Folded Fin Assemblies

Folded-fin assemblies from Aavid Thermalloy offer maximum cooling surface in minimum volume. Developed for aerospace and military markets, folded-fin heat sinks have found a strong commercial niche. Available in a wide variety of styles, materials and fin densities, folded fins can be used in forced convection and natural convection cooled systems.

Virtually all parts are customized, with very few standard parts available.


  • Lightweight cooling fins
  • Reduced material cost
  • Reduced assembled part weight
  • Minimal material thickness
  • Reduced center-to-center fin spacing, allowing more fins per inch of width
  • Fin heights up to 51 mm (2.0")
  • Minimized mounting base thickness
  • Folded-fin stock can be attached to a mechanical heat spreader with thermally conductive epoxy, brazing, welding, or similar metallurgical bonds

    Design Guidelines

  • Airflow lengths are limited to 610 mm (24") for a single piece
  • Fin densities up to 20 fins per inch, depending on style, material thickness, and height are available
  • Material can be aluminum or copper, with thickness to 0.2 mm (0.006") possible
  • Folded-fin styles include lanced and offset, square crests/trough, and round crest trough
  • Fins can be attached to the heat dissipation surface using either epoxy or braze for aluminum; braze or solder for copper
  • Base material must match fin material, for consistent thermal expansion
  • For any holes or cutouts, fins must be EDM wire cut