Factory customized round sunflower aluminum extrusion heatsink made of 6063 alloy. Radial fin cylindrical heat sink with black anodizing for LED lighting, power supply, new energy, laser, motor cooling. Various sizes OEM available.

Round sunflower aluminum extrusion heatsink, also widely known as radial fin aluminum cooling barrel, is an integrated thermal management component produced through one-step hot extrusion of premium 6063-T5 aluminum alloy. It earns the name “sunflower” thanks to its unique structure: dozens of thin fins radiate evenly outward from the central circular base, resembling the spreading rays of the sun. As displayed in our product gallery, we maintain a complete range of standard molds with varying outer diameters, fin densities, central mounting hole sizes and internal snap slot layouts. Every specification is molded as a single seamless piece, with no welding joints or assembly gaps, making it far more thermally efficient than split, bolted heat sinks on the market.

Each sunflower heatsink features three core functional sections. The central hub is equipped with a precise center bore for secure installation of heat-generating components, paired with small locking notches around its edge to fasten circuit boards and thermal pads without extra screws. The radial fin array forms wide air flow channels between each fin, maximizing the contact area between metal and ambient air. The outer cylindrical wall acts as both a structural frame and an outer housing for finished devices. Two mainstream surface treatments are available for clients: natural silver anodization that retains the original metallic texture, and black anodizing applied to inner fin surfaces. The black oxide coating greatly improves infrared thermal radiation efficiency while adding strong resistance to oxidation, dust, rain and chemical corrosion, perfectly suiting outdoor and high-temperature working conditions. Additional custom surface finishes, such as sandblasting, powder coating and electrophoretic painting, can be arranged to match brand design requirements.

6063 aluminum alloy has long been the preferred material for industrial cooling profiles due to its balanced comprehensive performance. It delivers reliable thermal conductivity, rapidly drawing heat from central heat sources and distributing it uniformly across all radial fins to avoid localized hot spots. In contrast to copper and cast iron radiators, aluminum reduces overall product weight by roughly 60%, effectively cutting logistics costs and lowering installation pressure for lighting fixtures and electrical machinery. Beyond heat transfer benefits, 6063 alloy offers excellent machinability. Manufacturers can easily cut the heatsink to custom lengths, drill mounting holes, tap threads and complete CNC precision processing, so all dimensional parameters can be adjusted to match unique thermal design plans for different end products.

The symmetrically arranged radial fins exponentially expand the heat exchange surface area. Open gaps between fins enable smooth natural air convection, where cool ambient air flows in, absorbs surface heat and carries waste heat away. For ultra-high-power equipment that generates massive heat, matching cooling fans can be added to create forced airflow through fin channels, drastically boosting cooling capacity. The black anodized inner fin surface further optimizes passive heat radiation, a critical advantage for semi-enclosed and fully sealed equipment where natural air circulation is limited. This dual cooling mechanism of convection and radiation stabilizes component operating temperatures and extends the service life of sensitive electronics.

The seamless outer cylinder serves two essential purposes simultaneously: it acts as the heat dissipation carrier and replaces separate plastic or metal outer casings for finished products. For LED floodlights, industrial power modules and laser equipment, manufacturers no longer need to source extra enclosures, simplifying product assembly structures and reducing overall procurement costs for auxiliary parts. The solid one-piece cylinder also enhances structural rigidity, offering reliable physical protection for internal circuit boards, chips and light sources against impact, vibration and extrusion damage during transportation and operation.

Locking notches distributed around the central hub solve common assembly bottlenecks on mass production lines. Lighting and electronics factories can directly snap LED COB substrates, thermal conductive sheets and power drive boards into these slots without installing small fixing screws. This streamlined design shortens manual assembly time, improves workshop production efficiency and cuts long-term spending on fastener hardware.

The cooling performance of round sunflower aluminum extrusion heatsinks relies on three coordinated heat transfer methods: conduction, convection and radiation. First, thermal conduction transfers heat from heat-generating parts like LED chips, power semiconductors and motor stators into the solid aluminum central hub through tight contact. The uninterrupted single-piece aluminum body spreads heat evenly to every radiating fin, with no thermal resistance caused by welding seams. Second, natural or forced convection removes heat: cool air circulates through fin gaps to absorb surface heat and release it into the surrounding environment. Low-power devices operate stably with fan-free passive cooling, while high-power industrial equipment uses auxiliary fans to strengthen airflow exchange. Third, thermal radiation dissipates residual heat via infrared emission from black anodized fin surfaces, especially valuable for enclosed device environments with limited air flow. Combined, these three cooling processes prevent electronic components from overheating, eliminate performance loss caused by high temperatures, and greatly extend the service lifespan of finished equipment.

This cylindrical sunflower heatsink is the standard cooling solution for all circular high-power LED lamps. It is widely applied to industrial high bay lights for factories and warehouses, outdoor floodlights for plazas and stadiums, municipal street lamps, tower crane construction lights, plant grow lights for agricultural greenhouses, mining explosion-proof lamps and large arena lighting fixtures. Its circular outline perfectly fits round COB light sources, and black anodized inner fins provide an extra light-shielding effect to reduce glare and improve light uniformity.

The heatsink meets cooling demands for high-current switching power supplies, motor drive modules, thyristors, industrial transformers, servo motor stator barrels, solar inverters, household and commercial EV charging piles, energy storage power converters and battery management systems. Stable temperature control avoids thermal drift of circuit parameters, ensuring long-term continuous and safe operation of new energy and industrial electrical devices.

Medium and small-sized sunflower aluminum radiators are customized for low-to-medium power laser heads, industrial heating modules, numerical control equipment control power units and medical optical instruments. The compact radial fin structure delivers consistent passive cooling while fitting strict limited space requirements of precision manufacturing and automated machinery.

Miniature sunflower heat sinks are also used for miniature drive motors, high-speed hair dryers, air blower heating cores and kitchen high-power small appliances, providing lightweight and efficient heat dissipation for compact consumer electronics.

All specifications of round sunflower aluminum extrusion heatsinks support full OEM customization to satisfy diverse industrial thermal design requirements. Clients can adjust outer cylinder diameter, fin quantity, central mounting hole size, finished product length and snap groove layout according to power consumption and thermal calculation data. Available surface treatments include natural silver anodizing, black hard anodizing, sandblasting, matte powder coating and electrophoretic painting. We also provide full deep processing services, including fixed-length precision cutting, tapping, CNC engraving and countersinking, delivering semi-finished heatsinks ready for direct assembly. Our engineering team offers free technical drawing review and thermal performance consultation based on clients’ product parameters.

First, seamless monolithic extrusion eliminates thermal resistance from welding joints, achieving higher heat dissipation efficiency than spliced combined heat sinks. Second, the all-in-one integrated design combines heat dissipation function, equipment outer shell and quick assembly structure, cutting total accessory procurement costs. Third, lightweight 6063 aluminum material reduces overall equipment weight and on-site installation burden. Fourth, flexible full-size customization adapts the product to LED lighting, new energy power electronics, laser equipment, automation machinery and consumer home appliances. Fifth, corrosion-resistant anodized surface treatment