How to Verify a Part Is Genuine OEM: Seven Checks

Counterfeit industrial equipment is not a fringe problem. Bearings, motors, drives, circuit breakers, instrumentation and control boards are all counterfeited at scale, and the counterfeits have improved to the point where visual inspection alone is no longer a reliable filter. The failure mode is what makes it serious: a counterfeit part usually works. It passes commissioning, runs for months, and fails under thermal or electrical stress at the worst possible time. These are the seven checks that actually discriminate, in the order they cost you least to perform.

Check 1 - price against the market, not against the quote

Genuine industrial equipment has a floor price set by materials and manufacturing. When a quote comes in at 40-60% below the prevailing market for the same part number, the explanation is one of a small set: it is counterfeit; it is refurbished and being sold as new; it is stolen; it is a grey-market unit diverted from a market with different pricing, carrying no warranty; or it is genuinely surplus stock, which does happen and is legitimate.

The response is not to reject the quote automatically. It is to ask the supplier to explain the price. A supplier with genuine surplus stock will tell you where it came from without hesitation. One who cannot explain a 50% discount is telling you something.

Check 2 - the part number must resolve

Every major manufacturer publishes or can confirm whether a part number is valid, what it configures to, and whether it is current or superseded. A part number that does not resolve, or resolves to a different specification than the seller describes, ends the conversation.

• Check the full string including revision and variant suffixes, not just the base number.
• Confirm the number is appropriate to the claimed manufacture date. A part number that was not issued until 2019 cannot be on a unit claimed to be 2015 stock.
• Watch for near-miss numbers - a character changed from a genuine part number is a common counterfeit tactic because it survives a casual glance.

Check 3 - serial number traceability

This is the single strongest check available to a buyer. Ask for the serial numbers before shipment, and ask the manufacturer to confirm them. Manufacturers will generally confirm whether a serial exists, what it was built as, and when.

1. 01Request serials in writing before dispatch, not on arrival.
2. 02Check that the serial on the item matches the serial on the packaging and on the packing list. Mismatches indicate re-packaging.
3. 03Check for duplicate serials across a batch - a classic counterfeit signature where one genuine serial has been replicated.
4. 04Look for evidence of serial removal or re-application: grinding marks, mismatched label adhesive, a laser mark of different depth or font from the surrounding markings.

Check 4 - packaging and labelling

Manufacturers invest heavily in packaging security because they are fighting the same problem. Current-production genuine goods generally arrive with intact manufacturer packaging, correct and current label design, holographic or other security features where the manufacturer uses them, and consistent print quality.

• Print quality: counterfeit labels frequently show slightly soft edges, incorrect font weight, or colour shifts under magnification.
• Language and typography errors on the label or in included documentation.
• Packaging that is generic, re-taped, or shows evidence of a removed original label.
• Barcodes and data-matrix codes that do not scan, or that decode to something inconsistent with the printed part number.
• Missing or generic included documentation where the manufacturer normally supplies specific certificates.

Check 5 - physical characteristics

Counterfeits save money on materials, and materials have mass. Weight is the most accessible physical check a buyer can perform without laboratory equipment.

• Weigh the item and compare against the manufacturer's published figure. Motors, transformers and contactors are commonly light because copper and lamination steel are where cost is removed.
• Inspect casting and moulding quality: flash, sink marks, rough parting lines and inconsistent surface finish.
• Check fastener quality and consistency. Counterfeits often use lower-grade fasteners.
• On electronic assemblies, look at the board: solder joint consistency, component date codes that post-date the claimed manufacture, hand-rework where none should exist, and re-flowed or re-marked ICs.
• Compare directly against a known-genuine item where one exists on site. Side-by-side comparison finds differences that neither item reveals alone.

Check 6 - the documentation package

A genuine supply chain produces paper. What should arrive with an industrial equipment shipment:

1. 01Certificate of Conformance naming the manufacturer and the part number.
2. 02Manufacturer test certificates or type test reports where the product class carries them.
3. 03Certificate of origin, chamber-attested where the destination requires it.
4. 04Packing list with serial numbers listed per item.
5. 05Calibration certificates for instruments, traceable to a national standard.
6. 06Material test reports for pressure-containing or structural components.
7. 07A statement of the supply chain - who the supplier bought from, back to the manufacturer.

The last item is the one most often absent and the most revealing. A supplier who will document their own source is confident in it.

