How to vet a Chinese metal-parts factory — without flying there

You don't need to fly to Shenzhen to separate the real shops from the talkers. You need to know what to ask for, and how to read the answer. Here is the remote vetting playbook I use before any factory enters the network.

What a real audit actually checks

An audit isn't a factory tour. It's four checks, in order — and most buyers stop after the first:

• Capability match. Not "do you do CNC," but "do you hold ±0.02 mm on a 400 mm aluminum frame, and can you prove it on a similar part you already run?" Match the machine list to your actual tolerances and volumes, not to the brochure.
• Process control. Do they run first-article inspection (FAI), have a CMM, and keep inspection reports? A shop that can't show you a recent report is guessing — and billing you for certainty it doesn't have.
• Track record on your part type. Have they made something like yours, for a market like yours? A die-caster with no experience in thin-wall enclosures will learn on your order, not someone else's.
• Integrity and communication. Do they push back on the drawing, or say "no problem" to everything? The second answer is almost always the more expensive one.

The remote vetting toolkit

You can run most of this from your laptop, before a single dollar changes hands:

• A live shop-floor video walk. Ask them to pan the actual machines and read the nameplates. You're checking real equipment, not a catalogue someone emailed you.
• A sample of a similar part plus its inspection report. The report matters more than the part. It shows whether they measure what they claim to measure.
• Business and export licenses. Verify the entity exists and can export. Five minutes on the registry beats a smooth sales call.
• A video call taken on the floor. If they can only talk from an office, ask why. A confident shop will walk you to the line.

Red flags that never appear in a brochure

• They show a catalogue, not the floor, and redirect when you ask for a machine walk.
• They won't name machine brands or models — serious shops are proud of their floor.
• Zero QA documentation, or "we inspect by eye."
• A price that's implausibly low for the tolerance you asked for — someone is planning to cut a corner you can't see.
• "We make everything" with no real specialization. Depth beats breadth for critical parts.

The drawing review is the cheapest quality gate

Before any quote, a capable shop will challenge your drawing: a wall too thin to cast, a tolerance tighter than the process holds, a feature that needs a fourth operation. That pushback is the signal you want. A shop that rubber-stamps the file will happily quote low and then quietly negotiate the spec down later — after your deposit. Run the review up front, on paper, and the talkers separate themselves for free.

Why a remote vet is still a real vet

Flying in is the gold standard for high-volume or safety-critical programs. For the typical sourcing decision — a batch of machined brackets, a die-cast enclosure, an extruded frame — a disciplined remote vet catches the failures that matter: wrong capability, no process control, no track record. The goal isn't a perfect audit. It's avoiding the shops that would have cost you the order.

Where I fit in

This is the first thing I do, not an upsell. I pre-screen the factory network against your part, run the drawing review, verify licenses and sample reports, and you work with one accountable engineer instead of a stranger who quoted you low. One bad supplier choice costs more than the part is worth — so we qualify them before the purchase order, not after the complaint.

See the four capability domains →

Send a drawing for a free factory screen →