This page is the quality-control detail behind the OEM and private-label overview: what a sample can and cannot prove, AQL sampling under ISO 2859-1, telling a plant from a trading company, the supplier scorecard, and the audit badges and approved-supplier list that sit underneath them.
Sampling: what a sample proves, and what it cannot
A stock sample ships in three to five business days and tells you three useful things: whether the format suits the use it is for, how the motor feels at the setting a customer will actually use, and whether the noise level is tolerable in a room with thin walls. It cannot tell you whether the batch you receive will match it, because a stock sample comes off a line that has been running.
A custom sample is a different instrument and it is worth being precise about what to demand. The sample must be made on production tooling, not hand-finished from a prototype mould, and it must be accompanied by the first-article measurements for the dimensions that matter to your packaging.
A hand-finished sample is the most common way a first order disappoints: the sample was beautiful because a technician spent two days on it, and the production unit is what a 40-second cycle produces. Ask for a production sample, approve the first article in writing, and keep the approved unit — it is the reference for any dispute later. Two documents make that reference enforceable, and both have to exist before the first production run.
The first is the tech pack: the drawing, the material call-outs, the tolerances, the surface finish and the packing configuration the plant is actually building to, in the plant’s own language rather than yours — and these are the same numbers the retailer draws the planogram from, months later, whether or not you sent them. The second is a change control rule — any deviation from the tech pack, however small and however obviously an improvement, is quoted and approved in writing before it is built. A tech pack nobody signed is a memory, and every “small improvement” that skips the rule is a specification change you will first notice in the third container.
Sample charges are stated separately on the quotation, and a stock sample is credited against the bulk invoice for the same SKU. An open-ended sample charge with no credit is not a red flag by itself, but a supplier who will not separate it from the unit price usually will not separate anything else either.
Quality control: AQL, inspection, and telling a plant from a trading company
The line on every catalogue SKU is the same: incoming inspection on components, in-process checks during assembly, final inspection on every unit, and outgoing inspection before packing, with a stated outgoing defect rate under 0.1% and a twelve-month warranty on business orders. On top of the per-unit line, sampling inspection follows ISO 2859-1, normally at critical 0, major 2.5 and minor 4.0 for consumer goods.
AQL zero on critical means a single safety defect fails the batch, which is the only sensible reading of the standard for a device that goes near the body. The sampling level that sets the sample size is a second decision, separate from the AQL number, and it is the one buyers forget to put in writing: general inspection level II is the working default in ISO 2859-1, level III widens the sample for a first run, and the special levels S-1 to S-4 exist for tests that destroy the unit.
Agree the defect classification sheet before production starts — whether a mark is a critical defect, a major or a minor is your call to make in writing, not the inspector's to make at the carton — because the identical sample passes or fails depending on the class the defect is put in.
An AQL is not a ceiling on the defect rate: it is the quality level a sampling plan is designed to accept most of the time.
A 10,000-unit lot: 200 units sampled, and the acceptance numbers
Ten major defects in a 200-unit sample is an accept: 5% observed passes an AQL of 2.5.
Book a third-party pre-shipment inspection, at your cost, before the goods leave. It is the cheapest insurance in the order and the clearest single signal of what kind of counterparty you have: a plant welcomes it because the report protects them too, and a trading company resists it because the report describes a factory they do not control. What happens once the container is on the water — the MABD date, the OTIF score and the deductions that follow a documentation slip — is set out on retail readiness, and what a repeat order costs in cover and cash is on the second order, and what a delisting costs once the stock is no longer on a shelf is on the delisting arithmetic. Six signals are worth gathering before a first deposit, and they are set out as a figure on our for-brands page — a business licence whose scope matches the product, a live unscripted video walk of the floor, a sample made on production tooling, a batch-level test report, an invoice beneficiary that matches the licence, and an audit above roughly $10,000.
How many checkpoints you buy matters more than which firm you buy them from, because three of them answer three different questions and buyers usually purchase only one. A factory audit before the deposit answers who you are paying and whether this site can make the thing: the entity matching the licence, the equipment and the capacity, whether work is subcontracted, and the last three defect records rather than a quality manual.
A pre-shipment inspection on finished, packed goods answers whether the batch matches the signed golden sample, and it is scheduled at 80–100% completion so rework is still possible. Loading supervision answers what actually crossed the container door, and under which seal. Skipping the first and buying the other two is the standard way to inspect goods made by the wrong supplier. A during-production check at 20% to 50% completion — DUPRO — is the cheap addition that catches a material substitution before it is repeated across the whole run.
