Airtac SAI125 Standard Air Cylinder SAI125BX800S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX800S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX800S
The AirTAC SAI125X800-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It generates 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa, making it well-suited for moving substantial masses across its 800 mm travel. The extruded aluminum barrel design omits tie rods, providing a clean exterior that drops directly into standard ISO 15552 mounting interfaces.
This specific configuration includes a SUS304 stainless steel piston rod for superior corrosion resistance and a built-in magnet (-S) that enables seamless position detection using CMSE or DMSE series switches in the dual sensor grooves. Fluid ports feature PT tapered threading, and the unit relies on adjustable air cushions at both ends to manage the high kinetic energy of this large bore.
Airtac SAI125 Standard Air Cylinder SAI125BX800S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX800S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAI125BX800S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAI125BX800S Is Used
Heavy Stamping
Provides the robust 6136 N push force at 0.5 MPa required to actuate large mechanical stamping presses and heavy forming dies.
Pallet Transfer
Utilizes the 800 mm stroke to push heavy industrial pallets from primary assembly lines onto secondary packaging conveyors.
Automotive Welding
Leverages the SUS304 stainless steel rod to withstand sparks and spatter while positioning heavy chassis sub-assemblies.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX800S the Right Cylinder?
Choose this 125 mm bore when 100 mm cylinders fall short—stepping up from a 100 mm bore increases your 0.5 MPa push force from 3927 N to 6136 N. If 6136 N is excessive for your payload, dropping to the 100 mm bore saves space and air consumption. For this 800 mm stroke, the extended rod is highly susceptible to bending under side loads; utilizing an external guide rail or a fully guided cylinder variant is strongly recommended to prevent premature rod-bearing wear.
Because this is a standard double-acting actuator, it cannot hold a load if air pressure drops or the valve centers—the piston will drift. If your application requires true position holding without constant live pressure, consider the SAIL variant with an air-released lock or the BSAI bidirectional clamp-lock cylinder. This SAI125X800-S is dimensionally interchangeable per ISO 15552, requiring a 125 mm bore, 800 mm stroke, G1/2 port, and compatible TC or FA mounting accessories.
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 SAI125BX800S FAQ
At a standard 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
Yes, the SAI125X800-S is a true ISO 15552 profile cylinder, making it dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke. This specific unit features G1/2 fluid ports with PT tapered threading.
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