Product-specific sourcing · China
Heatsink OEM Sourcing in China
Compare China heatsink OEM suppliers by process route (extruded, skived, bonded-fin, CNC, forged), alloy/temper, fin geometry, base flatness, anodizing, CNC secondary ops, die/NRE, MOQ, samples and documents — buyer-side RFQ fields for discrete thermal metal parts, not factory marketing or retail CPU coolers.
Buyer context
Make the technical and commercial basis comparable first.
Heatsink quotes look similar until process route, alloy, fin geometry, base flatness/TIM interface, finish, die ownership and MOQ layers are written down. Sephalis makes those fields explicit so quotations stay comparable; supplier thermal performance claims stay separate from buyer engineering sign-off. Sephalis is a buyer-side sourcing intermediary and does not manufacture heatsinks or certify Rth/ΔT, anodize quality or market access. Use this page for discrete aluminum (primary) and copper (specialty) heatsinks; use /electronics-sourcing-china/electronic-enclosures when the part is a housing (even with fins); do not use this page for fans, liquid cold plates, or standalone heat pipes. TIM sheets, grease and silicone foam are out of scope as primary products.
What buyers usually need to compare
Use these fields to keep quotations tied to the same technical, production and packaging assumptions.
✓ Process route preference (extruded + cut/CNC · skived · bonded / zipper fin · CNC from billet · cold-forged pin-fin) and why that route fits volume and geometry — or open for DFM with assumptions stated
✓ Alloy and temper (aluminum 6063-T5/T6, 6061-T6, Al 1070 forge, copper specialty, or other) — or open with assumptions written on the quotation
✓ Overall envelope / cut length and critical dimensional tolerances from the buyer drawing or stock-profile + cut note
✓ Fin geometry (thickness, height, gap / aspect ratio) or "per drawing", plus extrusion or skive feasibility note request when relevant
✓ Base / TIM interface: flatness target, Ra if controlled, datums and masking for the contact face — RFQ fields, not Sephalis guarantees
✓ Secondary CNC scope (holes, threads/inserts, milling steps, deburr, clean) and hardware assumptions
✓ Surface finish (mill · clear/black Type II anodize · hard Type III · powder · chromate) plus masking and cosmetic-zone expectations
✓ Thermal context as buyer assumptions only (heat load W, ambient, natural vs forced airflow / approximate CFM, ΔT or Rth target if any) — for comparable quotes, not Sephalis thermal design or certification
✓ Straightness / twist / bow expectations at cut length — supplier statement
✓ Optional add-ons in scope? (none · TIM pad attach · fan/shroud kit · embedded heat pipe / VC) — claim-only unless the buyer owns the design; not primary product scope on this leaf
✓ OEM / customisation tier (stock profile cut · light machine · new extrusion die · full custom CNC/forge)
✓ MOQ by process and finish layer; sample / first-article (FAI) cost and sample lead time
✓ NRE / die cost, tooling ownership wording, production lead time and quantity breakpoints
✓ Documents to request with the quotation (material cert, RoHS/REACH claim, FAI/CMM, flatness report, finish/anodize note; thermal test report only if the buyer requires it — supplier claim, not Sephalis certification)
Evidence worth collecting before the next decision
Sephalis keeps supplier statements, technical evidence and unresolved questions separate so the buyer can see what is known and what still needs engineering or specialist review.
✓ Buyer drawing package (STEP/IGES + revision-controlled 2D PDF) or agreed stock profile ID + cut/modify note — buyer-verified once revision locked
✓ Written alloy/temper and process route on the quotation — commercial / agreed basis
✓ Supplier statement on base flatness method, sampling plan and any Ra claim — supplier claim
✓ Finish / anodize note or chip reference plus masking map when offered — supplier-provided
✓ Written sample / first-article (FAI) terms and production lead time — commercial
✓ Quotation with MOQ, die/NRE, tooling ownership and exclusions — commercial
✓ Packaging method for fin protection stated on the quotation — commercial
✓ Supplier-provided material cert / RoHS / REACH / QMS copies where offered — supplier claim / document (not Sephalis certification or market approval)
✓ Unresolved items called out as unknown until buyer or specialist closes them: measured Rth/ΔT vs claim, report-to-model match for any thermal test, die ownership wording, anodize thickness lot consistency, copper vs aluminum substitution risk
Commercial comparison
Separate one-time development cost from recurring unit cost.
