What This Profile Delivers Before You Even Ask for a Quote This Aluminum Extrusion Heatsink Profile is a raw or CNC-finished extruded aluminum body built for active or passive coo
BQUQ Aluminum Extrusion Heatsink Profile | Precision CNC Finishing, Made in China
What This Profile Delivers Before You Even Ask for a Quote This Aluminum Extrusion Heatsink Profile is a raw or CNC-finished extruded aluminum body built for active or passive cooling of power electr
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What This Profile Delivers Before You Even Ask for a Quote
This Aluminum Extrusion Heatsink Profile is a raw or CNC-finished extruded aluminum body built for active or passive cooling of power electronics, LED drivers, and IGBT modules. You get a straightness tolerance of 0.05mm per 300mm, a surface finish down to Ra 0.8µm after machining, and a hardness range of 8–12 HRC depending on alloy temper. Lead time is 7 days for standard profiles, 15 days for custom dies, and we ship from Dongguan with no MOQ on stocked alloys.
How We Control Flatness and Twist on Long Extrusions
Long heat sinks warp during extrusion and cooling. BQUQ uses a 2500-ton extrusion press with a precision air-quench table that locks in profile geometry before the cut-off saw. After extrusion, we stretch-straighten every bar to a twist of 0.5° per meter maximum. If your design needs tighter flatness for thermal pad contact, we CNC machine the mounting surface to a flatness of 0.03mm across 200mm. This is not a rolling mill product; it's a precision manufacturing component made in China with real dimensional accountability.
Alloys, Tempers, and the Hardness Numbers That Matter
We stock 6063-T5 for maximum extrudability and 6061-T6 for higher mechanical strength. For applications above 250°C continuous, we recommend 6063-T6 with a hardness of 12 HRC. If you need anodizing, we hold the extrusion tolerance before anodize to allow for the 25-micron coating buildup. The table below shows the exact specs we quote on every Aluminum Extrusion Heatsink Profile, not a "typical" range.
Parameter
Specification
Material Alloys
6063-T5, 6061-T6, 6060-T66
Max Extrusion Width
400mm (custom die) / 200mm (stock)
Max Extrusion Length
6000mm (CNC cut to length)
Hardness (HRC)
8–12 HRC (T5/T6 temper dependent)
Straightness Tolerance
0.05mm per 300mm length
Twist Tolerance
0.5° per meter
CNC Machined Surface Flatness
0.03mm over 200mm
Surface Finish (Machined)
Ra 0.8µm (standard) / Ra 0.4µm (optional)
Lead Time
7 days (stock profile) / 15 days (custom die)
MOQ
No MOQ — 1 piece for prototype, 50 pcs for production
CNC Finishing Options That Turn a Raw Extrusion into a Mounting-Ready Part
A raw extrusion is just a bar. BQUQ's 3-axis and 4-axis CNC machining centers add the features you actually need: drilled through-holes for mounting, tapped M3–M10 threads, milled steps for component seating, and cut slots for PCB edge insertion. We hold hole position to +/-0.02mm and tapped thread depth to +/-0.1mm. If your thermal design requires a mirror finish for a heat pipe interface, we offer a diamond-turned face at Ra 0.2µm. For guidance on which cutting tools handle these fine features without burrs, see our CNC cutting tool selection guide.
Surface Treatments That Don't Add Thickness Where You Don't Want It
We offer three standard finishes: clear anodize (8–12 microns), black anodize (15–25 microns), and chemical film (MIL-DTL-5541). For black anodize, we mask the mounting surface before coating so your flatness stays true — unmasked anodize can add 25 microns of non-uniform build-up. If you plan to use thermal paste, we recommend skipping anodize on the contact area and leaving a bare machined surface at Ra 0.8µm. We also do silk-screen logos and laser engraving directly on the extrusion after CNC processing.
Inspection Before Every Shipment: CMM Reports You Can Trust
Every batch of Aluminum Extrusion Heatsink Profiles gets a full inspection before packing. We use a coordinate measuring machine (CMM) for hole positions, a surface roughness tester for Ra values, and a straightedge with feeler gauge for straightness on every 10th piece. You receive a digital inspection report with actual measured values, not a certificate of conformity. For critical aerospace or automotive parts, we can also provide full material traceability from the billet cast number to the final CNC program. If you're unsure about which tolerances to specify, our CNC machining tolerances guide explains what's achievable and what costs extra.
Packaging and Logistics for Long Profiles Without Bending
We pack profiles over 1 meter in wooden crates with foam separators every 300mm to prevent sagging. For lengths under 1 meter, we use corrugated boxes with individual poly bags and corner protectors. All crates are marked with the PO number and heat sink part number. Shipping options: DHL/FedEx for small quantities (3–5 days), air freight for urgent orders (5–7 days), or sea freight for bulk orders (25–30 days). We calculate the best freight cost based on volumetric weight, not just actual weight, saving you money on long profiles.
What is your minimum order quantity for a custom extrusion die?
No MOQ — we will make one single prototype from a custom die for your validation, then move to production at any quantity you need.
Can you match a specific fin height and thickness from my drawing?
Yes, we can adjust the die design to fin heights from 5mm to 120mm and fin thickness down to 1.2mm, but keep fin aspect ratio under 10:1 for reliable extrusion.
How do you guarantee the flatness after anodizing for a thermal pad interface?
We mask the mounting face before anodize, then CMM-measure the final flatness to 0.03mm per 200mm and include the reading in your inspection report.
What is your actual lead time for a standard 6063-T5 profile with CNC drilling?
7 days for stock profiles with simple drilling, 10 days if we need to tap threads, and 15 days if a new die is required.
Get a Firm Quote in 12 Hours — Send Your Drawing Now
Stop guessing at thermal performance. Send us your 2D drawing or 3D STEP file for the Aluminum Extrusion Heatsink Profile, and get a firm quote with exact pricing, lead time, and tolerance confirmation within 12 business hours. Email sc@bquq.com or WhatsApp +86 13713157787. We respond in English with a PDF technical review of your design, including suggestions for reducing cost without losing thermal efficiency.
