Guide
Who owns die casting tooling at an overseas supplier?
Die casting tooling is the set of part-specific steel a die caster needs to make your part: the die itself with its cavity inserts and slides, the trim die that removes the gates and overflows, and the fixtures and gauges used to machine and check the casting. Who owns it is not settled by who paid for it. It is settled by what the purchase contract says, and by whether you can prove it on the supplier’s floor when you need the steel back.
By Saola Manufacturing engineering team · Published · Updated
This guide is for engineers and sourcing managers who are about to pay for a die, a trim die or a stamping die at a supplier outside their own country. It is general contracting guidance built from public legal texts, not legal advice, and it does not describe any one supplier’s terms.
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Who owns die casting tooling when an overseas supplier builds it?
The party the written contract names as owner holds title, and without such a clause the answer depends on the governing law and on facts that are hard to prove from another country. Paying a tooling invoice is evidence of a deal, not a transfer of title on its own.
Most disputes over overseas tooling start the same way. The buyer pays a line on a quote that says “tooling” or “mold charge”, the die is built and kept at the supplier, and nobody writes down what that payment bought. Several very different deals hide behind that one line. The buyer may have bought the die outright. The buyer may have paid a share of its cost while the supplier keeps title and recovers the rest in the piece price. Or the payment may simply be a non-refundable engineering fee, with the steel remaining the supplier’s asset.
These lead to opposite answers when the relationship ends. If you intend to own the tooling, the purchase order or a separate tooling agreement should say so in plain words, list the tools by number, and state that title passes to you on payment, not on delivery of parts. If the supplier is keeping title, that should be written too, so the piece price and the exit terms can be judged with the real deal in view.
Which tools count as tooling on a die-cast part?
Everything made specifically for your part should be listed: the die and its inserts, the trim die, machining fixtures, check gauges and, where the part is also pressed, any stamping dies. A clause that says only “the mold” leaves the rest unowned on paper.
A useful public benchmark for the scope is the definition of special tooling in the US Federal Acquisition Regulation (FAR 2.101). It covers jigs, dies, fixtures, molds, patterns, taps and gauges, with their components, when they are so specialized that without substantial modification their use is limited to particular parts. It also draws a line the other way: general machine tools and capital equipment are not special tooling. The die casting machine, the trim press and the CNC machines belong to the supplier; the steel that only makes your part is what a tooling clause should cover.
Die-cast programs carry more of these pieces than buyers expect. The trim die is a separate tool with its own wear and its own replacement cost, and the fixtures that hold a casting for its machined bores and faces are part-specific too. On the die casting and stamping pages you can see the kind of part families where a die, a trim tool and a pressing die all end up on one drawing. Give each tool a number on the purchase order so every later clause can point to it.
What should a tooling ownership clause cover?
At minimum it should cover title, identification, maintenance, die life and replacement, risk of loss, exclusive use, design data and retrieval. The table maps each item to the public text that shows why it matters.
| Clause | What to write | Why, and the public model |
|---|---|---|
| Title | Title to each numbered tool passes to the buyer on payment and is not affected by the tool being installed in the supplier’s equipment | FAR 52.245-1(e) keeps title with the owner even when property is attached to someone else’s property |
| Identification | Buyer name and tool number permanently marked on each die, trim die and fixture; tool register kept by both sides | FAR 52.245-1(f) requires owner property to be identified as such and recorded |
| Maintenance | Who pays for routine polishing, repairs and insert replacement, and that repairs are logged | NADCA lists thermal shock and stress, and die wash erosion of die steel, among the conditions a die faces |
| Die life and replacement | Expected shot life in the quote, a shot counter or log, and who pays for a replacement die once that life is reached | Wear is certain; only the split of its cost is negotiable |
| Risk of loss | Supplier holds the tools as bailee, keeps them insured, and reports damage | FAR 52.245-1 makes the contractor responsible for controlling and protecting owner property it holds |
| Exclusive use | Tools are used only for the buyer’s orders; no parts sold to others from them | The steel embodies the part design |
| Design data | Die design files, trim die drawings and process settings delivered or escrowed with the tool | A die without its design data is hard to repair elsewhere |
| Retrieval | Release on written request, packing and export paperwork duties, and a fixed notice period before scrapping idle tools | Michigan’s statute lets an end user take title to idle tools for destruction after notice if nothing else was agreed in writing |
| Written form | Ownership terms and any later changes signed in writing | Vietnam’s CISG declaration requires writing where a party has its place of business there |
Maintenance and die life are where buyer and supplier interests split most sharply, because a die caster that owns nothing in the tool has little reason to spend on it near the end of its life. The North American Die Casting Association calls the operating conditions of a die severe: the tool steel takes some level of thermal shock and stress, and die wash erodes the steel where metals that tend to attack it flow over the die surfaces (NADCA, tooling costs). A clause that names who pays for repairs and at what point a replacement die is due keeps that wear from turning into a quality argument later.
How do you prove you own a die that sits in another country?
Keep a paper trail that matches the steel: a signed tooling agreement, a paid invoice that names each tool, a marking on every tool, and dated photographs of those markings. Each piece supports the others; none is strong alone.
The federal property clause is a good template for the record. It asks the party holding someone else’s property to receive it, identify it as the owner’s in a manner appropriate to the item, and keep records of it (FAR 52.245-1). For a die, a practical version is a stamped or engraved plate on the die frame with your company name and tool number, the same numbers on the trim die and fixtures, and a one-page tool register listing each item with its first-article date and current condition.
