This is a stamped zigzag heatsink produced by BQUQ, a 20-year precision manufacturing factory in Dongguan, China. It combines progressive die stamping with optional CNC finishing to give you a cooling
This is a stamped zigzag heatsink produced by BQUQ, a 20-year precision manufacturing factory in Dongguan, China. It combines progressive die stamping with optional CNC finishing to give you a cooling part that holds flatness within 0.05 mm and surface finish at Ra 0.8 µm, while maintaining a hardness of 45 HRC on the base material. Lead time is 7 days for standard sizes, and we ship globally with no MOQ.
You get a heatsink that maximizes surface area in a compact footprint. The zigzag geometry increases convective heat transfer by up to 30% compared to flat stamped fins. Every part is produced from certified aluminum or copper strip, then deburred and inspected before packing.
The stamped zigzag pattern creates a repeated fold that multiplies the effective cooling area without increasing the mounting footprint. For a 50 mm x 50 mm base, the zigzag fin structure delivers 120 mm of linear cooling edge. This is 2.4 times the surface area of a flat plate of the same size. Airflow passes through the channels naturally, which reduces pressure drop in forced convection systems by 15% versus pin fin arrays of equal height.
We design the die to control the bend radius precisely. The inner radius is held to 0.5 mm, and the bend angle is maintained at 90° ± 1°. This prevents stress cracking in the material during stamping and ensures that every fin aligns within 0.1 mm across the full length of the part. You can mount this directly to a TO-220, TO-247, or a custom IGBT module without secondary straightening.
We stock two primary materials for stamped zigzag heatsinks. Aluminum 6061-T6 is our default choice for weight-sensitive applications, offering a thermal conductivity of 167 W/m·K and a yield strength of 276 MPa. Copper C1100 is available when you need 385 W/m·K thermal performance, but it increases weight by 3 times compared to aluminum.
For high-frequency switching applications, we can also process C1020 oxygen-free copper. The stamping die is adjusted per material batch to account for springback. Aluminum springs back 0.5° to 1° per bend, while copper springs back 1.5° to 2°. Our tooling compensates for this, so the final angle always lands within your print tolerance. Hardness after forming is verified on a Rockwell tester, with aluminum at 45 HRC equivalent (Brinell 95) and copper at 40 HRC equivalent.
Our 160-ton high-speed press runs the zigzag heatsink die at 120 strokes per minute. Each stroke produces a complete fin section, and the strip moves forward automatically. This gives you a repeatability of ±0.02 mm on the fin pitch and ±0.05 mm on the overall length. The die is made from D2 tool steel, hardened to 60 HRC, and coated with titanium nitride to extend tool life beyond 500,000 hits.
We use a servo-driven feeder that controls the strip advance to ±0.01 mm. This prevents material slipping and ensures that the zigzag pattern stays perfectly aligned from the first part to the last. If you need secondary operations, we can add tapped holes, studs, or a flat mounting surface via our in-house CNC milling. This is where our CNC cutting tool selection guide becomes relevant — the right end mill geometry keeps the machined base free of burrs and achieves the Ra 0.8 µm finish you see in the final inspection report.
When you bolt this heatsink to a power device, any gap in the interface creates a thermal barrier. We control flatness on the mounting surface to 0.05 mm total indicator reading (TIR) across the entire base. This is achieved by using a precision-ground die plate and by stress-relieving the strip before stamping. The strip is leveled through a 5-roll straightener, which removes coil set and reduces internal stress.
After stamping, every part is checked on a granite surface plate with a dial indicator. Parts that exceed 0.05 mm flatness are rejected, not reworked. This ensures that your thermal paste layer is consistently thin, typically 0.02 mm, which translates to a thermal resistance of 0.15°C/W for the interface. This is a direct benefit of our CNC machining tolerances guide — we apply the same tolerance logic to stamping as we do to machined components.
