Airtac SAI125 Standard Air Cylinder SAI125BX280
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX280 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX280
The AirTAC SAI125X280 is a double-acting ISO 15552 profile cylinder offering a robust 6136 N push force at 0.5 MPa and 8590 N at 0.7 MPa. Its 280 mm stroke is ideal for heavy-duty positioning tasks requiring substantial travel. The extruded aluminum barrel omits tie-rods, presenting a clean profile that integrates seamlessly into modern automated machinery.
Configured here with a SUS304 stainless steel piston rod (material code B), this variant provides excellent corrosion resistance for humid or chemically exposed environments. It lacks a built-in magnet, so if position feedback is required, external reed or solid-state sensors must be mounted externally rather than in the barrel grooves.
Airtac SAI125 Standard Air Cylinder SAI125BX280 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX280 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAI125BX280
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAI125BX280 Is Used
Heavy Stamping
Provides the high thrust needed for metal forming and stamping presses.
Material Lift
Raises and lowers heavy material pallets in automated fabrication cells.
Pallet Diverting
Actuates heavy-duty lane diverters to sort large industrial totes.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX280 the Right Cylinder?
Select this 125 mm bore when 100 mm (3927 N at 0.5 MPa) is insufficient but the 160 mm bore (10053 N) is oversized. Operating at 0.15-1.0 MPa, the unit features PT tapered port threads and a maximum standard stroke limit of 1500 mm. To achieve true ISO 15552 interchangeability, match the 125 mm bore, 280 mm stroke, G1/2 port, and appropriate mounting accessories like the FA flange or TC trunnion.
Because the stroke is 280 mm, be mindful of side-load induced rod-bearing bending. For applications involving heavy off-center loads, utilize an external guide rail or switch to a guided cylinder variant to prevent premature seal wear. Additionally, this standard cylinder cannot hold a load if air pressure drops; use the SAIL variant with an air-released lock or a BSAI clamp-lock for fail-safe positioning.
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 SAI125BX280 FAQ
The cylinder provides a push force of 6136 N at 0.5 MPa and 8590 N at 0.7 MPa. The pull force at 0.5 MPa is 5734 N.
Yes, the SAI125X280 is dimensionally interchangeable per ISO 15552. You can drop it in to replace other ISO 15552 profile cylinders with a 125 mm bore and 280 mm stroke.
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