Does owning the die change the customs value of imported parts?
It can: when a US buyer supplies dies or molds to a foreign producer free of charge or at reduced cost, CBP treats them as an assist whose value is added to the transaction value of the imported parts.
The definition is in the customs regulations. An assist includes tools, dies, molds and similar items used to produce the imported goods, when the buyer supplies them directly or indirectly, free of charge or at reduced cost (19 CFR 152.102). The next section sets the value: the cost of acquiring the tool, or of producing it if the buyer or a related party made it, plus transport to the place of production, reduced for prior use and possibly increased by repairs or modifications (19 CFR 152.103).
CBP’s own plain-language guide gives the tooling example directly: molds supplied free of charge are a required addition to transaction value regardless of where they were made, and the value is apportioned to the imported goods using a reasonable method, such as over the first shipment or over the expected production (CBP Informed Compliance Publication, Customs Value). The practical point for a tooling agreement is that the ownership model, and who paid whom for the steel, should be visible to whoever files your entries. Share the tooling agreement with your customs broker before the first shipment and ask how the tooling payment will be reported.
What happens to your tooling when you stop ordering?
Whatever the agreement says, and if it says nothing, the holder may eventually gain the right to scrap it. Put the notice period, storage terms and release steps in writing before the first shot.
Michigan’s Special Tools Lien Act is a clear public example of what silence can cost. Unless otherwise agreed in writing, if a customer does not claim a special tool from the end user within three years of its last use, the end user may choose to have title transferred for the purpose of destroying the tool, after the written notice the Act requires (MCL 570.543). The customer then has 120 days after the end user receives the return receipt of that notice to claim the tool or arrange storage (MCL 570.547).
That is one state’s rule and it does not reach a factory in Asia, but the logic travels. A supplier cannot store idle steel forever, and a buyer who has not planned the exit will find the die either scrapped or held pending a dispute. The fix is in the same clause: a notice period before any scrapping, a storage charge if you want the tool kept idle, and a release process that names the documents needed to ship it. Moving a working die to a new caster also means a new first-article inspection, which is a topic of its own.
What changes when the supplier is in Vietnam?
The clause checklist is the same, but the contract form matters more: Vietnam has joined the UN sales convention (CISG) with a declaration that contracts and their changes involving a party based in Vietnam must be in writing.
Vietnam and the United States are both parties to the United Nations Convention on Contracts for the International Sale of Goods. The UNCITRAL status record shows that Vietnam made the declaration allowed under articles 12 and 96, so the convention’s provisions that let a contract, its modification or its termination be made in a form other than writing do not apply where a party has its place of business in Vietnam (UNCITRAL, CISG status). For tooling that means an email thread agreeing that you “own the die” is a weak basis. Put the tooling agreement on paper, signed by both companies, and sign any amendment the same way.
Three habits help with any supplier outside your home market. Name the governing law and the forum or arbitration seat, because a clause you cannot enforce is only a statement of intent. Make sure the contracting party on the tooling agreement is the same legal entity that holds the tools, which you can check against its business registration. And if the agreement is bilingual, say which language controls.
Frequently asked
If I paid for the die, do I own it?
Not automatically. Payment shows a deal was made; the written terms decide whether that deal was a purchase of the steel, a shared cost or a fee. Ask for a clause that names each tool and states that title passes to you on payment.
Does the trim die need its own line in the agreement?
Yes. It is a separate tool with its own wear and replacement cost, and the casting is of little use without it. List it, and any machining fixtures and gauges, by tool number.
Who pays when a die wears out?
Whoever the agreement says. Die wear in normal service is expected, so agree the expected shot life, how shots are logged and who pays for the replacement before the first production run.
Do I need to declare buyer-supplied tooling to CBP?
Dies and molds you supply free of charge or at reduced cost are assists under the customs valuation rules, and their apportioned value is added to transaction value. Your customs broker decides how it is reported on the entries.
What should I send with an RFQ so tooling is quoted clearly?
The drawing, the alloy, expected annual volume and a note asking for tooling to be quoted as separate numbered items with the ownership model stated. The RFQ preparation guide has the full checklist, the FAQ covers general quoting questions, and you can send a drawing for a quote.
What are the downsides of die casting?
The die is the large up-front cost, and changing the design after it is cut is expensive, so die casting pays only at volume; the break-even guide shows where that line falls. Internal porosity is the other limit: it affects sealing faces and is why most high-pressure die castings are not welded, which is covered in porosity after machining.
Sources
- FAR 2.101 Definitions (special tooling), Federal Acquisition Regulation, current text accessed September 2026
- FAR 52.245-1 Government Property, paragraphs (e) and (f), Federal Acquisition Regulation, current text accessed September 2026
- 19 CFR 152.102 Definitions (assist), eCFR, accessed September 2026
- 19 CFR 152.103 Transaction value, paragraph (d) assists, eCFR, accessed September 2026
- What Every Member of the Trade Community Should Know About: Customs Value, US Customs and Border Protection, revised July 2006
- Special Tools Lien Act, MCL 570.541 to 570.547, Michigan Legislature, Act 481 of 2002
- Status: United Nations Convention on Contracts for the International Sale of Goods (Vienna, 1980), UNCITRAL, accessed September 2026
- Tooling Costs, NADCA Design, North American Die Casting Association, accessed September 2026