OEM CNC Machined Heat Sink from China Per Drawing
We are a China-based custom heat sink manufacturer and OEM thermal solution factory, producing CNC machined aluminum heat sinks, custom copper heat sinks, extruded profile heat sinks, die-cast heat sinks, skived fin heat sinks, bonded fin heat sinks, folded fin heat sinks, heat pipe heat sink assemblies and liquid cold plates strictly according to customer drawings, 3D models (STEP / IGES / X_T), 2D drawings (DWG / DXF / PDF) or supplied physical samples.
As an experienced custom heat sink China supplier, we combine precision CNC milling and turning, aluminum extrusion, high-pressure die casting, fin skiving, fin bonding and fin stacking under one roof, so every custom aluminum heat sink, custom copper heatsink or mixed-material thermal assembly can be engineered, prototyped and produced without moving between vendors.
Per Drawing or Per Sample
Build to your CAD files, engineering drawings or reverse-engineered samples, including non-standard and legacy profiles.
Six Core Heat Sink Processes
CNC machining, extrusion, die casting, skiving, fin bonding and folded / swaged fin assembly in one factory.
One Piece to Mass Production
Single prototypes, pilot batches and repeat high-volume orders all run on the same controlled process flow.
Tight Tolerance, Controlled Finish
Machined features to ±0.01 mm, fine surface roughness and a full menu of cosmetic and protective surface treatments.
Custom Heat Sink Product Range
A cross-section of the OEM heat sinks and liquid cooling plates we machine and assemble for customers worldwide — FSW cold plates, skived fin stacks, extruded profiles, copper heatsinks and die-cast thermal parts.
Heat Sink Types We Build to Order
Every thermal problem has a structure that fits it. Below are the eight main custom heat sink families we manufacture as an OEM heat sink China factory; many finished products combine two or more of these constructions in a single CNC-machined assembly.
Extruded Profile Heat Sinks
Custom aluminum extrusion heat sinks in 6063-T5 with customer-defined fin pitch, fin height and base thickness. Extruded profiles are cut, CNC machined, drilled, tapped and surface treated to length — the most cost-effective custom aluminum heat sink for medium power loads and series volumes.
CNC Machined Heat Sinks
Solid-block heat sinks carved from aluminum or copper plate by 3-axis, 4-axis and 5-axis CNC milling, allowing very fine fins, complex pockets, embedded channels, mixed fin zones and precise mounting datums that extrusion cannot achieve. Ideal for compact, high-performance custom heatsinks per drawing.
Skived Fin Heat Sinks
Skiving (shovel-tooth) machines peel ultra-thin continuous fins directly from an aluminum or copper base, reaching fin thickness down to roughly 0.1 mm with no interface resistance between fin and base. A preferred custom skived fin heat sink for high-fin-density forced-air cooling.
Bonded Fin Heat Sinks
Individual aluminum or copper fins are bonded into precisely machined base grooves with thermally conductive epoxy or low-temperature soldering. Bonded-fin construction supports tall fins, wide coolers and mixed fin orientations when an extrusion ratio would otherwise be impossible.
Folded / Swaged Fin Heat Sinks
Also called folded-fin, zipper-fin or inserted-fin (swaged) heat sinks: a corrugated fin pack is folded from thin aluminum or copper strip and locked, stacked or swaged into a machined base. Light weight, high aspect ratio and excellent air-side surface area per gram.
Die-Cast Heat Sinks
High-pressure aluminum or zinc alloy die casting integrates fins, bosses, mounting feet and housings in one near-net-shape part, followed by CNC finish machining of sealing and contact faces. Suitable for OEM die-cast heat sinks in stable, high-volume programs.
Heat Pipe Heat Sinks
Sintered or grooved copper heat pipes are embedded, soldered or pressed into CNC-machined bases and fin stacks to move heat rapidly to a remote dissipation area. Custom heat pipe heat sink assemblies can be shaped in 2D and 3D to fit restricted enclosures.
Liquid Cold Plates
Custom water cooling plates made by gun drilling, CNC-milled channel covers, brazing or friction stir welding (FSW) in aluminum or copper, with machined G-thread / NPT ports, O-ring grooves and leak-tested channels for IGBT, laser, battery and server liquid cooling loops.
Heat Sink Manufacturing Processes
Selecting the right forming process is what separates a thermally efficient heat sink from an expensive block of metal. Our engineers match each custom OEM heat sink to one process — or a controlled combination — based on power density, envelope, fin geometry, target unit cost and annual volume.