Scoring a supplier: seven dimensions, and the weight each one earns
The audit above is a decision; a scorecard is the record you keep. Give every dimension a weight that adds to 100, score each from 0 to 5, and the composite is the sum of score divided by five, times the weight. None of that arithmetic is proprietary. What makes it useful is that the weights are fixed before the quotes arrive, so a persuasive salesperson cannot move them afterwards.
sirenpicks.com/oem/quality/#supplier-scorecard · seven weighted dimensions totalling 100 · this sheet is a snapshot: the live table, and the two worked quotes beneath it, are the reference.
| # | Dimension | What earns a 5 | Weight | What a 1 is telling you |
|---|---|---|---|---|
| 1 | Certificate pack, per destination market | The complete set is in hand and named on the documentation, including the test report for the exact variant | 20 | The pack depends on the order being placed first — which means it will never be shown to you |
| 2 | Final-inspection defect rate | A published rate under 0.1% that a third-party report confirms | 18 | No number exists, so the first batch is the measurement |
| 3 | Delivered against quoted lead time | Ships inside the quoted window on the second and third order, not only the first | 15 | The quote was a sales figure; the real lead time appears after the deposit |
| 4 | Independent pre-shipment inspection | Welcomes it, books the slot, and has done it before | 12 | Resists it, or offers to handle the inspection internally |
| 5 | Tooling ownership and transfer | Ownership, amortisation and transfer price are all stated in the contract | 12 | The mould is the factory’s, and leaving means starting again |
| 6 | Commercial terms | Invoice beneficiary matches the licence, deposit at or below 30%, Net-30 offered from the second order | 13 | Personal account, 100% up front, or a beneficiary in a third name |
| 7 | Response and document turnaround | Answers a technical question in writing within two working days, with the document attached | 10 | Fast on price, silent on specifications |
Two quotes from the same round, scored the same way, usually separate further than the price difference suggests. Supplier A answers within the hour and quotes 8% less. Supplier B takes two days and sends a certificate pack nobody asked for yet. On the seven dimensions A lands at 60.6 and B at 84.2 — and the price advantage A is selling disappears the first time a container has to be reworked.
| Dimension | Weight | A: cheaper, faster | B: slower, documented | A × weight | B × weight |
|---|---|---|---|---|---|
| Certificate pack per market | 20 | 3 | 5 | 12.0 | 20.0 |
| Final-inspection defect rate | 18 | 2 | 4 | 7.2 | 14.4 |
| Delivered against quoted lead time | 15 | 3 | 4 | 9.0 | 12.0 |
| Pre-shipment inspection accepted | 12 | 2 | 5 | 4.8 | 12.0 |
| Tooling ownership and transfer | 12 | 3 | 5 | 7.2 | 12.0 |
| Commercial terms | 13 | 4 | 3 | 10.4 | 7.8 |
| Response and document turnaround | 10 | 5 | 3 | 10.0 | 6.0 |
| Composite, of 100 | 100 | 60.6 | 84.2 |
Three rules keep the scorecard alive past the first order. Score per purchase order rather than once a year, because the second order is where a first order’s promises are actually tested. Hold the weights fixed for at least a year, or the ranking turns into a way of justifying a decision already made. And record the score you actually gave, not the one you would defend in the meeting — a scorecard that flatters every supplier measures nothing. The RFQ checklist that starts the process is on this page: target market, volume band across the first three orders, what you want changed, target landed cost, packaging status, and the documents you already hold.
Two documents decide whether a shortlist survives contact, and neither is the one suppliers lead with. The first is the ISO 9001 scope statement — not the certificate badge, but the line naming which processes at which site were assessed, because a scope that reads “trading of consumer goods” describes a trading company holding a quality certificate.
The second is the social-compliance audit: BSCI (amfori’s Business Social Compliance Initiative) and SEDEX, reported as SMETA, cover labour standards, health and safety, environment and business ethics at one named address, and they are re-audited rather than granted once. Ask for both as PDFs carrying the site address, and read the date. Neither substitutes for a batch-level product test report, which is the document a border or a marketplace actually asks for.
The result belongs in an approved supplier list — the register of vendors audited, qualified and approved for a specific product, with the approval conditional on audit findings and corrective-action deadlines. Without one, approval is a conversation; with one, it is a record a procurement note can cite.
Re-score it per purchase order rather than once a year, because the second order is where a first order’s promises are tested, and a list that is never re-scored is a decoration. Where the product is a first run, book the inspection before shipment and nominate the AQL inspection level in the purchase order rather than leaving it to the factory’s standard — the sample size, and therefore what the inspection can actually detect, is set by that level.
Back to the OEM overview, or on to procurement and compliance.