Airtac SAI125 Standard Air Cylinder SAI125BX425
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX425 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX425
The AirTAC SAI125X425 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty automation. Delivering a robust 6136 N of push force at 0.5 MPa, this 125 mm bore unit is built to handle substantial payloads across its 425 mm stroke. The extruded aluminum barrel design omits tie-rods, providing a clean exterior that simplifies mounting and sensor placement.
This specific configuration incorporates a SUS304 stainless steel piston rod (material code B) for superior corrosion resistance in harsh environments. It utilizes PT tapered port threads and operates without a magnet. If your application requires end-position sensing, you would need to specify the -S option to equip the cylinder with a magnetic piston for CMSE or DMSE switches.
Airtac SAI125 Standard Air Cylinder SAI125BX425 Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX425 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAI125BX425
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAI125BX425 Is Used
Heavy Metal Forming
Provides the high clamping thrust required to secure heavy steel plates during stamping and pressing operations.
Large Injection Molds
Actuates sizable mold halves and heavy tooling assemblies in automotive plastics manufacturing facilities.
Pallet Diverters
Drives robust routing arms to redirect fully loaded pallets along high-capacity material handling lines.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX425 the Right Cylinder?
Selecting this 125 mm bore is appropriate when 100 mm cylinders (providing 3927 N at 0.5 MPa) lack the necessary thrust, but an 80 mm bore (2513 N) is drastically undersized. Operating at a maximum speed of 30-500 mm/s, the SAI125X425 provides controlled, high-force linear motion.
Because this model features a 425 mm stroke, the extended rod is susceptible to bending under side loads. Implement an external guide rail or use a guided cylinder to prevent premature rod-bearing wear. Furthermore, standard double-acting cylinders cannot hold a load if air pressure drops; for fail-safe holding, integrate an external pilot-operated check valve or select the BSAI clamp-lock variant. As a dimensionally interchangeable ISO 15552 unit, it serves as a drop-in replacement matching the 125 mm bore, 425 mm stroke, G1/2 port, and standard mounting accessories.
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 SAI125BX425 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force reaches 8590 N.
Yes, the SAI125X425 is dimensionally interchangeable per ISO 15552. You can drop it in as a replacement for other ISO 15552 cylinders with a 125 mm bore, 425 mm stroke, and G1/2 port, provided your mounting accessories match.
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