1CNC Precision Machining
3/4/5-axis CNC milling, CNC turning, drilling, tapping, counterboring, pocketing and face milling turn forged plate, extruded bar, casting or forged copper into finished custom machined heat sinks. CNC is used both as a stand-alone process for block heatsinks and as the finishing stage for every other process family.
2Aluminum Extrusion
Custom extrusion dies are opened from your profile drawing; 6063 and 6061 aluminum billets are pressed into continuous heat sink profiles, aged to T5/T6 temper, then cut to length and CNC finished. Low tooling cost and fast sampling make extruded heat sinks the volume workhorse of the industry.
3High-Pressure Die Casting
Molten aluminum alloy (such as A380 / ADC12) or zinc alloy is injected into a custom mold under pressure, producing complex integrated heat sink bodies with ribs, pins, feet and housing features in one shot; critical contact faces are then CNC machined to guarantee flatness.
4Fin Skiving
A precision skiving knife slices and folds fins out of the base material itself in one continuous pass, producing one-piece aluminum or copper skived fin heat sinks with extremely thin, gap-free fins — excellent for forced convection where bonded interfaces would add thermal resistance.
5Bonded-Fin Assembly
Fins are cut to exact height, inserted into grooves CNC-milled into the base, and fixed with high-thermal-conductivity bonding agent or vacuum soldering. Bonded fin heat sinks unlock fin heights and aspect ratios beyond extrusion limits and allow aluminum fins on copper bases.
6Folded / Inserted-Fin Assembly
Fin strip is folded into a continuous accordion pack and inserted, swaged, brazed or soldered between base plates or tubes. The process yields lightweight zipper-fin and stacked-fin cores for CPU coolers, radiator cores, heat pipe towers and forced-air custom heat sink modules.
Materials We Machine into Heat Sinks
Material choice sets the ceiling of thermal performance, weight and cost. We stock and machine the full range of standard heat sink alloys and can source customer-specified tempers, alloy grades and batch-traceable raw material for every production lot.
Aluminum 6063-T5
The classic extrusion heat sink alloy, with thermal conductivity around 200 W/(m·K), smooth anodizing response and high formability for thin extruded fins. Used for most custom extruded aluminum heat sinks and profiles.
Aluminum 6061-T6
Higher strength with conductivity around 167 W/(m·K), preferred for CNC-machined heat sink plates, structural cold plates, pressure-bearing liquid plates and parts requiring tapped holes and mechanical load.
Aluminum 6060 / 6005
Alternative extrusion alloys selected when slightly higher strength or a specific surface finish after anodizing is required for custom aluminum profile heat sinks used in lighting and architectural applications.
Aluminum 1060 / 1100
Near-pure aluminum with conductivity above 220 W/(m·K) and excellent ductility, commonly used for skived fins, folded fin stock and soft-aluminum cold plate covers where forming matters more than strength.
C11000 / C10100 Copper
Oxygen-free and ETP pure copper at roughly 390 W/(m·K) for custom copper heat sinks, copper cold plates, heat pipe evaporator bases and concentrated heat-source spreading where aluminum cannot keep junction temperatures low enough.
Brass C36000 & Copper Alloys
Free-machining brass and bronze alloys for CNC-turned fittings, threaded port inserts, standoffs and liquid cooling connectors integrated into custom heat sink and cold plate assemblies.
Aluminum–Copper Hybrid
Copper base or copper inlay paired with aluminum fins, bonded or soldered to combine copper's spreading power at the heat source with aluminum's light weight and large air-side fin area.
Steel & Special Alloys
Stainless steel mounting plates, spring clips, brackets and fasteners, plus specialty alloys on request, machined and finished alongside the thermal body so the complete assembly arrives ready to install.
Industries We Supply Custom Heat Sinks For
Our OEM CNC machined heat sinks, extruded profiles, die-cast thermal housings and liquid cold plates are designed into cooling systems across twelve major industries, from single engineering prototypes to repeat batch production.
Telecom & 5G Networks
Custom extruded and skived heat sinks for 5G base stations, AAU/RRU units, routers and outdoor cabinet amplifiers requiring wide, low-profile cooling and weather-resistant surface treatment.
Servers & AI Computing
CNC-machined CPU/GPU heatsinks, folded-fin and heat-pipe tower coolers, vapor-chamber bases and cold plates for data centers, AI accelerator cards and high-density rack servers.
