Airtac SAI125 Standard Air Cylinder SAI125BX550S
The AirTAC Airtac SAI125 Standard Air Cylinder SAI125BX550S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAI125 Standard Air Cylinder SAI125BX550S
The AirTAC SAI125X550-S 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 actuator handles substantial workloads with ease. The 550 mm stroke provides ample travel for large-scale indexing and pressing operations. As a genuine AirTAC component, it guarantees reliable performance across demanding industrial environments.
This specific configuration features a SUS304 stainless steel piston rod (material code B), offering superior corrosion resistance for humid or chemically exposed settings. The integrated -S magnet enables seamless position detection using CMSE or DMSE series switches mounted directly into the dual-side sensor grooves on the extruded aluminum barrel. It utilizes PT tapered port threads and includes adjustable air cushions at both ends to smooth out high-mass deceleration.
Airtac SAI125 Standard Air Cylinder SAI125BX550S Technical Specifications
| Model | Airtac SAI125 Standard Air Cylinder SAI125BX550S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAI125BX550S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAI125BX550S Is Used
Heavy-Duty Pressing
Ideal for stamping, riveting, and forming operations where the 6136 N push force at 0.5 MPa is required to securely seat large components.
Pallet Indexing
The 550 mm stroke provides the extended reach needed to shift heavy pallets or workpieces between machining stations on automated transfer lines.
Material Lift Gates
Leverages the SUS304 stainless rod and dual adjustable cushions to reliably raise and lower heavy loading dock gates without impact shock.
Is the Airtac SAI125 Standard Air Cylinder SAI125BX550S the Right Cylinder?
When sizing this actuator, compare its 6136 N output at 0.5 MPa against the smaller 100 mm bore (3927 N) or the larger 160 mm bore (10053 N) to match your exact load requirements. Because this model features a 550 mm stroke, the extended unsupported rod is susceptible to bending under side loads; always pair it with an external linear guide or use a guided cylinder to prevent premature rod-bearing wear. If your machinery must retain a load during a sudden air-pressure loss or valve centering, note that the standard SAI cylinder will drift. For fail-safe holding, specify the SAIL (air-released lock) variant or the BSAI bidirectional clamp-lock cylinder. To ensure a true drop-in replacement, verify the ISO 15552 mounting interface dimensions, the PT G1/2 port size, and your required mounting accessory (such as a TC trunnion or CA clevis) before finalizing the build.
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 SAI125BX550S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
Yes, the SAI125X550-S is dimensionally interchangeable per ISO 15552 profile-barrel standards. Verify your port size (PT G1/2), mounting accessory, and magnet requirements to ensure a seamless drop-in installation.
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