What an aluminium extrusion die for heat sinks actually costs in 2026, how long it lasts, who should own it, and how to calculate tooling amortisation per part.
Heat Sink Extrusion Die Cost and Tooling Amortisation
Direct answer: An aluminium extrusion die for a heat sink profile typically costs USD 800-3,500 in China in 2026, depending on section complexity, width and whether it is a solid or hollow profile. Die life is usually 3-8 tonnes of extrusion, roughly 15,000-40,000 metres, before refurbishment. Die casting tooling is far more expensive at USD 6,000-35,000, and stamping dies sit at USD 4,000-25,000. CNC machining needs no die but does carry programming and fixturing cost.
Tooling cost by process
| Tooling type | Typical cost (USD) | Lead time | Expected life | Owner question |
|---|---|---|---|---|
| Extrusion die, simple solid profile | 800-1,500 | 7-12 working days | 3-6 t of extrusion | Usually charged to first order, sometimes supplier-owned |
| Extrusion die, thin-fin heat sink profile | 1,500-3,500 | 10-15 working days | 3-8 t | Charge separately and secure ownership in writing |
| Extrusion die with hollow chambers | 2,500-6,000 | 15-20 working days | 3-5 t | Porthole or bridge die, higher maintenance |
| Die casting die (aluminium) | 6,000-35,000 | 25-40 working days | 80,000-150,000 shots | Almost always customer-owned; state shot count and maintenance responsibility |
| Cold forging die set | 4,000-15,000 | 20-30 working days | 100,000+ pcs | Customer-owned typical |
| Progressive stamping die | 8,000-40,000 | 25-45 working days | 500,000+ strokes | Customer-owned typical |
| CNC programming and fixturing | 150-800 per part number | 2-5 working days | n/a (reusable) | One-off, should not be charged again on repeat orders |
These are working ranges, not quotations. The single biggest driver of extrusion die cost is fin geometry: fins thinner than 0.8 mm or a fin-to-gap ratio below 1:1.2 require a higher-grade die steel and more polishing hours, and can double the die price.
The economics the quote does not show you
A die is a fixed cost spread over a quantity. That is why the same heat sink can be USD 22/pc at 200 pcs and USD 9/pc at 5,000 pcs without the supplier changing margin by a cent.
Worked example: a die at USD 2,000 amortised over 400 pcs adds USD 5.00 per piece. Over 4,000 pcs it adds USD 0.50. If the factory absorbs the die into piece price, it will price defensively and you pay for it either way.
| Order quantity | Die cost USD 2,000, amortised | Effect on a USD 8.50 base part |
|---|---|---|
| 200 pcs | +10.00 | 18.50 (+118%) |
| 500 pcs | +4.00 | 12.50 (+47%) |
| 2,000 pcs | +1.00 | 9.50 (+12%) |
| 5,000 pcs | +0.40 | 8.90 (+5%) |
| 20,000 pcs | +0.10 | 8.60 (+1%) |
The conclusion for a first order is not to negotiate the die price. It is to right-size the first order so the amortisation lands somewhere sensible, or to accept that a first small batch is a validation cost.
Who should own the die
Three models exist and they are not equivalent:
- Supplier owns the die, amortised into piece price. Simplest and cheapest up front. The risk is that if you move the part, you start again from zero. Acceptable when the volume is long-term and the supplier is stable.
- Customer pays the die separately and owns it. Best practice for parts you intend to dual-source or hold for several years. The die is your asset, stored at the supplier, and you have a written right to transfer it.
- Supplier owns the die and charges nothing. This sounds ideal and usually means the die cost is hidden in piece price at a higher rate, or the die is a standard profile shared with other customers and you have no exclusivity.
Whichever model applies, put four things in the PO: who owns the tooling, where it is stored, what the transfer conditions are, and what maintenance the supplier performs and at whose cost.
Die life, maintenance and the hidden cost of a worn die
An extrusion die does not fail suddenly. It wears at the bearing surfaces, so the profile slowly grows and the fin thickness drifts. On a heat sink with a 1.0 mm fin, a 0.08 mm drift is 8% and it changes both weight and thermal resistance. If nobody measures it, you find out when the customer measures the fin.
Practical maintenance expectations: re-polishing every 1-2 tonnes of extrusion, bearing rework or replacement every 3-5 tonnes, full replacement at 3-8 tonnes depending on how much abrasive the alloy and the die coating tolerate. Ask the supplier for a die maintenance record before you place a repeat order. A factory that cannot produce one is not tracking die condition.
What changes tooling cost most, in order
- Fin thickness and pitch. Thinner and denser fins mean more die steel stress and more polishing. This dominates everything else.
- Hollow sections. A hollow heat sink body needs a porthole or bridge die, which is more expensive to build and to run.
- Profile width. Width drives press tonnage. A profile that needs a bigger press may need a bigger die.
- Alloy. 6063 is the standard. 6061 or 6005A extrusions run slower and wear dies faster.
- Tolerance class. A tighter dimensional callout requires more die trials and more frequent bearing correction.
Frequently asked questions
Is the extrusion die cost refundable?
Sometimes, on a volume commitment. Factories may waive or rebate the die after an agreed cumulative quantity, typically 5-10 tonnes. Get the threshold in writing before you assume it.
How long does it take to get a new die?
Simple solid profiles run 7-12 working days; thin-fin functional heat sink profiles 10-15 working days; hollow profiles 15-20 working days. Add 5-8 days for a die trial and correction cycle if the first trial does not fill the fins.
Can I use one die for several heat sink lengths?
Yes. An extrusion die defines the cross-section, not the length. One die can serve a 50 mm, 120 mm and 200 mm long heat sink, with different cut lengths and CNC programs. This is the cheapest way to get variety from a single tooling spend.
What happens to the die if I stop ordering?
Depends on ownership. If you own it, the supplier should store it and hand it over on request, sometimes for a storage fee. If the supplier owns it, they may scrap or reuse it. Settle this at the start, not after the relationship ends.
Send the profile drawing and annual volume and we will return the die cost, the expected life at your order pattern, and the amortised piece price at three quantity levels.
Heat sink sourcing guides
- Aluminum Heat Sink Price per kg: 2026 Cost Breakdown
- Custom Heat Sink MOQ and Lead Time by Process
- Heat Sink RFQ: What to Send for an Accurate Quote
- Heat Sink Tolerance and Flatness: What to Specify
- Heat Sink Surface Finish Options and Cost Impact
- Heat Sink RoHS, REACH and UL Compliance Explained
- Heat Sink Volume Pricing: How Breakpoints Really Work
- Heat Sink Prototype and Sample Service: What to Expect
- Heat Sink Packaging, Shipping and DDP Terms
- Heat Sink Supplier Audit and Second Sourcing
- Heat Sink Thermal Test Report: What the Data Package Contains
