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What an NDA Should Cover When Drawings Cross Borders

September 24, 2026

An NDA is a contract, not a control. It matters, and it is worth getting right, but it is the second half of the answer. The first half is what actually happens to the file.

What an NDA can do

  • Define what is confidential, which is narrower than people assume unless it is written broadly
  • Say what the receiving party may do with it, and what it may not
  • Bind subcontractors, which is the clause most buyers forget
  • Set a term, and say what survives the term
  • Require return or destruction of files at the end
  • Set the governing law and the forum for a dispute

What it cannot do

It cannot un-see a drawing. It cannot stop a competitor learning your part exists if the shop’s floor is open. It cannot be enforced cheaply across a border, which is the practical limit: the remedy exists and using it is expensive and slow enough that it is not the real protection.

That is not an argument against signing one. It is an argument for pairing it with process.

The clauses that matter in practice

Subcontractor flow down. Your part will visit a finisher. If the NDA binds only the machine shop, the file travels to a party outside the agreement. Require flow down in writing.

Definition of confidential information. Marked documents only is a common trap, because a STEP file has nowhere to put a marking. Write it so files, drawings, models, specifications and the fact of the relationship are all covered.

Purpose limitation. Files may be used to quote and manufacture your part, and nothing else. This is what stops your geometry appearing in a capability portfolio.

No publicity. A shop that posts a photograph of your part to a social account has told everyone what you are building. This clause costs nothing and prevents a real and common problem.

Return or destruction, with confirmation. And a term that outlives the order, because the part outlives the order.

The process controls that do the real work

Ask the shop these five questions and you learn more than the contract will tell you:

  1. Who receives files, and to which address
  2. Where are they stored, and who has access
  3. Are drawings printed on the floor, and what happens to the printouts at the end of a shift
  4. Which subcontractors see the file, and are they bound
  5. What happens to the files when the project ends

A shop with real answers has done this before. A shop that has never been asked will at least start thinking about it, which is worth something on its own.

How this site handles it

A shop sees a preview first: part family, material, size, quantity, tolerance, finish, packing and destination. No name, no company, no files. If you tick the NDA box on the RFQ, nothing beyond that preview is released until the agreement is signed. The full method is on how we match and the data handling is in the privacy policy.

Practical sequence

  1. Send the RFQ with the NDA box ticked
  2. Shops evaluate fit from the preview alone
  3. The shops you want to proceed with sign, ideally mutual
  4. Files are released, with subcontractor flow down in place
  5. At project end, confirm return or destruction in writing

The audit questions that pair with this are in twenty questions to ask a machine shop.

If you have a sensitive part to quote, send the RFQ and tick the NDA box. The preview goes out, your drawing does not.

Frequently asked questions

Does an NDA actually protect a drawing?

It gives you a contractual remedy and it sets expectations. What prevents leakage day to day is process: who receives files, how they are stored, who sees them on the floor and what happens to them afterwards. Ask for both.

Mutual or one way?

Mutual is easier to sign and rarely costs you anything. A shop also has information it would rather not see shared, and a mutual agreement removes the perception that one side is dictating terms.

Can we send drawings before the NDA is signed?

You can send a preview that carries no identity and no files. That is exactly what a matching service should do by default, and it is what we do: the shop sees the part, not your drawing, until an NDA is in place if you asked for one.

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