Each lot of stamped zigzag heatsinks is inspected with a CMM (coordinate measuring machine) for critical dimensions, a profilometer for surface finish, and a hardness tester for material certification. We provide a full inspection report with every shipment, including dimensional data for all 10 points measured per part. The report shows actual values, not pass/fail marks.
We also perform a salt spray test on a sample from each production run to verify the anodizing layer, if you choose black anodizing (MIL-A-8625 Type II). The standard coating thickness is 18 µm, which passes 300 hours of salt spray without corrosion. For bare aluminum, we apply a clear chromate conversion coating that prevents oxidation during storage and shipping. This is done in-house, so we control the cycle time and quality.
Zigzag fins are fragile when exposed to impact during transit. We pack each heatsink in a corrugated tray that has custom-cut slots for every fin. The tray is then placed in a rigid carton with foam end caps. This prevents the fins from bending or scratching during air or sea freight.
For high-volume orders, we use anti-static bubble wrap between layers and a moisture barrier bag with desiccant. Our standard export packaging is a 5-layer corrugated box, tested to withstand a 1.2-meter drop. You can specify your own packaging requirements, such as wooden pallets or individual poly bags with barcode labels. We have shipped over 2 million stamped parts to 40 countries without a single damage claim in the last 5 years.
We keep standard dies for common zigzag sizes (25 mm to 150 mm length) ready on the press. This means a prototype is shipped in 3 days, and production quantities of 1,000 parts are completed in 7 days. Because we are the factory, there is no middleman markup. For a 50 mm x 30 mm aluminum zigzag heatsink, the unit price is $0.85 at 1,000 pieces, dropping to $0.45 at 50,000 pieces.
Custom shapes require a new die, which takes 10 working days and costs $800 to $2,500 depending on complexity. The die belongs to you after the first order. We offer free design for manufacturability (DFM) feedback within 24 hours of receiving your drawing. With no MOQ, you can order 10 pieces for testing or 100,000 for production — the same quality control applies to both.
| Specification | Value |
|---|---|
| Material | Aluminum 6061-T6 or Copper C1100 |
| Hardness | 45 HRC (Al), 40 HRC (Cu) |
| Fin thickness | 0.5 mm – 2.0 mm |
| Fin pitch | 2.0 mm – 5.0 mm (±0.02 mm) |
| Overall length tolerance | ±0.05 mm |
| Flatness (mounting surface) | 0.05 mm TIR max |
| Surface finish | Ra 0.8 µm (CNC milled base) |
| Bend angle accuracy | 90° ± 1° |
| Lead time (standard size) | 7 days |
| Prototype lead time | 3 days |
| MOQ | No MOQ |
No, we have no MOQ — you can order 5 pieces for validation or 50,000 for production, and the unit price is adjusted based on quantity.
Yes, the die can be modified to change fin height from 5 mm to 25 mm and the number of folds from 3 to 12, with a tooling changeover time of 2 days.
We perform a 100% visual check for burrs and scratches, plus a statistical process control (SPC) analysis on every batch, and we provide a full inspection report with CMM data.
Send your drawing by 10 AM China time, and we will reply with DFM feedback and a prototype quote within 12 hours; the physical prototype ships in 3 days.
Send us your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We are a precision manufacturing factory in Dongguan, China, with 20 years of experience in CNC machining, stamping, springs, and heat sinks. No MOQ, no middlemen, just parts that meet your spec.
| Parameter | Capability |
|---|---|
| Materials | AL6063/6061/5052, pure copper C1100, copper-aluminum composite |
| Process | Extrusion, CNC machining, skiving, forging, die casting, stamping fins |
| Fin Types | Extruded, pin fin, skived, folded, bonded, heat pipe, vapor chamber |
| Surface | Black anodizing, clear anodizing, nickel plating, powder coating |
| Size Range | Max 1500 x 400 x 300 mm |
| Thermal Test | Thermal resistance and heat dissipation data per batch |
| Prototype | 5-7 days, no MOQ on samples |
| Inspection | CMM, thermal resistance tester, full report per batch |
