Airtac SAI125 Standard Air Cylinder SAI125BX900S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX900S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX900S
The AirTAC SAI125X900-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a push force of 6136 N and a pull force of 5734 N at 0.5 MPa, it handles substantial loads with precision. The 900 mm stroke provides extensive travel for material handling and large press operations. As a standardized profile barrel design, it offers drop-in dimensional interchangeability with other ISO 15552 cylinders without relying on external tie rods.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance in harsh environments. It is equipped with PT tapered port threads and features a built-in magnet (-S) for direct mounting of CMSE or DMSE sensor switches along the dual-side barrel grooves. For applications requiring position holding without continuous air pressure, consider pairing this actuator with the SAIL air-released lock variant.
Airtac SAI125 Standard Air Cylinder SAI125BX900S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX900S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAI125BX900S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAI125BX900S Is Used
Large Press Feeding
Provides the 6136 N push force needed to drive heavy metal blanks into large forming presses over a 900 mm travel distance.
Pallet Diversion
Extends across wide conveyor lines to reroute heavy pallets, utilizing the SUS304 rod to withstand mildly corrosive industrial washdowns.
Heavy Component Lift
Raises substantial machinery components during assembly, relying on the dual adjustable cushions to safely stop the 900 mm stroke without impact.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX900S the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when 80 mm bore cylinders (providing 2513 N push at 0.5 MPa) cannot generate sufficient thrust for heavy lifting. If precise positioning at various stroke lengths is required, the SAIJ adjustable stroke type is a better alternative. Because the 900 mm stroke exceeds 300 mm, the unsupported rod is highly susceptible to bending under side loads; always use an external guide rail or a guided cylinder to prevent premature rod-bearing wear.
This model features a G1/2 port, an M27x2 rod thread, and 40 mm adjustable air cushions at both ends to decelerate the piston smoothly. Note that the standard SAI does not hold its load when air pressure is exhausted; a drop-prevention mechanism like the BSAI bidirectional clamp-lock is required for vertical safety. To match this unit for ISO 15552 replacement, verify the 125 mm bore, 900 mm stroke, PT port thread, and the -S magnet requirement.
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 SAI125BX900S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 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 SAI125X900-S is a true ISO 15552 profile cylinder, making it dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke. Ensure your system matches the G1/2 port and M27x2 rod thread.
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