This is the Black Anodized Aluminum Heatsink Collection from BQUQ, a 20-year precision manufacturing factory in Dongguan, China. You get CNC-machined heat sinks with 0.01 mm dimen
Black Anodized Aluminum Heatsink Collection | BQUQ Precision CNC
This is the Black Anodized Aluminum Heatsink Collection from BQUQ, a 20-year precision manufacturing factory in Dongguan, China. You get CNC-machined heat sinks with ±0.01 mm dimensional tolerance, 8
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
This is the Black Anodized Aluminum Heatsink Collection from BQUQ, a 20-year precision manufacturing factory in Dongguan, China. You get CNC-machined heat sinks with ±0.01 mm dimensional tolerance, 8 Ra surface finish, and a 5-day standard lead time for prototypes. The anodized layer is 18–25 microns thick, giving you a hardness of 300 HV minimum (equivalent to 30 HRC on the coating scale).
Why Our Anodized Layer Is Not Just Cosmetic
Black anodizing on aluminum does three jobs: it radiates heat better, it resists corrosion, and it protects the part from scratches. Our Type II sulfuric acid anodizing produces a dense oxide layer of 18–25 microns. That layer is integral to the aluminum, not a paint that peels. Thermal emissivity increases from 0.05 (bare aluminum) to 0.88 (black anodized). If you need higher wear resistance, we also offer hard anodizing (Type III) at 40–50 microns with 400+ HV hardness. Both options are included in this collection.
CNC Machining Tolerances That Matter for Thermal Interfaces
The base flatness of your heat sink determines how well it contacts your IGBT, CPU, or laser diode. Our CNC machining centers hold base flatness to 0.02 mm over 100 mm length. That is not a marketing number — we measure it on a granite surface plate with a dial indicator. The fin thickness tolerance is ±0.05 mm, and the hole positions are ±0.01 mm. If you are mating this heat sink to a power module, the flatness directly affects thermal resistance. A 0.05 mm air gap can increase thermal resistance by 20–30%. We eliminate that gap. For more on how we achieve this, see our CNC machining advantages for heat sink production.
Materials We Stock for Immediate Machining
We keep 6061-T6 and 6063-T5 aluminum in stock in sizes from 50×50 mm to 400×400 mm. 6061-T6 has a yield strength of 276 MPa, good for mounting brackets and structural fins. 6063-T5 is softer but has better thermal conductivity (201 W/m·K vs 167 W/m·K for 6061). For high-power LED or laser applications, we also stock 1050A (conductivity 229 W/m·K) but it is less machinable. Tell us your wattage and airflow, and we will suggest the right alloy. All material certificates are available with every shipment.
Fin Geometry: How Deep and Thin We Can Cut
Our 3-axis and 4-axis CNC mills can cut fins as thin as 1.0 mm with a depth-to-width ratio of 10:1. That means a 1 mm fin can be 10 mm tall. For taller fins (up to 80 mm), we go to a 5:1 ratio with a 2 mm minimum fin thickness. The gap between fins can be as small as 1.5 mm. These numbers come from our actual tooling library — we use carbide end mills with 0.5 mm radius and high-pressure coolant to evacuate chips. If you need a pin-fin array, we can do square pins from 2×2 mm up to 8×8 mm. The limit is not our machines; it is your thermal requirement. We can also machine a base thickness from 3 mm to 40 mm depending on the structural load.
Inspection Before Every Shipment: Not Just a Spot Check
Every heat sink in this collection is 100% inspected, not sampled. We use a CMM (coordinate measuring machine) with 0.001 mm resolution to verify critical dimensions. Flatness is checked with a laser interferometer. The anodizing thickness is verified with an eddy current gauge on three points per part. We also do a 10x magnified visual check for scratches or pits on the anodized surface. You receive a dimensional inspection report with each order, whether you buy one piece or one thousand. This is standard practice, not a paid extra.
Lead Time and MOQ: Built for Prototypes and Production
No MOQ. You can order a single prototype and we will machine it. Standard lead time is 5 days for prototypes (up to 10 pieces) and 15 days for production quantities (100–5000 pieces). For urgent needs, we offer 72-hour express service on simple geometries with existing tooling. We are a mid-sized factory, so your order is not lost in a queue. We run two shifts, 20 CNC machines, and our own finishing line — no outsourcing of anodizing or stamping. This vertical integration is why we can hold the lead time.
