Bonded Fin Heat Sink Manufacturer
Large-format bonded fin heat sinks with high fin density, flexible materials, precision machining, and complete assembly support.
Custom Bonded Fin Heat Sinks for High-Power Cooling
Bonded fin heat sinks are built by inserting individual fins into precisely machined or extruded grooves in a solid base. The fins are secured using a thermally conductive bonding material, creating a strong thermal path between the heat source, base, and cooling fins.
This construction allows taller, thinner, and more closely spaced fins than many conventional extrusion designs. It is especially useful when the required heat sink is too large, too wide, or too thermally demanding for a practical one-piece extrusion.
The base may be manufactured from aluminum or copper, while the fins can use the same or a different material. This flexibility makes bonded fin construction suitable for large power electronics systems where thermal performance, weight, airflow, cost, and manufacturability must be carefully balanced. Bonded or brazed assemblies commonly use a grooved base with separately manufactured fins, allowing a wider range of base and fin geometries than standard extrusion.
Why Choose a Bonded Fin Heat Sink?
High Fin-to-Base Ratio
Individual fins can be considerably taller than the base thickness, providing a large cooling surface within a relatively compact footprint.
Flexible Fin Density
Fin thickness, spacing, height, and airflow direction can be adjusted to match natural convection, fan cooling, or a defined system air duct.
Large Overall Dimensions
Bonded fin construction is well suited to long or wide heat sinks that would be difficult or uneconomical to manufacture as a single extrusion.
Mixed-Material Designs
Copper bases can be combined with lightweight aluminum fins when improved heat spreading is needed without using an all-copper assembly.
Easy System Integration
Fans, shrouds, heat pipes, vapor chambers, mounting rails, power modules, and protective covers can be integrated into the finished assembly.
Typical Technical Options
The following options are general design categories. Final construction depends on the heat load, airflow, dimensions, materials, operating environment, and production quantity.
| Item | Typical Options |
|---|---|
| Construction | Epoxy-bonded fins; brazed construction may be evaluated for selected projects. |
| Base Material | Aluminum or copper |
| Fin Material | Aluminum or copper |
| Base Type | Extruded grooved base or CNC-machined plate |
| Fin Type | Straight plate, folded, serrated, or custom |
| Cooling Mode | Natural convection or forced-air cooling |
| Machining | Milling, drilling, tapping, slots, pockets, flatness machining |
| Surface Finish | Clear/black anodizing, chromate, powder coating, nickel plating |
| Optional Integration | Fans, shrouds, heat pipes, vapor chambers, TIMs, hardware |
Engineering Note:
Individual maximum dimensions and minimum fin spacing may not be achievable in the same design. Send us your drawing for a manufacturability review.
Our Custom Manufacturing Capabilities
At XINXIANG, we manufacture custom bonded fin heat sinks from your drawings, thermal requirements, or existing product samples.
Base and Fin Design
The base can be produced from an extruded profile or a CNC-machined plate. Straight plate fins, folded fins, serrated fins, or application-specific fin structures may be evaluated according to the required surface area and pressure drop.
Aluminum and Copper Options
Common configurations include aluminum bases with aluminum fins, copper bases with copper fins, and hybrid copper-base/aluminum-fin assemblies.
CNC Machining
Available secondary operations include milling, drilling, tapping, counterboring, mounting slots, flatness machining, component pockets, and interface-surface finishing.
Finishing
Aluminum parts can be supplied with clear or black anodizing, chromate conversion coating, powder coating, or other project-specific finishes. Copper components can receive anti-oxidation treatment or nickel plating.
Assembly
Fans, guards, shrouds, thermal interface materials, mounting hardware, and power modules can also be assembled when required.
We help you every step of the way, from drawings to production.
Application Review
Send us your drawing, material preference, quantity, and finish requirement.
Design and DFM
We review fin density, airflow resistance, base spreading, mounting, tolerances, and machining access.
Prototype & Production
Produce samples for dimensional, assembly, and thermal evaluation. Then complete volume production under controlled work instructions once we receive your confirmation.
Inspection and Delivery
Inspect the parts, protect the fins from damage, pack for export, and ship worldwide.
With more than 20 years of heat sink manufacturing experience, XINXIANG supports international OEMs and industrial buyers from early design review through repeat production. Our 6,000 m² facility combines multiple thermal manufacturing processes with CNC machining, finishing, inspection, assembly, and export packaging.
Typical Applications
Common Questions from Our Clients
How long does it take to get a quote?
Usually within 24 hours. Just send us your drawing or basic specs — the more info you share, the faster we can quote accurately.
What is the difference between a bonded fin and an extruded heat sink?
An extruded heat sink is produced as one continuous aluminum profile. A bonded fin heat sink uses a separate base and fins, allowing taller fins, higher fin density, larger widths, and more material combinations.
Is a bonded fin heat sink as reliable as a one-piece heat sink?
Bonded fin heat sinks can provide reliable long-term performance when the groove design, bonding material, surface preparation, curing process, and inspection plan are properly controlled. The joining method should be selected according to temperature, vibration, humidity, and service-life requirements.
Can you manufacture copper-base and aluminum-fin heat sinks?
Yes. A hybrid design can improve base heat spreading while reducing the weight and cost compared with an all-copper assembly.
Can fans and air ducts be supplied with the heat sink?
Yes. We can manufacture fan-cooled assemblies with brackets, guards, shrouds, mounting hardware, and cable-management features.
What information is required for a quotation?
Please send your drawing, overall dimensions, heat load, airflow conditions, material preference, surface finish, quantity, and any required inspection or assembly standards.
How do you pack the heat sinks?
We select suitable packaging according to the part size, fin density, quantity, and shipping method. Options may include protective trays, cartons, pallets, or wooden crates.
Dense or delicate fins are protected with suitable separators, trays, or custom supports to reduce the risk of damage during transportation.
We can also follow your specified packaging requirements.
Can you do door-to-door shipping?
Yes, we can. We work with several reliable freight forwarders and can arrange door-to-door shipping to most countries — just let us know your delivery address.
We can also use your freight forwarder if you have one.
Request A Quote
Send us your drawing or basic project requirements. Our team will review the construction, materials, airflow, machining features, and production quantity before preparing a quotation.
You can also contact our team at sales@heat-sinks.com