Airtac SAI125 Standard Air Cylinder SAI125BX20
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX20
The AirTAC SAI125X20 is a double-acting ISO 15552 profile cylinder engineered for high-force, short-stroke operations. It provides a substantial push force of 6136 N and a pull force of 5734 N at 0.5 MPa, making it ideal for heavy-duty pressing and clamping tasks within confined machinery spaces. This specific configuration features a 20 mm stroke, which is a made-to-order non-standard length designed for ultra-compact actuation.
To withstand demanding environments, this unit is equipped with a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance. It utilizes PT tapered port threads and lacks a standard magnet. For applications requiring position holding without sustained air pressure, consider the SAIL variant with an integrated air-released lock or the BSAI bidirectional clamp-lock cylinder.
Airtac SAI125 Standard Air Cylinder SAI125BX20 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAI125BX20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAI125BX20 Is Used
Heavy-Duty Stamping
Delivers 6136 N of thrust for short-stroke metal forming, riveting, and stamping operations in automated production lines.
Rigid Clamping Systems
Ideal for securing heavy workpieces during machining or welding, utilizing its 125 mm bore and SUS304 rod for robust, corrosion-resistant holding.
Compact Pressing
Fits into tight machine envelopes where a massive 125 mm bore is required for high-force pressing but axial space is strictly limited.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX20 the Right Cylinder?
Selecting this 125 mm bore cylinder is optimal when an application demands high impact force within a minimal stroke envelope. If the 6136 N output at 0.5 MPa exceeds your requirement, stepping down to the 80 mm bore yields 2513 N, saving valuable space and air consumption. Conversely, if higher thrust is necessary, the 160 mm bore offers 10053 N.
Because the stroke is only 20 mm, side-load risks on the rod bearing are minimal compared to longer strokes. However, remember that a standard double-acting cylinder relies on continuous air pressure to maintain its position; if air is lost or exhausted, the piston will drift. For drop-prevention on vertical loads, specify the SAIL or BSAI locking variants. As a genuine ISO 15552 profile cylinder, it serves as a drop-in replacement for any standard 125 mm bore, 20 mm stroke, PT ported cylinder with compatible mounting accessories like FA flanges or TC trunnions.
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 SAI125BX20 FAQ
At an operating pressure of 0.5 MPa, the SAI125X20 generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X20 is a genuine ISO 15552 profile cylinder. It is dimensionally interchangeable with other ISO 15552 cylinders of the same bore and stroke, utilizing standard PT port threads and ISO mounting interfaces.
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