Airtac SAI125 Standard Air Cylinder SAI125AX85S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125AX85S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125AX85S
The AirTAC SAI125X85-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. It delivers a robust 6136 N push force at 0.5 MPa, making it highly capable of moving substantial masses. The 85 mm stroke provides the precise shorter-trroke motion needed for clamping or holding large components.
Built with a SUS420J2 stainless steel piston rod (material code A), this model offers excellent corrosion resistance for demanding environments. The -S suffix indicates an integrated magnet, allowing seamless operation with CMSE and DMSE sensor switches fitted into the dual grooves on the extruded aluminum barrel. It uses PT tapered port threads and operates at speeds of 30-500 mm/s.
Airtac SAI125 Standard Air Cylinder SAI125AX85S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125AX85S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAI125AX85S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAI125AX85S Is Used
Heavy-Duty Stamping
Provides the high 6136 N thrust required to form and stamp thick metal panels in automated fabrication lines.
Large Component Clamping
Uses the 85 mm stroke to securely grip oversized workpieces during machining or welding operations.
Pallet Diverting
Handles heavy pallets on assembly lines by providing robust actuation for diverting gates and lifting mechanisms.
Is the Airtac SAI125 Standard Air Cylinder SAI125AX85S the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when a 100 mm bore (offering 3927 N at 0.5 MPa) cannot generate enough thrust, but you want to avoid stepping up to a 160 mm unit. The 85 mm stroke is a custom intermediate length, ideal when standard 75 mm or 100 mm options do not fit your specific mechanical envelope.
As a true ISO 15552 profile cylinder, it serves as a drop-in replacement for any standard ISO 15552 unit when matching the 125 mm bore, 85 mm stroke, PT G1/2 port, and desired mounting accessory (like a TC trunnion or FA flange). Note that the adjustable air cushions decelerate the piston at end-of-stroke but do not lock the load; if your application requires position holding without live air pressure, consider the SAIL variant with an air-released lock or a BSAI clamp-lock cylinder.
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 SAI125AX85S FAQ
At a 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. You can drop it in as a replacement by matching the 125 mm bore, 85 mm stroke, and mounting interface, provided you use the correct PT G1/2 port fittings.
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