Close-up of high-performance aluminum die-cast cooling fins for a power inverter, engineered with ADC-12 alloy for optimal thermal conductivity.

ISO Certified Manufacturer

Heat Sink & Controller
Die Casting

High-performance aluminum die castings engineered for thermal management applications. ADC-12 / A360 alloy expertise and integrated CNC machining capabilities deliver reliable heat dissipation for LED systems, power electronics, and industrial controllers requiring complex fin geometries and tight dimensional tolerances.

JoinCast provides high-performance die-cast heat sinks and controller housings for electronics manufacturers, leveraging over three decades of experience supplying major brands in the USA and Europe. Our expertise in ADC-12 / A360 alloy and precision die casting allows for complex three-dimensional fin geometries that surpass the limitations of traditional extrusion, ensuring reliable heat dissipation for LED systems, power inverters, and telecommunications equipment. By integrating mold engineering, die casting, and CNC machining within our ISO-certified facility, we deliver customized thermal solutions that meet tight dimensional tolerances and specific industrial requirements.

Our vertically integrated production model eliminates third-party coordination, moving components seamlessly from casting to in-house surface treatments like anodizing and powder coating. To guarantee performance, every component undergoes rigorous dimensional verification via CMM inspection to validate flatness tolerances and mounting hole positions. We also perform material and porosity testing to ensure optimal thermal conductivity and structural integrity at the contact surface. This single-source approach simplifies the supply chain while maintaining total traceability and consistent quality control for every part we ship.

ISO-Certified Quality & Advanced Inspection Component Inspection

JoinCast strictly adheres to the ISO 9001:2015 quality management system. We have invested in a dedicated 10 person QC team for stringent quality control from incoming material to right through to final shipment.

We use Keyence 3D Scanning Systems for dimensional verification and 3D CMMs for micron-level dimensional accuracy verification

Keyence 3D Scanning
Mitutoyo 3D CMM Verification
Dedicated 10 Member QC Team

Why choose die casting over extrusion for heat sink production?

Die casting allows for complex three-dimensional fin geometries that extruded profiles cannot achieve. Where extruded heat sinks are limited to uniform cross-sections, die-cast components can incorporate variable fin heights, non-linear arrangements, and integrated mounting features in a single part. This tends to improve thermal performance in applications with restricted airflow or unconventional form factors.

Die casting also eliminates secondary operations for features like boss holes and clip mounts, reducing your total component cost at production volumes.

What alloy do you recommend for heat sink applications?

ADC-12 / A360 is our standard recommendation for most heat sink and controller housing applications. It offers a good balance of thermal conductivity, castability, and cost-effectiveness for LED systems, power electronics, and industrial controllers.

For applications requiring higher thermal performance, we can work with ADC-3 or discuss alternative alloys based on your specific heat dissipation requirements and operating environment.

How do you ensure flatness tolerances on heat sink mounting surfaces?

Critical mounting surfaces undergo CNC machining after casting to achieve the flatness tolerances required for effective thermal interface contact.

Our temperature-controlled machining operations maintain dimensional stability, and CMM inspection verifies flatness to your specified tolerances before components ship. This should mean consistent thermal transfer between your heat sink and the components it serves.

Can you integrate heat sink features directly into controller housings?

Yes. Our mold engineering team can design controller enclosures with integrated heat sink fins, eliminating the need for separate thermal management components and the assembly steps that go with them.

This approach reduces part count, simplifies your supply chain, and often improves thermal performance by removing interface resistance between housing and heat sink.

What surface treatments do you offer for heat sink components?

We provide anodizing, powder coating, and chemical conversion coatings in-house. Anodizing is the most common choice for heat sinks, as it improves corrosion resistance and emissivity without significantly affecting thermal conductivity.

For controller housings requiring specific colours or enhanced environmental protection, powder coating offers a durable finish. Our team can recommend the appropriate treatment based on your application requirements and operating conditions.

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From Design to Delivery: Full-Service Die Casting

At Joincast we keep every critical process in-house at Joincast, operating from a 9,900 m² facility to deliver dependable lead times and consistent quality. Across three production sites, we run die casting machines (135T–900T), CNC machining centers with automation, plus fully integrated surface treatment lines.

From small precision parts to castings up to 3 kg, we process ADC-12 / A360 and ADC-3 / A383 aluminum alloys in a 24-hour, single-supplier operation.