Airtac SAI125 Standard Air Cylinder SAI125BX40S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX40S
The AirTAC SAI125X40-S is a double-acting ISO 15552 profile cylinder engineered for heavy-duty operations, delivering a push force of 6136 N at 0.5 MPa. Its short 40 mm stroke makes it exceptionally well-suited for high-force clamping, riveting, and pressing tasks where compact end-of-travel positioning is required. As a genuine AirTAC component, it ensures reliable performance in demanding industrial environments.
This specific configuration includes a SUS304 stainless steel rod (material code B) for superior corrosion resistance, a built-in magnet for use with CMSE or DMSE sensor switches, and PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, while adjustable air cushions at both ends absorb impact to extend operational lifespan.
Airtac SAI125 Standard Air Cylinder SAI125BX40S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAI125BX40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAI125BX40S Is Used
Heavy-Duty Clamping
Provides immense 6136 N clamping force at 0.5 MPa to secure heavy steel fabrication workpieces during welding or machining operations.
Short-Stroke Pressing
Ideal for riveting or press-fitting bearings and pins, utilizing its rigid 40 mm stroke to deliver precise, high-impact force without excessive length.
Industrial Forming
Excels in metal bending and light stamping stations where a compact footprint is necessary but substantial thrust is required to form materials.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX40S the Right Cylinder?
Select this 125 mm bore model when your application demands significantly more force than a 100 mm cylinder (which provides 3927 N at 0.5 MPa) but still requires a minimal stroke. For applications needing even higher thrust, stepping up to the 160 mm bore yields 10053 N at 0.5 MPa. Because the stroke is only 40 mm, side-load stress on the rod bearing is naturally minimized compared to longer strokes.
This cylinder is dimensionally interchangeable per ISO 15552, serving as a drop-in replacement for other ISO 15552 profile cylinders. To match your existing setup, specify the PT port thread, choose from mounting accessories like FA flange or TC trunnion, and ensure you order the -S magnet option if position sensing is required. Note that this standard SAI does not hold its load if air pressure drops; for fail-safe locking, consider the SAIL or BSAI variants.
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 SAI125BX40S FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If pressure is increased to 0.7 MPa, the push force reaches 8590 N.
Yes, the SAI125X40-S is a true ISO 15552 profile cylinder, making its mounting interface and dimensions interchangeable with other ISO 15552 compliant cylinders. You must ensure your setup matches the PT port threads and utilizes the -S magnet option if sensors are used.
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