This Computer Heat Sink is a CNC-machined aluminum or copper component designed to pull heat away from CPUs, GPUs, and power modules at a rate of 200–400 W/m·K, depending on materi
Precision Computer Heat Sink Manufacturer | BQUQ CNC Machining China
This Computer Heat Sink is a CNC-machined aluminum or copper component designed to pull heat away from CPUs, GPUs, and power modules at a rate of 200–400 W/m·K, depending on material grade. You get fl
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This Computer Heat Sink is a CNC-machined aluminum or copper component designed to pull heat away from CPUs, GPUs, and power modules at a rate of 200–400 W/m·K, depending on material grade. You get flatness within 0.02 mm across the base and a surface finish of Ra 1.6 μm, which keeps thermal interface material (TIM) layers thin and consistent. Lead time is 7 days for prototypes, 15 days for production runs, and our hardness options reach up to HRC 45 for anodized aluminum grades.
How Our CNC Machining Controls Fin Geometry and Flatness
Heat transfer fails when the base plate is warped or fins are uneven. We use 3-axis and 5-axis CNC mills with a positioning accuracy of ±0.005 mm. The base is fly-cut in a single pass to hold flatness under 0.02 mm across a 100 mm square. Fin thickness can go down to 0.8 mm with a height-to-thickness ratio of 20:1. We measure every base plate with a CMM (coordinate measuring machine) before shipping, and we reject anything that exceeds 0.025 mm flatness. This is not a stamped part; it is machined from solid bar, so there are no draft angles or burrs.
Materials and Heat Treatment We Use for Thermal Performance
We stock 6061-T6 and 6063-T5 aluminum for weight-sensitive designs, and C11000 copper for high-end liquid cooling blocks. For aluminum, we offer hard anodizing (MIL-A-8625 Type III) to a thickness of 25–50 microns, which raises surface hardness to HRC 45 and prevents corrosion without adding thermal resistance. Copper parts are nickel-plated (5–10 microns) to stop oxidation. If your application needs a threaded insert or a spring-loaded clip, we can add stainless steel inserts (303 or 304) with a pull-out force of 300 N minimum. We do not use recycled billet unless you explicitly ask—virgin material only, with mill certificates shipped alongside the parts.
Inspection Before Every Shipment: CMM and Leak Testing
Every Computer Heat Sink gets a full dimensional check before it leaves Dongguan. We use a Zeiss CMM for flatness, perpendicularity, and hole positions. Surface roughness is verified with a Mitutoyo profilometer—we hold Ra 1.6 μm on the base and Ra 3.2 μm on fin edges. For liquid cooling plates, we perform a 0.5 MPa air leak test underwater; any bubble means a reject. We also photograph each part with a scale ruler and send you a PDF inspection report within 24 hours of the batch completing. If you need material certification, we include it with the invoice—no extra charge.
Fin Density and Aspect Ratios That Actually Move Air
For passive cooling, you need more surface area. We machine fins as thin as 0.8 mm with a pitch of 2.5 mm, giving you up to 12 fins per inch. For active cooling with a fan, we recommend a fin height of 20–40 mm and a gap of 1.5–2 mm to minimize airflow resistance. Our 5-axis machines can create angled or staggered fin patterns that improve convective heat transfer by 15–20% compared to straight fins, measured in our in-house wind tunnel. We can also add a heat pipe groove—a half-round channel 6 mm wide and 3 mm deep—that accepts a Ø6 mm copper heat pipe with a press fit tolerance of H7/p6.
Surface Finish Options for TIM Adhesion and Corrosion Resistance
The base plate finish determines how well your thermal paste or phase-change material wets the surface. We offer three standard finishes: as-machined (Ra 1.6 μm), bead-blasted (Ra 3.2 μm, good for adhesive bonding), and lapped (Ra 0.8 μm, for direct die contact). For outdoor or industrial environments, we apply a clear anodize or black anodize that meets ASTM B921. If you need a specific logo or part number, we use laser engraving with a depth of 0.05 mm—no ink, no peeling, readable after 500 hours of salt spray testing.
Lead Time and MOQ: Prototype in 7 Days, No Minimum Quantity
We run a paperless shop floor with automated tool presetting, which cuts setup time by 40%. For a single prototype Computer Heat Sink, lead time is 7 calendar days. For production runs of 100–5,000 pieces, lead time is 15–20 days. Our MOQ is zero—you can order one piece for testing. We do not charge tooling fees for standard designs; custom fixtures cost $150–$400, and we refund that on your first order of 500 pieces. Shipping from Dongguan to the US West Coast takes 5 days by air or 25 days by sea. We quote both options with every RFQ.
Specification
Value / Range
Notes
Material
6061-T6, 6063-T5, C11000 copper
Virgin billet, mill cert included
Base thickness
3 mm – 20 mm
Fly-cut single pass
Fin thickness
0.8 mm – 3 mm
Max aspect ratio 20:1
Fin pitch
2.5 mm – 5 mm
Up to 12 fins per inch
Hardness (aluminum)
HRC 45 (hard anodized)
MIL-A-8625 Type III
Flatness (base)
≤ 0.02 mm
Measured on CMM
Surface finish (base)
Ra 0.8 – 1.6 μm
Lapped option available
Position tolerance (holes)
±0.01 mm
True position per ISO 5458
Lead time (prototype)
7 days
1–10 pieces
Lead time (production)
15–20 days
100–5,000 pieces
MOQ
No MOQ
One piece accepted
Choosing the right tool path is critical for thin fins. If you are designing a new part, read our CNC cutting tool selection guide to understand how flute count and helix angle affect fin deflection. Also, review our CNC machining tolerances guide to ensure your drawing specifies achievable limits—this saves you from paying for unnecessary precision.
What is your minimum order quantity for a Computer Heat Sink?
There is no MOQ—we accept one piece for prototype validation, and volume pricing kicks in at 100 pieces.
Can you customize the fin pattern or base shape to fit my existing enclosure?
Yes, we machine any shape from your 3D file (STEP or IGES), including angled fins, stepped bases, and integrated mounting bosses.
How do you ensure quality for a heat sink with tight flatness requirements?
We use a Zeiss CMM for 100% inspection on flatness and hole positions, and we provide a PDF inspection report with every shipment.
How fast can I get a quote and production samples?
Send your drawing (PDF or STEP) and we return a firm quote within 12 hours; samples ship in 7 days via express courier.
Send your drawing today for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We reply within one business hour, even on weekends.
