When is die cast right?

When the heatsink is also the housing — trading alloy conductivity for one-shot integration within ADC12 limits.

Copper doubles conductivity but triples weight and cost; heat pipes in aluminium usually win except on envelope.

Yes — hybrid designs such as extruded fins with machined bases are included in comparisons when they win.

Heatsinks in China — Extruded, Forged, Die Cast & Machined

Different heatsink manufacturing types compared

Five ways to make a heatsink — and how to pick the right one

Every heatsink RFQ hides a process decision: extrusion, cold forging, die casting, skiving or machining. Each owns a region of the fin-density / volume / cost map. This page is the comparison we walk customers through — written by the P&A International engineers who run all five routes through ISO 9000 certified or better partner plants.

If you already know your route, head to the custom heatsink service page; if not, three numbers — watts, airflow, annual volume — usually decide it.

Request a quote ›

Engineering-led since 2008
consultancy + manufacture

One dedicated engineer
per project, end-to-end

10–15-day prototypes
qualified samples with test data

ISO 9000 partner network
every supplier certified or better

Route-neutral advice
we run all five — no process to push

The five routes at a glance

Extruded

6063 profiles, fin ratios to ~25:1, die cost from ~USD 800 — the default until proven otherwise.

Forged

Pin fins in Al 1070 or copper — best conductivity and omnidirectional flow, higher tooling.

Die cast

Fins and housing in one ADC12 shot — wins on part count, loses on alloy conductivity.

Skived & machined

Fins peeled from solid for extreme density; machining for prototypes and flatness-critical bases.

Rule of thumb: if an extrusion can do it, an extrusion is cheapest. The art is knowing when it cannot.

Engineering capability

Extrusion: best cost per watt for most forced-air duties; profile width to ~350 mm circle
Cold forging: Al 1070 (~226 W/mK) and copper pins; omnidirectional airflow
Die casting: ADC12 (~96 W/mK) heatsink-housings — design for the lower conductivity
Skiving: fin density beyond extrusion limits, from 1100 aluminium or copper plate
Machining: one-offs, flatness to 0.05 mm, and post-ops on all other routes
All routes: anodise/chromate finishing, heat pipe embedding, fan assembly

At a glance

Extruded	High volume, moderate density — lowest cost
Forged	Pin fins, premium conductivity — medium tooling
Die cast	Housing integration — alloy limits performance
Skived	Extreme fin density — premium price
Machined	Prototypes and precision bases — no tooling

Start your project with one dedicated engineer ›

Why engineers & buyers choose PA

For design engineers

Process-neutral advice only exists where every process is available: we have no press time to fill and no die quota to hit, so the comparison lands on the route your watts and volumes actually justify.

For purchasing

One RFQ covers all five routes with itemised tooling and piece pricing side by side — and whichever wins, the same ISO 9000 certified or better network and the same accountable engineer deliver it.

3 easy steps to get started

Send three numbers

Watts, airflow (or natural convection), annual volume — plus the envelope.

Route comparison

The viable routes priced side by side with thermal margins stated.

Samples on the winner

Measured first articles, optional thermal test, then production.

Applications

The same comparison logic serves LED fixtures, inverters and drives, telecom amplifiers, embedded computing, battery systems and audio — only the winning route changes with the watts and the volumes.

Ready to quote? Go to the custom heatsink service. Deep dives: aluminium extrusion, aluminum die casting and heat pipes.

Quick selector

Start here; the engineering review confirms or corrects:

Forced air, volume part	Extruded — almost always
Fan blows from any direction	Forged pin fin
Heatsink IS the enclosure	Die cast, designed for ADC12 conductivity
Dense fins, tight space	Skived
Ten prototypes by Friday	Machined

What to send us for a fast, accurate quote

The more of this you can share, the quicker we can return a proposed route comparison and price:

Heat load (W) and ambient
Airflow situation: natural, ducted, fan CFM
Envelope: length, width, height limits
Annual volume
Mounting and electrical isolation needs

Unsure of the watts? Send the device part numbers — the datasheets tell us.

📄 Download the Heatsink Route Selector (PDF)

Get a quote

Send watts, airflow and volume — one dedicated engineer will reply with the route comparison and pricing for the winner.

One dedicated engineer reviews every enquiry and replies with a proposed route comparison and indicative pricing. Your details are used only to respond to your enquiry. Prefer email? support@pa-international.com.au

Frequently asked questions

Why is extrusion usually cheapest?

Die costs start around USD 800 and amortise over thousands of metres, the 6063 alloy machines and anodises beautifully, and fin geometry up to about 25:1 covers most forced-air duties.

When is die cast the right answer?

When the heatsink is also the housing: LED fixtures, telecom enclosures, motor end-bells. You trade alloy conductivity for one-shot integration — the design must respect ADC12 limits.

What does skiving offer over extrusion?

Fin density and thinness extrusion cannot reach, peeled from high-conductivity solid plate — at a premium that only dense, space-limited duties justify.

Is copper worth it?

Copper roughly doubles conductivity over standard aluminium but triples weight and multiplies cost; embedded heat pipes into aluminium usually beat solid copper on every axis except envelope.

Can you mix routes?

Constantly — extruded fins with a machined base, forged pins on a vapor chamber, cast housings with skived inserts. The comparison includes hybrids when they win.