Surface Finish and Cosmetic Quality
After CNC machining, we deburr every edge manually — no sharp corners left for handling or wire chafing. The anodized surface is uniform matte black with a gloss level of 30–35% (per ASTM D523). We mask off mounting surfaces if you need bare aluminum for electrical grounding or thermal paste application. The standard Ra is 0.8 microns on the base and 1.6 microns on the fins. If you need a mirror finish for a sealing surface, we can polish to 0.4 Ra before anodizing. Cosmetically, we avoid rack marks by using custom fixtures that hold the part from the bottom or sides.
Thermal Performance Data We Can Provide
We do not guess thermal performance. We can run a CFD simulation based on your airflow and power dissipation, and give you a predicted junction temperature. For validation, we have a thermal test rig with heat sources up to 500W and thermocouples at the base and fin tips. If you already have a thermal model, send it to us and we will machine to match your geometry. For reference, a typical 100×100×40 mm black anodized heat sink with 10 fins at 2 mm thickness has a thermal resistance of 0.8°C/W in natural convection. We can improve that by 15% with a pin fin design. Need more details on thermal management? Read our CNC machining for LED heat sink thermal management guide.
Specification
Value
Materials
6061-T6, 6063-T5, 1050A aluminum
Size range
20×20 mm to 400×400 mm base
Fin thickness (min)
1.0 mm (10:1 depth ratio)
Fin gap (min)
1.5 mm
Base flatness
0.02 mm over 100 mm length
Dimensional tolerance
±0.01 mm (holes, slots)
Surface finish (Ra)
0.8 µm base, 1.6 µm fins
Anodizing thickness
18–25 µm (Type II), 40–50 µm (Type III)
Coating hardness
300 HV min (Type II), 400 HV (Type III)
Thermal emissivity
0.88 (black anodized)
Lead time (prototype)
5 days (up to 10 pcs)
Lead time (production)
15 days (100–5000 pcs)
MOQ
No MOQ
Inspection
100% CMM, flatness, anodizing thickness
How to Specify Your Heat Sink for Fast Quoting
To get an accurate quote in one day, send us a STEP or IGES file plus three numbers: total power dissipation (watts), maximum allowed base temperature (°C), and available airflow (m/s or CFM). If you do not have a CAD file, send a hand sketch with critical dimensions. We will suggest a fin geometry and material. If you have an existing design that did not perform well, send it anyway — we will tell you if the problem is flatness, surface finish, or material choice. We do not charge for this engineering review. For more context on tolerances, check our CNC cutting tool selection guide and CNC machining tolerances guide.
Packing and Shipping: No Damage in Transit
Anodized surfaces scratch easily, so we wrap each heat sink individually in anti-static foam. For production orders, we use custom corrugated boxes with die-cut foam inserts that hold each part in its own cavity. We ship via DHL, FedEx, or UPS for small orders (2–3 day delivery to US and Europe). For larger orders, we use sea freight with export-grade wooden crates. Every package includes the inspection report and material certificate. We have shipped to over 30 countries with zero transit damage claims in the last 12 months.
What is the minimum order quantity?
There is no MOQ — we machine a single prototype or a batch of 10,000 with the same attention to tolerance and inspection.
Can you customize the fin geometry for my specific thermal load?
Yes, we adjust fin thickness, height, spacing, and base thickness based on your wattage and airflow, and we can run a CFD simulation to verify before machining.
How do you guarantee the quality of the anodized coating?
We measure coating thickness with an eddy current gauge on three points per part and verify the seal quality with a dye stain test per ASTM B136.
What is the typical lead time if I need a rush order?
For simple geometries with existing tooling, we can deliver in 72 hours; for custom designs, the standard 5-day prototype lead time applies.
Send your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We will come back with a price, lead time, and a DFM (design for manufacturing) note if we see a way to reduce cost without hurting thermal performance. This is the Black Anodized Aluminum Heatsink Collection from BQUQ — precision manufacturing, made in China, with no MOQ and no compromise on inspection.