Check 7 - the supplier, not the part

Ultimately you are buying from an organisation, and its behaviour is evidence.

• Does the supplier decline enquiries they cannot fill genuinely? A supplier who can always source everything, immediately, at a good price, is not a good sign - it is a description of someone who is not filtering.
• Do they distinguish clearly between new, surplus, refurbished and repaired, or do they use "new" loosely?
• Are they explicit about whether they are an authorised distributor or an independent supplier? Independent supply is entirely legitimate. Implying authorisation that does not exist is not, and it predicts other misrepresentation.
• Will they accept a contractual warranty of authenticity with a remedy attached?
• Do they have a physical address, a history, and references you can actually contact?

What to write into the purchase order

Verification is stronger when it is contractual. Terms worth including as standard:

1. 01A warranty that goods are new, genuine, and manufactured by the named OEM, with a right of return at supplier cost for anything that is not.
2. 02A requirement to provide serial numbers before shipment and to support manufacturer verification.
3. 03A requirement for the full documentation package as a condition of payment.
4. 04A right of inspection before dispatch, whether exercised or not.
5. 05An explicit prohibition on refurbished, repaired, reconditioned or grey-market goods unless specifically agreed in writing for that line.

Our position

We supply new and genuine OEM equipment only. Never refurbished, second-hand, reconditioned, counterfeit or grey-market. Every shipment carries manufacturer documentation, serial-number traceability and a written guarantee of authenticity. Where we cannot source something genuinely - and with obsolete control hardware that happens - we say so and propose a migration path instead of filling the order from a channel we cannot stand behind.

What "grey market" actually means, and why it is not the same as counterfeit

These terms are used interchangeably and they are different problems with different risks. Being precise about which one you are facing changes the appropriate response.

The distinction matters commercially. Buying genuine product from an independent supplier is normal industrial practice and carries little technical risk. Buying diverted or harvested product presented as new carries real risk. Buying counterfeit carries risk that can extend to safety. The verification effort should scale accordingly, and the question to ask a supplier is not "is it genuine" but "which of these is it, specifically".

What to do when you suspect a part is not genuine

1. 01Stop. Do not install it, and if it is installed and the plant permits, take it out of service.
2. 02Quarantine the item physically and label it so it cannot re-enter stores.
3. 03Photograph everything - the item, the labelling, the packaging, the documentation - before anything is disturbed.
4. 04Contact the manufacturer with the part number and serial. They have a strong interest in counterfeit identification and will usually assist.
5. 05Notify the supplier in writing, stating the basis of the concern factually.
6. 06Check whether other items from the same supplier or the same batch are in stores or installed.
7. 07Where the item was in a safety or protection function, treat it as a reportable event under your management of change and incident processes.
8. 08Preserve the item. Do not return it to the supplier until you have decided whether it is evidence.

Building verification into procurement rather than inspection

Inspecting incoming goods catches some counterfeits. Structuring procurement to avoid them catches more, at lower cost.

• Maintain an approved supplier list with documented assessment, and require justification to buy outside it.
• Require serial numbers before shipment as standard on all purchase orders above a threshold value.
• Include the authenticity warranty and remedy in your standard terms so it does not have to be negotiated per order.
• Train stores and maintenance personnel to recognise the physical indicators. The person opening the box is the last line of defence.
• Record and share findings internally. A supplier who supplied one suspect item is a supplier to reassess entirely.
• For critical spares, buy earlier and from a verified source rather than urgently from whoever answers. Urgency is the condition counterfeit supply depends on.

The categories where verification effort should be highest

Verification costs time, and the effort should be proportionate to consequence. These are the categories where counterfeit prevalence and failure consequence both run high, and where the full check sequence is justified on every order.

• Circuit breakers and protective devices, where a counterfeit that fails to interrupt turns a fault into a fire.
• Safety instrumented system components, where provenance is inseparable from the safety case.
• Bearings, which are among the most counterfeited industrial products and whose failure destroys the machine around them.
• Turbine and generator control hardware, where the secondary market is large and the outage consequence is severe.
• Hazardous-area certified equipment, where a counterfeit carries a certification mark it was never granted.
• Instrumentation in custody transfer or emissions-reporting duty, where measurement integrity has legal and financial consequences.

For commodity items on non-critical duty the full sequence is disproportionate, and a supplier assessment plus documentation review is adequate. The judgement is about consequence, not about price.