New Energy Vehicles
Heat sinks and liquid cooling plates for EV motor controllers, on-board chargers, DC-DC converters, charging piles and autonomous-driving compute units, built per automotive drawings.
Energy Storage & BMS
Battery pack liquid cold plates, busbar cooling bars and CNC-machined BMS heat sinks for residential, commercial and grid-scale energy storage systems.
LED Lighting & Displays
Custom extruded aluminum heat sinks for high-bay lights, stage lights, grow lights, stadium floodlights and fine-pitch LED display modules, with black anodized or powder-coated finishes.
Power Electronics & IGBT
Machined aluminum and copper base plates, bonded-fin stacks and water cooling plates for IGBT modules, inverters, rectifiers, UPS systems, thyristor stacks and welding equipment.
Laser & Optical Systems
High-flatness CNC-machined copper and aluminum heat sinks plus micro-channel cold plates for fiber lasers, diode modules, laser cutting heads and precision optical instruments.
Medical Devices
Compact custom heatsinks for diagnostic imaging, laser therapy, laboratory analyzers and patient-monitoring electronics where cosmetic finish, cleanliness and dimensional stability matter.
Industrial Automation
Heat sinks for PLCs, servo drives, motor controllers, frequency converters, robotics controllers and industrial power supplies, produced to drawing in both small and series batches.
Aerospace & Defense Electronics
Lightweight precision-machined aluminum and copper heat sinks and conduction-cooled card frames for ruggedized onboard electronics, radar and communication payloads.
Consumer Electronics
Custom CNC-machined and die-cast heat sinks for projectors, game consoles, audio amplifiers, mini-PCs and home appliances where appearance, weight and unit cost are balanced.
Wind & Solar Power
Large extruded and bonded-fin heat sinks for photovoltaic string and central inverters, wind turbine converters and combiner boxes, including wide-format profiles CNC-finished to drawing.
Machining Precision and Surface Quality We Achieve
Because every heat sink starts as a machined part, thermal contact performance depends directly on mechanical precision. The figures below represent the routinely achievable capability of our CNC machining workshop for custom aluminum and copper heat sinks; tighter requirements can be reviewed drawing by drawing.
How Precision Protects Thermal Performance
The base contact face of a custom heat sink is where heat first crosses from component to metal. Warpage, tool marks or poor flatness force the thermal interface material to fill gaps, and every extra micrometer of gap raises junction temperature. We face-mill contact surfaces to controlled flatness and surface roughness so the heat sink mates evenly with IGBT modules, CPU heat spreaders, laser diodes or PCB copper pads.
Hole positions, thread depths, pin-fin arrays, O-ring grooves on liquid cold plates and heat-pipe press-fit bores are all machined to drawing-defined true-position tolerances, which keeps automated assembly smooth and prevents coolant leaks at sealing faces.
Surface Quality, Deburring and Cleanliness
Every custom machined heat sink leaves the milling or turning stage with controlled edge break: sharp burrs are removed by hand deburring, tumbling, brushing or vibratory finishing, and fin tips are inspected so they remain straight without dangerous sharp edges.
Cold plates and wetted parts undergo chip removal, ultrasonic cleaning and coolant-channel flushing before leak testing, while cosmetic surfaces can be specified as-machined, brushed, sandblasted, bead-blasted or polished before the final surface treatment is applied, giving a repeatable appearance across production lots.
Surface Treatments Available for Custom Heat Sinks
Surface treatment controls emissivity, corrosion resistance, electrical insulation or conductivity, cosmetic appearance and glare. The same OEM heat sink can be delivered with different finishes across programs — all applied after CNC machining and inspected before packing.
Clear / Natural Anodizing
Standard sulfuric-acid anodizing on 6061/6063 aluminum raises surface emissivity and protects against oxidation while keeping the natural silver look of a machined aluminum heat sink.
Black & Hard Anodizing
Black anodizing maximizes radiative heat dissipation and reduces glare for LED and optical products; hard anodizing adds a thicker, wear-resistant layer for cold plates and sliding interfaces.
Powder Coating
Durable polyester powder layers in matte black, RAL colors or customer-defined shades for outdoor telecom heat sinks, lighting heatsinks and visible consumer products, with controlled film thickness.
Chromate Conversion Coating
Thin conductive chemical conversion film on aluminum that preserves electrical grounding while providing corrosion protection, commonly requested for electronic enclosure-integrated heat sinks.
