Airtac SAI125 Standard Air Cylinder SAI125X135S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X135S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125X135S
The AirTAC SAI125X135-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N push force at 0.5 MPa, this 125 mm bore unit is built to handle substantial loads. The 135 mm stroke provides the precise extension needed for high-impact operations. As an extruded aluminum profile barrel design, it omits tie-rods for a clean exterior.
This specific configuration includes a standard carbon steel piston rod and a built-in magnet (-S) for seamless integration with CMSE or DMSE reed switches along the dual sensor grooves. It features PT tapered port threads and adjustable air cushions at both ends to decelerate massive loads smoothly. For applications requiring position holding upon air loss, consider the SAIL or BSAI locking variants.
Airtac SAI125 Standard Air Cylinder SAI125X135S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X135S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAI125X135S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAI125X135S Is Used
Heavy-Duty Stamping
Provides the 6136 N force required to actuate large mechanical presses and form thick metal components securely.
Pallet Diverting
Drives robust routing arms on high-mass conveyor lines, using the 135 mm stroke to push heavy pallets onto secondary tracks.
Automotive Assembly
Lifts and positions heavy chassis subframes during automated welding cycles, relying on precise CMSE sensor feedback.
Is the Airtac SAI125 Standard Air Cylinder SAI125X135S the Right Cylinder?
Selecting this 125 mm bore is ideal when 100 mm cylinders (providing 3927 N at 0.5 MPa) lack the necessary thrust, but a 160 mm bore is physically too large. The 135 mm stroke offers ample travel for clamping and lifting tasks. Because the stroke is under 300 mm, side-load stress on the rod bearing is minimal compared to longer extensions, though external guides are always recommended for heavy offset loads.
As a dimensionally interchangeable ISO 15552 cylinder, it serves as a drop-in replacement matching the 125 mm bore, 135 mm stroke, PT G1/2 port, and standard mounting accessories like TC trunnion or FA flange. Note that the adjustable cushion only decelerates the piston at stroke end; it does not lock the load. If pressure drops, the rod will drift unless an external pilot check valve is used.
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 SAI125X135S 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 SAI125X135-S is a true ISO 15552 profile cylinder, making its mounting dimensions a drop-in replacement for other ISO 15552 cylinders of the same bore and stroke. It uses a G1/2 PT port.
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