Do not start with the packaging. Printing and cartons are the cheapest things to copy; start with the supply channel, then measure the pitch, then inspect the cord — a counterfeit can imitate a label far more easily than it can hold a dimensional tolerance.

That order matters because it matches what is expensive to fake. A box, a sleeve and a printed part number cost a counterfeiter almost nothing. A mould that holds pitch over a full belt length, a cord lay that stays uniform through the tooth roots, and a distributor relationship that survives an invoice check are all expensive — which is exactly why they are the checks worth running.

One boundary before the method: this article names Gates because that is the brand in question, but it describes only inspection practice that any buyer can verify for themselves. It does not list Gates-specific security features, because those could not be confirmed from an authoritative source. Where Gates publishes its own authentication guidance, that guidance takes precedence.

Why the packaging check fails first

Counterfeit belts usually arrive in packaging that looks right, because packaging is a printing job. The tells that survive a visual inspection are dimensional and structural, and they only show up if you measure.

There is a second reason to lead with the channel rather than the product. A counterfeit is not only a bad belt; it is a belt with no traceable batch, so when it fails early you have no route back to the supplier, no material certificate, and no basis for a claim. Checking the channel protects you twice — against the fake, and against the argument afterwards.

Six checks, in the order worth doing them

1. Verify the seller before touching the belt. Ask for the trading entity, the invoice issuer and the batch the goods came from. A seller who cannot name the entity that invoiced the goods, or who supplies a pro-forma from a different company than the one shipping, has given you the most useful signal you will get all day.
2. Measure pitch across ten teeth, not the outside length. Lay the belt flat, mark the centre of one tooth, count ten pitches, and divide the measured span by ten. Compare the result with the pitch code: a T10 belt must measure 10.0 mm per pitch, an 8M belt 8.0 mm. Outside length tells you almost nothing — it varies with tension and with how the belt is lying.
3. Measure width and thickness at three points. A belt that is consistently undersized in width is a different belt, not a worn one. Width also decides how much tooth area carries the load, so an undersized belt fails on capacity before it fails on wear.
4. Compare the tooth profile against a known belt, side by side. Look at the flank angle, the root radius and the tooth top. A recut mould shows up as a blunter tooth top, a tighter root radius, or flash at the parting line. Side-by-side comparison finds this in seconds; a description never does.
5. Cut a used belt and look at the cord. The section is where a counterfeit is hardest to hide: cord spacing should be even, the cord should sit at a consistent depth, and there should be no voids between cord and compound. Uneven spacing or a cord that drifts toward the tooth root predicts early tooth shear, whatever the label says.
6. Cross-check the part number, the batch and the date against each other. The number printed on the belt, the number on the packaging and the number on the invoice should agree, and the batch code should be plausible against the delivery date. Three numbers that disagree is a stronger signal than any single cosmetic detail.

Receiving inspection for a timing belt — action, acceptance criterion, and why the check resists copying

*Source: inspection actions and acceptance criteria follow standard receiving-inspection practice for synchronous belts; pitch values are definitional per ISO 5296 and ISO 13050. Criteria are qualitative — apply the belt manufacturer's published dimensional tolerance to each measurement.*

Three gates on the purchasing side

Inspection catches what arrives. These three decide what arrives in the first place.

• Buy through a channel the manufacturer recognises as authorised. Not "a distributor who says they are authorised" — the manufacturer's own listing. This one step removes most of the risk, and it is also what makes a warranty claim possible later.
• Keep the invoice entity, the batch and the delivery note as one file. If a belt fails at 40 % of expected life, that file is the difference between a claim and a write-off. It also makes the next purchase comparable, because you can see which batch performed.
• Treat an unusual price as a question, not a verdict. A price well below the authorised channel is a reason to ask where the stock came from, not proof of anything. Surplus, end-of-life stock and short-dated inventory are all legitimate and all cheap. The answer you get when you ask is the evidence; the price is only the prompt.

Three ways this goes wrong

• Judging by packaging. The most common error, and the least informative. Cartons, sleeves and labels are printed by the same trade suppliers that serve legitimate brands.
• Judging by price alone. Price is a screening signal, never a conclusion. Cheap and genuine happens; expensive and counterfeit also happens, especially in markets where buyers equate cost with authenticity.
• Checking one dimension and stopping. A counterfeit can hold pitch and still fail on cord lay. The dimensional checks and the section check answer different questions — one is "does it fit", the other is "will it last".

FAQ

Is a cheap Gates belt bought online always counterfeit?

No. Authentic stock reaches the market through surplus, end-of-life inventory and resellers clearing short-dated batches, and those belts are genuinely cheap. Price is a prompt to ask questions, not a finding. Ask for the invoicing entity, the batch code and the delivery note; if the seller cannot produce consistent answers, the price has told you something after all.

What can I do when no authorised channel is available nearby?

Reduce the exposure instead of removing it. Measure pitch, width and thickness against the code; cut one belt from the batch and inspect the cord lay; keep a known-good belt on the shelf for side-by-side profile comparison; and retain the invoice and batch record. That combination catches most bad stock, and it gives you evidence if the batch fails.

What does a counterfeit timing belt look like when it fails?

Typically early and in a pattern — rapid elongation that runs out of take-up range within weeks, uneven tooth wear across the width, or teeth shearing at the root while the backing is intact. None of those is proof of a counterfeit on its own: misalignment produces edge wear, low tension produces ratcheting, and a jammed load produces shear. The counterfeit case is the one where a new belt fails the same way twice and every alignment and tension check passes.

Standards referenced

• ISO 5296 — synchronous belt drives: belt pitch codes and dimensional characteristics (trapezoidal profiles).
• ISO 13050 — synchronous belt drives: metric pitch curvilinear profile systems.
• ISO 254 — belt drives, pulleys: quality, finish and balance requirements, relevant because a worn pulley damages a genuine belt as fast as a counterfeit one.
• Gates' own published product-authentication guidance — where it exists, it is the authoritative source and takes precedence over any general practice described here.

Confirm the current edition of each standard before quoting it. For dimensional acceptance, use the belt manufacturer's published tolerance rather than a figure taken from an article.