Sand & Bead Blasting
Uniform matte texture applied before anodizing to hide tool marks and deliver a high-end, fingerprint-resistant appearance on CNC-machined faces and visible extrusion surfaces.
Brushing, Polishing & Tumbling
Directional brushing, mirror polishing or vibratory tumbling for cosmetic aluminum and copper parts, combined with edge breaking so fin arrays and mounting flanges are smooth to handle.
Nickel / Tin / Zinc Plating
Electroless nickel or tin plating for custom copper heat sinks and cold plates to prevent copper oxidation and improve solderability; zinc or nickel plating for steel brackets and fasteners.
Electrophoresis & Marking
Electrophoretic black coating for thin, even coverage in dense fin gaps, plus silk-screen printing and laser engraving of part numbers, orientation marks and customer labels on request.
Machining and Inspection Capabilities
Custom heat sink quality is built on the shop floor and verified before shipment. Our CNC machining and dimensional inspection workflow keeps forming, finishing and measurement under the same quality plan, from first-article samples to repeat production lots.
CNC Milling Service
3-axis, 4-axis and 5-axis CNC milling centers shape heat sink bases, pin-fin arrays, fin grooves, pockets, O-ring seal grooves and mounting patterns from aluminum plate, copper plate, extrusions or castings. Fixture design protects thin fins from bending during machining and keeps large cold plates flat.
CNC Turning Service
CNC lathes and turn-mill machines produce cylindrical heat sink barrels, LED pin heatsinks, copper standoffs, threaded coolant port fittings, nozzles and inserts in aluminum, brass and copper, with concentric and threaded features held to drawing for direct assembly into cold plates and modules.
2D Profile Projector Measurement
Optical profile projectors and vision measurement machines verify thin fin thickness, fin pitch, chamfers, radii and 2D profiles that are difficult to reach with tactile probes, recording measured values for first-article and in-process checks on skived, folded and machined fin arrays.
CMM Coordinate Measuring
A coordinate measuring machine inspects critical dimensions, hole positions, flatness, parallelism and true position against the customer drawing. Dimensional inspection reports and first-article measurement records can accompany shipment so incoming-quality teams can reconcile every custom heat sink lot.
From Drawing or Sample to Finished Custom Heat Sink
We accept formal engineering drawings as well as physical samples. For sample-only projects, dimensions are reverse-engineered into editable drawings and confirmed with the customer before any tooling or machining begins.
1Drawing / Sample Review
Engineering reviews STEP, IGES, X_T, DWG, DXF or PDF files — or measures a supplied sample — and checks thermal geometry, wall thickness, fin ratio, thread specs and machinability before quoting.
2Process & Material Selection
The optimal route is selected among CNC machining, extrusion, die casting, skiving, bonded fin and folded fin, with aluminum or copper alloy, surface treatment and packaging defined per the application.
3Tooling & Prototyping
Extrusion dies, casting molds or machining fixtures are prepared, and prototype custom heat sinks are machined for fit checks, thermal verification and design iteration before volume release.
4First-Article Verification
First articles are fully inspected by CMM, projector and gauges against drawing dimensions; samples and measured records are shared for customer approval before series production starts.
5Batch & Series Production
Approved designs move into controlled batch production with fixed machining parameters, tooling, work instructions and in-process patrol inspection to keep lot-to-lot consistency.
6Finishing, Inspection & Packing
Deburring, surface treatment, final dimensional inspection, cleaning and protective packaging are completed before delivery; cold plates additionally receive pressure and leak testing.
From a Single Prototype to High-Volume Production
As a flexible custom heat sink China manufacturer, we support engineering buyers at every stage of a product lifecycle — the same drawing can start as a one-off CNC prototype and scale into a repeat extrusion or die-casting program without changing supplier.
One-Off & Single Pieces
Single custom CNC machined heat sinks and engineering samples cut directly from aluminum or copper plate — no mold or extrusion die required — for R&D, fit checks and thermal bench testing.
Small Batch Production
Pilot runs from a few pieces to several hundred, typically CNC-machined or skived, allowing design validation and small-series product launches with short lead times and no heavy tooling investment.
Series / Mid-Volume Runs
Recurring batches in the thousands based on custom extrusion profiles, bonded-fin assemblies or CNC cells scheduled against customer forecasts with stable pricing and repeat first-article standards.
Mass Production
High-volume OEM programs supported by dedicated extrusion dies, die-casting molds, fixtures and standardized work instructions, delivering identical custom heat sinks lot after lot for global supply chains.
