Airtac SAI125 Standard Air Cylinder SAI125X850S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X850S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X850S
The AirTAC SAI125X850-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore unit is built to handle substantial payloads across its 850 mm stroke. The extruded aluminum barrel omits tie rods, presenting a clean exterior that drops directly into existing ISO 15552 mounting interfaces.
This specific configuration includes a standard carbon steel piston rod and a built-in magnet for position sensing. The magnet enables seamless integration with CMSE or DMSE reed switches along the dual sensor grooves. Operating at speeds of 30-500 mm/s, it features adjustable air cushions at both ends to manage impact deceleration.
Airtac SAI125 Standard Air Cylinder SAI125X850S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X850S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAI125X850S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAI125X850S Is Used
Pallet Handling
Provides the robust 6136 N thrust needed to index heavy pallets over an 850 mm travel distance during automated packaging line transfers.
Heavy Press Feed
Actuates large gating arms or feed pushers in metal forming presses, utilizing the adjustable cushions to absorb high kinetic energy.
Multi-Tier Elevation
Lifts loaded material trays between conveyor tiers, relying on the magnet and CMSE sensors to verify upper and lower positions.
Is the Airtac SAI125 Standard Air Cylinder SAI125X850S the Right Cylinder?
Selecting this 125 mm bore makes sense when 100 mm (3927 N at 0.5 MPa) lacks the necessary thrust, but stepping up to a 160 mm bore (10053 N at 0.5 MPa) would be excessive overkill. At 850 mm of stroke, the unsupported length is significant; side loads will cause rod-bearing bending and premature wear. To manage this, implement an external guide rail or utilize a fully guided cylinder to prevent torsional and lateral stress.
Ensure your setup uses PT tapered port threads for the G1/2 connections and pairs the -S magnet option with appropriate CMSE/DMSE switches. Because the standard SAI lacks a physical lock, it cannot hold loads if air pressure drops or the valve centers. For suspended loads requiring fail-safe holding, specify the SAIL variant with an air-released lock or use an external pilot-operated check valve.
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 SAI125X850S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder 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 SAI series is dimensionally interchangeable per ISO 15552 standards. You can drop it into existing mounting footprints and use standard FA, FB, or TC accessories without modifying the machinery.
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