A generic factory audit confirms that paperwork exists and that a facility clears a baseline. It rarely catches the signals that matter most to a buyer: a declared scope that doesn’t match the production floor, evidence that is too tidy to be real, and workers who answer like they’ve been rehearsed. Those are judgment calls, not checkboxes — and they are where most sourcing risk hides.
Scope vs. Actual Production
Start by comparing what the factory is legally registered and certified to make against the SKU you are actually buying.
- Business license and certification scope. Check that the registered scope covers your product category, not just “trading” or “hardware.” For regulated goods, confirm the specific certificate covers the model and standard, not a similar product.
- Process map versus floor walk. Ask for the full process flow, then walk it. Every critical step — molding, SMT, final assembly, electrical testing, packing — should map to a physical station with a machine nameplate you can read.
- Subcontracting disclosure. Ask directly which steps leave the building. Get the name of any subcontractor handling a critical process.
Decision criteria: outsourcing is normal and often fine. Undisclosed outsourcing of final assembly, testing, or anything affecting safety is not — treat it as a stop-and-verify item before placing a deposit. Tradeoff: pressing hard on scope can slow onboarding, but discovering a scope mismatch after tooling is paid for is far more expensive.
Overly Clean Evidence
Real factories produce imperfect records: corrections, rework logs, scrap, out-of-date calibration stickers. Perfect records are a warning, not a compliment.
- Sample three to five records across different dates and cross-check them against production logs, shipping documents, or machine counters.
- Ask to see a record from a “bad day” — a defect batch, a customer complaint, a line stoppage. See how it was handled.
- Check handwriting, ink, and paper consistency. Bindles filled in one sitting are usually reconstructed.
Decision criteria: if defect and rework data show zero across several months, treat the quality system as unverified rather than excellent, and ask for the underlying inspection sheets.
Coached Worker Interviews
Workers who glance at a supervisor before answering, use marketing phrasing, or cannot describe their own previous shift are telling you the answers were prepared.
- Interview away from management, in small groups or one-to-one.
- Ask open questions: what did you do yesterday, what happens when a unit fails, who do you tell.
- Ask the worker to walk you through their own station and demonstrate the step.
Next step: if you cannot get an unrehearsed answer, treat the audit as incomplete and schedule a second, unannounced visit — or start a sourcing project with on-the-ground support before committing to production.
Undisclosed Subcontracting
The audit shows a clean, well-organized plant. The order ships from a different one. Subcontracting is normal in Chinese manufacturing, but undisclosed subcontracting is where quality, lead time and compliance quietly break down.
Watch for these signals during the walk-through:
- Separate buildings or gated units on the same site where workers in similar uniforms move between areas
- Language such as “we cooperate with a brother factory” or “that process is done by our partner”
- Critical processes — welding, plating, electronics assembly, sterilization, printing — that happen off-site with no written procedure
- Finished cartons already bearing another buyer’s shipping marks in the same staging area
- An order quantity accepted that clearly exceeds the visible line capacity for your product type
Concrete steps: ask for a process-to-building map for your specific SKU, not a generic company brochure. Walk the perimeter and note adjacent facilities. Compare stated headcount with the number of active workstations you can actually see. Put a subcontractor disclosure clause in your quality agreement that names any approved sub-tier and requires your written approval before substitution.
Decision criteria: disclosed, approved and monitored subcontracting for non-critical steps is often acceptable. Undisclosed outsourcing of a safety-critical or appearance-critical process is a stop-and-renegotiate finding. The tradeoff is real: insisting on full in-house production narrows your supplier pool and can raise unit cost, so prioritize disclosure and sub-tier control over purity.
Capacity vs. Floor Reality
Stated monthly capacity is usually a sales figure. Test it against the floor:
- Count operating shifts and compare with what the factory claims — one shift is rarely three.
- Read machine hour meters or maintenance logs and check them against claimed utilization.
- Ask for the last three months of production records for a comparable SKU, with customer names redacted.
- Check the planning board or ERP screen: are there scheduled orders in your product category, or is your category blank?
- Schedule the visit during their stated peak season, not the quiet month they propose.
Decision criteria: measure against your required monthly volume plus a buffer for rework and peak demand — not against their maximum claim. A factory running at 95% of stated capacity cannot absorb your growth or a rework cycle. Seasonal underloading is legitimate; chronic idle equipment behind a capacity claim is not.
Material Traceability Gaps
Pick a finished unit and walk it backward. Can staff show you the incoming lot, the inspection record and the supplier’s certificate of conformance for that specific lot? Red flags include unlabeled incoming material, certificates filed by supplier rather than by lot, mixed bins in the component store, no quarantine area, and “we buy from the market” for a critical component.
