Airtac SAI125 Standard Air Cylinder SAI125X870S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X870S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 870mm 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
- Stroke870 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X870S
The AirTAC SAI125X870-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a push force of 6136 N at 0.5 MPa, it handles substantial loads with precision. The 870 mm stroke suits extended traverses, and the integrated magnet (-S) enables direct mounting of CMSE or DMSE sensor switches along the extruded aluminum barrel.
Standard configuration includes a durable carbon steel piston rod and PT tapered port threads. For elevated thermal demands, TPU seals can be swapped for Viton (H) options. This model is a dimensionally interchangeable drop-in replacement for other ISO 15552 profile cylinders, ensuring seamless retrofitting without tie-rod interference.
Airtac SAI125 Standard Air Cylinder SAI125X870S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X870S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 870 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 SAI125X870S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×870 | 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 SAI125X870S Is Used
Automotive Stamping
Drives large press buffers and material handling shuttles across extended 870 mm strokes in vehicle assembly lines.
Pallet Transfer
Pushes heavy loaded pallets between machining centers using its robust 6136 N push force at 0.5 MPa.
Large Door Automation
Actuates heavy industrial machine guarding and welding cell doors requiring long reach and high kinetic energy management.
Is the Airtac SAI125 Standard Air Cylinder SAI125X870S the Right Cylinder?
When specifying this unit, verify if the 6136 N thrust at 0.5 MPa is sufficient, or if stepping down to a 100 mm bore (3927 N) is preferable for energy efficiency. Because the 870 mm stroke exceeds 300 mm, long unsupported rods are prone to bending under side loads; utilizing an external guide rail or a fully guided cylinder is critical to prevent premature rod-bearing wear.
This unit utilizes a G1/2 port and an M27x2 rod thread. It does not hold its load upon air loss; for fail-safe holding, consider the SAIL (air-released lock) or BSAI (bidirectional clamp-lock) variants instead of relying on the adjustable end cushions.
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 SAI125X870S FAQ
At 0.5 MPa operating pressure, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125 profile barrel is dimensionally interchangeable per ISO 15552. You can drop it into existing mounting footprints like FA flanges or TC trunnions without modification.
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