CNC Machined Heat Sink Capabilities at a Glance
A quick map of the made-to-print thermal components buyers most often request from our China heat sink factory. Each line can be produced as a stand-alone part or merged into a hybrid assembly.
CNC Machined Aluminum Heat Sink
Custom CNC milled aluminum heat sinks in 6061, 6063 and 1060 for electronics, LED, IGBT and communication modules — block heatsinks, pin-fin heatsinks, pocketed bases and profiles finished exactly per drawing.
CNC Machined Copper Heat Sink
Custom C11000 pure copper heatsinks, copper spreader plates and copper skived fin stacks for concentrated heat sources such as laser diodes, CPUs/GPUs and power modules, with nickel or tin plating available.
CNC Machined Liquid Cold Plate
Drilled, milled-cover, brazed and FSW aluminum or copper water cooling plates with threaded ports, O-ring grooves and leak-tested channels for battery, IGBT, laser and data-center liquid cooling.
Custom Extruded Aluminum Heat Sink
OEM aluminum extrusion heat sink profiles opened from customer drawings, cut, CNC-machined, tapped and anodized — the economical custom aluminum heat sink China solution for medium and high volumes.
OEM Die-Cast Heat Sink
Custom aluminum and zinc alloy die-cast heat sink housings with integrated fins and mounting features, CNC-trimmed on contact faces, powder-coated or chromated for lighting, appliance and automotive programs.
Skived / Bonded / Folded Fin Heat Sink
High-density custom skived fin heat sinks, bonded fin stacks and folded zipper-fin cores in aluminum and copper, combined with heat pipes, vapor chambers or CNC bases for forced-air high-power cooling.
Frequently Asked Questions About Custom Heat Sinks
Practical answers engineering and procurement teams usually need when sourcing an OEM CNC machined heat sink from China.
Can you make a heat sink exactly to our drawing?
Yes. We manufacture strictly per customer-supplied 2D drawings and 3D models, holding the dimensions, tolerances, threads, surface roughness and surface treatment noted on the drawing; conflicting or unmanufacturable features are flagged during review rather than changed silently.
We only have a physical sample, no drawing — can you copy it?
Yes. The sample is measured by CMM and profile projector, reverse-engineered into a drawing and 3D model, and the reconstructed dimensions are confirmed with you before tooling or production, which is useful for legacy and discontinued heat sinks.
Which process fits a high-power-density device?
Dense skived or bonded fins, copper bases, embedded heat pipes and liquid cold plates handle progressively higher heat fluxes. We recommend a construction after reviewing power, airflow or coolant conditions, envelope and target temperature rise.
What is the minimum order quantity?
There is no hard MOQ for CNC-machined custom heat sinks: a single prototype is acceptable. Extruded and die-cast routes involve tooling, so they become economical at series volumes, while CNC and skiving routes suit low volumes.
Aluminum or copper — how do we choose?
Aluminum (6061/6063) is lighter, cheaper and easier to extrude and anodize for most air cooling; pure copper spreads heat roughly twice as effectively and suits concentrated sources and liquid plates. Hybrid copper-base plus aluminum-fin designs split the difference.
Can several processes be combined in one assembly?
Yes — for example a CNC-machined copper base, soldered heat pipes and an aluminum skived or folded fin stack, finished with black anodizing. Mixed-process assemblies are common in servers, telecom, EV power electronics and laser systems and are built and inspected as one part.
Your Custom Heat Sink Manufacturing Partner in China
Whether your program calls for a custom aluminum heat sink machined from a solid block, a custom copper heatsink for a concentrated heat source, a cost-driven extruded aluminum profile, an OEM die-cast heat sink housing, a high-density skived, bonded or folded fin stack, a heat-pipe assembly or a friction-stir-welded liquid cold plate, our China factory builds it per drawing or per sample — from a single CNC prototype to steady mass production.
Send your STEP, IGES, DWG, DXF or PDF files — or a reference sample — and our engineering team will review the geometry, recommend the most suitable process, alloy and surface treatment, and produce CNC machined heat sinks that fit your envelope, meet your dimensional requirements and support your product across prototype, batch and serial-production stages. Search terms we serve include custom heat sink China, OEM heat sink China, custom aluminum heat sink China, custom copper heat sink manufacturer, CNC machined heat sink supplier, extruded heat sink factory, die-cast heat sink OEM, skived fin heat sink manufacturer and custom liquid cold plate China.