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Extrusion Heat Sinks: Unleash Custom Designs with Linear Freedom

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What is an Aluminum Extrusion Heat Sink?

An aluminum extrusion heat sink is a high-efficiency cooling component created by forcing heated aluminum billets (typically 6063 or 6061 alloy) through a precision-engineered steel die. This process creates a constant cross-sectional profile with extended surface areas (fins) designed to dissipate heat from electronic components into the surrounding air.

At Jindu, we elevate this standard process. While conventional extrusions are limited by fin density, our advanced tooling technology enables a High-Aspect Ratio , allowing for more cooling surface in a smaller footprint—critical for high-power applications.


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Why Choose Jindu Extruded Heat Sinks?

Length Customization with Zero Tooling Constraints

Unlike die-cast or forged heat sinks, our extrusion process allows for length variations without the need for expensive new tooling. Whether you need 100mm or 2000mm, we can produce consistent profiles cut precisely to your specifications—ideal for applications requiring linear scalability and minimal material waste.

Complex Cross-Sectional Geometries for Enhanced Surface Area

Our advanced extrusion capabilities enable the creation of intricate fin designs, multi-layer structures, and asymmetrical profiles that maximize surface area for improved convective heat transfer. From low-profile designs to tall, high-density fin arrays, we deliver geometries that optimize thermal performance in constrained environments.

Full In-House Post-Extrusion Fabrication

Eliminate the hassle of multi-supplier coordination. We offer complete secondary operations including CNC precision machining, drilling, tapping, milling, and deburring to ensure quality control and faster turnaround.

Rapid Prototyping & Flexible Production Volumes

We understand that product development cycles demand speed. Our low minimum order quantities (MOQs) allow you to prototype and validate designs without committing to mass production. Once validated, we scale seamlessly to high-volume manufacturing with consistent repeatability and short lead times.

Metallurgical Expertise in High-Thermal-Conductivity Alloys

With decades of experience in aluminum extrusion, we specialize in 6000-series alloys including 6063, 6061. We help you select the optimal alloy and temper (T5 or T6) to balance mechanical strength, thermal conductivity (170–210 W/m·K), and corrosion resistance—ensuring your heat sink performs reliably under real-world operating conditions.

Our Professional Manufacturing Workflow

We use thermal simulation to optimize fin geometry and metal flow before the H13 steel die is cut.

Aluminum is heated to 480-520°C and extruded under high pressure, followed by online quenching to reach ≥75HB hardness.

Hydraulic stretching ensures a straightness of ≤1mm/m, followed by artificial aging (T5/T6) to lock in mechanical strength.

Over 30 sets of CNC machines handle complex milling, drilling, and tapping for high-precision interface requirements.

Every unit undergoes 100% critical dimension checks via CMM and thermal performance verification.

Technical Specification Matrix

Feature   Jindu Capability   Control Standard  
Material State   6063/6061-T5/T6 Spectral Analysis & Hardness Testing
Fin Height-to-Gap Ratio   8:1 (Standard) up to 12:1 (Limit) High-Precision Die Control
CNC Precision  ±0.01 mm  ±0.01 CMM (Coordinate Measuring Machine)
Flatness (Mounting)   ≤ 0.05 mm  ≤ 0.05 Marble Platform & Dial Indicator
Hardness   ≥ 75 HB (6063-T5)  ≥ 75 HB（6063-T5） Brinell Hardness Tester
Corrosion Resistance   ≥ 48h – 72h Salt Spray NSS (Neutral Salt Spray) Test

Applications of FSW Liquid Cooling

Our Friction Stir Welded plates are the preferred choice for high-heat-flux applications:

Telecommunications & 5G Infrastructure

Extruded aluminum heat sinks provide the reliable passive cooling essential for 5G macro base stations and remote radio units operating in outdoor environments. The extrusion process enables high aspect ratio fins up to 16:1 that maximize natural convection surface area without relying on fans. Seamless profiles up to 2 meters accommodate various equipment sizes while eliminating thermal interface losses from joined sections. Hard anodized finishes deliver exceptional UV resistance and salt spray protection, ensuring 10+ years of maintenance-free service in harsh outdoor conditions.

New Energy Vehicles (EV/HEV)

Electric vehicle power electronics demand cooling solutions that combine light weight with exceptional thermal performance. Extruded heat sinks in 6063-T6 aluminum alloy deliver the optimal strength-to-weight ratio for on-board chargers, DC-DC converters, and traction inverters. Post-extrusion CNC machining achieves mounting surface flatness of ≤0.05mm, ensuring perfect thermal contact with IGBT modules during rapid charging. Integrated mounting bosses and channels, extruded directly into the profile, reduce component count and eliminate potential failure points from vibration.


Power Electronics & Renewable Energy

Solar inverters and wind power converters require continuous, reliable cooling in outdoor installations where downtime is unacceptable. Extruded heat sinks feature thick base plates from 8-20mm that spread concentrated heat laterally before transferring it to tall, widely spaced fins optimized for natural convection. For ultra-high power densities, copper heat pipes can be embedded into extruded aluminum bases using vacuum reflow soldering, achieving effective thermal conductivity thousands of times higher than solid metal while maintaining extrusion economy.

Industrial Automation & Robotics

Servo drives, PLC controllers, and industrial PCs benefit from extruded profiles that serve both structural and thermal functions. Complex multi-chamber extrusions integrate heat sink fins with T-slots, cable channels, and sealed compartments in a single piece, eliminating separate brackets and reducing assembly costs. This design-for-manufacturing approach ensures consistent dimensional accuracy across production runs while creating compact enclosures that withstand continuous industrial operation.

Medical & Laboratory Equipment

MRI scanners, surgical laser systems, and diagnostic instruments demand silent cooling with zero electromagnetic interference. Extruded aluminum heat sinks provide inherent EMI/RFI shielding while enabling completely passive thermal management without fans. Precision CNC machining achieves ±0.01mm tolerances for critical component mounting, while specialized surface sealing prevents outgassing and particle shedding required for cleanroom environments. The result is reliable, silent operation in patient care settings.

Enterprise Computing & Data Centers

Edge computing servers and high-performance storage arrays require maximum cooling within tight airflow envelopes. Extruded heat sinks with variable fin thickness and optimized spacing balance heat dissipation against minimal pressure drop, working efficiently with available fan static pressure. Custom widths match standard server rack dimensions, while thermal simulation-optimized fin pitches from 2.5-8mm accommodate different airflow velocities. The result is lightweight, cost-effective cooling that maximizes processing power in dense computing environments.

FAQ Section

We operate presses ranging from 800 to 2500 tons, capable of producing aluminum profiles with a circumscribed circle diameter of up to φ300mm.

Standard extrusion is often limited, but Jindu utilizes specialized die lubrication and low-speed extrusion (0.5-2m/min) to achieve 12:1 fin ratios, which is ideal for forced-air cooling.

We use specialized fixtures with controlled clamping pressure (≤1MPa) and symmetrical layered cutting techniques to release internal stress and maintain a flatness of ≤0.05mm.

For superior protection, we recommend Hard Anodizing (30-50μm). Our products are tested in salt spray chambers for over 48 hours to meet industrial anti-corrosion standards.

For new designs, die fabrication takes 10-15 days. Once the die is ready, mass production typically takes 14-25 days, with a 3-7 day "Green Channel" available for rapid prototyping.

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