Folded Fin

Folded Fin Heatsinks Thermal Solutions

Heat Sinks with Folded Fins.

When it comes to heat sinks, sometimes thinner is better. Folded Fin Heat Sink.

Folded fin heat sinks can have much thinner fins than extruded heatsinks or even bonded fin heat sink assemblies. As a result, they are light and provide good ventilation at a low cost. The most frequent materials used for folded fins are aluminum and copper.
Cooling Source manufacture folded fin heatsinks by bending aluminum or copper sheets. Folded fins come in various sizes. CSI bond the fins to a different base. This heatsink allows the base and the folded fins to be manufactured from different metals.
This can be an excellent choice when your needs require a thin folded fin. Because Cooling Source can make the parts lightweight and with a different material for the base, thus lowering your overall materials and tooling costs.
When there is ducted air, that is, air movement is directed through a duct directly at the heat sink, folded fin heat sinks work well. Fin pitch can be tuned during the production process, resulting in a highly high-performing heat sink with ducted air flow. Furthermore, because the heat sink material is folded, the surface area over which heat can be dissipated can be greatly increased. Heat flux density is high in fold fin heat sinks. The expense of this form of heat sink, including the manufacture and ducting required in your system, is a disadvantage. 

A sequential stamping procedure is used to make folded fins. To make a heat sink, the fins are attached to a base via thermally conductive epoxy, brazing, welding, or other metallurgical bonding. The ability to blend aluminum and copper to adjust the heat sink’s performance to the specific application is a benefit of folded fin heat sinks. Copper can be used for the heat sink base because of its high conductivity, whereas aluminum can be utilized for the heat sink fins because of its light weight and low cost.
If you are not sure that this kind of heatsink is the right choice for your needs, our experts know to help you make the right decision for cost, tooling time, and delivery date.

Some of folded fins heatsinks benefits are:


  • Folded Fin Heatsinks can have fins thinner than 0.010.”
  • Fins can be as high as 1 inch
  • Gaps between fins can be 0.060.”
  • Process of brazing or soldering is performed in vacuum furnaces
  • Low NRE
  • The base and the fins do not have to be the same material
  • Higher aspect ratio than extrusions


Engineering Support

Briefly, as part of design work, our engineers apply advanced 3D modeling. Also, we are using cutting-edge CFD tools to optimize your heat transfer project. In addition, we provide our customers with a complete cooling solution to meet specific requirements in a timely and cost-effective manner.

Also, you can count on our Mechanical Engineers to assist with design change and reduce manufacturing costs.

Our fully equipped lab is available to valid your designs, testing, and inspect.
The CSI team can help you meet tight schedule requirements while focusing on your business’s core competencies.

Also, we stand by, ready to support you from concept to production globally.

We ensure secure facilities, traceability, and document control.

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Call 925.292.1293 or e-mail us today to see what your options are. We feel confident that you will love our products, competitiveness, engineering support, and customer service during the sale and afterward.

Folded in transp

2021 Las Positas Ct, Ste 101
Livermore, CA 94551
Phone: (925) 292-1293
Fax: (925) 292-5061


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Heat pipes, extruded aluminum heatsinks, thermal design.