Airtac SAI125 Standard Air Cylinder SAI125BX135S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX135S 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 SAI125BX135S
The AirTAC SAI125X135-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a substantial push force of 6136 N at 0.5 MPa and 8590 N at 0.7 MPa, this 125 mm bore actuator handles high-impact tasks effortlessly. The 135 mm stroke provides the precise mid-range travel required for clamping, lifting, and pressing heavy assemblies. Its extruded aluminum barrel design omits tie rods, presenting a smooth, compact exterior that resists contamination.
Built to exacting standards, this specific configuration features a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh or washdown environments. It includes a built-in magnet (-S) enabling seamless integration with CMSE and DMSE reed sensors for position feedback. Fluid ports are configured with PT tapered threads, and the standard adjustable air cushions at both ends absorb kinetic energy to minimize end-cap impact wear.
Airtac SAI125 Standard Air Cylinder SAI125BX135S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX135S |
|---|---|
| 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 SAI125BX135S
| 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 SAI125BX135S Is Used
Heavy-Duty Stamping
Provides the robust 8590 N force at 0.7 MPa required for metal forming, stamping, and riveting thick structural components.
Pallet Diversion
Utilizes the integrated magnet and CMSE sensors to confirm stroke endpoints when lifting and diverting heavy loaded pallets on conveyor lines.
Automotive Assembly
Ideal for pressing bearings or lifting engine blocks, where the SUS304 rod offers reliable performance in environments with coolant exposure.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX135S the Right Cylinder?
Selecting this 125 mm bore actuator is optimal when an 80 mm bore cylinder (providing 3518 N push at 0.7 MPa) lacks the necessary thrust for heavy lifting or pressing. If the application requires even higher force, stepping up to a 160 mm bore yields 14074 N at 0.7 MPa. Because this is a 135 mm stroke, side-load stress on the rod bearing is minimal, though external guides should always be used to prevent binding in lifting scenarios.
As a standard double-acting cylinder, the SAI125X135-S relies on continuous air pressure to hold its position; it will drift if pressure is lost or the directional valve is centered. For applications requiring fail-safe load holding, consider the SAIL variant with an air-released lock, or the BSAI bidirectional clamp-lock cylinder. This model is dimensionally interchangeable per ISO 15552, serving as a direct drop-in replacement for other ISO 15552 profile cylinders. Ensure to specify PT port fittings, compatible CMSE/DMSE sensors for the magnet, and appropriate mounting accessories like FA flanges or CA clevises.
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 SAI125BX135S FAQ
At a standard operating pressure of 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, the push force increases to 8590 N and the pull force to 8040 N.
Yes. The SAI125X135-S is a genuine ISO 15552 profile cylinder, making its mounting interface and envelope dimensions fully interchangeable with other ISO 15552 cylinders, though it is an AirTAC brand product.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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