions fully interchangeable with other standard ISO 15552 cylinders of the same bore size.
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