Airtac SAI125 Standard Air Cylinder SAI125X135
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125X135 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 SAI125X135
The AirTAC SAI125X135 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 handles substantial loads with precision. The 135 mm stroke provides the exact extension needed for high-force clamping and pressing operations.
This model features a standard carbon steel piston rod and utilizes a PT tapered port thread. Because it lacks the -S magnet option, position sensing requires external mechanical switches rather than the integrated sensor grooves. For applications requiring position holding without continuous air pressure, the SAIL variant provides a mechanical lock.
Airtac SAI125 Standard Air Cylinder SAI125X135 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125X135 |
|---|---|
| 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 SAI125X135
| 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 SAI125X135 Is Used
Heavy-Duty Stamping
Provides the 6136 N force at 0.5 MPa required to form and stamp thick metal components in automated fabrication lines.
Injection Mold Ejection
Delivers reliable, high-thrust ejection of dense molded parts, utilizing the 135 mm stroke to clear the press bed safely.
Pallet Clamping
Secures heavy pallets or fixtures during machining or wrapping operations where a robust 125 mm bore is necessary.
Is the Airtac SAI125 Standard Air Cylinder SAI125X135 the Right Cylinder?
Select this 125 mm bore when 80 mm cylinders (providing 2513 N at 0.5 MPa) lack the necessary thrust. If 6136 N is excessive for your payload, stepping down prevents wasted energy. As an ISO 15552 profile cylinder, it serves as a drop-in replacement for other standard cylinders of the same bore and stroke, matching the PT port and standardized mounting accessories.
Because the 135 mm stroke is under the 300 mm threshold, side-load stress on the rod bearing is minimal compared to longer extensions. However, if your application demands positive holding during air loss, avoid relying on the air cushion—it only decelerates the piston at stroke end. Instead, specify the BSAI clamp-lock or SAIL locking variant.
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 SAI125X135 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes. The SAI125X125 is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement for other ISO 15552 profile cylinders with the same 125 mm bore, 135 mm stroke, and PT port configuration.
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