Oversized Cast Aluminum Electrical Flange – CNC Machined, Anodized & Insulating Coating | MegaloCast

Oversized Cast Aluminum Electrical Flange – CNC Machined + Anodized + Insulating Coating

MegaloCast produces extra-large aluminum flanges (up to 3500mm OD) for power transmission, substations, GIS equipment and heavy electrical structures. We integrate casting, precision machining and surface insulation in one factory — no sub-supplier handoff.

Manufacturing Route

• Casting: Sand casting / Gravity die casting for large thin-wall aluminum rings

• Material: A356, A380, ADC12 or per drawing

• Machining: Large-format CNC turning & milling, bolt-circle drilling, sealing face facing, concentricity control

• Surface System (dual protection):

  • Anodizing (Type II/III) – corrosion resistance, hard surface

  • Insulating varnish / dielectric coating – electrical isolation for energized environments

  • Optional powder coating as top layer

  
  

Why “Anodize + Insulation Varnish”

Anodizing gives a dense oxide layer; insulating varnish adds a controlled dielectric barrier. Together they fit high-voltage flanges where creepage distance and surface leakage must be managed.

Typical Specs

• Diameter: 1000mm – 3500mm (custom)

• Flatness: per IEC/ANSI drawing

• Coating: Anodize 10–25µm + Varnish 30–80µm (adjustable)

• Test: Dimensional inspection, RT/X-ray on request, coating thickness check

Applications

Substation structures, transformer terminals, GIS/breaker flanges, hollow insulator bases, wind & energy equipment.

Send drawing → we quote casting + machining + finishing as one package.