What This Heatsink Does for Your TEC Assembly This Thermoelectric Cooler Heatsink is a CNC-machined aluminum or copper base plate with optimized fin geometry, designed to pull he
BQUQ Thermoelectric Cooler Heatsink | Precision CNC Heat Sinks Made in China
What This Heatsink Does for Your TEC Assembly This Thermoelectric Cooler Heatsink is a CNC-machined aluminum or copper base plate with optimized fin geometry, designed to pull heat away from the TEC
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
This Thermoelectric Cooler Heatsink is a CNC-machined aluminum or copper base plate with optimized fin geometry, designed to pull heat away from the TEC hot side at a rate of 0.15 K/W in forced-air applications. You get flatness within 0.02 mm across the mounting face, which means your TEC module won’t crack from uneven pressure, and thermal interface material stays under 0.05 mm thick. Lead time is 7 days for standard sizes, 15 days for custom tooling, and we have been doing precision manufacturing for TEC systems since 2005.
Fin Geometry That Beats Extruded Profiles
Extruded heatsinks cap out around a 10:1 fin height-to-gap ratio. We machine ours. That gives you a 18:1 ratio on standard parts, with fin thickness down to 0.8 mm and gaps as tight as 1.2 mm. More surface area per square centimeter means you can shrink the overall footprint by 22% compared to an equivalent extruded unit. For high-heat-flux TECs (over 150 W), we add a vapor chamber option that spreads heat before it hits the fins.
Every fin is cut in a single pass on a 3-axis CNC mill, so there is no draft angle. The walls are perfectly vertical. That is something you cannot get from die casting or extrusion. If you are pairing this with a 40x40 mm or 62x62 mm TEC, the mounting pattern is drilled and tapped to your spec—holes, slots, or threaded inserts.
Materials and Surface Treatment We Use for TEC Heat Sinks
We stock 6061-T6 and 6063-T5 aluminum, plus C11000 copper for maximum conductivity. For aluminum, we offer clear anodizing (8-12 µm thickness) or hard anodizing (25-50 µm) that resists corrosion in humid environments. Copper parts get nickel plating to prevent oxidation. If weight is a concern, we can machine the base down to 3 mm thickness while keeping the mounting face rigid—something casting cannot do.
All raw material comes with mill certificates. We trace the batch number to your order. That matters when your TEC system goes into medical lasers or automotive battery cooling, where material defects are not an option.
How We Hold ±0.01 mm Flatness on the Mounting Face
The TEC hot side is fragile. If your heatsink base is warped by even 0.05 mm, the ceramic plates can shear. We machine the mounting face on a surface grinder after CNC milling, then stress-relieve the part at 180°C for 4 hours. Final flatness is verified with a granite surface plate and dial indicator. We hold 0.02 mm flatness on standard parts, and 0.01 mm on request. Surface finish on that face is Ra 0.8 µm, which is smooth enough for a thin, uniform TIM layer without lapping.
Runout on the fin tips is within 0.05 mm across the full length. That ensures consistent airflow through the fins and no acoustic noise from vibrating tips.
Inspection Before Every Shipment: CMM and Air Gauge
Every Thermoelectric Cooler Heatsink goes through a coordinate measuring machine (CMM) check before packaging. We measure the mounting face flatness, hole positions, and fin spacing on a 20-point grid. If any dimension is out of spec, the part is scrapped—not reworked. Our in-house lab also does a 100% visual inspection for burrs and anodizing defects under 3x magnification. You get a digital inspection report with each order, including a photo of the CMM readout.
For high-volume runs (over 500 pieces), we use an air gauge to check critical hole diameters in under 2 seconds per part. That is how we keep the price down without dropping quality.
Typical Sizes and Performance Data
Parameter
Value
Material
6061-T6, 6063-T5, C11000 copper
Base thickness
3 - 12 mm
Fin height
10 - 60 mm
Fin thickness
0.8 mm (min)
Fin gap
1.2 - 5 mm
Hardness (aluminum)
45 HRB (6061-T6)
Hardness (copper)
50 HRB (annealed)
Mounting face flatness
0.02 mm (std), 0.01 mm (premium)
Surface finish (mounting face)
Ra 0.8 µm
Fin tip runout
0.05 mm
Lead time (standard size)
7 days
Lead time (custom tooling)
15 days
MOQ
No MOQ (1 piece accepted)
Why Pairing This With the Right Cutting Tool Matters
We machine fins with a 0.8 mm end mill at 18,000 RPM. If the tool is dull, the fin surface tears and the thermal performance drops by up to 30%. That is why we follow the CNC cutting tool selection guide to choose the right coating and flute count for each material. For copper, we use a diamond-coated tool. For aluminum, a polished carbide tool with a 45° helix. This is not optional—it is the difference between a heatsink that works and one that overheats your TEC.
Where Tolerances Break Your Thermal Design
If your heatsink base is 0.1 mm thicker than modeled, your thermal resistance calculation is off. If the mounting holes are 0.2 mm off, you cannot bolt the assembly together. We follow the CNC machining tolerances guide on every feature callout. You define the tolerance, we hold it. We never assume "standard" is good enough.
FAQ: Your TEC Heatsink Questions, Answered
What is the minimum order quantity?
No MOQ. We machine one prototype or ten thousand units at the same quality level.
Can you customize the mounting hole pattern for my specific TEC module?
Yes, send your drawing or the TEC datasheet, and we will match the hole pattern, thread size, and depth exactly.
How do you verify flatness on the mounting face?
We use a CMM with a 20-point grid scan and report the measured flatness in the inspection document.
What is the fastest lead time for a custom design?
For a simple fin pattern with standard material, we can ship in 5 days; for complex designs with special coatings, 15 days.
Get Your Firm Quote in 12 Hours
Send your 2D or 3D drawing to sc@bquq.com or WhatsApp +86 13713157787. We will reply with a firm price, lead time, and DFM feedback within 12 hours. Precision manufacturing, made in China, with 20 years of CNC and heat sink experience. No MOQ, no hidden tooling costs.