Require lot numbering, incoming inspection records and segregated storage in the purchase order terms. For regulated or safety-critical components, no lot traceability is a stop; for labels and packaging, it is usually a fixable gap with a written corrective action and a re-check.
To scope these checks into a pre-order audit plan, start a project with Yoursender.
Quality Data That Won’t Reconcile
A factory can pass a checklist while its quality records quietly contradict each other. The audit question is not whether inspection reports exist, but whether the numbers agree across documents, dates, and systems.
Ask for the same production lot’s records from four angles: incoming material inspection, in-process checkpoints, final inspection, and the customer complaint log. Then test for consistency.
- Lot traceability: The lot number on the final inspection report should match the lot number on the material receiving record. If they use different numbering schemes, ask how the link is made and who maintains it.
- Defect arithmetic: Sample sizes, defect counts, and acceptance thresholds should add up. Watch for reports where the AQL standard is stated but the recorded sample size does not match that standard.
- Dates and signatures: Handwritten dates that cluster on one day, pre-signed blank forms, or inspection dates that fall on the same day as shipment loading are worth questioning.
- Yield versus rework: Ask for rework logs. A high first-pass yield with no rework record usually means rework is being absorbed elsewhere or not documented.
- Complaint-to-corrective-action loop: Pick one logged complaint and trace it to a root cause, a corrective action, and evidence the fix held.
Decision criteria: Minor gaps in documentation are common and fixable. Treat as serious any pattern where the factory cannot reconstruct a lot’s history, where defect counts change between versions of the same report, or where corrective actions are recorded without verification.
Tradeoff: Pushing for full traceability may reveal that the factory relies on informal verbal handoffs. That is a process risk you can price into your QA plan, but only if you know about it before production starts.
Tooling and IP Blind Spots
Tooling and intellectual property are where audits most often stop at “yes, we have molds.” The useful questions concern ownership, condition, storage, and control.
- Mold ownership evidence: Request the tooling register and match each mold to a purchase record, asset tag, or written ownership agreement. Ask who pays for maintenance, repair, and replacement.
- Tool condition: View the molds in storage, not just on the machine. Look for rust, missing inserts, damaged cavities, and whether molds are identified and protected.
- Access and exclusivity: Confirm whether the same mold or a near-identical design runs for other buyers. Ask how the factory separates your tooling from similar work.
- Design file control: Ask where CAD files, artwork, and specifications are stored, who can access them, and whether they are shared with subcontractors.
- Subcontracting disclosure: Identify which processes are outsourced and whether your files or molds travel to those third parties.
Next step: Put the findings into a written tooling and IP annex to your supply agreement, with a mold condition record and a return clause. If you are preparing an audit scope, start your project with Yoursender to align the audit questions with your product and tooling plan.
Calibration and Maintenance Theater
Generic audits confirm calibration stickers and maintenance logs exist. That is theater unless records trace to the actual instrument, standard, and product risk. Pick two or three critical gauges—not the showroom set—and ask the operator to show instrument ID, current certificate, provider, and reference standard. Red flags include certificates without equipment IDs, stickers reissued in a batch before the audit, “internal calibration” without traceable standards, overdue tools still in use, and maintenance logs that record only breakdowns. Check whether preventive maintenance follows runtime or cycle count, critical spares are on site, and downtime has root-cause review.
Decision criterion: a gap is manageable if it affects a non-critical dimension and the factory shows a dated correction with verification. Treat as a hold point any critical gauge with no traceability, repeated overdue status, or maintenance history not tied to the line.
Gaps to Close Before Commitment
Do not convert findings directly into a purchase order. Classify each gap by product risk, recurrence, and evidence quality. Require a corrective action plan with owner, due date, verification method, and evidence sample. For critical-to-quality gaps, add a pilot run or pre-production hold point. Keep commercial leverage until verification closes. A small factory may outsource calibration or maintenance, but only with traceable certificates, defined schedules, and named responsibility. Walk away from unresolved critical gaps, missing records, or refusal to provide verification.
Practical checklist
- Match instrument ID to certificate, standard, date, and provider.
- Ask the operator to demonstrate daily checks and out-of-calibration response.
- Review preventive maintenance schedule, critical spares, and breakdown root-cause records.
- Confirm corrective-action owners, due dates, evidence, and re-verification method.
- Set hold points for critical gaps before deposit or full production.
FAQs
Are internal calibration records acceptable?
Only with traceable reference standards, trained personnel, and a controlled schedule. Otherwise require external calibration for critical instruments.
How many instruments should I sample?
Pick two or three that control critical dimensions or safety features. Follow each from certificate to the line and operator.
What if maintenance logs are handwritten?
Format matters less than traceability. Look for date, equipment ID, task, parts, technician, and follow-up; consistent handwritten logs can be acceptable.
Should every audit gap block
Planning a product or sourcing project? Discuss your sourcing project with Yoursender.