For electronics, tooling, NRE, programming, test fixtures, artwork and prototype charges may sit outside the production unit price. A useful comparison keeps those charges visible together with MOQ, lead time, packaging and FOB terms.
Technical boundary
Supplier documents are evidence, not automatic approval.
Sephalis can collect specifications, quotations, supplier documents and samples. Formal electrical safety, radio, battery transport, engineering validation, product compliance and market-access decisions remain separate questions for the relevant specialists and authorities.
Common buyer questions
Short answers below describe the sourcing workflow rather than engineering or regulatory approval.
When should I use heatsinks vs electronic-enclosures, led-drivers or pcb-assembly?
Use /electronics-sourcing-china/heatsinks for discrete extruded, skived, bonded-fin, CNC or forged aluminum (or copper) heatsinks — process route, alloy, fin geometry, base flatness, anodize, die/NRE and documents. Use /electronics-sourcing-china/electronic-enclosures when the part is the housing, including integrated fins or heat-sink features cast or extruded into the box. Use /electronics-sourcing-china/led-drivers for the electrical LED driver module (CC/CV, dimming, IP/PFC); keep a separate metal heatsink buy on heatsinks. Use /electronics-sourcing-china/pcb-assembly when the deliverable is Gerber/BOM PCBA and heatsink attach or assembly is only an assembly-scope note — a purchased discrete metal heatsink still belongs on heatsinks. Keep each RFQ on the matching page so suppliers quote the same product scope.
Does Sephalis manufacture or certify heatsinks or thermal performance (Rth / ΔT)?
No. Sephalis is a buyer-side sourcing and supplier-research service. It helps compare heatsink manufacturers and collect drawings, quotations, samples and supplier documents. Manufacturing capability claims, Rth/ΔT marketing, anodize quality statements and any certificates remain with the supplier; formal thermal engineering sign-off, lab verification or market-access approval stays with the relevant specialists. Sephalis never certifies Rth or ΔT.
How should extruded vs skived vs bonded-fin vs CNC quotes stay comparable?
Name the preferred process route (or ask for a recommended route with assumptions stated on the quotation) before comparing unit price. Extruded + cut, skived, bonded/zipper fin, CNC billet and cold-forged pin-fin are different products with different tooling, fin aspect ratios and NRE. Two quotes on different process routes are not price-comparable until process, alloy/temper and drawing revision appear on the same brief.
Why must base flatness and TIM / airflow assumptions appear in the RFQ?
Fins can look fine in photos while a warped or poorly finished TIM face ruins contact and thermal behaviour. Put base flatness (and Ra if controlled), TIM interface assumptions and airflow context (natural vs forced, approximate CFM, or "unknown") in the RFQ so suppliers answer the same mechanical and application brief. Treat any Rth or ΔT numbers as buyer targets or supplier claims — not Sephalis design or certification.
How should die/NRE, MOQ and lead time be compared?
Ask each supplier to separate stock-profile cut versus new extrusion die or custom CNC/forge tooling; split unit price from die/NRE; state tooling ownership in writing; and split sample/FAI cost and sample lead time from production MOQ and production lead time. Note how finish (anodize) and secondary CNC change minimums, and how fins will be protected in packaging. A low MOQ claim is not comparable until those lines are written down.
Is a retail CPU cooler, cooling fan, liquid cold plate or TIM sheet the same RFQ as a heatsink?
No. This page is for discrete OEM heatsinks as thermal metal parts (aluminum primary, copper specialty). Retail CPU/GPU coolers with fans, cooling fans or blowers as primary products, liquid cold plates, standalone heat pipes or vapor chambers, and TIM pads/grease/graphite sheets as primary products are out of scope here — optional TIM, fan kit or embedded HP/VC appear only as buyer-listed supplier-claim add-ons when the metal sink remains the RFQ focus. If the primary buy is a discrete OEM DC cooling fan or blower, use /electronics-sourcing-china/cooling-fans; keep heatsinks when the metal sink remains the RFQ focus. If the part is a housing with integrated fins, use /electronics-sourcing-china/electronic-enclosures instead.
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