How to Verify an Overseas Manufacturer Before You Pay

Most sourcing losses do not come from bad manufacturing. They come from paying a company that was never going to manufacture anything.

The supplier who takes a deposit and disappears, the trading company presenting itself as a factory, the plant that genuinely exists but cannot hold the tolerance it agreed to - these are different failures with different defences. What follows is the sequence we use, in the order that spends the least money to eliminate the most risk.

Stage 1 - Legal existence and scope

Before anything technical, establish that the company exists and is permitted to do what it claims.

Business licence or registration certificate. Get the original-language document, not an English summary. Check the registration number against the relevant national registry.
Scope of activity. This is the check most buyers skip and the one that catches the most trading companies. A manufacturing licence and a trading licence are different registrations. A company whose licence permits only trade is not a factory, whatever the website says.
Registered address versus operating address. These legitimately differ. A registered address in an office district with no declared production site anywhere is a different matter.
Ultimate beneficial ownership. Who actually controls the entity, and are they subject to any sanctions or restrictions relevant to your jurisdiction?
Export registration. In many countries manufacturing and exporting require separate authorisations.

This stage costs very little and eliminates a meaningful share of candidates.

Stage 2 - Financial standing

A supplier that fails mid-order costs you the deposit, the schedule, and the cost of starting over.

Credit report, where available in the jurisdiction.
Trade credit insurance eligibility. Ask whether a credit insurer will cover exposure to this counterparty and at what limit. If a professional underwriter declines the risk, that is a considered opinion worth having.
Litigation and enforcement records. Many jurisdictions publish court and enforcement filings. A pattern of supplier disputes is informative.
Working capital relative to your order. A factory whose annual revenue is a small multiple of your order value cannot absorb a raw material price move without pressure on your contract.

Stage 3 - Certification, verified rather than collected

Certificates arrive as PDFs. PDFs are trivially edited.

Every certificate carries a number and an issuing body. Every serious issuing body maintains a public register. Check the number on the register, not the document. This takes minutes and catches lapsed certificates, certificates issued to a different entity, and certificates that were never issued at all.

Understand what each one actually says:

ISO 9001 - a documented quality management system exists and is followed. Says nothing about your product meeting your specification.
ISO 13485 - quality management for medical devices. Necessary but not sufficient for healthcare supply; registration with the destination regulator is separate.
CE marking - a manufacturer’s declaration of conformity with applicable EU directives. For many product categories it is self-declared, not independently assessed.
API monogram - genuinely rigorous, licensee-specific, and verifiable on the API composite list. Directly relevant to oil and gas equipment.
Product test reports - check the sample identification, the test date, and whether the laboratory is accredited. A three-year-old report for a different variant is not evidence about your order.

Stage 4 - Technical capability

Now test whether they can make your part specifically.

Machine list. Types, quantity, make, and age. Cross-reference against what your part requires.
Capacity and current loading. Monthly output against orders in hand. A factory running at capacity will either delay you or subcontract you.
Subcontracting policy. Which operations are done in house and which are outsourced? Heat treatment, plating and specialist finishing are commonly outsourced, which is fine if disclosed and controlled - and a serious problem if it emerges after a failure.
In-house testing. What can they measure themselves, and is the equipment calibrated to a traceable standard?
A technical question with a specific answer. Ask which machine runs your part, what tolerance it holds, and what the process capability is. A producer answers immediately. A trading company goes away and comes back.

Stage 5 - The on-site audit

For any significant or ongoing supply, someone competent walks the plant. It does not have to be you - a third-party audit by SGS, TÜV, Bureau Veritas or an equivalent typically costs a fraction of a single container’s value.

What the audit is looking for:

The declared machines exist and run. Photographed, with serial numbers, in operation.
Production matches declared capacity. An empty floor at 11am on a Tuesday is a question.
Raw material control. Incoming inspection, segregated storage, traceable identification. Traceability that breaks at goods-in cannot be repaired downstream.
Calibration records. Current, traceable certificates for measuring equipment.
Non-conforming material control. How rejects are segregated and dispositioned. A factory with no visible reject area is either exceptional or not recording rejects.
Worker conditions. Beyond the ethical dimension, plants with severe labour problems have unstable output and unstable schedules.

A video walk requested at short notice, unscripted, with the auditor directing the camera, catches a large proportion of misrepresentation for very little cost. It is not equivalent to an on-site audit but it is far better than nothing.

Stage 6 - Sample, then golden sample

Order a production sample and test it independently against your specification. Not the supplier’s report on their sample - your test, at your laboratory.

If it passes, formalise it as a golden sample: signed, sealed and retained by both parties as the physical reference the production run is measured against. Every later batch is compared to it.

This matters because the classic failure is not a bad sample. It is a good sample followed by a bulk run made differently - cheaper material, a subcontracted process, a worn tool. The golden sample is what turns “this is not what we agreed” from an argument into a measurement.

Stage 7 - Structure the first order to be survivable

Even after all of the above, treat the first order as a controlled test.

Split payment. 30% deposit, 70% against a passed pre-shipment inspection. Never 100% in advance.
Name the inspector in the contract. “An independent inspection” invites a convenient appointment. Name SGS, TÜV, Bureau Veritas or an equivalent, and say who pays.
Reference the golden sample explicitly in the purchase order.
Write in remedies. What happens on late delivery or non-conforming goods, and how it is quantified. A clause with a number attached is enforceable; “the supplier shall use best efforts” is not.
Keep the first order small enough to lose. Not literally expendable, but sized so that a total failure is recoverable.

What this costs

Registry and certification checks: a few hours of competent work. Financial screening: modest. A third-party factory audit: typically a low four-figure sum. Pre-shipment inspection: a few hundred to low thousands depending on scope.

Set against a container of off-specification material, a missed project milestone, or a deposit wired to a company that never existed as a manufacturer, the arithmetic is not close.

The reason buyers skip it is not cost. It is that verification is slow at exactly the point when the schedule is under pressure and the supplier is being responsive and encouraging. That pressure is precisely when the sequence is worth most.

This is the framework behind our supplier identification and verification service - seven gates a manufacturer passes before we introduce it to a client. You can read how the wider sourcing process fits together, or send us a specification and we will run the qualification for you.

Common questions

How can I tell if a supplier is a real factory or a trading company?

Check the business licence for the registered scope of activity - a trading licence and a manufacturing licence are different registrations. Ask for the production capacity, machine list and shift pattern, then ask a technical question only a producer could answer, such as which specific machine runs your part and what its tolerance capability is. A trading company can source answers but rarely answers immediately and consistently. A video walk of the line, unscripted and on request, settles it quickly.

What documents should I ask a new supplier for?

A current business licence showing manufacturing scope, export registration, ISO or sector certification with a certificate number you can verify on the issuing body's register, recent test reports, and at least two customer references in your region. Verify every certificate number against the certifying body's own database rather than accepting the PDF.

Is an ISO 9001 certificate proof of quality?

No. ISO 9001 certifies that a documented quality management system exists and is followed. It says nothing about whether the product meets your specification. It is a useful baseline and its absence is a warning sign, but it is not a substitute for testing the product against your standard. Verify the certificate number on the certifying body's register - certificates that have lapsed or were never issued circulate freely.

Do I need to physically visit the factory?

Someone competent does, for any significant or ongoing supply. It does not have to be you. A third-party audit by SGS, TÜV, Bureau Veritas or an equivalent typically costs a fraction of one container's value and reliably distinguishes a real production facility from a trading office. For a first order of modest value, a documented remote audit plus pre-shipment inspection may be proportionate.